Large-thickness Q500GJCD high-strength steel plate for building structure, and manufacturing method thereof

Abstract

The invention relates to a large-thickness Q500GJCD high-strength steel plate for a building structure, and a manufacturing method thereof. The chemical components of the steel plate comprise, by mass, 0.12%-0.17% of C, 0.20%-0.50% of Si, 1.10%-1.60% of Mn, no more than 0.015% of P, no more than 0.005% of S, 0.10%-0.30% of Cr, no more than 0.30% of Mo, 0.10%-0.30% of Ni, no more than 0.30% of Cu, 0.02%-0.04% of Al, 0.020%-0.060% of Nb, 0.01%-0.02% of Ti, no more than 0.20% of V+Nb+Ti, no more than 0.006% of N and unavoidable impurity elements, and the carbon equivalent is no more than 0.46%. The technological process comprises the steps of hot metal pretreatment, converter steel making, LF refining, RH furnace refining, blank casting of a continuous casting machine, blank heating, control rolling of a rolling mill, and Acc cooling and finishing. The steel plate for the building structure, provided by the application, has the advantages of uniform performance, excellent comprehensive performance, short production cycle and low production cost.

Description

technical field [0001] The invention relates to the technical field of special steel metallurgy, in particular to a large-thickness Q500GJC / D high-strength building structural steel plate and a manufacturing method thereof. Background technique [0002] Structural steel GJ used in large-scale construction projects such as high-rise buildings, super high-rise buildings, long-span stadiums, airports, convention centers, and steel structure workshops has strict requirements. It is a special steel grade that is different from other steel grades. The industry's classification of building structural steel is also very specific and clear, and different grades have different uses. [0003] "Steel Plates for Building Structures" (GB / T 19879-2015), which was implemented in November 2016, added several high-strength grades such as Q500GJ, Q550GJ, etc. compared to GB / T 19879-2005. This shows that in recent years, more and more steel plates have been used in high-rise buildings in my co...

AI Technical Summary

Problems solved by technology

Steel plates are used in the production of large-scale equipment in mines and ports. The production cost is high, the production cycle is long, and the delivery status is QT, which limits the use of customers.

The invention of the notification number CN103556074B "a production method of quenched and tempered high-strength Q500E extra-thick steel plate" adopts the production process of billet rolling + quenched and tempered heat treatment to produce Q500E extra-thick steel plate, which belongs to steel for large-scale equipment in mines and ports. High cost, long production cycle, and the delivery status is QT, which limits the use of customers

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