High-Strength Square & Rectangular Steel Pipe – STK400 / STK500 / ASTM A500
Precision Formed. Built to Last.
We supply premium quality square and rectangular steel pipes manufactured according to JIS G3466 (STK400 / STK500) and ASTM A500 standards. Ideal for structural, industrial, and mechanical applications - from building frames to heavy machinery.
Key Features
High Load Capacity – STK500 and ASTM A500 Gr.B/C offer excellent yield and tensile strength.
Accurate Dimensions – Produced by HFW (high frequency welding) and cold forming with tight tolerances and smooth corners.
Excellent Weldability & Workability – Suitable for cutting, drilling, bending, and welding.
Weather & Seismic Resistant – Perfect for steel structures in harsh or earthquake-prone areas.
Main Standards & Grades
| Standard | Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Typical Application |
|---|---|---|---|---|
| JIS G3466 | STK400 | ≥235 | ≥400 | General structures, bracing |
| JIS G3466 | STK500 | ≥325 | ≥500 | Heavy structures, towers, bridges |
| ASTM A500 | Gr.B / Gr.C | ≥315 (B) / ≥345 (C) | ≥400 (B) / ≥425 (C) | Building frames, trusses, columns |
Available Sizes
Outer diameter: 10×10 mm – 600×600 mm
Wall thickness: 0.5 mm – 20 mm
Length: 6m / 12m or cut to order
Typical Applications
Steel workshops, stadiums, transit stations
Crane booms, lighting poles, transmission towers
Truck frames, trailer beams
Storage racks, agricultural machinery parts
Quality Assurance
Every batch is tested by eddy current, tensile test, and dimensional inspection. Certification EN10204 – Type 3.1 or 3.2 available upon request.
Success Case
Stadium Roof Truss in Southeast Asia
An Indonesian construction company used ASTM A500 Gr.B rectangular pipes (200×100×6mm) and STK500 square pipes (150×150×8mm) for a medium-sized stadium roof truss.
Customer Review:
"The pipes offered excellent dimensional accuracy and minimal welding distortion. The STK500 met our high-strength requirements for long-span design, while the ASTM A500's smooth surface saved us significant grinding time. Delivery was on schedule, and all materials passed third-party inspection. We will definitely use these products again for our next bridge project."
- Project Procurement Manager
Factory Address
The East of Chen Da Road, Daqiuzhuang, Jinghai, Tianjin, China
whatsapp Number
0086 18233409873
lucky@tjshenzhoutong.com
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