High-strength thick steel plate excellent in low temperature toughness at heat affected zone resulting from large heat input welding
    32.
    发明申请
    High-strength thick steel plate excellent in low temperature toughness at heat affected zone resulting from large heat input welding 审中-公开
    热输入焊接导致热影响区低温韧性优异的高强度厚钢板

    公开(公告)号:US20070181223A1

    公开(公告)日:2007-08-09

    申请号:US10594660

    申请日:2005-04-06

    IPC分类号: C22C38/08 C22C38/14

    CPC分类号: C22C38/08

    摘要: The present invention provides a high-strength thick steel plate having a plate thickness of 50 to 80 mm and a tensile strength of 490 to 570 MPa which is able to realize an excellent HAZ toughness even when welding with a heat input of 20 to 100 kJ/mm is conducted and is characterized by containing, by wt %, 0.03-0.14% of C, 0.30% or less of Si, 0.8-2.0% of Mn, 0.02% or less of P, 0.005% or less of S, 0.8-4.0% of Ni, 0.003-0.040% of Nb, 0.001-0.040% of Al, 0.0010-0.0100% of N, and 0.005-0.030% of Ti, where Ni and Mn satisfy equation [1], and the balance of iron and unavoidable impurities: Ni/Mn≧10×Ceq−3 (0.36

    摘要翻译: 本发明提供一种厚度为50〜80mm,拉伸强度为490〜570MPa的高强度厚钢板,即使在20〜100kJ的热输入下进行焊接,也能够实现优异的HAZ韧性 / mm,其特征在于,含有C:0.03-0.14%,0.30%以下的Si,0.8〜2.0%的Mn,0.02%以下的P,0.005%以下的S,0.8 -4.0%的Ni,0.003-0.040%的Nb,0.001-0.040%的Al,0.0010-0.0100%的N和0.005-0.030%的Ti,其中Ni和Mn满足等式[1],其余的铁 和不可避免的杂质:<?in-line-formula description =“In-line formula”end =“lead”?> Ni / Mn> = 10xCeq-3(0.36