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发明授权
CN106460121B 软氮化处理用钢板及其制造方法和软氮化处理钢 失效 - 权利终止

软氮化处理用钢板及其制造方法和软氮化处理钢
摘要：
本发明为软氮化处理用钢板，化学组成以质量％计为C：0.02％以上且不足0.07％、Si：0.10％以下、Mn：1.1～1.8％、P：0.05％以下、S：0.01％以下、Al：0.10～0.45％、N：0.01％以下、Ti：0.01～0.10％、Nb：0～0.1％、Mo：0～0.1％、V：0～0.1％、Cr：0～0.2％、余量：Fe和杂质，且满足[Mn+Al≥1.5]，钢板中以析出物的形式存在的Ti、Nb、Mo、V及Cr的总含量以质量％计为不足0.03％，具有铁素体的面积率为80％以上、且距钢板表面50μm位置的铁素体的位错密度为1×1014～1×1016m‑2的金相组织。
摘要（英）：

Provided is a steel sheet for soft-nitriding treatment which has a chemical composition consisting of, in mass%, C: more than or equal to 0.02% and less than 0.07%, Si: less than or equal to 0.10%, Mn: 1.1 to 1.8%, P: less than or equal to 0.05%, S: less than or equal to 0.01%, Al: 0.10 to 0.45%, N: less than or equal to 0.01%, Ti: 0.01 to 0.10%, Nb: 0 to 0.1%, Mo: 0 to 0.1%, V: 0 to 0.1%, Cr: 0 to 0.2%, and the balance: Fe and impurities, satisfies [Mn+Al‰¥1.5], and has a total content of Ti, Nb, Mo, V, and Cr present as precipitates in the steel sheet of less than 0.03% in mass%. The steel sheet for soft-nitriding treatment has a metal structure in which a ferrite area ratio is more than or equal to 80%, and a ferrite dislocation density at a position of 50 µm from a surface of the steel sheet is 1×10 14 to 1×10 16 m -2 .

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