Steel casting GS24Mn6

Abstract

The invention relates to a steel casting GS24Mn6 capable of optimizing the chemical compositions of the steel casting GS24Mn6 by adding trace elements V and Ti and adjusting partial residual elements so as to improve and optimize the comprehensive performance of the steel casting GS24Mn6. The material comprises the following optimized chemical components: smaller than or equal to 0.23 percent of C, 1.50-1.65 percent of Mn, 0.30-0.45 percent of Si, smaller than or equal to 0.015 percent of S, smaller than or equal to 0.020 percent of P, 0.20-0.30 percent of Cr, 0.005-0.01 percent of Ti, 0.10-0.15 percent of Mo and 0.05-0.08 percent of V. The invention has the advantages that the welding performance of the steel casting GS24Mn6 is greatly improved, and the comprehensive performance of the material thereof reaches or even exceeds the requirements of partial low alloyed steel so that the steel casting GS24Mn6 has wide industrial development prospects for substituting high-strength high-toughness steel.

Description

technical field [0001] The invention relates to a GS24Mn6 steel casting that optimizes the chemical composition of GS24Mn6 by adding microalloying elements V and Ti and adjusting some residual elements, so as to improve and optimize the comprehensive performance of the casting, belonging to the field of steel casting manufacturing. Background technique [0002] Characteristics of GS24Mn6 material: From the requirements of mechanical properties, it can be seen that the material requires castings not only to have high strength properties, but also to have high impact properties at low temperatures. However, since the casting is also used for welding, it is required that the casting must have good weldability. [0003] According to the SEW 520 standard, the chemical composition and mechanical properties of GS24Mn6 in quenched and tempered state are as follows: [0004] Chemical Composition-C: 0.20-0.25%, Mn: 1.50-1.80%, Si≤0.60%, S≤0.015%, P≤0.020. [0005] Mechanical propert...

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Problems solved by technology

[0007] Its shortcomings: According to the requirements of the material, we conduct test analysis on the chemical composition and mechanical properties of 10 groups of samples, among which:

[0010] From the results, such composition control can meet the strength requirements of mechanical properties, but it is difficult to meet the requirements of impact toughness; from the results of metallographic analysis, the metallographic structure after quenching and tempering according to the chemical composition is: Pyrosorbite + part of pearlite, the main reason is that due to the high content of carbon and manganese, the growth of austenite grains during heat treatment and heating makes the grains of part of the quenched structure unable to reach the tempered cord after high temperature tempering. The grain size requirements of the celite, resulting in a decrease in the overall impact toughness

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