Low-cost large-thickness 370-grade bridge weathering steel and production method thereof

• Main Authors: FENG HAIZHOU, ZANG XIAOMING, QU ZHIGUO, LI WEI, MA XIN, FU KEREN, WEI JIAFU, GUAN YONG, YANG HAIFENG
• Format: Patent
• Language: Chinese; English
• Published: 09.02.2024
• Subjects: ALLOYS; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; 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; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; POWDER METALLURGY; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses low-cost and large-thickness 370-grade bridge weathering resistant steel and a production method thereof. The weathering resistant steel comprises 0.07%-0.11% of C, 0.20%-0.30% of Si, 1.20%-1.30% of Mn, 0.012%-0.020% of P, smaller than or equal to 0.005% of S, 0.015%-0.045% of Als, 0.015%-0.025% of Nb, 0.01%-0.02% of Ti, 0.40%-0.45% of Cr, 0.30%-0.35% of Ni, 0.25%-0.30% of Cu and the balance Fe and impurities. CEV is not more than 0.43%, Pcm is not more than 0.20%, and I is not less than 6.0; the production method is coupled with a clean steel control technology, the heating temperature, the rolling process and the curing water cooling parameters of the steel billet are controlled, and the product is good in weather resistance, does not generate a supercooled structure, has good welding performance and can be used without coating. 本发明公开了一种低成本大厚度370级别桥梁耐候钢及其生产方法，耐候钢包括：C：0.07-0.11%，Si：0.20-0.30%，Mn：1.20-1.30%，P：0.012-0.020%，S≤0.005%，Als：0.015-0.045%，Nb：0.015-0.025%，Ti：0.01-0.02%，Cr：0.40-