A heat treatment method for high-strength wear-resistant steel plate

A heat treatment method and technology for wear-resistant steel plates, which are applied in the field of heat treatment of low-alloy high-strength wear-resistant steel plates NM360, can solve problems such as large stress differences in steel plates, difficulty in accurately determining model boundary conditions, and difficulty in developing automatic control systems. shape effect

Active Publication Date: 2011-12-07
SHANXI TAIGANG STAINLESS STEEL CO LTD
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Problems solved by technology

The establishment of the quenching mathematical model has many technical problems such as ①complex modeling and poor adaptability; ②difficulty in measuring related parameters; ③difficult to accurately determine the boundary conditions of the model; ④difficult to solve the model, and many other technical problems, and the development of the automatic control system for the heat treatment process is ver

Method used

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Embodiment

[0024] It is hot-rolled into NM360 steel plates with a specification of 15×2500×8000mm by a medium-thick plate rolling mill, straightened by a straightening machine for 5 passes to ensure the original shape of the plate before heat treatment, and after cleaning the oxide scale on the surface of the steel plate by a shot blasting machine, the roller bottom is used to normalize the steel plate. Furnace and ordinary roller quenching machine heat treatment facilities, the quenching machine model is 3000mm thick plate roller quenching machine, for quenching and low temperature tempering heat treatment.

[0025] This embodiment is the following sequential steps:

[0026] I original shape control

[0027] The hot-rolled steel plate is controlled by the hot-rolling process and combined with the straightening machine for 5-pass straightening, so that the original plate shape unevenness can reach 3mm / 2m.

[0028] II steel plate surface treatment

[0029] Before heat treatment, use a s...

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Abstract

The invention relates to a heat treatment method for high-strength wear-resistant steel plates, which comprises the following steps in turn: I, controlling an original plate shape, wherein a hot-rolled steel plate is subjected to a hot rolling process and is subjected to 5-7-pass straightening by a straightener, so that the plate shape waviness of the steel plate is 2-4mm/2m; II, performing surface treatment, namely performing shot blasting on the upper and lower surfaces of the steel plate by using a shot blasting machine; II, quenching, namely heating the steel plate in a roller hearth normalizing furnace together with the furnace to a critical point Ac3, namely 10-50DEG C, keeping the temperature at a rate of 1.5-2.0min/mm according to the thickness of the steel plate, discharging the steel plate at a rate of 0.10-0.50m/s into a quenching machine, and quenching to room temperature; and IV, tempering, namely performing low temperature tempering treatment on the roller hearth normalizing furnace at the temperature of between 350 and 380DEG C, and controlling the temperature keeping time at a rate of 3min/mm according to the thickness. In the heat treatment method for the high-strength wear-resistant steel plates, the roller hearth normalizing furnace and a common quenching machine are adopted, and the waviness of finished products is 3-6mm/2m.

Description

technical field [0001] The invention relates to a heat treatment method for a high-strength wear-resistant steel plate, in particular to a heat treatment method for a low-alloy high-strength wear-resistant steel plate NM360. technical background [0002] High-strength wear-resistant steel plate belongs to low-alloy high-strength steel, which has the characteristics of high strength (or high hardness), high wear resistance, good plasticity and toughness, and weldability. Under different wear conditions, the wear resistance of the material is mainly determined by the hardness, and the wear resistance increases with the increase of the surface hardness of the material. NM360 refers to high-strength wear-resistant steel with a surface Brinell hardness HB of 360. The yield strength of the product is Rp0.2≥1000MPa, the tensile strength Rm≥1150MPa, and the elongation A≥10%. The matrix is ​​strengthened mainly through "quenching + low temperature It is realized by martensitic struc...

Claims

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Application Information

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IPC IPC(8): C21D8/02
Inventor 张宇斌秦洁李俊生曹永录辛建卿
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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