ASTM A234 WPB steel pipe fittings

ASTM A 234 WPB is the most common Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service in the world. The material sources could be steel pipe ASTM A106 or steel plate ASTM A285. The main chemical composition and mechanical properties is :

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PRIME STEEL PIPE offers RL-90 degree elbow, RL-45 degree elbow, equal tee, rducing tee, cap, concentric reducer, excentric reducer strictly in accordance with the standard of ASTM A234 WPB. We have exported our quality carbon steel pipe fittings to Singapore, Nigeria, UAE etc.

Do you know the difference between pipe and tube?

1. Pipe indicates larger outside diameter than tube. Pipes accomodate large applications with sizes that range from a half-inch to several feet. Tubes are generally used in applications that rquire smaller diamters. 

2. The wall thickness of pipe is reffered as pipe schedule, while the wall thickness of tube is specified by a guage for thinner thickness and by fractions of an inch or millimeters for thicker thickness. 

3. The tolerance for pipes is looser than tubes comparatively. Therefore, manufacturing tubes requires more process, tests, inspections than pipes which lead to a longer delivery time, higher cost, and also higher market price. 

4. The pressure rating is significant for pipes because pipes are generally used for fluids, gases, and water. However, for tubes, the outside diamters is important for tubes because tubes are mainly used for weapon part, industrial parts, cooler tubes, medical tubes. 

5. The raw material for pipe is carbon steel or low alloy steel, while for tubes, the raw material is mild steel, aluminum, brass, copper, chrome, stainless steel ect.
6. Pipes is allowed to delivered in bundle or bulk, while for tubes, it usually wrapped with wooden box or thin film for each tubes. 

7. About surface finish, pipes need to be painted or coated with anti-corrosion. However, tubes might need sour cleaning or special polish treatment for particular field use. 

8. The order quantity for pipes is larger than tubes. Because pipes is used for long transporting and used in mass quantity. 

9. Pipe ends are usually in plain or beveled, while for tubes are with coupling ends or specially end finish.
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THIRD PARTY INSPCTION

Nowadays, Hunan Prime Steel Pipe Co., Ltd has been granted a number of acceptance certificates issued by several domestic and international institutions. Such as ISO 9001:2008, Bureav Veritas (BV), Societe Generale de Surveillance S.A. (SGS), TUV etc.

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3PE Anti-corrosion coating Production Flow Chart

Polyethylene three layer anti-corrosion coating, know as 3PE coating, is the world advanced anti-corrosion technology. 

3PE coating includes three layers:

1. Epoxy Primer Coating. Directly coated at the pipe surface. The thickness ranges from 60um to 80um. Ensure the overall coating has good adhesion at higher temperatures.
2. Copolymer adhesive. Mian componenet for this layer is polyolefin. The thickness of the adhesive is ranges from 170um to 250um. To make sure the top anti-corrosion coating is adhesived at the primer coating and also the pipe surface.
3. Anti-corrosion Coating (PE). The top layer is extruded polyethylene, the thickness of this lalyer is about 2mm. The total thickness of the 3PE coating is greater than 2.2~2.9mm.

3PE coating combines the excellent porperties of epoxy coating and extrusion coating of polyethylene in two. The interface properties of epoxy coatings and chemical resistance, the mechanical protection characteristics of extruded polyethylene coating combine to significantly improve the total performance of 3PE. Therefore, as buried pipelines external coating, 3PE have the most competitive advantages than other type of external coatng.

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Anti-corrosion Coating for Steel Pipe

Nowadays, anti-corrosion coated steel pipe is widely used in urban underground pipe network for transporting gas, oil, water, etc. Since the pipeline need to be buried in the soil for a quite long time, so it requires water resistance, chemical resistance and other long-term corrosion resistance. Besides, anti-corrosion coated steel pipe should meet a variety of performance to make sure the pipeline could be transport, storage and embedded in the process. For example, the pipeline should meet a specific properties such as impact resistance, abrasion resistance, compressive strength, hardness, corrosion resistance, ductility, elongation strength. The importance of these properties varies by the use of different environments, construction methods and material differences. 

Polyethylene tape coating:

Polyethylene tape is one of the main anti-corrosion mateiral widely used on pipeline. The using temperature ranges from -30 degrees to 70 degrees and it has good impact resistanc, static pressure, water tightness and other properties. The coating process is simple, convenient, affordable, so it is widely accepted by the users. When using polyethylene tape as anti-corrosion coating, the different thickness and different width of the tape is depending on the anti-corrosion requirements and different construction methods. 

