690MPa-grade low-silicon corrosion-resistant bridge steel and preparation method thereof

• Main Authors: LANG FENGJUN, CHENG PENG, ZOU DEHUI, LI JIANGWEN, PANG TAO, HUANG XIANQIU
• Format: Patent
• Language: Chinese; English
• Published: 19.11.2021
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to the field of bridge steel manufacturing, and particularly relates to 690MPa-grade low-silicon industrial atmosphere corrosion-resistant bridge steel and a preparation method thereof. The bridge steel comprises the following chemical components of, in percentage by mass, less than or equal to 0.10% of C, 0.02%-0.5% of Si, 0.80%-2.00% of Mn, less than or equal to 0.030% of P, less than or equal to 0.005% of S, 0.20%-0.80% of Cr, 0.10%-0.80% of Ni, 0.20%-0.60% of Cu, 0.010%-0.050% of Als and the balance Fe and inevitable impurities. S is controlled to be smaller than or equal to 0.005%, and the corrosion resistance of the steel is guaranteed; the Si element is added, so that the corrosion resistance of the steel material is improved; the mass fraction of Si is 0.02%-0.5%, so that the corrosion resistance deterioration phenomenon of the steel can be avoided, the mass fraction of Cu is controlled, Cu is enriched in gaps, holes and other defects of a rust layer, and the quality of the rust