High-temperature-resistant 400 HB wearproof steel plate and production method thereof

Abstract

The invention relates to a high-temperature-resistant 400 HB wearproof steel plate. The high-temperature-resistant 400 HB wearproof steel plate is prepared from chemical components including 0.15%-0.25% of C, 0.10%-0.40% of Si, 0.8%-1.30% of Mn, 0.010%-0.040% of Nb, 0.030%-0.060% of V, smaller than or equal to 0.010% of Ti, 0.03%-0.06% of Al, smaller than or equal to 0.1% of Ni, smaller than or equal to 0.1% of Cu, 0.10%-0.50% of Cr, 0.50%-1.00% of Mo, 0.001%-0.005% of B, 0.0010%-0.0050% of Ca, smaller than or equal to 0.010% of P, smaller than or equal to 0.0015% of S, smaller than or equal to 0.0015% of O, smaller than or equal to 0.0035% of N, smaller than or equal to 0.0002% of H, larger than or equal to 0.55 or smaller than or equal to 0.65 of the carbon equivalent CEV and the balanceFe and inevitable impurity elements, wherein CEV=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15. In a production process, controlled cooling is carried out after rolling is completed, grains are refined, and fine Martensite lathes are obtained for following offline quenching. High-temperature tempering is adopted after quenching is completed, under the combined effect of Cr / Mo / V precipitates, it is guaranteed that the microstructure of the high-performance performance finished steel plate of the steel plate is uniform tempered sorbite, and the grains are fine; and the size is smaller than or equal to 20 micrometers, fine uniform precipitates are dispersed on a ferrite matrix, and the precipitates are carbide.

Description

technical field [0001] The invention relates to an iron-based alloy wear-resistant steel, which belongs to the technical field of iron-based alloy steel. Background technique [0002] Wear-resistant steel plates are widely used in construction machinery, mining and transportation, road transportation, agricultural production, port power and other industries that require high strength and good wear resistance, such as bulldozers, loaders, excavators, scraper conveyors, Mining dump trucks, etc. Wear-resistant steel is mainly divided into austenitic high manganese steel and low alloy martensitic steel. The hardness of the high Mn steel matrix is ​​not high, but it has the characteristics of impact hardening, which shows excellent wear resistance under high impact conditions; but the carbon content is high, the welding performance is poor, the wear resistance is low under low impact conditions, and the alloy content is high , Continuous casting cannot be used for mass producti...

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Problems solved by technology

Chinese patent CN104451409B adopts the method of on-line sub-temperature quenching to produce 400HB wear-resistant steel, but on-line quenching will inevitably lead to the inhomogeneity of the performance of the steel plate head and tail, and the application of the steel plate has great limitations; Chinese patent CN103233171B has announced a NM400 grade Cracked high-strength wear-resistant steel plate and production method

However, the addition of rare earth elements and W elements increases the cost, and requires certain improvements to the conventional smelting process

The addition of alloy elements in this invention is relatively high, resulting in too high a carbon equivalent; among the 10 examples, the carbon equivalent of Example 4-10 is 0.75-0.94; the carbon equivalent of Example 1-3 is 0.57-0.65, but the Mn content is as high as 1.65-2.00 , it is easy to cause center segregation and produce cutting cracks; the design of high carbon equivalent greatly limits the welding performance of the steel plate; the invention uses Ti / V composite, and the content is high, the maximum content of Ti is 0.08, and the maximum content of V is 0.1, which has exceeded The conventional microalloying range has a certain influence on the toughness of the steel plate. Therefore, this invention does not study the low temperature impact toughness of the wear-resistant steel.

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