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Seamless steel pipes can be divided into: hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, extruded seamless steel pipes, jacking pipes, etc. Seamless steel pipes are manufactured by cold drawing or hot rolling. Compared with welded steel pipes, seamless steel pipes have no welded joints and therefore have higher strength and pressure resistance. This manufacturing method also helps reduce corrosion issues inside the pipes.
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Seamless steel pipes are widely used as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, coal gas, water and certain solid materials. Compared with solid steel materials such as round steel, steel pipes are lighter in weight when the bending and torsional strength is the same, and they are an economical cross-section steel material. It is widely used to manufacture structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames, and steel scaffolding used in construction. Steel pipes are used to make ring parts.
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ASTM A106: This is a common type of seamless carbon steel pipe typically used in high temperature and high pressure applications such as boilers and heat exchangers.
ASTM A53: Seamless and welded carbon steel pipe typically used in general industrial and low-pressure applications such as conveying water, gases, and air.
ASTM A335: Seamless alloy steel pipe, commonly used in high temperature and high pressure applications such as the chemical and petroleum industries.
Wide range of applications: Seamless steel pipes are suitable for a variety of different applications, including oil and gas transportation, chemical industry, electric power, nuclear energy, shipbuilding, automobile manufacturing and construction.
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|
Standard |
Grade |
Chemical Components (%) |
Mechanical Properties |
|||||
|
C |
Si |
Mn |
P |
S |
Tensile Strength (Mpa) |
Yield Strength (Mpa) |
||
|
ASTM A53 |
A |
≤0.25 |
- |
≤0.95 |
≤0.05 |
≤0.06 |
≥330 |
≥205 |
|
B |
≤0.30 |
- |
≤1.2 |
≤0.05 |
≤0.06 |
≥415 |
≥240 |
|
|
ASTM A106 |
A |
≤0.30 |
≥0.10 |
0.29-1.06 |
≤0.035 |
≤0.035 |
≥415 |
≥240 |
|
B |
≤0.35 |
≥0.10 |
0.29-1.06 |
≤0.035 |
≤0.035 |
≥485 |
≥275 |
|
|
ASTM A179 |
A179 |
0.06-0.18 |
- |
0.27-0.63 |
≤0.035 |
≤0.035 |
≥325 |
≥180 |
|
ASTM A192 |
A192 |
0.06-0.18 |
≤0.25 |
0.27-0.63 |
≤0.035 |
≤0.035 |
≥325 |
≥180 |
|
API 5L PSL1 |
A |
0.22 |
- |
0.9 |
0.03 |
0.03 |
≥331 |
≥207 |
|
B |
0.28 |
- |
1.2 |
0.03 |
0.03 |
≥414 |
≥241 |
|
|
X42 |
0.28 |
- |
1.3 |
0.03 |
0.03 |
≥414 |
≥290 |
|
|
X46 |
0.28 |
- |
1.4 |
0.03 |
0.03 |
≥434 |
≥317 |
|
|
API 5L PSL2 |
B |
0.24 |
- |
1.2 |
0.025 |
0.015 |
≥414 |
≥241 |
|
X42 |
0.24 |
- |
1.3 |
0.025 |
0.015 |
≥414 |
≥290 |
|
|
X46 |
0.24 |
- |
1.4 |
0.025 |
0.015 |
≥434 |
≥317 |
|
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|
Pipe types |
Pipe sizes (mm) |
Tolerances |
|
Hot rolled |
OD<50 |
±0.50mm |
|
OD≥50 |
±1% |
|
|
WT<4 |
±12.5% |
|
|
WT 4-20 |
+15%, -12.5% |
|
|
Cold drawn |
OD 6-10 |
±0.20mm |
|
OD 10-30 |
±0.40mm |
|
|
OD 30-50 |
±0.45 |
|
|
OD>50 |
±1% |
|
|
WT≤1 |
±0.15mm |
|
|
WT 1-3 |
+15%, -10% |
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The ordinary carbon steel pipes produced by GNEE are hot-rolled or cold-rolled from high-quality carbon steels such as 10, 20, 30, 35, 45, 16Mn, 5MnV and other low-alloy structural steels, or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steels. 10 and 20 grade low carbon steel seamless pipes are mainly used for fluid transportation pipelines. Medium carbon steel seamless pipes such as 45 and 40Cr are used to manufacture mechanical parts, such as stressed parts of automobiles and tractors. Carbon steel pipes are generally used to ensure strength and crushing tests. Hot-rolled steel pipes are delivered in a hot-rolled or heat-treated state; cold-rolled steel pipes are delivered in a heat-treated state.
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Q. How long is your delivery time?
A. Different products have different delivery time. The products will be delivered as soon as possible on the basis of the quality assurance. Usually the delivery time is within 5 days after we received your deposit.
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Q. How do you guarantee your quality?
A. We have 6 ex-factory inspection procedures. For each batch of products, 25 people participate in the quality inspection during the whole process of material, size, surface treatment, packaging, etc. Ensure that the factory products are 100% qualified.
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Q. Do you provide custom made Products service?
A. Yes, if you have your own design, we can produce according to your specification and drawing.
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