1Raw Material Inspection
- Verify mill test certificates
- Chemical composition analysis
- Mechanical property testing
- Dimension & surface inspection
ZZ Steel · Power Infrastructure
QUALITY CONTROL
From Raw Material to Delivery
At ZZ Steel, quality is not just a process—it is a commitment. We implement strict quality control at every stage of production to ensure our steel structures meet international standards and exceed customer expectations.
Our Quality Control Process
2Material Preparation
- Check cutting dimensions
- Edge quality inspection
- Material traceability identification
3Component Fabrication
- Dimension inspection
- Hole position & diameter check
- Welding fit-up inspection
4Welding Inspection
- Welder qualification verification
- Welding procedure compliance
- Visual inspection (VT)
- NDT inspection (UT/MT/PT)
5Galvanization Inspection
- Zinc coating thickness testing
- Adhesion test
- Surface uniformity inspection
6Pre-assembly Inspection
- Dimension re-check
- Component matching
- Bolt hole alignment check
7Trial Assembly
- Overall dimension verification
- Fit-up and alignment check
- Assembly stability inspection
Quality Assurance
IEC, ASTM, GB, AS/NZS and other international standards.
Accurate and reliable inspection results.
Experienced and certified quality team.
Full traceability from raw material to final product.
Processes continuously optimized for higher quality.
Independent inspection welcomed for transparency.
Certifications
ISOISO 9001
ISOISO 14001
ISOISO 45001
IECIEC
ASTMASTM
GBGB
ENEN
Our Commitment
We are committed to delivering high-quality steel structures that ensure safety, reliability, and long-term performance. Quality is built into every step we take.
Quality builds trust. Trust builds future.Build a stronger project with ZZ Steel.
Share your requirements with our engineering and sales team.