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发明公开
CN109136762A 一种半挂车焊接工字梁用钢及其生产方法 无效 - 驳回

一种半挂车焊接工字梁用钢及其生产方法
摘要：
本发明公开了一种半挂车焊接工字梁用钢及其生产方法，所述工字梁用钢的成分质量百分比为C：0.14～0.20wt％，Si：0.10‑0.65wt％，Mn：1.1～1.65wt％，Nb：0.02～0.05wt％，Mo：0.3～0.8wt％，V：0.03～0.15wt％，Ti：0.01～0.04wt％，Al：0.01～0.06wt％，Cr：0.3～1.0wt％，Ni：0.5～1.0wt％，B:0.0015～0.0025wt％，P：≤0.02wt％，S：≤0.01wt％，N：≤0.008wt％，其余为Fe及不可避免的杂质。用以解决现有技术中轻量化半挂车焊接工字梁用钢无法达到强度级别要求，且提高钢的强度级别，则会造成焊接开裂、焊缝疲劳开裂的技术问题，实现了半挂车焊接工字梁用钢具有良好的强韧性、焊接性能和低温冲击韧性，提高了车辆的安全性能，且利于车辆的轻量化发展的技术效果。
摘要（英）：

The invention discloses steel for a welded I-beam of a semi-trailer, and a production method thereof. The steel for the I-beam comprises components in percentage by mass: 0.14-0.20wt% of C, 0.10-0.65wt% of Si, 1.1-1.65wt% of Mn, 0.02-0.05wt% of Nb, 0.3-0.8wt% of Mo, 0.03-0.15wt% of V, 0.01-0.04wt% of Ti, 0.01-0.06wt% of Al, 0.3-1.0wt% of Cr, 0.5-1.0wt% of Ni, 0.0015-0.0025wt% of B, less than or equal to 0.02wt% of P, less than or equal to 0.01wt% of S, less than or equal to 0.008wt% of N, and the balance of Fe and inevitable impurities. The steel and the production method thereof aim to solvethe technical problems in the prior art that steel for the welded I-beam of the lightweight semi-trailer cannot meet strength grade requirements and a higher steel strength grade leads to weld cracking and fatigue weld seam cracking, and have the technical effects that the steel for the welded I-beam of the semi-trailer achieves high toughness, high welding performance and high low-temperature impact toughness, the safety performance of vehicles is improved, and lightweight development of vehicles is facilitated.

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