Ⅰ.Executive Summary & International Standard Mapping
In precision manufacturing and international procurement, relying solely on single-region designations (such as standalone Chinese GB standards) introduces supply chain friction, verification risks, and compliance blind spots. For cold-rolled low-carbon steel strip and sheet inquiries—specifically involving DC03 under DIN EN 10139 (narrow strip) and DIN EN 10140 (dimensional tolerances)—a robust cross-standard mapping strategy is mandatory.
●To establish absolute technical transparency and fulfill global E-E-A-T (Expertise, Authoritativeness, Trustworthiness) criteria, the metallurgical equivalents for the specified items are mapped as follows:
Primary Standard Reference: DIN EN 10139 / DIN EN 10140 (Material Designation: DC03, Material Number: 1.0347)
●International Equivalents:
JIS G 3141: SPCD (Japanese Industrial Standard for Deep Drawing)
ASTM / SAE: SAE 1008 / ASTM A1008 (Cold-Rolled Carbon Steel)
GB Standard Mapping: 08Al / DC03 (per GB/T 5213)
Ⅱ.Comprehensive Chemical Composition Analysis
Material integrity begins at the liquid steel stage. Alloword enforces strict chemical control protocols backed by tier-one Chinese mill partnerships (e.g., Baosteel, Shagang, WISCO) and third-party verification (SGS/TUV).
For DC03 (1.0347 / SPCD), the guaranteed chemical composition ranges are tightly managed to prevent micro-structural defects and ensure predictable cold-forming behavior:
Carbon (C): ≤0.10% (Max)
Manganese (Mn): ≤0.45%(Max)
Phosphorus (P): ≤0.035% (Max)
Sulfur (S): ≤0.035%(Max)
Residual Elements / Deoxidation: Fully killed steel structure, ensuring fine grain size and excellent aging resistance.
Ⅲ.Technical Differentiation: Condition Analysis & Surface Refinement
Referring to the specific inquiry breakdown provided by overseas engineering teams:
DC03 C 290 MB-RL (1.0347) DIN/EN 10139/10140
DC03 C 290 MB (1.0347) DIN/EN 10139/10140
1. Metallurgical State & Temper Hardening (C 290)
Both items share the core mechanical baseline of C 290 temper designation under EN 10139. Through controlled cold work (cold rolling reduction), the material achieves a designated tensile strength range of Rm: 290 – 390 MPa and a yield strength range of Re: 200 – 380 MPa, paired with a controlled Vickers hardness of HV 95 – 125. This specific temper provides the optimal balance between moderate strengthening and sufficient elongation (A80≥18-24%) for secondary stamping and bending operations.
2. The Significance of the "RL" Surface Suffix
While items #1 and #2 represent the exact same chemical grade and mechanical temper, the "-RL" suffix in item #1 denotes a refined surface structure (often corresponding to specialized skin-passed or laser/prep-textured finishes).
●Standard MB Finish: Clean, matte or semi-bright surface suitable for general pressing and standard coating applications.
●RL-Refined Finish: Implies advanced surface topography control designed to optimize lubricant retention during deep drawing, eliminate micro-slip defects, and enhance paint/plating adhesion for high-aesthetic or critical functional components.
Ⅳ. Alloword’s Hardcore Manufacturing & Processing Infrastructure
To achieve the tight dimensional tolerances and flawless surface properties demanded by international procurement directors, Alloword integrates world-class processing machinery:
1.High-Precision 20-High Sendzimir Mills: Equipped with ABB control systems, twin-tier roll assemblies, and advanced Automatic Gauge Control (AGC) systems. This infrastructure allows us to control thickness tolerances down to ±0.002mm, completely eliminating crown variations across the strip width.
2.Continuous Bright Annealing & Hydrogen Furnaces: Utilizing 100% high-purity hydrogen (99.999%) protective atmospheres to guarantee zero surface oxidation, excellent microstructural uniformity, and pristine surface brightness.
3.Precision Slitting & Edge Control: Equipped with high-rigidity slitting lines featuring Japanese hydraulic lock nuts, ensuring burr-free edges, exact slit widths, and superior straightness (camber control ≤0.3mm/m).
4.Export-Grade Protection: Coils are wrapped in multi-layer export-grade VCI (Vapor Corrosion Inhibitor) packaging, moisture-resistant barrier film, and robust outer steel banding to withstand extended ocean freight and humid storage environments.
Ⅴ.Quality Assurance & MTC Traceability
Every shipment dispatched by Alloword is accompanied by an original Mill Test Certificate (MTC) in compliance with EN 10204 3.1. These documents provide fully traceable verification of actual ladle analysis, tensile tests, elongation values, and hardness profiles, offering absolute peace of mind for global quality assurance auditors.
Baoshan District,
Shanghai, China.
