Steel sheet for gas nitriding
By controlling the chemical composition and microstructure of the steel plate, especially the effective grain size difference, and optimizing the hot rolling and pressing processes, the problem of shape change during gas soft nitriding was solved, achieving high performance and low shape change of the steel plate.
CN116670304BActive Publication Date: 2026-06-02NIPPON STEEL CORPORATION
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NIPPON STEEL CORPORATION
- Filing Date
- 2022-02-18
- Publication Date
- 2026-06-02
Smart Images
Figure CN116670304B_ABST
Abstract
The gas nitriding steel sheet has a prescribed chemical composition and metal structure, when a sheet thickness is set to t, a width in a direction orthogonal to a rolling direction, that is, a sheet width is set to w, effective crystal grain sizes are measured at 7 positions at a depth position of t / 4 from a surface and at positions of w / 8, w / 4, 3w / 8, w / 2, 5w / 8, 3w / 4, and 7w / 8 from an end portion in a width direction in the above width direction, an average of the effective crystal grain sizes at the 7 positions, that is, an average effective crystal grain size is 8.0 to 35.0 μm, and a difference between a maximum value and a minimum value of the effective crystal grain sizes at the 7 positions, that is, an effective crystal grain size difference is 10.0 μm or less.
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