Order--SSAW Steel Pipe to Melbourne

Product: SSAW Steel Pipe

Standard: API 5L GR.B

Specification: 406.4X6.35X12000  406.4X9.53X12000

Surface: BARE

Ends: BE

Quantity: 36TONS

Production Time: 15 DAYS

Destination: Melbourne

Sales Expert: Landry Liu

Production Technology of SSAW Steel Pipe

SSAW steel pipe (some people call it spiral welded pipe) is also a kind of welded pipe, its strength is generally higher than the LSAW steel pipe. Spiral welded pipe with large diameter can be produced by the narrow blank, and SSAW steel pipe with different diameter can also be produced by the same width of blank. However, compared with the same length of the straight pipe, the weld length increased by 30 to 100%, and the production rate is low. Therefore, the smaller diameter of the pipe mostly use LSAW steel pipe, large diameter welded pipe mostly use spiral welded pipe.

The production process of SSAW steel pipe

SSAW steel pipe is the steel pipe with spiral seam that using the strip coil as raw material, extrusion forming under normal temperature, and using automatic double wire double-sided submerged arc welding process to weld.

1.Raw materials are coil, wire, flux. Those must finish the rigorous physical and chemical testing before putting into.
2.The head and tail of strip steel butt joint, use single or double wire submerged arc welding, and use automatic submerged arc welding to repair welding after rolled into steel pipe.
3.Before forming, the strip will go through the leveling, cutting edge, planing edge, surface cleaning and delivery to the edge of the treatment.
4.Using electrical contact pressure gauge control the pressure of the cylinder on both sides of the conveyor to ensure the smooth delivery of the strip.
5.Use external control or internal control roll forming.
6.Use weld gap control device to ensure that the weld gap to meet the welding requirements, diameter, misalignment and weld gap are strictly controlled.
7.Welding and external welding all use American Lincoln welding machine to single or double wire submerged arc weld, in order to obtain a stable welding specifications.
8.The welding line after welding must go through on-line continuous ultrasonic automatic injury inspection to ensure that 100% of the spiral weld non-destructive testing coverage. If there are defects, automatic alarm and spray marking, production workers adjust the process parameters at any time, eliminate of defects timely.
9.Use air plasma cutting machine to cut a single pipe.
10.After cutting into a single steel pipe, the first three of each batch of steel pipe must be carried out a strict first inspection system, to check the weld mechanical properties, chemical composition, melting conditions, steel pipe surface quality and after nondestructive testing to ensure that the pipe process qualified, so it can be put into formal production.
11.There are parts marked by ontinuous acoustic flaw on the seam, after manual ultrasound and X-ray review, if there are defects, after repair, again after the nondestructive test until the defect has been confirmed to eliminate.
12.The butt welds and helical welds of strip steel where the junction of the Ding-type joints, all through the X-ray TV or film inspection.
13.Each pipe must go through the hydrostatic test, the pressure using radial seal. Test pressure and time by the steel pipe hydraulic microcomputer detection device strictly controlled. Test parameters are automatically printed.
14.Pipe end machining, so that the vertical face, bevel angle and blunt edge to be accurately controlled.

The Principle of Submerged Arc Welding

Submerged arc welding (SAW) is a method that burning under flux layer to weld. SAW is one of the most occurring arc welding process. It needs a electrode which may be solid of tubular. The electrode should be used in a continuous approach. It should be fed continuously.Flux refers to a material that can thaw the formed slag and gas when welding, and has the protection and metallurgical treatment to melt metals.The wire is the material that as a filler metal or as a conductive wire for welding.

Submerged arc welding is commonly used to manufacture LSAW steel pipe and SSAW steel pipe, and those two kinds of steel pipe are widely used in various kinds of production and transportation activities. The main feature of submerged arc welding is that the weld and the arc area is protected from environmental contamination by the application of a granular flux which is fusible. The weld pool is protected by a blanket of flux. So that area is actually submerged under that flux. When temperature rises and molten the flux becomes conductive. And thus this creates a path for electron flow between electrode and workpiece. SAW or Submerged Arc welding can be done by manual procedure or automatic process. But it can be done by semi-automatic process where welding gun is hold by hand.

How to Increase the Stability of the SSAW Steel Pipe?

After the production of SSAW steel pipe, it should be stored.If we don’t do some measures to keep its stability, it will rust and be corroded. So we will talk about how to increase the stability of the spiral welded pipe today. Generally speaking, we have followed methods:

1. Small and medium-sized steel, wire rod, rebar, steel pipe with medium diameter, wire and wire rope, etc., can be stored in well-ventilated shed, but must put covering in the upper part of the goods and underlay at the bottom of the goods.

