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220BH Bake Hardening Steel High Strength Auto Outer Panel is a special material for automotive outer panels. The naming rules are clear and traceable: "220" represents the lower limit of the yield strength in the supply state of 220MPa, and "BH" is an abbreviation for Bake Hardening, indicating that it has the core characteristic that "after stamping, the strength can be improved by coating and baking at about 170℃".
| Element | Specification | Description |
| C | ≤0.060% | Low carbon formula improves stamping formability and weldability, preventing stamping cracking |
| Mn | ≤0.80% | Optimizes material toughness, balances strength and ductility, suitable for complex bending |
| P | ≤0.080% | Provides moderate solid solution strengthening to enhance basic strength without impairing stamping performance |
| S | ≤0.020% | Strictly controls impurity content, reduces stamping defects and ensures surface quality |
| Alt | ≥0.015% | Refines grains, improves material uniformity and enhances bake hardening effect |
| Property Index | Standard Value (As Supplied) | After Baking (2% Pre strain + 170℃ × 20min) | Automotive Outer Panel Application |
| Yield Strength | 220–270 MPa | ≥255 MPa (increased by 35–80 MPa) | Low yield strength for easy stamping; strong hardening after baking improves dent resistance |
| Tensile Strength | 320–400 MPa | Increased synchronously to meet outer panel rigidity requirements | Ensures impact resistance and deformation resistance of outer panels |
| Elongation (A80) | ≥32% | Maintains good toughness | High elongation prevents cracking and wrinkling during stamping |
| Bake Hardening Value (BH) | ≥35 MPa | – | Core property ensuring qualified strength improvement after baking |
| Anisotropy (R value) | ≥1.5 | – | Improves stamping consistency and avoids surface wrinkling of outer panels |
220BH Bake Hardening Steel High Strength Auto Outer Panels, with their core characteristics of "easy stamping, high strength, and excellent surface finish," are specifically designed for automotive exterior parts production and are widely used in various core exterior panel components for passenger cars and commercial vehicles, specifically as follows:
Door panels: Suitable for various passenger and commercial vehicle door exterior parts. After stamping, the surface is smooth, and after baking, it exhibits strong dent resistance, ensuring both aesthetic appeal and durability.
Hoods: Requires deep drawing. 220BH's low yield strength and high ductility avoid forming defects. Baking enhances strength, ensuring the hood's rigidity and impact resistance.
Fenders and side panels: High demands for complex bending forming. The product's excellent stamping performance ensures consistent forming, and the surface precision meets the requirements for exterior panel painting.
Roofs and trunk lids: Require a defect-free surface and good dent resistance. 220BH's bake-hardening properties meet long-term usage requirements while also contributing to lightweight design.
Q: Why is 220BH bake-hardening steel suitable for automotive exterior panels?
A: Its core advantages are "easy stamping + bake-hardening strengthening." In its supplied state, it has a low yield point, making it easy to form and avoiding stamping defects. After baking, its strength increases by 35-80 MPa, providing strong dent resistance, while also achieving high surface precision, adapting to exterior panel painting requirements, balancing appearance and performance.
Q: What is the bake-hardening value of 220BH bake-hardening steel?
A: The standard bake-hardening value is ≥35 MPa, and in actual use, it can be increased by 35-80 MPa, fully meeting the dent resistance requirements of automotive exterior panels.
Q: What are the commonly used specifications for automotive exterior panels in stock? Can customization be done?
A: Regular stock includes 0.6*1250*C, 0.8*1500*C, 1.0*1300*C, etc. Special thicknesses, widths, and surface structures can be customized according to the customer's exterior panel mold dimensions.
Q: Can you provide testing reports recognized by automotive OEMs?
A: We can provide authoritative third-party testing reports from SGS, BV, and other reputable organizations, as well as material certificates from our companies. Our testing fully complies with automotive industry standards and meets the audit requirements of OEMs.
Q: What are the discounts for bulk purchases? What is the delivery time?
A: Bulk purchases enjoy exclusive discounts; the larger the purchase volume, the higher the discount. Regular in-stock items are shipped the same day; customized specifications have a lead time of 25-90 days, which can be negotiated for expedited processing.
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