Epoxy powder coating:
Epoxy powder caoting is appread in the 1960s, it is applied by electrostatic spraying method. The powder is spraded onto the pre-heated tube surface, and then a dense layer coating formed after the tube cool down. The advantages for this type of coating is have good corrosion resistance, less environmenetal pollution, wide using temperature range ( ranges from 60 degrees to 100 degrees), large tube adhesion, impact resistance, less welding damage, water resistance, electrical insulation etc. While the disadvantages are vulnerable to inquiry, high technical requirements, complex equipment needed. Therefore, it is very difficult to manage the construction filed. Different manufacturers, or even different batches of product performance differences. We advise the purchasers, when they make the desicion, their choice should focus on its mechanical properties and adhesion resistance.

The using time for buried pipeline is critical. So far, PE anti-corrotion coating is considered to be the most advanced coating in the world due to its chemical stability, mechanical resistance, scratch resistance etc.

Seamless Boiler Tube, Seamless Boiler Pipe

It takes an uncompromising level of quality to manufacture pressure tubing and piping. PRIME STEEL PIPE understands the critical end-use applications and maintains the strictest production standards and procedures required to meet the precise ASTM/ASME specifications applied for heat exchangers, condensers and boilers. We offer complete, non-destructive testing equipment to ensure our products consistently meet our customer's specifications and worldwide quality standards.

SEAMLESS BOILER TUBE & PIPE:
OD: 25.4mm ~ 168.3mm, WT: 1mm ~ 50mm, LENGTH: max 22 mtr
ASTM A106, ASTM A179M, ASTM A192M, ASTM A209M, ASTM A210M,
ASTM A213M, ASTM A355M, DIN 17175, JIS G3456, JIS G3461, JIS 3462, EN 10216

 

Different Types of Pipe Surface Finish you need to know

The Type of Pipe Surface Funish

1. 3LPE (three layer polyethylene coating)
It layered with epoxy (green) first, and then applied the second layer of adhesive (white),  in the end finished the coating by polyethylene (black).
The thickness of the 3LPE ranges from 2.0mm to 4.5mm.
  

2. Bare Pipes --- Finish the pipes with no caoting.
  

3. Black Varnished --- Applyed with 1 or 2 layers of black paint.
  

4. Galvanized --- Hot-dipped Galvanized, Electric Galvanized

  

5. Oiled --- Brushed with oil
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Large-diameter LSAW Steel Pipe Production Process

Large-diameter LSAW steel pipe production process mainly explained: 

1. plate probe: used to manufacture large diameter submerged arc welded steel pipe joints straight after entering the production line, the first full-board ultrasonic testing; 

2. Milling: Milling machine through the two-sided edge of the milling plate, so as to meet the requirements of the plate width, the plate sides parallel to the groove shape and degree; 

3. Pre-curved side: the use of pre-bending machine pre-bending plate edge, the edge of the plate has to meet the requirements of curvature; 

4. Forming: in the first half of JCO molding machine after the pre-bending step after several stamped steel, pressed into a "J" shape, and then the other half of the same steel plate bent, pressed into a "C" shape, forming the final opening The "O"-shaped 

5. Pre-welding: make a straight seam welded steel pipe after forming and using gas welding seam (MAG) for continuous welding; 

6. Inside weld: a tandem multi-wire submerged arc welding (up to four wire) on the inside straight seam welded steel pipe; 

7. Outside weld: a tandem multi-wire submerged arc welding on the outside LSAW steel pipe welding; 

8. Ultrasonic testing: inside and outside of the straight seam welded steel pipe weld and weld both sides of the base material 100% inspection; 

9. X ray inspection: 100% weld on the inside and outside of the X-ray industrial TV inspection using image processing system to ensure detection sensitivity; 

10. Expansion:For submerged arc welding and straight seam steel pipe length hole diameter in order to improve the size precision of steel tube, and improve the distribution of stress in steel tube;

11. Hydraulic test: On the hydraulic test machine for steel after expanding by-root test to ensure that the steel pipe to test pressure requirements of the standard, the machine has an automatic recording and storage capabilities;

12. Chamfering: the steel pipe inspection conducted after the end of processing to the pipe end beveling size requirements.

Do you know the Using Advantages of Galvanized Steel Pipes ?

Galvanized Steel Pipes are widely used in many fields, do you know the reason why is so popular?Below is three main using advantages of Galvanized Steel Pipes you might want to know:


1. After being hot-dip galvanized, the pipes of the surface will be protected well. Compared with other type of coating process, deepen the zinc is easier to let the coating covered well.


2. Because the zinc coating has a larger hardness value than steel pipes. After being galvanized, the impact resistance and anti-ware properties of the steel pipes has increased.


3. In general, the zinc layer at the pipe ends will be relatively thicker than other type of coatings. Therefore, it offers better toughness and abrasion resistance to the Galvanized Steel Pipes.

GB/T8162 Seamless Steel Pipe

GB/T8162 seamless steel pipe 

Application: Suitable for general structure, seamless steel pipe for mechanical structure.

