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Method of improving mechanical performance of low carbon steel by tempered fast cooling

A low-carbon steel, performance technology, applied in heat treatment equipment, heat treatment process control, manufacturing tools and other directions, can solve the problems of high temperature, increased cost, complex process, etc., to save microalloy resources, save energy, and simplify the process. Effect

Inactive Publication Date: 2008-10-15
UNIV OF SCI & TECH BEIJING
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  • Application Information

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Problems solved by technology

[0005] Both quenching and tempering treatment and non-quenching and tempering treatment can improve the strength level of steel, but quenching and tempering treatment needs to be heated twice, the temperature required for quenching is high, the energy consumption is large, and the process is complicated
Non-quenching and tempering treatment needs to add microalloying elements, which increases the cost

Method used

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  • Method of improving mechanical performance of low carbon steel by tempered fast cooling
  • Method of improving mechanical performance of low carbon steel by tempered fast cooling

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Embodiment Construction

[0015] The inventors have studied the effects of different treatment temperatures, different treatment times and different cooling methods on the properties of steel.

[0016] (1) The low-carbon high-strength steel ZJ330 plate produced by the CSP production line has a coil number of 53921, and its original σ s , σ b , δ are 339MPa, 397MPa and 45%, respectively, and its organization is ferrite + a small amount of pearlite. They were heated to 200-700°C respectively, held for 20 minutes, cooled to room temperature with water, and the mechanical properties of the treated steel were measured. The results are shown in Table 1, figure 1 . It can be seen that when the heating temperature of the sub-quenching and tempering treatment is 500-700°C, the strength of the steel can be improved.

[0017] Table 1 Mechanical properties of steel at different treatment temperatures

[0018] temperature,

[0019] 600

[0020] (2) The low-carbon steel ZJ330 plate produce...

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Abstract

The invention offers a backfire rapid cooling increasing low carbon steel mechanical property method. It belongs to metallic material heat treatment technique field. Its steps are adopting low carbon steel whose carbon content is C<=0.08%; heating up to 450-700 centigrade degree; preserving heat for 30s-2120m;rapid cooling to room temperature, its cooling medium is water or other whose cooling speed reach or exceed water; and cooling speed is 100-500 centigrade degree per second. The low carbon steel includes structural carbon steel and micro-alloyed steel. There is no need adding micro-alloy element and two heating. And it can economize micro-alloy resource and energy consumption, and simplify working procedure.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, and in particular provides a method for improving the mechanical properties of low-carbon steel through tempering and rapid cooling. Background technique [0002] Commonly used heat treatment processes include quenching, tempering, annealing and normalizing. [0003] Quenching is heating the steel to the critical temperature (A c3 or A c1 ) above, heat preservation for a certain period of time to make it austenitized, and then sharply cool at a cooling rate greater than the critical cooling rate to obtain a heat treatment method for bainite / martensite structure; tempering is to heat the quenched steel to a temperature lower than A 1 A certain temperature at the point, after holding for a certain period of time, cool to room temperature in an appropriate way; annealing is to heat the steel to a temperature lower than or higher than A c1 temperature, keep it for a cert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D11/00
Inventor 傅杰吴华杰刘阳春康永林于浩李晶方克明
Owner UNIV OF SCI & TECH BEIJING