galvanized steel
Looking for trusted galvanized steel plate manufacturers in China? You've come to the right place. As a direct factory with 20 years of structural steel experience, GNEE Steel supplies EN 10346 compliant sheets at factory prices. Our strict quality control processes ensure every batch of DX51D+Z275 galvanized steel plate meets the highest international standards.
Quality control for DX51D+Z275 begins with raw material selection and continues through every production stage to final inspection. We implement a comprehensive quality management system certified to ISO 9001:2015.
Our commitment to quality ensures consistent performance, reliable delivery, and customer satisfaction for projects worldwide.
Galvanized steel plate
Quality Control Process for DX51D+Z275 Production
We follow a rigorous 8-step quality control process for all DX51D+Z275 production.
| Production Stage | Quality Control Measures | Inspection Standards | Acceptance Criteria |
|---|---|---|---|
| Raw Material Inspection | Chemical composition analysis; Mechanical property testing; Surface quality check | EN 10130; EN 10025 | Must meet DX51D base material requirements; No surface defects |
| Hot Rolling | Thickness monitoring (online and offline); Temperature control; Flatness inspection | EN 10346 | Thickness tolerance ±0.05mm; Flatness ≤3mm/m |
| Galvanizing Preparation | Surface cleaning; Pickling quality check; Flux coating inspection | EN 10346 | Complete oxide removal; Uniform flux coating |
| Hot-Dip Galvanizing | Zinc bath temperature control (445-465°C); Immersion time monitoring; Coating thickness measurement | EN 10346; EN ISO 1460 | Zinc coating ≥275g/m²; Uniform distribution |
| Cooling Process | Controlled cooling rate; Temperature monitoring | EN 10346 | No thermal cracking; Proper coating adhesion |
| Finishing | Trimming; Deburring; Surface cleaning | EN 10346 | Clean edges; No sharp corners; Surface free of contaminants |
| Final Inspection | Dimensional checks; Mechanical testing; Coating adhesion testing | EN 10346 | All parameters within specification; 100% surface inspection |
| Packaging | Packaging integrity check; Label verification | GNEE internal standards | Secure packaging; Accurate labeling with grade, size, and batch info |
Key Testing Methods for DX51D+Z275 Quality Verification
We use advanced testing equipment to verify every critical property of DX51D+Z275.
| Test Category | Testing Method | Equipment Used | Acceptance Criteria for DX51D+Z275 |
|---|---|---|---|
| Chemical Composition | Optical Emission Spectroscopy (OES) | OES Analyzer | C≤0.12%, Si≤0.05%, Mn≤0.60%, P≤0.045%, S≤0.045% |
| Mechanical Properties | Tensile Test; Bend Test | Universal Testing Machine | YS≤340MPa, TS=270-410MPa, El≥28%, 180° bend no cracking |
| Coating Quality | Magnetic Induction Method; Adhesion Test | Coating Thickness Gauge; Bending Machine | ≥275g/m² coating weight; No peeling after bend test |
| Corrosion Resistance | Salt Spray Test | Salt Spray Chamber | ≥1000 hours without red rust |
| Dimensional Accuracy | Coordinate Measuring Machine (CMM); Calipers | CMM; Digital Calipers | Thickness ±0.05mm, Width ±2mm, Length ±3mm |
| Surface Quality | Visual Inspection; Surface Roughness Test | Surface Roughness Tester; Magnifying Glass | No rust, blisters, or defects; Ra≤1.5μm |
Galvanized steel sheet testing
International Certifications for DX51D+Z275
Our DX51D+Z275 galvanized steel plate meets major international standards and certifications.
| Certification | Standards Covered | Scope | Benefits for Customers |
|---|---|---|---|
| ISO 9001:2015 | Quality Management System | Entire production process | Consistent quality; Traceable processes |
| EN 10346 | Continuously hot-dip coated steel flat products | Product compliance | Meets European market requirements |
| ASTM A653 | Hot-dip zinc-coated carbon steel sheet | Product compliance | Acceptable for North American projects |
| SGS Certification | Independent third-party testing | Product performance | Verified quality by global inspection authority |
| BV Certification | Product quality and factory audit | Product and process | Recognized by international buyers |
Quality Documentation Provided with Every Shipment
We provide comprehensive documentation to verify quality and facilitate project acceptance.
- Mill Test Certificate (MTC): Details chemical composition, mechanical properties, and coating test results for each batch.
- Certificate of Conformity (CoC): Confirms compliance with specified standards (EN 10346, ASTM A653, etc.).
- Material Safety Data Sheet (MSDS): Provides safety information for handling, storage, and emergency procedures.
- Inspection Report: Documents all quality checks performed during production.
- Packing List: Details shipment contents, including dimensions, quantities, and batch numbers.
The DX51D+Z275 galvanized steel plate from GNEE Steel undergoes rigorous quality control and meets international standards, ensuring reliable performance for your most demanding projects. Our comprehensive certification and documentation provide the quality assurance you need for project success. Contact us today to request samples and detailed quality specifications for DX51D+Z275!
- Available Steel Grade
| Steel grade | Coating | Yield(MPA) | Tensile(MPA) | Elongation(%) |
| DX51D | Z,ZF | -- | 270-500 | 20 |
| DX52D | Z,ZF | 140-300 | 270-420 | 22 |
| DX53D | Z,ZF | 140-260 | 270-380 | 26 |
| DX54D | Z,ZF | 140-220 | 270-350 | 30 |
| S220GD | Z,ZF | 220 | 300 | 18 |
| S250GD | Z,ZF | 250 | 330 | 17 |
| S280GD | Z,ZF | 280 | 360 | 16 |
| S320GD | Z,ZF | 320 | 390 | 15 |
| S350GD | Z,ZF | 350 | 420 | 14 |
| S400GD | Z,ZF | 400 | 470 | -- |
| S450GD | Z,ZF | 450 | 530 | -- |
| S500GD | Z,ZF | 500 | 560 | -- |