发明名称 |
Hot-forging micro-alloyed steel and hot-rolled steel excellent in fracture-splitability and machinability, and component made of hot-forged microalloyed steel |
摘要 |
The invention provides a hot-forging micro-alloyed steel which achieves excellent fracture-splitability and machinability, without impairing productivity or mechanical properties and without the addition of Pb or the like. It also provides a component made of hot-forged micro-alloyed steel. The hot-forging micro-alloyed steel contains, in mass %, C: from 0.35 to 0.60%, Si: 0.50 to 2.50%, Mn: 0.20 to 2.00%, P: 0.010 to 0.150%, S: 0.040 to 0.150%, V: 0.10 to 0.50%, Zr: over 0.0023 to 0.0050%, Ca: 0.0005 to 0.0050% and N: 0.0069 to 0.0200%, Al being limited to less than 0.010%, and a balance substantially of Fe and unavoidable impurities. |
申请公布号 |
US9255314(B2) |
申请公布日期 |
2016.02.09 |
申请号 |
US201414245048 |
申请日期 |
2014.04.04 |
申请人 |
Nippon Steel & Sumitomo Metal Corporation |
发明人 |
Kubota Manabu;Teramoto Shinya |
分类号 |
C22C38/00;C22C38/02;C22C38/34;C22C38/04;C22C38/12;C22C38/14;C22C38/60;F16C7/02;F16C9/04;F16C33/12;C22C38/06;C22C38/24;C22C38/26;C22C38/28 |
主分类号 |
C22C38/00 |
代理机构 |
Kenyon & Kenyon LLP |
代理人 |
Kenyon & Kenyon LLP |
主权项 |
1. A hot-forging micro-alloyed steel excellent in fracture-splitability and machinability comprising, in mass%, C: from 0.35 to 0.60%, Si: 0.50 to 2.50%, Mn: 0.20 to 2.00%, P: 0.010 to 0.150%, S: 0.040 to 0.150%, V: 0.10 to 0.50%, Zr: over 0.0023 to 0.0050%, Ca: 0.0005 to 0.0050% and N: 0.0069 to 0.0200%, Al being limited to less than 0.010%, and a balance substantially of Fe and unavoidable impurities, wherein in ¼ diameter of the hot-forging micro-alloyed steel, a ratio of a number of MnS inclusions having a width of 1 μm or less to a total number of MnS inclusions is greater than 90%, and an average aspect ratio of MnS inclusions is 10 or less. |
地址 |
Tokyo JP |