nm300 wear-resistant steel for high-silicon and high-alumina concrete mixer truck and production method

Abstract

The invention discloses a NM300 wear-resistant steel for a high-alumina high-silicon concrete mixer truck and a production method of the NM300 wear-resistant steel. Mass percentages of various elements in the steel and the carbon equivalent of the steel are controlled well. Molten iron subjected to desulfuration pretreatment enters a converter for smelting, and molten steel qualified after the smelting is continuously casted into a steel blank after LF+RH+calcium treatment; the steel blank is heated to be 1150-1300 DEG C in a soaking furnace or a heating furnace, and is rolled to be a middle blank through a roughing mill; the final rolling temperature of finish rolling is 820-920 DEG C, a steel plate with the thickness being 2.0-5.0 mm after the finish rolling is subjected to subsection cooling in a water cooling mode to be 100-300 DEG C, and the steel plate is rolled into a steel roll; the steel roll with the temperature being lower than 70 DEG C is subjected to cold rolling cover retreating tempering, wherein the cover retreating temperature is 150-300 DEG C, and the cover retreating heat-preservation time is 10-30 h; and the rolled steel plate is transversely cut and is straightened into a fixed length. According to the obtained abrasion-resisting steel plate, Rm is greater than or equal to 1000 MPa, A50 is greater than or equal to 8%, HBW is greater than or equal to 300 HBand the yield ratio is less than or equal to 0.75. The steel plate has good abrasion resistance and machinability, a production technology is simple, the steel plate can be used as a lightweight material of the concrete mixer truck, and the practical value is obvious.

Description

technical field [0001] The invention relates to a wear-resistant steel and a production method, in particular to NM300 wear-resistant steel for high-silicon and high-alumina concrete mixer trucks with a thickness of 2.0 to 5.0 mm and a surface Brinell hardness HBW greater than or equal to 300HB for engineering machinery vehicles. production method. Background technique [0002] Due to the state's relevant load limit and environmental protection requirements, the requirements for vehicle load, light weight and fuel consumption continue to increase. The "Energy Conservation and New Energy Consumption Limits" (the third phase) standard opinion draft, which requires fuel consumption to be reduced by 15% in 2020 on the basis of 2015, and lightweight will become an inevitable trend in the development of commercial vehicles. In terms of concrete mixer trucks, 520JJ materials have been used to make the tank body and blades of concrete mixer trucks. This material cannot meet the lig...

AI Technical Summary

Problems solved by technology

[0006] According to investigation, at present, there are also units producing NM300 wear-resistant steel at home and abroad, each with its own process or method, but they all have one or more of the following deficiencies: ① A relatively high content of expensive alloy elements is added, and the cost of steel is high

②The process is complicated and the process cost is high

③ Due to the difficulty in controlling the shape of the quenched plate, there are no relevant reports on the production method of wear-resistant steel (plate) with a thickness ≤ 4mm

④ There is no report on the production method of wear-resistant steel that is subjected to the cover back and tempering process after the steel coil is quenched