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140BH Steel High Bake Hardening Auto Outer Panel Steel is an advanced bake-hardening (BH) steel that perfectly resolves the contradiction between "high formability" and "high surface hardness" in automotive exterior panel design. It exhibits excellent ductility during the stamping stage, easily handling extreme forming processes such as body stretching and complex flanging; after painting and baking, its strength is significantly enhanced, giving the car body excellent dent resistance and a solid feel.
| Material Type: | Bake Hardening Steel |
| Corresponding Grade: | 140BH / CR140BH |
| Standard: | Q/ASB 89.1-2018 |
| Mechanical Properties: | Yield Strength 140-200MPa | Tensile Strength 270-340MPa | Elongation ≥36% |
| Core Advantages: | High plasticity-to-hardness ratio, excellent anti-electroplated thinning ability, and increased strength after baking |
| Typical Applications: | Automotive engine hood outer panels, door panels, trunk lids, and other exterior body panels. |
| Element | Content Upper/Lower Limit | Function Analysis |
| Carbon (C) | ≤0.02 | Ultra-low carbon ensures excellent plasticity and weldability |
| Manganese (Mn) | ≤0.50 | Solid solution strengthening to improve the basic strength of the material |
| Phosphorus (P) | ≤0.04 | Solid solution strengthening and improving corrosion resistance |
| Sulfur (S) | ≤0.025 | Control the shape of inclusions and ensure surface quality |
| Aluminum (Al) | ≥0.005 | Deoxidizer, refining grains and improving toughness |
Thickness: 0.5mm - 2.0mm (Thicker sizes available upon request)
Width: 1000mm - 1850mm (1250mm/1500mm are commonly used)
Surface Finish: High-grade finished surface, annealed and smoothed, with protective oil coating
Packaging: Standard export steel strapping, lined with moisture-proof paper, suitable for long-distance sea freight.
Q1: What does "bake hardening" mean in the context of 140BH Steel High Bake Hardening Auto Outer Panel Steel?
A: Bake hardening refers to the phenomenon where, after stamping, steel sheets undergo baking during the coating process (usually around 170°C), resulting in a further increase in yield strength and tensile strength. For 140BH steel, this strength can increase by at least 30 MPa, making the finished parts stronger and more dent-resistant.
Q2: What are the advantages of 140BH Steel High Bake Hardening Auto Outer Panel Steel compared to ordinary low-carbon steel (such as DC04)?
A: The main advantage lies in "post-forming strengthening." While ordinary deep-drawing steels like DC04 have good formability, their strength is relatively low. 140BH, while maintaining formability comparable to or even better than DC04, achieves higher strength in the final part through the bake hardening effect, making it more suitable for automotive exterior panels where surface hardness and dent resistance are required.
Q3: Are there any special storage requirements for 140BH Steel High Bake Hardening Auto Outer Panel Steel?
A: Yes. Because the bake-hardening effect gradually diminishes with prolonged storage time and increased ambient temperature, we recommend that users arrange production and use the goods as soon as possible after receiving them to ensure optimal material performance.
Q4: Is an original manufacturer's material certificate provided?
A: Yes, each batch of 140BH Steel High Bake Hardening Auto Outer Panel Steel is accompanied by an original manufacturer's material certificate (MTC), which contains detailed chemical composition and mechanical property test data, fully complying with relevant standards such as Q/ASB 89.1.
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No. 696, Binhai 12th RoadBinhai Industrial Park, Wenzhou Economic & Technological Development ZoneWenzhou, Zhejiang Province, P.R.China
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