A nitrogen-containing dual-phase corrosion-resistant and wear-resistant hot-rolled steel and its production method

Abstract

The invention discloses nitrogen-containing double-phase corrosion-resistant wear-resistant hot-rolled steel and a production method. The hot-rolled steel is prepared from, by weight, 0.2%-0.40% of Si, 3.0%-5.5% of Mn, 0.03%-0.12% of N, 0.08%-0.30% of Ti, 0.35%-1.50% of Cr and C, wherein the content of C ranges from 1 / 2 Ti to (1 / 2 N+0.10). The production method comprises the steps that after electric furnace smelting, all the components are fed into an argon station for blowing; pouring is conducted after vacuum treatment; a steel billet is heated; rough rolling is carried out after high-pressure descaling; finish rolling is carried out; and then cooling is carried out. According to the nitrogen-containing double-phase corrosion-resistant wear-resistant hot-rolled steel and the productionmethod, it can be guaranteed that the hardness of the steel plate is not lower than 400 HBW, the matrix structure of the steel is a martensite and austenite two-phase structure, the volume fraction ofmartensite ranges from 80% to 95%, and titanium carbonitride particles with the volume fraction ranging from 0.3% to 1.5% and the dimension ranging from 300 nm to 800 nm are distributed in a matrix;and the yield strength ranges from 1,480 MPa to 1,570 MPa, the tensile strength is 1,550 MPa or above, the elongation rate A is 30% or above, the Charpy impact work at -20 DEG C is not lower than 100J / cm<2>, and the production cost is low.

Description

technical field [0001] The invention relates to a hot-rolled wear-resistant steel and a production method, specifically belonging to a nitrogen-containing dual-phase corrosion-resistant and wear-resistant hot-rolled steel. Background technique [0002] At present, mining machinery and construction machinery working on non-road surfaces, especially some of their key components, have been seriously affected due to long-term work in harsh environmental conditions. [0003] At present, the wear-resistant materials used mainly include high manganese steel, low alloy steel and cast iron. However, high manganese steel and cast iron materials generally have poor corrosion resistance. This is because the as-cast structure of high manganese steel is usually composed of austenite, carbide and pearlite, and the precipitates are coarse, so it is difficult to improve its corrosion performance even after water toughening treatment. Cast iron mostly enhances hardness through carbides, tha...

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Problems solved by technology

[0008] After retrieval: the Chinese patent publication number is the document of CN103014521A, discloses a kind of " wear-resisting steel of high hardness and high toughness and production method thereof ", and its steel grade composition contains higher Mn (2.0~2.4%), Cr (1.5~ 2.0%) and other elements, the production process needs to undergo rare earth metamorphism treatment, and after quenching + tempering treatment, phase transformation strengthening is still used to improve wear resistance, and the production cycle is long, and the material hardness is high (about 54HRC), Difficulty in processing

[0009] Chinese patent publication number is the document of CN102943213A, and it discloses " a kind of wear-resisting steel and preparation method thereof for ultrahigh-strength engineering machinery of low alloy ", and its steel grade composition contains higher Mn (0.8~2.0%), Cr ( 1.0~2.5%), Mo (0.3~0.6%) and other alloying elements, two-stage rolling is implemented in the production process, and then the structure is adjusted through the traditional quenching + tempering process, and the matrix structure is single-phase tempered martensite , From the examples, the elongation A of this type of material fluctuates between 9.0 and 14%, and the elongation of the material is not high

[0010] The Chinese patent publication number is CN104357758A, which discloses "a superhard particle reinforced martensitic wear-resistant steel plate and its manufacturing method". The steel composition and production process are: C: 0.20-0.40%, Si : 0.30~0.60%, Mn: 0.50~1.00%, Cr: 0.50~0.80%, Ni: 0.40~0.60%, Mo: 0.30~0.40%, Ti: 0.40~0.80%, Cu: 0.30~0.50%, B: 0.0005-0.003%, etc.; the process is off-line heat treatment quenching and low-temperature tempering after rolling, and the rolled steel plate can obtain TiC precipitates with a volume fraction of 0.5-1.5%, the average particle size of the precipitates is 1 μm, and the wear resistance is Hardox450. More than 1.5 times, the concept of titanium carbide particle strengthening and wear resistance is introduced, but the steel is added with precious microalloying elements such as Ni, Cr, Mo, Cu, etc., and is produced by offline quenching and tempering process, the production cost is high, and the impact Insufficient toughness

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