2. Some small steel shape, sheet steel, steel strip, silicon steel sheet, small diameter or thin-walled steel pipe, all kinds of cold-rolled or cold-drawn steel and the metal products with high prices and easy-to-corrode can be stored in warehouse.

3. The ground or warehouse to store spiral steel pipe should choose the place where is orderly and clean, and it is easy to fluently drain away water. It should stay away from the factories and mines that products harmful gases or dust. We also need to remove the weeds and all debris to keep the steel clean on the ground.

4. Large-scale structural steel, steel rail, large diameter steel pipe, forgings, etc. can be opened stack.

5. In the warehouse, SSAW steel pipe should not be stacked with the acid, alkali, salt, cement and other materials that have corrodibility on steel together. Different varieties of steel should be stacked separately, to prevent confusion and prevent contact corrosion.

Submerged Arc Welding Process of SSAW Steel Pipe

SSAW steel pipe refers to the metal pipe with spiral seam that using submerged arc welding process to weld. There are complete production line of SSAW steel pipe in Prime Steel Pipe, we are positioned as a steel pipe manufacturer and exporter for spiral welded pipe. If there is a need, please contact us without hesitation, we will do our best to meet your requirement.

Submerged arc welding (including submerged arc welding and electroslag welding, etc.), its full name is submerged automatic arc welding, it is a kind of method that arc burns under the flux layer to weld. Its inherent advantages (including stable welding quality, high welding productivity, no arc and few dust, etc.) makes it become the main welding methods used in pressure vessel, pipe section manufacturing, box beam and other important steel structure production.

Advantages of SSAW steel pipe:

1. High production efficiency. On the one hand, the wire length is shortened, the current and current density are improved, therefore, the penetration depth of the arc and the deposition efficiency of the welding wire are greatly improved. Generally, single-sided melting depth of can be up to 20mm if do not open the groove. On the other hand, due to thermal insulation of flux and slag, the arc basically has no loss of heat radiation, welding spatter is also few. Although the heat loss for melting the flux is increased, the overall thermal efficiency is still greatly increased.
2. High quality of weld seam. The protective effect of the slag from the air is good, the welding parameters can be stabilized by automatic adjustment, the requirement of the welder's technical level of is not high, the composition of weld seam is stable and the mechanical performance is better.
3. Good working conditions. In addition to reducing the labor intensity of manual welding operations, it does not have arc radiation, which is the unique advantage of submerged arc welding.

Disadvantages of SSAW steel pipe:

The flexibility of submerged arc welding is not as good as manual welding, it is generally only suitable for the weld seam that in horizontal position or small gradient. Workpiece edge preparation and assembly quality requirements are higher, which is cost more working time. Due to using submerged arc welding, we can not see the bath and weld formation process, so the welding specification must be strictly controlled.

Material and Standard Classification of SSAW Steel Pipe

Material of SSAW steel pipe:

SSAW steel pipe (also called spiral welded pipe) is the steel pipe with spiral seam that using strip coil as raw material, extrusion forming under normal temperature, and welding by automatic Double wire double-sided submerged arc welding process. The material of it includes: Q235A, Q23b, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, Q345, L245(B), L290(X42), L320(X46), L485(X70), L555(X80).

Standard classification of SSAW steel pipe:

1. Spiral welded pipe (SY5036-83) used for pressurized fluid transportation is mainly used for conveying oil and natural gas pipeline.
2. Spiral seam high-frequency welded steel pipe (SY5038-83) used for pressurized fluid transportation, it is welded with high-frequency welding method. The loading capacity of it is powerful, the plastic is good, and it is easy to weld and machine shaping.
3. Spiral welded pipe (SY5037-83) used for general low-pressure fluid transmission, it is welded with double-sided automatic submerged arc welding method or one-side welding method, it is mainly used for water, gas, air and steam and other general low-pressure fluid delivery.

Now general standards for SSAW steel pipe is generally divided into: SY/T5037-2000 (ministerial standard, also known as spiral submerged arc welded steel pipe for ordinary fluid transportation pipeline), GB/T9711.1-1997 (Chinese standard, also known as pipe for oil and gas industry transportation, API-5L (American Petroleum Institute, also known as pipeline steel pipe; which is divided into PSL1 and PSL2), SY/T5040-92 (spiral seam submerged arc welded pipe for pile).

