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 :

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. 


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.

3PE Anti-corrosion coating Production Flow Chart

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

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.

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:

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.

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

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

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

5. Oiled --- Brushed with oil

Large-diameter LSAW Steel Pipe Production Process

Large-diameter LSAW steel pipe production process mainly explained: 

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

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 gradeTensile 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:
StandardSteel grade                                    Chemical composition
       C      Si      Mn  P、S   Cu    Ni      Mo       Cr
GB/T8162       100.07~0.140.17~0.370.35~0.65≤0.035≤0.25≤0.25       /   ≤0.15
       200.17~0.240.17~0.370.35~0.65≤0.035≤0.25≤0.25       /   ≤0.25
       350.32~0.400.17~0.370.50~0.80≤0.035≤0.25≤0.25       /   ≤0.25
       450.42~0.500.17~0.370.50~0.80≤0.035≤0.25≤0.25       /   ≤0.25
     16Mn0.12~0.200.20~0.551.20~1.60≤0.035≤0.25≤0.25       /   ≤0.25
    12CrMo0.08~0.150.17~0.370.40~0.70≤0.035≤0.25≤0.300.40~0.55   0.40~0.70
    15CrMo0.12~0.180.17~0.370.40~0.70≤0.035≤0.25≤0.300.40~0.55   0.80~1.10
  12Cr1MoV0.08~0.150.17~0.370.40~0.70≤0.035≤0.25≤0.300.25~0.35   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 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 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

StandardOut DiameterTolerance of Pipe EndTolerance of Pipe Body
+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

StandardGradeOut DiameterWall Thickness
API 5LA219.1~457+15%, -12.5%
B508~610+17.5%, -12.5%
X42-X80508~610+19.5%, -8%

 Chemical Analysis & Mechanical Properties

StandardClassGradeChemical Analysis(%)Mechanical Properties(min)(Mpa)
CMnPSTensile StrengthYield Strength
API 5LPSL1B0.261.200.0300.030414241