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

Abstract

The invention discloses a kind of NM300 wear-resistant steel for high-silicon and high-aluminum concrete mixer trucks and a production method, which controls the mass percentage content of each element in the steel and the carbon equivalent of the steel. The desulfurized pre-treated molten iron enters the converter for smelting. The qualified molten steel is continuously cast into steel billets after being treated with LF+RH+calcium. The steel billets are heated to 1150~1300°C in a soaking furnace or heating furnace and then rolled into intermediate billets through rough rolling mills and finish rolling. The final rolling temperature is 820~920℃. The 2.0~5.0mm steel plate after final rolling is cooled in sections by water cooling. The steel plate is cooled to 100~300℃ and then rolled into steel coils. The steel coils with a temperature lower than 70℃ are then cooled. The rolled cover is backfired at a temperature of 150 to 300°C and a holding time of 10 to 30 hours. The rolled steel plate is cross-cut and straightened to a fixed length. Wear-resistant steel plate Rm≥1000MPa, A50≥8%, HBW≥300HB, yield-to-strength ratio ≤0.75, has good wear resistance and processing performance, and the production process is simple. As a lightweight material for concrete mixer trucks, its 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