NEWS
An international automotive components manufacturer visited GNEE Steel to qualify DX51D galvanized steel coil for precision stamping applications. Read about the audit process and successful material certification. Request a material sample for your stamping trials.
Sourcing galvanized steel for critical automotive components requires utmost precision. A renowned Tier-1 automotive parts supplier from North America recently conducted a stringent qualification audit at GNEE Steel's manufacturing base. The focus was to certify our DX51D galvanized steel coil for use in stamping non-exposed structural parts within vehicle assemblies.
- GNEE Steel: Your Partner for Precision Steel Materials
As an ISO 9001 certified DX51D galvanized steel coil manufacturer, GNEE Steel serves demanding industries where material consistency directly impacts production efficiency and part integrity. Our factory is equipped to meet the tight tolerances and specific property ranges required by the automotive supply chain.
Galvanized steel coil
The client's audit team, comprising materials engineers and sourcing specialists, followed a VDA 6.3 process-based approach. The visit structure was meticulous:
- Day 1 - System Audit: Review of quality management documentation, raw material traceability, and process control records.
- Day 2 - Process Audit & Sampling: On-floor verification of the galvanizing line parameters and collection of coil samples from a running production batch for their own lab testing.
A major discussion point was ensuring the DX51D galvanized steel coil met their stamping requirements. Our technical team presented data to confirm suitability:
- Key Stamping Performance Indicators for DX51D
| Property | Importance for Stamping | GNEE DX51D Coil Performance |
|---|---|---|
| Yield Strength (Re) | Lower yield enables easier forming with less springback. | Controlled within 160-220 MPa range. |
| Elongation (A80) | Higher elongation allows for more severe deformation without cracking. | Guaranteed ≥ 24%, typical 26-30%. |
| Plastic Strain Ratio (r-value)* | Higher r-value indicates better deep drawing ability. | Typical r90 ≥ 1.3 (monitored per heat). |
| Coating Adherence | Coating must not flake off during bending or stretching. | Passes bend test (d=a, 180°) per EN ISO 20482. |
| Surface Quality | Minimizes die wear and ensures part surface finish. | Minimized spangle (M) or smooth (S) finish offered. |
| Data shared upon request for specific batches. |
After successful off-site testing of the samples-which confirmed consistent mechanical properties and excellent coating adhesion-the client formally approved GNEE as a qualified supplier. The subsequent agreement includes:
Supply of DX51D galvanized steel coil in specific widths and thicknesses for their blanking lines.
Implementation of enhanced statistical process control (SPC) chart sharing for key parameters.
A framework for co-developing material specifications for future components.
The successful qualification by a leading automotive supplier validates GNEE Steel's capability to produce DX51D galvanized steel coil that meets stringent industrial standards. Interested in qualifying our material for your stamping or forming application? Contact us to arrange a sample shipment and begin your evaluation process.
- 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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