galvanized steel coil
Procuring DX51D galvanized steel coil for critical projects demands guaranteed quality, consistency, and full traceability. GNEE Steel, an ISO 9001 certified manufacturer, understands this necessity is non-negotiable. This article outlines our rigorous, multi-stage quality control procedures and the essential certifications that accompany every batch of our DX51D galvanized steel coil, ensuring you receive material that meets exacting international and project-specific standards.
Galvanized steel coil
Galvanized steel, such as DX51D galvanized steel coil, is valued for its protective zinc coating and consistent formability. The DX51D grade, per EN 10346, is specified for its reliable mechanical properties. It serves demanding industries from construction to appliance manufacturing where consistent quality, batch-to-batch uniformity, and documented proof are imperative. Other grades in the family offer specialized properties for more demanding forming.
We are not just a supplier; we are a certified producer with an integrated quality management system. GNEE Steel's factory operates under ISO 9001:2015, ensuring process control and continuous improvement. Every batch of DX51D galvanized steel coil is produced with documented procedures and is fully eligible for independent third-party inspection (SGS, BV, TUV, Lloyd's) to provide you with utmost confidence and facilitate smooth project approvals.
Comprehensive In-Process Quality Checks for DX51D Coil
Our quality control for DX51D galvanized steel coil is integrated throughout the entire production workflow, not just a final check.
- Quality Control Process Flow & Checkpoints
| Production Stage | Key Control Parameters | Test Method / Equipment | Frequency |
|---|---|---|---|
| 1. Incoming Substrate | Chemistry, thickness, width, surface defects | Spectrometer, Laser Gauge, Visual Inspection | Per coil / per heat |
| 2. Pre-Treatment | Cleaning efficiency, surface activation | Water break test | Continuous |
| 3. Galvanizing Bath | Zinc bath temperature, chemistry (Al, Pb, etc.) | Thermocouples, Bath sampling | Hourly / per shift |
| 4. Coating Control | Coating weight (both sides), uniformity | X-ray Fluorescence (XRF) Gauge | Continuous |
| 5. Post-Treatment | Passivation layer weight (if applied) | Coating weight difference | Per lot |
| 6. Final Inspection | Mech. properties, coating adherence, dimensions | Tensile tester, Bend test, Micrometer | Per coil / per lot |
Essential Documentation and Certifications Package
When you order DX51D galvanized steel coil from GNEE, you receive a complete documentation package for compliance and record-keeping:
Mill Test Certificate (MTC 3.1 / EN 10204): Provides heat number, chemical analysis, mechanical test results, and coating weight tests.
Certificate of Origin
Commercial Invoice & Packing List
Third-Party Inspection Report: Available upon request from major international agencies.
Detailed Parameters Verified in Our Mill Test Certificate
Our MTC is a comprehensive quality passport. Here's an example of the data provided:
- Sample MTC Data Table for DX51D+Z180
| Test Item | Standard Method | Specification Requirement | Test Result (Example) | Status |
|---|---|---|---|---|
| Chemical Composition (%) | ||||
| Carbon (C) | ISO 4934 | ≤ 0.12 | 0.08 | PASS |
| Manganese (Mn) | ISO 4935 | ≤ 0.60 | 0.35 | PASS |
| Phosphorus (P) | ISO 4937 | ≤ 0.045 | 0.020 | PASS |
| Sulfur (S) | ISO 4938 | ≤ 0.045 | 0.015 | PASS |
| Mechanical Properties | ||||
| Yield Strength (Re) MPa | ISO 6892-1 | ≥ 140 | 185 | PASS |
| Tensile Strength (Rm) MPa | ISO 6892-1 | 270 - 500 | 320 | PASS |
| Elongation (A80mm) % | ISO 6892-1 | ≥ 22 | 26 | PASS |
| Coating Properties | ||||
| Coating Weight (Total) g/m² | ISO 1460 | 180 (Z180) | 195 | PASS |
| Coating Adherence (Bend d=a) | EN ISO 20482 | No peeling | No peeling | PASS |
| Surface Finish | Visual | Minimized Spangle (M) | Minimized Spangle | PASS |
- Source Certified DX51D Galvanized Steel Coil with Confidence
Quality and traceability should never be a question mark. GNEE Steel provides fully certified DX51D galvanized steel coil with transparent, detailed, and traceable quality documentation that meets global project standards. Download a sample Mill Test Certificate for our DX51D galvanized steel coil and see the verifiable proof of our commitment to quality.
- Available Steel Grade
|
Standard |
Grade |
C |
Si |
Mn |
P |
S |
Ti |
|
Forcold Forming Chinese Standard |
DX51D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
DX52D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
DX53D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
DX54D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
DX56D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
DX57D+Z |
0.12 |
0.50 |
0.60 |
0.100 |
0.045 |
0.30 |
|
|
Forcold Forming Japanese Standard |
SGCC |
0.15 |
0.50 |
0.80 |
0.050 |
0.030 |
0.025 |
|
SGCD1 |
0.12 |
0.50 |
0.60 |
0.040 |
0.030 |
0.025 |
|
|
SGCD3 |
0.08 |
0.50 |
0.45 |
0.030 |
0.030 |
0.025 |
|
|
SGCD4 |
0.06 |
0.50 |
0.45 |
0.030 |
0.030 |
0.025 |
|
|
For Structure Japanese Standard |
SGC340 |
0.25 |
0.50 |
1.70 |
0.200 |
0.035 |
0.025 |
|
SGC400 |
0.25 |
0.50 |
1.70 |
0.200 |
0.035 |
0.150 |
|
|
SGC490 |
0.30 |
0.50 |
2.00 |
0.200 |
0.035 |
0.025 |
|
|
SGC510 |
0.30 |
0.50 |
2.50 |
0.200 |
0.035 |
0.025 |
|
|
For Structure AISI Standard |
S220GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.025 |
|
S250GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.025 |
|
|
S280GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.025 |
|
|
S320GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.025 |
|
|
S350GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.150 |
|
|
S550GD+Z |
0.20 |
0.60 |
0.70 |
0.100 |
0.045 |
0.150 |
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