80mm wear-resistant steel plate with large thickness, high toughness and low alloy, and manufacturing method thereof

Abstract

The invention relates to a 80mm wear-resistant steel plate with large thickness, high toughness and low alloy, and a manufacturing method thereof. The 80mm wear-resistant steel plate with large thickness, high toughness and low alloy is prepared from the components: 0.18 to 0.20 percent of C, 0.20 to 0.40 percent of Si, 0.90 to 1.20 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.002 percent of S, 0.90 to 1.20 percent of Cr, 0.20 to 0.40 percent of Mo, 0.50 to 0.80 percent of Ni, 0.008 to 0.030 percent of Ti, 0.01 to 0.050 percent of Nb, less than or equal to 0.030 percent of V, 0.0008 to 0.0025 percent of B, 0.02 to 0.06 percent of Alt, less than or equal to 0.0040 percent of N, less than or equal to 0.0002 percent of H, and the balance Fe and inevitable impurities. The manufacturing method comprises the steps of carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, stacking castingblanks for slow-cooling, inspecting the casting blanks, judging the casting blanks, checking the casting blanks, heating the casting blanks, dephosphorizing, rolling, air cooling, carrying out flaw detection, shot blasting, quenching, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing. The steel plate obtained through the invention has the surface Brinellhardness being larger than 400HB, the core Brinell hardness being larger than 330HB, and the low-temperature impact energy at minus 40 DEG C being larger than or equal to 20J.

Description

technical field [0001] The invention relates to the field of wear-resistant steel manufacture, and relates to a large-thickness wear-resistant steel plate and a manufacturing method thereof, in particular to an 80mm thick high-toughness low-alloy wear-resistant steel plate and a manufacturing method thereof. Background technique [0002] Low alloy wear-resistant steel is widely used in engineering, mining, construction, agriculture, cement, port, electric power and metallurgy and other mechanical equipment manufacturing under harsh working conditions, such as bulldozers, loaders, excavators, dump trucks, ball mills and various mining machinery , grab bucket, stacker reclaimer, feeding bending structure, etc. Such parts generally work in the extremely harsh environment of dry and wet, and are difficult to replace. The steel plate is required to have high strength, hardness, excellent wear resistance and corrosion resistance, good low temperature toughness and good welding per...

AI Technical Summary

Problems solved by technology

[0003] Low-alloy wear-resistant steel usually has low impact toughness and instability in production, which leads to problems such as easy fracture of the steel plate under impact conditions and poor wear resistance.

At present, there have been many patent reports on low-alloy wear-resistant steel, but there is no substantive report on large-thickness NM400 wear-resistant steel.

Moreover, the hardness and low-temperature toughness of wear-resistant steel are poorly matched, and it is difficult to meet the needs of large-scale, lightweight and long-life manufacturing of equipment manufacturing

[0004] The patent with the publication number CN 101880831 B discloses a high-strength, high-toughness, low-alloy wear-resistant steel and its manufacturing method.

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