Confused by different Chinese steel pipe standards? Let’s break down what GB/T 8162 really covers—and how to use it for your structural project.
GB/T 8162-2018 defines seamless steel pipes specifically for structural applications. It sets standards for dimensions, mechanical properties, and manufacturing methods for round, square, and rectangular tubes.
At Yige Steel, we manufacture cold drawn seamless pipes according to GB/T 8162, using high-quality carbon or low alloy steel grades like 20#, Q345, or 45#. Here’s everything you need to know.
What is GB/T 8162?
Not every seamless pipe is meant for pressure—some are made for structure.
GB/T 8162 is China’s national standard for seamless steel pipes used in structural applications—from mechanical parts to steel frameworks and vehicle chassis.
Key features:
- Applicable for round, square, and rectangular seamless steel tubes
- Covers OD from 10.2 mm to 812 mm
- Wall thickness from 1.5 mm to 60 mm
- Focuses on mechanical load-bearing, not pressure piping
Yige Steel supplies GB/T 8162 pipes with cold drawn precision, tight tolerance, and full MTC (Material Test Certificates).
How is GB/T 8162 different from GB/T 8163 or GB/T 3087?
| Standard | Application | Key Feature |
|---|---|---|
| GB/T 8162 | Structure | Load-bearing use, mechanical force |
| GB/T 8163 | Fluid | For transporting oil, water, gas |
| GB/T 3087 | Boiler | Medium-pressure steam boilers, heat exchangers |
If your pipes are used to build, support, or hold mechanical parts, GB/T 8162 is the correct standard.
What grades of steel are used for GB/T 8162 pipes?
Choose the right material for your load and environment.
Common grades available at Yige Steel:
| Grade | Type | Use Case |
|---|---|---|
| 20# | Carbon steel | General construction, moderate strength |
| 45# | Medium carbon | Higher tensile, mechanical components |
| Q345B/D | Low alloy high strength | Structural parts, frames |
| Q355B/D | GB/T 1591 cross-use | Lightweight structures, agriculture |
| Q460D | Export-ready | Engineering & auto parts |
All these grades can be cold drawn and heat-treated to achieve stable mechanical performance.
Why choose cold drawn GB/T 8162 pipes?
Precision, strength, and smaller MOQ make them ideal for structural applications.
At Yige Steel, we specialize in cold drawn seamless tubes, which offer:
- Tight tolerances (OD ±0.1 mm, WT ±0.15 mm)
- Small-batch production starting at 2 tons
- Superior surface finish—no oxide scale or weld seam
- Full inspection: mechanical + chemical + hydro or UT tests
These pipes are widely used in:
- Agricultural frames
- Machinery components
- Automotive axles & shock absorber housings
- Prefab steel construction
- Truck and trailer chassis
When should you specify GB/T 8162 in a project?
Use it when your design calls for strength—not pressure tightness.
Choose GB/T 8162 seamless tubes if:
- The pipe is part of a load-bearing structure
- It connects to welded or bolted assemblies
- You require dimensional precision for fittings or slide-ins
- Your design includes machining or surface treatment
At Yige Steel, we help customers match GB/T 8162 to equivalent EN or ASTM standards, including DIN ST52, ASTM A513 Type 5, and more.
Conclusion
GB/T 8162 sets the standard for structural seamless steel pipes used in construction, machinery, and automotive systems. At Yige Steel, we bring this standard to life with cold drawn precision, small batch flexibility, and full quality assurance.
Let us help you source the right tube for your project—with confidence and reliability.