Prime Steel Pipe as a excellent manufacturer and exporter of steel pipe, will provide the spiral welded pipe with highest quality and the most comprehensive service for our customer. If you are interested in our products, you can click the hyper-link to view details.

What is Welded Steel Pipe?

Welded steel pipe, also known as welded pipe, is the steel pipe that made of steel plate or steel strip after crimped and welded. The production process of welded steel pipe is simple, production efficiency is high, variety specifications are many, the investment of equipment is little, but its general strength is lower than the seamless steel pipe. Since the 1930s, with the rapid development of high-quality strip continuous rolling line and the improvement of welding and inspection technology, the quality of welding line has been increasing continuously, and the specifications of welded steel pipes have been increasing. And welded pipe have replaced the seamless steel pipe in more and more field. Sewing steel pipe. The welded steel pipe is divided into straight seam welded pipe(also called LSAW steel pipe) and spiral welded pipe(also called SSAW steel pipe) according to the form of welding line.

Production process of LSAW steel pipe is simple, production efficiency is high, cost is low, and it develops rapidly. The strength of the SSAW steel pipe is generally higher than that of the LSAW steel pipe, and the SSAW steel pipe with larger diameter can be produced with the narrow billet. And it also can use the billet with the same width to produce t SSAW steel pipe with different diameter. However, compared with the straight seam welded pipe in identical length, the length of welding line increased by 30 to 100%, and the production rate was low.

Therefore, pipe manufacturers usually use straight seam welding to produce the smaller diameter of the pipe, use spiral welding to produce large diameter welded pipe.

Anti-corrosion Technology of Spiral Welded Pipe

We all know that the individual quality of spiral welded pipe is relatively large, so it must be stacked outdoors. But it is difficult to avoid being exposed to the sun and rain. So the rust problem has been puzzled the storage time and conditions of spiral welded pipe. Today, we need to carry out a comprehensive solution to the knowledge of anti-corrosion technology of spiral welded pipe.

The toolrust-removal of spiral welded pipe mainly uses steel wire brush and other tools to polish the steel surface, and then cleans and preheats the spiral welded pipe, which can remove loose or turnup mill scale, rust, welding slag and so on. Using manual tool to remove rust can reach Sa 2 level, using power tools can reach Sa 3 level. If there is steady oxide-scale adhering to the steel pipe surface, the effect of toolrust-removal is not ideal, it can not up to the depth of abrasion pattern that required by anti-corrosion construction.

Pickling refers to use solvents, emulsions to clean the surface of the spiral welded pipe (SSAW steel pipe) delivered by low pressure fluid, to achieve removing of oil, grease, dirt, lubricants, and similar organic matter, but it can not remove the rust, mill scale, welding flux, etc. on the surface of spiral welded pipe. So Pickling can only as an auxiliary mean in the anti-corrosion production. Manufacturer general use chemical and electrolytic two methods for pickling treatment, pipeline anti-corrosion technology only adopts chemical pickling, that can remove mill scale, rust, the old coating. And sometimes it can be used as re-treatment after derusting by sandblast. Although Chemical cleaning can make the surface to achieve a certain degree of cleanliness and roughness, but its anchor is shallow, and it is easy to cause stacking environment pollution of spiral pipe welding.

Reasonable using the means to clean the rusty pipe can ensure that spiral welded pipe serves the production for a long time and create more production efficiency.

Characteristics of Spiral Welded Pipe Production

Several days ago, we shared the introduction of spiral welded pipe (also called SSAW steel pipe), now, let us continue to understand characteristics of spiral welded pipe production.

Characteristics of spiral welded pipe production includes:

(1)Manufacturers can use the same width of the strip steel to produce a variety of diameter steel pipe;

(2)The flatness of pipe is good, the size of it is more accurate, the spiral weld inside and outside increases the rigidity of pipe body, so the production process of SSAW steel pipe doesn't need sizing and straightening process after welding;

(3)Easy to achieve mechanization, automation and continuous production;

(4)Compared to other equipments those have similar size, it has a small size, small footprint and investment, and fast construction;

(5)Compared with the same size of the straight seam welded pipe, the weld seam per unit length of tube stock is comparatively long, which makes spiral welded pipe production has lower productivity.

The Introduction of Spiral Steel Pipe

Spiral steel pipe, also called SSAW steel pipe or spiral welded spiral pipe, are made by hot rolled strip, it is made by extrusion forming under the normal temperature, and then welded by taking the technology of double wire and double-faced submerged-arc.