Steel Grade:10、20、35、45、16Mn、12CrMo、15CrMo、12Cr1MoV.

Mechanical properties:

Standard	Steel grade	Tensile strength (MPa)	Yield strength (MPa)	Elongation (%)
GB/T8162	10	≥ 335	≥ 205	≥ 24
	20	≥ 390	≥ 245	≥ 20
	35	≥ 510	≥ 305	≥ 17
	45	≥ 590	≥ 335	≥ 14
	16Mn	≥ 490	≥ 325	≥ 21
	12CrMo	≥ 410	≥ 265	≥ 24
	15CrMo	≥ 440	≥ 295	≥ 22
	12Cr1MoV	≥ 490	≥ 245	≥ 22

Chemical compositions:

Standard	Steel grade	Chemical composition
		C	Si	Mn	P、S	Cu	Ni	Mo	Cr
GB/T8162	10	0.07～0.14	0.17～0.37	0.35～0.65	≤0.035	≤0.25	≤0.25	/	≤0.15
	20	0.17～0.24	0.17～0.37	0.35～0.65	≤0.035	≤0.25	≤0.25	/	≤0.25
	35	0.32～0.40	0.17～0.37	0.50～0.80	≤0.035	≤0.25	≤0.25	/	≤0.25
	45	0.42～0.50	0.17～0.37	0.50～0.80	≤0.035	≤0.25	≤0.25	/	≤0.25
	16Mn	0.12～0.20	0.20～0.55	1.20～1.60	≤0.035	≤0.25	≤0.25	/	≤0.25
	12CrMo	0.08～0.15	0.17～0.37	0.40～0.70	≤0.035	≤0.25	≤0.30	0.40～0.55	0.40～0.70
	15CrMo	0.12～0.18	0.17～0.37	0.40～0.70	≤0.035	≤0.25	≤0.30	0.40～0.55	0.80～1.10
	12Cr1MoV	0.08～0.15	0.17～0.37	0.40～0.70	≤0.035	≤0.25	≤0.30	0.25～0.35	0.90～1.20

                  

API 5L X60 Carbon Steel Pipe

API 5L X60 PSL 1 grade designations come from API Spec 5L Specification for Line Pipe. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi). Standard Line Pipe has grade designation A and B. Application: gas, water and oil transportation in both oil and natural gas.

Chemical composition of API 5L X60

Products	C	Si	Mn	P	S	V	Nb	Ti
API 5L X60 seamless steel pipe	≤0.28	≤0.45	≤1.60	≤0.03	≤0.01	≤0.15	≤0.05	≤0.04
API 5L X60 welded steel pipe	≤0.26	≤	≤1.60	≤0.03	≤0.01	≤0.15	≤0.05	≤0.04

Mechanical properties of API 5L X60

Standard	Tensile strength (Mpa)	Yield strength (Mpa)	Elongation (%)
API 5L X60	≥435	≥320	≥28

            

ASTM A355 Seamless Alloy Steel Pipe

Astm a335 standard specication for seamless ferritic alloy-steel pipe for high-temperature service. This specication covers nominal(average) wall seam-less alloy-steel pipe intended for high-temperatureservice.Pipe ordered to this specication shall be suitable for bending,anging(vanstoning),and similar forming operations,and for fusion welding.Selection will depend upon design,service conditions,mechanical properties,andhigh-temperature char-acteristics. 

Chemical Composition  Grade  C  Mn  P  S  Si  Mo  P1  0.10-0.20  0.30-0.80  0.025  0.025  0.10-0.50  0.44-0.65  P2  0.10-0.20  0.30-0.61  0.025  0.025  0.10-0.30  0.44-0.65  P5  0.15max  0.30-0.60  0.025  0.025  0.50max  0.45-0.65  P5b  0.15max  0.30-0.60  0.025  0.025  1.00-2.00  0.45-0.65  P5c  0.12max  0.30-0.60  0.025  0.025  0.50max  0.45-0.65  P9  0.15max  0.30-0.60  0.025  0.025  0.25-1.00  0.90-1.10  P11  0.05-0.15  0.30-0.60  0.025  0.025  0.50-1.00  0.44-0.65  P12  0.05-0.15  0.30-0.61  0.025  0.025  0.50max  0.44-0.65  P15  0.05-0.15  0.30-0.60  0.025  0.025  1.15-1.65  0.44-0.65  P21  0.05-0.15  0.30-0.60  0.025  0.025  0.50max  0.80-1.06  P22  0.05-0.15  0.30-0.60  0.025  0.025  0.50max  0.87-1.13  P23  0.04-0.10  0.10-0.60  0.030max  0.010max  0.50max  0.05-1.30 Mechanical Properties  Mechanical properties  P1,P2  P12  P23  P91  P92,P11  P122  Tensile strength  380  415  510  585  620  620  Yield strength  205  220  400  415  440  400

          

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