API 5L Gr.B Seamless Steel Line Pipe for Oil and Gas - 20 Inch
Product Basic Description
Seamless steel tube is a type of steel product with a hollow cross-section and no seams around the circumference. It is manufactured through hot rolling or cold drawing processes, offering superior strength, uniformity, and pressure resistance compared to welded tubes. Due to the absence of welds, seamless tubes exhibit excellent mechanical properties and are widely used in high-pressure, high-temperature, and critical structural applications.
Core advantages of the product:
•High pressure resistance: Integral forming without welding seams eliminates weak points, enabling it to withstand high internal and external pressures, suitable for medium and high-pressure fluid transmission.
•Precision manufacturing: Strict control over dimensional accuracy (diameter, wall thickness) and straightness ensures consistent product quality and strong interchangeability.
•Excellent mechanical properties: Made of high-quality carbon steel, alloy steel, or stainless steel, it possesses high yield strength, tensile strength, and toughness, adapting to complex working conditions.
•Corrosion resistance: The surface can be treated with acid pickling, passivation, galvanizing, or anti-corrosion coating as needed, effectively resisting oxidation and corrosion, and extending service life.
•Economy and durability: High material utilization rate, long service life, and low maintenance cost reduce the overall project investment.
•Versatility: Supports multi-specification customization to meet the special requirements of different industries and working conditions.
Welded Steel Pipe Standards
ASTM A53, ASTM A500, ASTM A795, API 5L, BS1387, BS1139, EN39, EN10219, EN10255, JIS G3444, ISO65, GB/T3091, GB/T13793, etc.
Welded Steel Pipe Steel Grade
According to different application environments, choose the appropriate steel grade.
|
Model (Outer diameter × Wall thickness) |
Material |
Theoretical weight (kg/m) |
Applicable pressure (MPa) |
Applicable scene |
|
Φ25×3 |
20# |
1.76 |
≤10 |
Low-pressure fluid transmission, mechanical parts |
|
Φ50×5 |
Q355B |
5.52 |
≤16 |
Building water supply and drainage, heating pipelines |
|
Φ108×8 |
API 5L X42 |
20.10 |
≤25 |
Oil and gas field surface pipelines, industrial boilers |
|
Φ219×12 |
304 stainless steel |
61.54 |
≤30 |
Chemical medium transmission, food processing equipment |
|
Φ325×16 |
45# |
124.87 |
≤40 |
High-pressure steam pipelines, heavy machinery bases |
|
Φ530×20 |
316L stainless steel |
256.42 |
≤50 |
Marine pipelines, offshore oil platforms |
| ASTMA53,ASTM A500,ASTM A795,API 5L | BS1387,BS1139,EN39,EN10219, EN10255 | JIS G3444 | GB/T3091,GB/T13793 |
| Grade A | S195 | STK290 | Q195 |
| GradeB | S235 | STK400 | Q235 |
| Grade C | S355 | STK500 | Q355 |
Normal sizes
|
Attribute category |
specific parameter |
|
Material standards |
20#, 45#, Q235B, Q355B, 304 stainless steel, 316L stainless steel, API 5L X42/X52, etc. (customizable according to requirements) |
|
Executive standard |
GB/T 8163-2018, GB/T 3087-2018, API 5L, ASTM A53, DIN 2391 |
|
Mechanical property |
Yield strength ≥ 235 MPa (Q235B), ≥ 355 MPa (Q355B), ≥ 205 MPa (20#); Tensile strength 370 - 630 MPa (varies by material) |
|
Section properties |
Outer diameter: 10 mm - 630 mm; Wall thickness: 1.5 mm - 50 mm (customizable for special specifications)vary depending on the specifications |
|
Surface treatment |
Acid pickling passivation, hot-dip galvanizing, painting, anti-corrosion coating, oiled (rust-proof), natural finish |
|
Length range |
6 m - 12 m (standard), customizable up to 24 m (fixed length/non-fixed length optional) |
|
Error range |
Outer diameter tolerance ±0.5%, wall thickness tolerance ±1%, length tolerance ±1% |
|
Outside Diameter |
Thickness |
||||||
|
SCH10 |
SCH40 |
Class A light |
Class B medium |
Class C heavy |
|||
|
DN15 |
1/2" |
21.3mm |
2.11mm |
2.77mm |
2mm |
2.6mm |
|
|
DN20 |
3/4" |
26.7mm |
2.1lmm |
2.87mm |
2.3mm |
2.6mm |
3.2mm |
|
DN25 |
I" |
33.4mm |
2.77mm |
3.38mm |
2.6mm |
3.2mm |
4mm |
|
DN32 |
1-1/4" |
42.2mm |
2.77mm |
3.56mm |
2.6mm |
3.2mm |
4mm |
|
DN40 |
1-1/2" |
48.3mm |
2.77mm |
3.68mm |
2.9mm |
3.2mm |
4mm |
|
DN50 |
2" |
60.3mm |
2.77mm |
3.91mm |
2.9mm |
3.6mm |
4.5mm |
|
DN65 |
2-1/2" |
73mm 76mm |
3.05mm |
5.16mm |
3.2mm |
3.6mm |
4.5mm |
|
DN80 |
3" |
88.9mm |
3.05mm |
5.49mm |
3.2mm |
4mm |
5mm |
|
DN90 |
3-1/2" |
101.6mm |
3.05mm |
5.74mm |
|||
|
DN100 |
4" |
114.3mm |
3.05mm |
6.02mm |
3.6mm |
4.5mm |
5.4mm |
|
DN125 |
5" |
141.3mm |
3.4mm |
6.55mm |
5mm |
5.4mm |
|
|
DN150 |
6" |
168.3mm 165mm |
3.4mm |
7.1lmm |
5mm |
5.4mm |
|
|
DN200 |
8" |
219.1mm |
3.76mm |
8.18mm |
|||
|
DN250 |
10" |
273.1mm |
4.19mm |
9.27mm |
|||
Applications
(1)Construction: Scaffolding, structural support, and fencing.
(2)Oil and Gas: Transmission pipelines for oil, gas, and water.
(3)Mechanical Engineering: Machinery parts and structural components.
(4)Agriculture: Irrigation systems and greenhouse structures.
(5)Automotive: Exhaust systems and chassis components.
(6)Packaging and Shipping
Advantages
(1)Cost-Effective: Lower production costs compared to seamless pipes.
(2)Wide Range of Sizes: Available in various diameters and wall thicknesses.
(3)Versatility: Suitable for multiple industries and applications.
Packaging and Shipping
Standard export packing. The modes of transportation include containerized sea freight, bulk sea freight, air freight, land transportation, and multi-modal transportation.
fAQ
Q: Are you a factory?
A: Yes, we are integrated with industry and trade.
Q: What is the minimum quantity of your order?
A: It depends on the size and number of products.
Q: Can you provide samples?
A: Samples are available, freight payable.
Q: How do you control quality?
A: Mill Test Certification is supplied with shipment, Third Party Inspection is available. and we also get ISO, CE, SGS, TUV, Alibaba Verified.
Q: What are the advantages of your company?
A: We have many professionals, technical personnel, more competitive prices and best after-dales service than other steel companies.
Q: How many countries you already exported?
A: Exported to more than 50 countries mainly from US, Canada, Germany, UK, Kuwait, Turkey, Philippines, Vietnam, Kenya, Ghana, Panama, Colombia, Peru, Chile, etc.