During molding process of spiral welded steel pipe, steel plate has uniform deformation and light residual stress, thus the surface has no scratches. Spiral steel pipe has more flexible thicknesses and diameters, especially in making high-grade thick pipes with small or medium aperture, these techniques has incomparable advantages in satisfying your needs.

Spiral steel pipe can be widely used in the production of large diameter spiral tubes for the following reasons:

1) as long as changing the forming angle, we can use the same width of the strip steel to produce a variety of caliber spiral pipe;
2) Since spiral welded steel pipe is formed by the continuous bending, the specified lengths of spiral steel pipe is not limited;
3) The weld in a spiral shape evenly distributed throughout the circumference of spiral steel pipe, so the dimensional accuracy of spiral pipe is high, and its strength is also high;
4) Spiral steel pipe is easy to change the size, so it is suitable for small batch and multi-species production.

Common Defect Detection Method of Spiral Pipe

SSAW common defects magnetic particle testing or penetration testing. Spiral pipe magnetic particle testing or penetrant testing can be effectively found that surface cracks, folding, re-skin surface defects, hairline, pinholes. For ferromagnetic materials, magnetic particle testing method should be given priority, because of its high detection sensitivity; for non-ferromagnetic material, such as stainless steel spiral pipe, is used penetrant inspection method.

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Online austenitic steel spiral pipe, when the insulation is damaged or rain may have infiltrated the site, note that penetration testing to find stress corrosion cracking or pitting and other defects. However, magnetic particle or penetrant testing only on the outer surface of the pipe to detect internal defects in the surface of the powerless. The inner surface of the detector, especially crack type defect detection must be carried out by ultrasonic testing.

When the spiral pipe ends aside less resection margin, due to structural reasons detection device, spiral pipe ends head sometimes can not be effectively detected, and the end is the most likely site of the presence of cracks or other defects. If the spiral steel pipe ends there is potential for cracking tendency, weld heat affected during installation may also make potential crack. Therefore, it should be noted that after the detection of certain welded spiral steel area, to detect extended spiral steel tip defects.

Size Deviation of SSAW Steel Pipe

Size deviation mainly in the SSAW steel pipe is straightness, roundness, aspects of uneven thickness.

In most cases, straightness tolerance for the use of spiral steel pipe under large, but the manufacturing standards for spiral pipe straightness requests, if the predetermined value is exceeded, would constitute a reason to return, and therefore, spiral pipe plant should still be noted.

Roundness tolerance will affect the use of spiral steel pipe, mainly in the group of the wrong side of the welding head. Roundness tolerance has led to the wrong side of the welded joint will not only reduce the pressure capability, but also stress concentration. When the site Group, roundness some pipe can be corrected. Outside diameter deviation and the impact on the spiral steel pipe used roundness tolerance fairly.

Non-uniform wall thickness generally easy to be ignored, and many spiral steel pipe standards are not clearly defined. If the wall thickness Uneven, it will not only result set to the wrong side of the joint, but also the secondary deformation processing (such as steel pipe manufacturing pipe) adversely affected.

Lamination Defect Control Measures of Spiral Steel Pipe

Lamination defect control measures of spiral steel pipe is following below:

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1, to improve the toughness of plastic tube
Improve the cleanliness of molten steel, to reduce the harmful inclusions; increase the proportion of the slab crystal axis, to reduce the center segregation and center porosity; the use of reasonable cooling system to avoid cracks occur within the slab; billet or rolling slab to be taken offline slow cooling process, reduce internal stress, thus ensuring the microstructure and mechanical properties of the finished tube and pipe meet the technical standards.

2, the reasonable control of the heating temperature
By measuring the thermoplastic curve, choose the best heating temperature. Note also that there is enough heating tube holding time, in order to reduce and improve plastic deformation resistance and toughness.

3, lower roll speed
Roll speed is a key parameter piercing process, the roll speed from low to high variations in the process, there is a critical stratification began the roll speed. Lower roll speed, easy to form tube bore; higher roll speed, tube and capillary easily form a layered defects. In order to eliminate delamination defects and capillary tube, roll speed should be reduced to the beginning of the critical delamination roll speed or less.

Corrosion Insulation Performance of Spiral Steel Pipe

Anti-corrosion insulation pipe with corrosion resistance of steel, and has good insulation properties, has been widely used and promoted in building construction, and constantly improve and spread. Corrosion pipe insulation having different processing types and methods, different processing method to determine the pipe have different properties and functions, and the use range also changes. As the name suggests, it is to increase the number of external spiral steel pipe corrosion insulation class protection, in order to achieve low temperature can be used. In general, the use of second degree pipe insulation inorganic zinc-rich paint, which temperature ≥400 ℃, belonging to corrosion coating, conduit port is used polyethylene film called 3-layer PE or using cold sealing tapes to achieve the previously installed to prevent moisture entering into the water or construction.

