Quality Assurance
International certifications, rigorous testing, and transparent documentation ensure every product meets or exceeds US standards.
Our Certifications
ISO 9001:2015
Quality Management System
SGS Certified
Material Testing & Verification
TÜV Inspection
Independent Quality Audits
Material Standards Comparison
Our Q355 structural steel meets or exceeds ASTM A36 and A992 specifications, ensuring full compatibility with US building codes.
| Property | Chinese Standard (Q355) | US Standard (ASTM) | Verdict |
|---|---|---|---|
| Yield Strength | Q355: 355 MPa | A36: 250 MPa / A992: 345 MPa | ✓ Exceeds A36, Matches A992 |
| Tensile Strength | Q355: 490-630 MPa | A36: 400-550 MPa / A992: 450 MPa min | ✓ Superior Performance |
| Carbon Content | Q355: ≤0.24% | A36: ≤0.26% / A992: ≤0.23% | ✓ Comparable Weldability |
| Applications | Structural steel, buildings, bridges | Same applications | ✓ Fully Compatible |
Engineering Note: Q355 steel is widely accepted by US structural engineers and meets requirements for AISC 360 steel construction specifications. All products include mill test reports (MTR) with chemical composition and mechanical properties.
4-Step Quality Control Process
Material Inspection
All raw materials are verified with mill test reports and SGS certification before production begins.
In-Process QC
Dimensional checks, weld inspections, and visual examinations at every production milestone.
Final Inspection
100% inspection of finished products including measurements, surface finish, and functionality tests.
Packaging & Documentation
Professional export packaging with complete quality reports, certifications, and shipping documents.
What You Receive With Every Order
Mill Test Reports (MTR)
Chemical composition and mechanical properties from steel mill
SGS Inspection Certificate
Third-party verification of material quality and dimensions
Quality Inspection Report
Detailed measurements, photos, and test results for your order
Packing List & Photos
Complete documentation of packaging and shipping preparation
Production Progress Photos
Visual updates at key milestones throughout fabrication
Warranty Certificate
12-month warranty against manufacturing defects
Our Quality Guarantee
If any product fails to meet specifications due to manufacturing defects, we will remake it at no cost or provide a full refund. Your satisfaction is our priority.