Hardening and tempering process of alloy-steel pipe

An alloy steel pipe, quenching and tempering technology, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of poor wear resistance, low hardness and large deformation, and achieve the effect of good wear resistance, high hardness and small deformation

Inactive Publication Date: 2014-04-16
佛山市统管金属制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, general alloy steel pipes have weak plasticity, low strength, low pressure resistance, large deformation, low hardness, and poor wear resistance. It is necessary to make alloy steel pipes stronger in plasticity, higher in strength, larger in pressure, smaller in deformation, and harder in hardness. Quenching and tempering process with higher and better wear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A quenching and tempering process for alloy steel pipes, comprising the steps of:

[0013] 1) Annealing treatment: heat up to 720°C at a rate of 55°C / min, hold for 2.5 hours, then cool to 570°C at a rate of 30°C / min, and then cool to room temperature at a rate of 5°C / min;

[0014] 2) Quenching treatment: heat up to 810°C at a rate of 25°C / min, hold for 3.5 hours, then spray with 35% salt water to rapidly cool to 260°C at a rate of 255°C / s, and then heat at 15°C / min The speed is cooled to 80°C;

[0015] 3) Tempering treatment: heat up to 710°C at a rate of 35°C / min, hold for 8 hours, and then cool to room temperature at a rate of 10°C / min.

Embodiment 2

[0017] A quenching and tempering process for alloy steel pipes, comprising the steps of:

[0018] 1) Annealing treatment: heat up to 700°C at a rate of 50°C / min, hold for 1.5 hours, then cool to 570°C at a rate of 30°C / min, and then cool to room temperature at a rate of 5°C / min;

[0019] 2) Quenching treatment: heat up to 800°C at a rate of 20°C / min, hold for 2.5 hours, then spray with 30% brine to rapidly cool to 250°C at a rate of 250°C / s, and then heat at 15°C / min The speed is cooled to 70°C;

[0020] 3) Tempering treatment: heat up to 700°C at a rate of 30°C / min, hold for 7 hours, and then cool to room temperature at a rate of 10°C / min.

Embodiment 3

[0022] A quenching and tempering process for alloy steel pipes, comprising the steps of:

[0023] 1) Annealing treatment: heat up to 710°C at a rate of 52°C / min, hold for 2 hours, then cool to 570°C at a rate of 30°C / min, and then cool to room temperature at a rate of 5°C / min;

[0024] 2) Quenching treatment: heat up to 804°C at a rate of 23°C / min, hold for 3 hours, then spray with 32% brine to rapidly cool to 257°C at a rate of 253°C / s, and then heat at 15°C / min The speed is cooled to 76°C;

[0025] 3) Tempering treatment: heat up to 702°C at a rate of 33°C / min, hold for 7.5 hours, and then cool to room temperature at a rate of 10°C / min.

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PUM

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Abstract

The invention discloses a hardening and tempering process of an alloy-steel pipe. The process comprises the following steps: 1) conducting annealing treatment: heating to the temperature up to 700-720 DEG C at the speed of 50-55 DEG C/min, and conducting heat preservation for 1.5-2.5 hours, cooling the temperature down to 570 DEG C at the speed of 30 DEG C/min, and cooling the temperature down to the room temperature at the speed of 5 DEG C/min; 2) conducting quenching treatment: heating to the temperature up to 800-810 DEG C at the speed of 20-25 DEG C/min, conducting heat preservation for 2.5-3.5 hours, spraying by brine with the concentration of 30-35% to rapidly cool the temperature down to 250-260 DEG C at the speed of 250-255 DEG C/s, and cooling the temperature down to 70-80 DEG C at the speed of 15 DEG C/min; 3) conducting tempering treatment: heating to the temperature up to 700-710 DEG C at the speed of 30-35 DEG C/min, conducting heat preservation for 7-8 hours, and cooling the temperature down to the room temperature at the speed of 10 DEG C/min. Through the adoption of the hardening and tempering process of the alloy-steel pipe, the alloy-steel pipe being subjected to hardening and tempering is high in plasticity, strength, pressure resistance, and hardness, low in deformation, and good in abrasive resistance.

Description

technical field [0001] The invention relates to a quenching and tempering process for alloy steel pipes. Background technique [0002] At present, general alloy steel pipes have weak plasticity, low strength, low pressure resistance, large deformation, low hardness, and poor wear resistance. It is necessary to make alloy steel pipes stronger in plasticity, higher in strength, larger in pressure, smaller in deformation, and harder in hardness. Higher, better wear resistance quenching and tempering process. Contents of the invention [0003] The object of the present invention is to provide a quenching and tempering process for alloy steel pipes, which makes the quenched and tempered alloy steel pipes strong in plasticity, high in strength, high in pressure, small in deformation, high in hardness and good in wear resistance. [0004] In order to achieve the above object, the technical solution of the present invention is to design a quenching and tempering process for alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/25C21D9/08
Inventor 须晓东
Owner 佛山市统管金属制品有限公司
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