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Spiral steel pipe insulation for high temperature, water and fuel pumps, chemical pump corrosive. Insulation pipeline centrifugal pump series products with low noise, performance, energy efficient and reliable. The insulation material used is a multi-layer bandaging wrong seam, so it is effective to reduce the heat loss, but also able to control the jacket surface measures to prevent the generation of cold bridges, so that the outer coating of temperature control is guaranteed. Spiral steel pipe wrapped with insulation material multilayer reflective layer of aluminum foil, which can effectively reduce the loss of heat, and can make the steam pipe can be more economical and reasonable. Anti-corrosion steel pipe insulation is a good corrosion resistance, along with good insulation properties, has been widely used and promoted in the design and construction, the current and constantly perfected and popularized. Spiral steel also have different types and methods of processing, while the different processing method to determine the pipe have different properties and functions, and range will change!

Order---SSAW Steel Pipe shipped to Nigeria

Product: SSAW steel pipe, Spiral Submerged Arc Welded, Carbon Steel
Standard: API 5L PSL1 GR.B
Specification: 1000mm*20mm*29.2meters
Surface: 3PE anti-corrosion coated
Ends: Plain End
Quantity: 896 Tons
Production Time: 35 days
Destination: Nigeria info@primesteeltube.com

 

Order---SSAW Steel Pipe with 3PE coating shipped to Saudi Arabia

Product: SSAW Steel Pipe, Submerged Arc Welded, Carbon Steel Pipe
Standard: API 5L X52
Specification:
508mm*7.92mm*1200mm
610mm*6.4mm*1200mm
1067mm*9.35mm*1200mm
1219mm*7.92mm*1200mm
Surface: 3PE anti-corrosive Coating (2mm coating thicnkness)
Ends: Bevelled Ends
Quantity: 1228 Tons
Destination: Saudi Arabia

For more finished SSAW Steel Pipe order, please read Order---SSAW Steel Pipe shipped to Nigeria

  

  

What is API 5L Line Pipe?

LINE PIPE:

Line Pipe is one of the transportation method used for transporting oil, natural gas and water through pipeline to the oil and gas industry. 

Line Pipe Type: Seamless Steel Pipe, Welded Steel Pipes
Line Pipe Ends Type: Plain Ends, Threaded Ends, Socket Ends
Line Pipe Connection Type: Welding Connection, Coupling Connection, Socket Connection
API 5L Line Pipe Steel Grade: GR.B, X42, X52, X60, X65, X70, L245, L290, L320, L360, L450, L485
API 5L Line Pipe Specification: 

                                             
 -Seamless Steel Pipe Specification: Outside Diameter: 10.3mm ~ 1016mm, Wall Thickness: 1.7mm ~ 52mm;
                                             
- ERW Steel Pipe Specification:  Outside Diameter: 21.3mm ~ 660mm, Wall Thickness: 1mm ~ 20mm;
                                            
- LSAW Steel Pipe Specification: Outside Diameter: 406mm ~ 1626mm, Wall Thickness: 6.0mm ~ 75mm;
                                             
- SSAW Steel Pipe Specification: Outside Diameter: 219mm ~ 4060mm, Wall Thickness: 3.2mm ~ 40mm;

   

API 5L LINE PIPE STANDARD:

ISO 3183 / API 5L Line Pipe Standard is one of the most significant international standards in the oil and gas pipeline industry. Nowadays, API 5L Line Pipe Standard is widely applied all over
the world. Jointly completed by ISO and American Petroleum Institution, the 44th Edition ISO 3187:2007 / API Spec 5L Line Pipe Standard has caused widespread impact internationally. The revision was launched in April 2010, collected and processed more than 400 comments all over the world. At the end of 2012, the edition API 5L Line Pipe Standard was formally approved,
and it was formally released on February 18, 2013. Compared with the previous edition, ISO 3183:2012 / API Spec 5L Line Pipe (45 edition) has added two technical appendices which are
Appendix M: European Onshore Natural Gas Pipeline PSL2 Steel Pipe Order and Appendix P: Threaded and Coupled Calculation Formula, Guide Bending and Charpy Impact Calculation
Background. Besides, in the new edition of API 5L Line Pipe Standard, there are few technological changes such as manufacturing processes, performance indicators, test methods.
The new API 5L Line Pipe Standard is more perfect and science after a lot of editorial changes and textual representation of adjustment. 

