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发明授权
CN105950971B 一种屈服强度≥960MPa级工程机械用钢及生产方法 有权 转让

一种屈服强度≥960MPa级工程机械用钢及生产方法
摘要：
一种屈服强度≥960MPa级工程机械用钢，其组分及wt%为：C：0.04～0.20%，Si：0.15～0.40%，Mn：1.0～10%，N：0.01～0.08%，Ti：0.010～0.050%，Als：0.01～0.06%，P：≤0.020%，S：≤0.010%，Cr：0.05~3%。生产步骤：冶炼并真空处理；出钢并浇注成坯并加热；进行热轧工艺；冷轧。本发明提出了一种屈服强度≥960MPa，延伸率≥15.0%，‑20℃AKV不低于60J，冲击断口具有韧窝特征，强韧性匹配十分优异的工程用钢；通过在化学成份中添加适配的N来保证钢的强度，取消了较昂贵的Mo、V、Nb等微合金元素的添加；本发明钢轧制工艺简单易行，轧制过程需控冷，也无需进行热处理。
摘要（英）：

Provided is engineering machinery steel with the yield strength being larger than or equal to the 960 MPa grade. The engineering machinery steel comprises the components of, by weight, 0.04%-0.20% of C, 0.15%-0.40% of Si, 1.0%-10% of Mn, 0.01%-0.08% of N, 0.010%-0.050% of Ti, 0.01%-0.06% of Als, 0-0.020% of P, 0-0.010% of S and 0.05%-3% of Cr. Production steps comprise smelting and vacuum treatment, steel tapping, casting for blank forming, heating, a hot rolling process, and cold rolling. The engineering machinery steel provided by the invention is larger than or equal to 960 MPa in yield strength, larger than or equal to 15.0% in elongation, not lower than 60 J in -20 DEG C AKV and very excellent in matching of strength and toughness, and has an impact fracture with a dimple characteristic. Adaptive N is added to the chemical components so as to ensure the strength of the steel, and adding of Mo, V, Nb and other expensive microalloy elements is cancelled. Rolling technology of the engineering machinery steel is simple and easy to operate, cold control is not needed in the rolling process, and heat treatment is not needed as well.

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