High ductility negative 110 degree low-temperature steel and manufacturing method thereof

• Main Authors: TONG MINGWEI, DUAN DONGMING, LIU ZHIMIN, LI JIANHUA, GUO AIMIN, DONG ZHONGBO, LIU JIXIONG, DING QINGFENG, BO YONG, CHEN XIAO, XI TIANHUI, LIU JIBIN
• Format: Patent
• Language: Chinese; English
• Published: 22.06.2011
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to high toughness -110 DEG C low temperature steel and a method for manufacturing the low temperature steel, the steel is composed of components with following weight percent: C 0.02-0.12, Si 0.10-0.35, Mn 0.30-0.80, P<=0.015, S<=0.010, Ni 3.20-3.80, Ti 0.005-0.05a and Al 0.005-0.10, the low temperature steel also comprises two or more than two of Nb<=0.050, V<=0.10, Cu<=2.0, Mo<=0.50, Zr<=0.040 and RE<=0.020, and allowance is Fe. The method for manufacturing comprises: coating anti-oxidation coating on the surface of casting billets and controlling proper technological parameter such as the initial rolling temperature of steel, the controlled rolling accumulated reduction rate, each operation secondary reduction rate for last three operations, the finish rolling temperature, the normalizing heat preservation temperature, the heat preservation time, the tempering heat preservation temperature and the like. The method has the advantages of pure steel quality, stable organization, stable a