High-strength, high-toughness and corrosion resistant mooring chain steel and its production process


Application Number: 00109053
Application Date: 2000.06.02
Publication Number: 1281906
Publication Date: 2001.01.31
Priority Information:
International: C22C38/48
Applicant(s) Name: Jiangyin Xingcheng Iron & Steel Co. Ltd.
Address:
Inventor(s) Name: Zhang Weiji;Zhu Yiming;Li Guozhong
Patent Agency Code: 11230
Patent Agent: zhang ejun
Abstract The present invention relates to a high-strength, high-toughness and corrosion-resisting steel for mooring chain and its production process. Said steel contains (wt%) C 0.25%-0.33%, Si 0.15%-0.30%, Mn 1.45%-1.75%, Cr 0.90%-1.40%, Ni 1.00%-1.20%, Mo 0.45%-0.65%, Nb 0.02%-0.06%, Al 0.020%-0.05%, residual and harmful elements: P is less than or equal to 0.020%, S is less than or equal to 0.015%, Cu is less than or equal to 0.20%, Sn is less than or equal to 0.03%, Sb is less than or equal to 0.01%, As is less then or equal to 0.04%, B is less than or equal to 0.005%, [N] is less than or equal to 0.009%, [O] is less than or equal to 0.0020%, [H] is less than or equal to 0.0002% and the rest is Fe. At the same time the carbon equivalent must be greeter than 1.40. Said steel produced by adopting EAF+LF+VD+CCM process can be used as R4-level morring chain for semi-submerged well drilling platform, single-point mooring structure, floating tanker and other marine installation.