Hot stamping component and manufacturing method therefor

The hot stamping component with a decarburization, inner oxide, and plating layer configuration addresses the toughness and cost challenges by enhancing the component's strength and formability, preventing cracks and ensuring high tensile strength and bendability.

US20250092485A1Pending Publication Date: 2025-03-20HYUNDAE STEEL CO LTD
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Patent Information

Application Number
US18/965209
Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Priority Date
2022-05-31
Filing Date
2024-12-02
Publication Date
2025-03-20

AI Technical Summary

Technical Problem

Current hot stamping technologies face challenges in enhancing the toughness of ultra-high-strength steel components while maintaining economical feasibility, as increasing alloy components can lead to higher costs and reduced toughness, and existing methods struggle to prevent cracks during the hot stamping process.

Method used

A hot stamping component is developed with a decarburization layer and an inner oxide layer on the surface of a base material, along with a plating layer, which satisfies specific hardness and depth ratios to achieve improved toughness and prevent cracks, while maintaining high tensile strength and formability.

Benefits of technology

The solution effectively enhances the toughness and high-temperature formability of the hot stamping component, preventing cracks and ensuring high tensile strength and bendability, thereby addressing the cost and feasibility issues of existing methods.

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Abstract

A hot stamping component includes: a base material; a decarburization layer located on the base material; and an inner oxide layer located on the decarburization layer, wherein the hot stamping component has a tensile strength (TS) of 1350 MPa to 1680 MPa, and a hardness of the hot stamping component within a depth of 50 μm from a surface of the hot stamping component in a plate thickness direction of the hot stamping component and an average hardness of the hot stamping component satisfy Relational Expression 1.(A / B)≤0.7<Relational⁢ Expression⁢ 1>(In Relational Expression 1, A denotes the hardness (Hv(≤50 μm)) within the depth of 50 μm in the plate thickness direction of the hot stamping component, and B denotes the average hardness (Hv(avg.)) of the hot stamping component.)
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