API 5L LINE PIPE PSL1 & PSL2:

API 5L Line Pipe Standard has put forward specific requirements on the manufacturing of seamless and welded steel pipe including two steel pipe specification level (PSL1 and PSL2). API 5L
Line Pipe is widely used for petroleum and natural gas industry pipeline transportation systems, but this API 5L Line Pipe criterion is not suitable for the cast iron pipe. PSL is the abbreviation
of Product Specification Level which is the quality level of API 5L Line Pipe. API 5L Line Pipe has two standards which are PSL1 and PSL2. Although these two standard only have one word
difference, the content is very different. PSL2 is a higher quality level than PSL1. Both standard level have different levels of inspection requirements, chemical composition requirements,
mechanical properties requirements, mechanical properties requirements. When making order follow the API 5L Line Pipe Standard, the purchaser need to indicate the level of standard
(PSL1 or PSL2) regard of the basic contract terms such as product specification, steel grades, order quantity etc. In general condition, if the contracts do not mention the standard level,
the manufacturer will produce in accordance with the standard of PSL1. To be more specify, the differences are including:

        1. Pipeline Hydro-static Test should be done piece by piece, and the API 5L Line Pipe Standard does not specify to allow non-destructive alternative hydro-static testing.
        2. Impact performance test is necessary for PSL2 standard, while PSL1 is not necessary for this type of test.         3. Non-destructive Test should be applied for PSL 2 standard pipe piece by piece, while for PSL1 standard is not required. 

API 5L Line Pipe Standard is similar to the Chinese Standard GB/T9711. API 5L Line Pipe PSL1 is equivalent to the GB/T9711.1. Compared with API 5L Line Pipe PLS1, API 5L Line Pipe
PSL2 standard level requires more impact energy experiments, so the production time and production cost for the manufacturers will increase. Besides, API 5L Line Pipe PSL2 standard
requires a higher quality level of raw materials for producing steel pipes, the raw materials ordering time will be longer than the PSL1 standard steel pipe raw materials. Moreover, in order
the reach the quality standard of PSL2 and also control the production cost of the factory, the manufacturer will set up a higher level of minimum order quantity for the purchasers. For
API 5L Line Pipe PSL2, some time purchasers will request for following NACE standard which means during the production the manufacturers have to add hardness and acid resistance test
for the pipes to reach a even higher quality level of steel pipes. 

Tolerance of Outside Diameter

Standard	Out Diameter	Tolerance of Pipe End	Tolerance of Pipe Body
API 5L	219.1～273.1	+1.6mm, -0.4mm	±0.75%
	274.0～320	+2.4mm, -0.8mm	±0.75%
	323.9～457	+2.4mm, -0.8mm	±0.75%
	508	+2.4mm, -0.8mm	±0.75%
	559～610	+2.4mm, -0.8mm	±0.75%

Tolerance of Wall Thickness

Standard	Grade	Out Diameter	Wall Thickness
API 5L	A	219.1～457	+15%, -12.5%
	B	508～610	+17.5%, -12.5%
	X42-X80	508～610	+19.5%, -8%

 Chemical Analysis & Mechanical Properties

Standard	Class	Grade	Chemical Analysis(%)				Mechanical Properties(min)(Mpa)
			C	Mn	P	S	Tensile Strength	Yield Strength
API 5L	PSL1	B	0.26	1.20	0.030	0.030	414	241
		X42	0.26	1.30	0.030	0.030	414	290
		X46	0.26	1.40	0.030	0.030	434	317
		X52	0.26	1.40	0.030	0.030	455	359
		X56	0.26	1.40	0.030	0.030	490	386
		X60	0.26	1.40	0.030	0.030	517	414
		X65	0.26	1.45	0.030	0.030	531	448
		X70	0.26	1.65	0.030	0.030	565	483
	PSL2	B	0.22	1.20	0.025	0.015	414	241
		X42	0.22	1.30	0.025	0.015	414	290
		X46	0.22	1.40	0.025	0.015	434	317
		X52	0.22	1.40	0.025	0.015	455	359
		X56	0.22	1.40	0.025	0.015	490	386
		X60	0.22	1.40	0.025	0.015	517	414
		X65	0.22	1.45	0.025	0.015	531	448
		X70	0.22	1.65	0.025	0.015	565	483
		X80	0.22	1.85	0.025	0.015	621	552