Heavy Wall Seamless Carbon Steel Pipe – S355JR Structural Grade
Product Overview
Heavy-wall seamless structural steel pipe is a high-load bearing material designed for structural and mechanical engineering applications. Built on S355JR high-strength carbon steel with thick uniform wall section, it delivers excellent load-bearing capacity, bending resistance and torsional strength. With no weld seam to create weak points, it provides reliable, consistent performance for critical structural and heavy machinery components.
Why Choose CNB Heavy-Wall Seamless Pipe?
We source heavy-wall seamless pipe from specialized large-diameter seamless mills with strict control of wall thickness uniformity and centricity. Every pipe undergoes full ultrasonic inspection to verify wall thickness consistency and internal soundness. We offer a full range of value-added processing services including custom cutting, end machining and heat treatment to deliver ready-to-use structural components.
Key Specifications
| Item | Specification |
|---|---|
| Product Name | Heavy Wall Seamless Structural Steel Pipe |
| Steel Grade | S355JR / Q355B |
| Manufacturing Process | Hot rolled seamless |
| Outer Diameter Range | 57mm – 630mm |
| Wall Thickness Range | 8mm – 80mm |
| Standard Lengths | 6m – 12m, custom cut to size |
| Surface Condition | Black as-rolled, shot blasted option |
| End Condition | Plain, beveled, machined option |
| Applicable Standards | EN 10210, GB/T 8162, ASTM A53 |
| Minimum Yield Strength | ≥355MPa |
| Testing | Ultrasonic thickness & flaw inspection |
Core Advantages
- Heavy load capacity: Thick uniform wall section provides high bending and compressive strength.
- Seamless integrity: No weld seam ensures consistent strength around the full circumference.
- Good machinability: Suitable for turning, boring, threading and other mechanical processing.
- Wall thickness uniformity: Strict centricity control ensures even load distribution.
- Versatile structural material: Suitable for both static structural and dynamic mechanical applications.
Applications
This heavy-wall seamless pipe is widely used for building structural columns, bridge supports, machinery shafts, hydraulic cylinder barrels, pile foundations, heavy equipment frames, tool holders and general mechanical structural components.
Get a Quotation
We supply heavy-wall seamless pipe in various structural and mechanical grades with custom sizes and processing services. Custom heat treatment and precision machining options are available upon request. Contact our structural materials team for a detailed quotation.
