S275JR S355JR Full Size Welded Steel Pipe For Mechanical Engineering
Main Types
(1) Welding Process:
①Longitudinal Welded Pipe (Straight Seam): The weld runs in a straight line along the length of the pipe. Commonly used for low-pressure applications.
②Spiral Welded Pipe (Helical Seam): The weld spirals around the pipe. It offers higher strength and is often used for oil and gas transmission.
(2) By Application:
①General Welded Pipe: Used for transporting water, gas, and other low-pressure fluids.
②Galvanized Welded Pipe: Coated with zinc to prevent corrosion, used in construction, agriculture, and fencing.
③Stainless Steel Welded Pipe: Resistant to corrosion and high temperatures, used in chemical, food, and pharmaceutical industries.
④Structural Welded Pipe: Used in construction, bridges, and mechanical structures.
Manufacturing Process
(1)Forming: Steel plates or coils are bent into a cylindrical shape using a forming machine.
(2)Welding: The edges are welded together using methods like High-Frequency Induction Welding (HFIW), Submerged Arc Welding (SAW), or Electric Resistance Welding (ERW).
(3)Sizing: The pipe is passed through a sizing mill to achieve the desired diameter and wall thickness.
(4)Heat Treatment: Some pipes undergo heat treatment to improve mechanical properties.
(5)Surface Treatment: Processes like galvanizing, painting, or polishing are applied based on the intended use.
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.
| 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
|
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.