High-strength steel plate for super-thick 80,000-ton large-scale forging press brackets, and production method thereof

Abstract

The invention discloses a high-strength steel plate for super-thick 80,000-ton large-scale forging press brackets, which comprises the following components in percentage by mass: 0.17 to 0.23 percent of C, 0.15 to 0.40 percent of Si, 1.20 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.40 percent of to 1.00 Ni, less than or equal to 0.25 percent of Cr, 0.03 to 0.05 percent of Nb, less than or equal to 0.10 percent of Cu, 0.010 to 0.040 percent of Al, 0.002 to 0.004 percent of Ti, 0.50 to 0.55 percent of Mo, 0.001 to 0.005 percent of V, and the balance of Fe and inevitable impurities. Molten steel is subjected to electrosmelting, refining of LF refining furnace, vacuum treatment of VD furnace, off-line stacking and slow cooling after throwing, electroslag remelting for preparing steel ingots, low-speed steel burning, rolling, hydrogen expanding annealing, quenching and tempering treatment so as to be made into finished steel plates. The steel plate completely meets the quality requirements of the high-strength steel plate for super-thick 80,000-ton large-scale forging press brackets, is suitable for manufacturing large-scale forging press brackets, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of steel smelting, and in particular relates to a high-strength steel plate for an extra-thick 80,000-ton large die forging press support and a production method thereof. Background technique [0002] The die forging press is the key equipment for manufacturing large aircraft, and the maximum forging tonnage of the die forging press is 80,000 tons. The steel used to manufacture die forging press brackets has strict requirements on internal density, purity, and mechanical properties after quenching and tempering. Good heat treatment mechanical properties, Rp0.2≥450Mpa, Re 600-780Mpa, 0°C AKV≥34J, %50A≥18, grain size≥5, single steel plate flatness≤6mm, so production is extremely difficult. Due to the design composition and production process of the steel plates currently used, the thickness and strength of the finished steel plates cannot meet the requirements of high-strength steel plates for the support of ...

AI Technical Summary

Problems solved by technology

Due to the design composition and production process of the currently used steel plates, the thickness and strength of the finished steel plates cannot meet the requirements of high-strength steel plates for the support of large-scale die forging presses with an extra-thickness of 80,000 tons.

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