Steel part and method of manufacturing thereof
By setting the steel plate thickness ratio tout/tin≥1.1 in the bending region and d/tin<8.2 at the joint position, the problem of brittle cracking of molten zinc in zinc-plated steel plates during hot stamping manufacturing was solved, and high-quality steel parts manufacturing was achieved.
CN115279507BActive Publication Date: 2026-07-24NIPPON STEEL CORPORATION
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NIPPON STEEL CORPORATION
- Filing Date
- 2021-03-16
- Publication Date
- 2026-07-24
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Figure CN115279507B_ABST
Abstract
A manufacturing method of a steel member (100, 200) includes the steps of: preparing a joint material (50) including steel sheets (51, 52) joined to each other with overlapping, at least one of overlapping surfaces (511, 521) of the steel sheets (51, 52) having a zinc-based plated layer; heating the joint material (50); and forming a joint portion (60) of the steel sheets (51, 52) by hot press working the heated joint material (50) using a die (71, 81) so that the joint portion (60) is disposed in a bending region (A b1 , A b2 ). When a plate thickness of the steel sheet on an outer side in the bending region (A b1 , A b2 ) is set to t out , and a plate thickness of the steel sheet on an inner side is set to t in , t out / t in ≥ 1.1. The joint portion (60) is disposed in a ridge line portion (31, 32), or is disposed in a position near the ridge line portion (31, 32) that satisfies d / t in < 8.2 when a distance from the ridge line portion (31, 32) to the joint portion (60) is set to d.
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