A kind of 80mm large-thickness high-toughness low-alloy wear-resistant steel plate and its manufacturing method

Abstract

The present invention is a kind of 80mm large thickness high toughness low alloy wear-resistant steel plate and its manufacturing method. S≤0.002%, Cr0.90‑1.20%, Mo0.20‑0.40%, Ni0.50‑0.80%, Ti0.008‑0.030%, Nb0.01‑0.050%, V≤0.030%, B0.0008‑0.0025 %, Alt: 0.02‑0.06%, N≤0.0040%, H≤0.0002%, and the rest are Fe and unavoidable impurities. Manufacturing methods include: hot metal desulfurization pretreatment-converter smelting-LF+RH refining-continuous casting-slab stacking slow cooling-slab inspection-slab judgment-slab acceptance-slab heating-phosphorus removal-rolling-air cooling ‑Flaw detection‑Shot blasting‑Quenching‑Tempering‑Straightening‑Cutting, sampling‑Spray printing marks‑Inspection‑Storage. According to the invention, the surface Brinell hardness of the steel plate is greater than 400HB, the core part Brinell hardness is greater than 330HB, and the low-temperature impact energy at -40°C is greater 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...

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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 CN101880831B discloses a high-strength, high-toughness, low-alloy wear-resistant steel and its manufacturing method. Reasonable performance is obtained through reasonable composition design and sub-temperature quenching treatment, but the production thickness announced by the patent is 6 -60mm, its Brinell hardness is above 330HB, the impact toughness at -20°C is below 50J, the thickness is thin and the impact toughness at -40°C has not been evaluated

[0005] Considering that the 80mm large-thickness low-alloy wear-resistant steel plate with the best performance not only requires high strength and hardness, but also requires good low-temperature toughness, and all requirements are easy to produce and low in cost; there is no 80mm in the prior art. Large-thickness high-toughness low-alloy wear-resistant steel plate and its manufacturing method related technologies

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