Quenching steel plate for engineering machinery with 900MPa-grade yield strength and production method thereof

Abstract

The invention provides a quenching steel plate for engineering machinery with 900MPa-grade yield strength, comprising the following components in percentage by mass: 0.13 to 0.18 percent of C, 1.20 to 1.60 percent of Mn, not more than 0.010 percent of S, not more than 0.020 percent of P, not more than 0.50 percent of Si, not more than 0.50 percent of Cr, not more than 0.50 percent of Ni, 0.30 to 0.60 percent of Mo, not more than 0.003 percent of B, not more than 0.05 percent of V, not more than 0.03 percent of Ti, not more than 0.03 percent of Nb, not less than 0.018 percent of Al and the balance of Fe and other unavoidable impurities; and the mass percentages of all the components in the steel plate also need to satisfy the condition that the value of the carbon equivalent is not more than 0.56 percent. The invention also provides a production method of the quenching steel plate for engineering machinery with 900MPa-grade yield strength. The steel plate has favorably-matched strength and tenacity, and the welding performance of the steel plate can satisfy the construction requirements on steels for manufacturing high-strength welding structures of the engineering machinery; meanwhile, the strength, the tenacity and the plasticity of the provided steel plate are all superior to similar WELDOX900-standard products in foreign countries.

Description

technical field [0001] The invention relates to a quenched and tempered steel plate for construction machinery and a production method thereof, in particular to a quenched and tempered steel plate for construction machinery with a yield strength of 900 MPa and a production method thereof. Background technique [0002] With the rapid development of my country's machinery manufacturing industry, higher and higher requirements are put forward for the strength requirements of construction machinery steel and the toughness and weldability under high-strength conditions. In order to improve production efficiency, reduce mechanical weight and energy consumption, construction machinery manufacturing industry tends to widely use high-strength quenched and tempered steel plates. [0003] There are two main difficulties in the development of existing high-strength weldable structural steels: [0004] 1. Matching of chemical composition [0005] High-strength weldability structural st...

AI Technical Summary

Problems solved by technology

[0008] The existing general high-strength steel plates generally have poor welding performance, or the toughness of the steel plates drops sharply after welding, so that construction machinery breaks at the welding place under the condition of a small load (less than the rated load), which gives Engineering construction brings huge potential safety hazards

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