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A production method for improving low-temperature toughness of high-strength thick steel plate

A technology of low temperature toughness and production method, used in furnaces, heat treatment equipment, heat treatment furnaces, etc., can solve the problems of long heating and holding time, unfavorable low temperature toughness, high production cost, and achieve high production efficiency, comprehensive performance improvement, and strength. Effect

Active Publication Date: 2018-02-23
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using this process, the heating and holding time is longer, the productivity is low, the energy consumption is high, and the production cost is high; at the same time, the austenite grains grow significantly during the holding process, which is not good for low temperature toughness

Method used

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  • A production method for improving low-temperature toughness of high-strength thick steel plate
  • A production method for improving low-temperature toughness of high-strength thick steel plate

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Experimental program
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Embodiment 1

[0022] The high-strength steel is composed of the following components (wt%) C: 0.16%, Si: 0.25%, Mn: 1.0%, P≤0.015%, S≤0.008%, Cr: 0.8%, Ni: 0.80%, Mo: 0.35 %, Nb: 0.04%, Ti: 0.015%, B: 0.0015%, and the rest are Fe and inevitable impurities. After smelting according to the above-mentioned composition, it is rolled into a steel plate with a thickness of 30 mm.

[0023] The rolled steel plate is heated in a nitrogen atmosphere protected heating furnace. The temperature of the steel plate into the furnace is ≤50℃, and the furnace temperature is Ac3+70~120℃. A thermocouple is inserted into the surface layer and the core of the steel plate to measure the surface layer. and heart temperature.

[0024] When the surface temperature is higher than Ac3 or reaches the furnace temperature, and the core temperature is between Ac1 and Ac3, the steel plate is quenched by a roll quenching machine; after quenching, the steel plate is tempered at 250°C.

[0025] The mechanical properties of ...

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Abstract

The invention relates to a production method for improving the low-temperature toughness of high-strength thick steel plates, which belongs to the technical field of thick plate production. The rolled thick steel plate adopts the following heat treatment process: when the surface temperature is higher than Ac3 or reaches the furnace temperature, and the core temperature is at Ac1~Ac3, the steel plate is quenched by a roll quenching machine; or when the surface temperature reaches the furnace temperature , When the core temperature is higher than Ac3 but lower than the furnace temperature, use a roll quenching machine to quench the steel plate. After quenching, the steel plate can be tempered at different temperatures or left untreated. Compared with the steel plate produced by the conventional quenching process, the process can reduce the risk of quenching cracking, and the strength of the steel plate produced by this process can be increased by more than 20MPa, and the low-temperature impact energy can be increased by more than 30%. The production process is simple, the cycle is short, the oxidation degree of the steel plate is low, the energy consumption is low, and the production efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of heat treatment production of high-strength thick steel plates, and particularly relates to a heat treatment technology for improving the low-temperature toughness of low-carbon, low-alloy, high-strength thick steel plates. Background technique [0002] High-strength steel can be widely used in mining machinery, coal mining and transportation, agricultural machinery, construction machinery, railway transportation and other industries. The market demand for steel plates is gradually increasing. One of the main reasons that restrict the production and performance of high-strength steel is that with the increase of strength and thickness, the toughness of the steel plate deteriorates, especially the high-strength steel plate with a strength of more than 960MPa and a thickness of more than 30mm. [0003] At present, there are many patents for improving the low temperature toughness of high-strength steel plat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/52C21D1/18
Inventor 镇凡张宽曲锦波
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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