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Method for quenching medium and low carbon alloy structural steel workpieces

A low-carbon alloy and steel parts technology, applied in the field of heat treatment and quenching, can solve the problem of low energy consumption, achieve the effects of overcoming high energy consumption, improving strength and toughness, and being easy to master

Active Publication Date: 2010-04-14
JULI SLING
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the above problems and propose a quenching method for medium and low carbon alloy structural steel parts, so as to realize the advantages of low energy consumption, good environmental protection, strong toughness and not easy to rust, and can meet the low temperature requirements of the sling industry. The need for impact toughness

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Embodiment 1

[0017] According to an embodiment of the present invention, a method for quenching medium and low carbon alloy structural steel parts is provided. In this embodiment, the quenching method of medium and low carbon alloy structural steel parts includes:

[0018] Step 101: Put the medium and low-carbon alloy structural steel parts to be quenched in the quenching furnace and heat them at full power. piece burnt through;

[0019] In step 101, the normal austenitization temperature includes: the normal austenitization temperature of the hypoeutectoid steel is AC 3 +(30-50)℃, the normal austenitization temperature of eutectoid steel and hypereutectoid steel is AC 1 +(30-50)℃; the holding time t is calculated according to the formula t=KD, where K is the holding time coefficient, K is 0.1-0.5min / mm, and D is the wall thickness of the workpiece to be quenched (that is, the effective wall thickness );

[0020] Step 102: Select a quenching liquid corresponding to the material of the ...

Embodiment 2

[0024] The difference from the above embodiment is that in this embodiment, the material of the workpiece is ferrous metal with medium and low hardenability materials such as 20SiMn2MoV, 35CrMo, 42CrMo, and 40CrNiMo, and the corresponding quenching liquid is a water-soluble polymer quenching liquid UCONA (full name in English: UCON Quenchant A), the volume concentration of UCONA is 2-25%, and the quenching intensity H is 1.5-4. In this volume concentration range, the quenching intensity decreases as the concentration increases.

[0025] In this example, UCONA is a water-soluble polymer quenching fluid produced by Union Carbide, which is suitable for heat treatment of ferrous and non-ferrous metals. It can be used in the heat treatment of mesh belt furnaces for small parts, suitable for various induction hardening and flame quenching, suitable for quenching methods such as spraying and dipping, such as gears, crankshafts, camshafts and other components, as well as complex geomet...

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Abstract

The invention discloses a method for quenching medium and low carbon alloy structural steel workpieces, which comprises the following steps: a, placing medium and low carbon alloy structural steel workpieces to be quenched into a quenching furnace, heating until the furnace temperature is higher than normal austenitizing temperature by 100-200 DEG C for preserving the temperature till the workpieces are sufficiently burnt; b, selecting quenching liquid corresponding to materials of the workpieces, adding the quenching liquid into a quenching groove and intensively stirring; sufficiently burning and then placing the workpieces into the quenching liquid to quench. The quenching method can overcome the defects of large energy consumption, poor environmental protection, and the like in the prior art so as to realize the advantages of low energy consumption, good environmental protection, high toughness and difficult rustiness and can meet the requirement of low-temperature impact toughness of a hoisting rigging industry.

Description

technical field [0001] The invention relates to heat treatment quenching technology, in particular to a quenching method for medium and low carbon alloy structural steel parts. Background technique [0002] In the traditional heat treatment, the general principle of quenching medium and low carbon alloy structural steel parts is: at the critical point of steel Ac3+ (30-50 ℃), after heating and heat preservation, put it into oil or water for quenching treatment. [0003] In the past ten years, with the popularization and application of aqueous polymer quenching media and the in-depth research on the mechanism of quenching and cooling process, new progress has been made in quenching and cooling technology, and some new quenching and cooling technologies have been developed, such as strong quenching technology. In addition, in new quenching and heating technologies such as ultra-fine austenite grains, sub-temperature quenching, and high-temperature quenching of medium-carbon s...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D6/00C21D11/00
Inventor 杨建国张洪江马秀英王淼丁得刚刘恩宏
Owner JULI SLING
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