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Heat treatment technology of high strength steel pipe

A high-strength, steel pipe technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as insufficient strength, water pipe expansion, cracking, etc., and achieve the effect of strengthening hardness

Inactive Publication Date: 2014-04-16
CHANGSHU DONGXIN STEEL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing support steel pipes are often bent or even broken after supporting heavy objects due to insufficient strength. Existing water pipes are likely to swell and burst in winter due to expansion. Therefore, how to strengthen the strength of steel pipes is an urgent issue. unresolved issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A heat treatment process for high-strength steel pipes, comprising the steps of:

[0016] 1) Extend the steel pipe into a holding furnace with a furnace temperature of 410°C at a feed speed of 1 m / h for preheating;

[0017] 2) Extend the steel pipe into a heating furnace with a furnace temperature of 710°C at a feed speed of 4 m / h for heat treatment;

[0018] 3) Extend the steel pipe into a quenching tube with a tube length of 10 meters at a feed speed of 3 m / h for the first quenching, take out the steel pipe and air cool to room temperature;

[0019] 4) Extend the steel pipe into a tempering furnace with a furnace temperature of 610°C at a feed speed of 2 m / h for tempering treatment;

[0020] 5) Extend the steel pipe into a heating furnace with a furnace temperature of 1210°C at a feed speed of 1 m / h for secondary heat treatment;

[0021] 6) Put the steel pipe into 610°C high-temperature quenching oil to cool naturally. When the temperature of the steel pipe and quen...

Embodiment 2

[0023] A heat treatment process for high-strength steel pipes, comprising the steps of:

[0024] 1) Extend the steel pipe into a holding furnace with a furnace temperature of 400°C at a feed speed of 1 m / h for preheating;

[0025] 2) Extend the steel pipe into a heating furnace with a furnace temperature of 700°C at a feed speed of 4 m / h for heat treatment;

[0026] 3) Extend the steel pipe into a quenching tube with a tube length of 10 meters at a feed speed of 3 m / h for the first quenching, take out the steel pipe and air cool to room temperature;

[0027] 4) Extend the steel pipe into a tempering furnace with a furnace temperature of 600°C at a feed speed of 2 m / h for tempering treatment;

[0028] 5) Extend the steel pipe into a heating furnace with a furnace temperature of 1200°C at a feed speed of 1 m / h for secondary heat treatment;

[0029] 6) Put the steel pipe into 600°C high-temperature quenching oil to cool naturally. When the temperature of the steel pipe and quen...

Embodiment 3

[0031] A heat treatment process for high-strength steel pipes, comprising the steps of:

[0032] 1) Extend the steel pipe into a holding furnace with a furnace temperature of 405°C at a feed speed of 1 m / h for preheating;

[0033] 2) Extend the steel pipe into a heating furnace with a furnace temperature of 707°C at a feed speed of 4 m / h for heat treatment;

[0034] 3) Extend the steel pipe into a quenching tube with a tube length of 10 meters at a feed speed of 3 m / h for the first quenching, take out the steel pipe and air cool to room temperature;

[0035] 4) Extend the steel pipe into a tempering furnace with a furnace temperature of 608°C at a feed speed of 2 m / h for tempering treatment;

[0036] 5) Extend the steel pipe into a heating furnace with a furnace temperature of 1204°C at a feed speed of 1 m / h for secondary heat treatment;

[0037] 6) Put the steel pipe into 602°C high-temperature quenching oil to cool naturally. When the temperature of the steel pipe and quen...

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PUM

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Abstract

The invention discloses a heat treatment technology of a high strength steel pipe. The heat treatment technology comprises the following steps: 1) putting the steel pipe into a holding furnace with the temperature of 400-410 DEG C at the feeding speed of 1 m / h for preheating; 2) putting the steel pipe into a heating furnace with the temperature of 700-710 DEG C at the feeding speed of 4 m / h for heat treatment; 3) putting the steel pipe into a quenching cylinder with the length of 10 m at the feeding speed of 3 m / h for primary quenching, taking out the steel pipe, and cooling with air to the room temperature; 4) putting the steel pipe into a tempering furnace with the temperature of 600-610 DEG C at the feeding speed of 2m / h for tempering; 5) putting the steel pipe into a heating furnace with the temperature of 1,200-1,210 DEG C at the feeding speed of 1 m / h for secondary heat treatment; 6) placing the steel pipe into high temperature quenching oil with the temperature of 600-610 DEG C to cool down naturally, and when the temperatures of the steel pipe and the quenching oil are cooled down to 300-310 DEG C, taking out the steel pipe and cooling with air to the room temperature. Through the adoption of the heat treatment technology of the high strength steel pipe, the hardness and the toughness of the steel pipe are enhanced.

Description

technical field [0001] The invention relates to a heat treatment process for high-strength steel pipes. Background technique [0002] The existing support steel pipes are often bent or even broken after supporting heavy objects due to insufficient strength. The existing water pipes are likely to swell and burst in winter due to expansion. Therefore, how to strengthen the strength of the steel pipes is an urgent issue. unresolved issues. Contents of the invention [0003] The object of the present invention is to provide a heat treatment process for high-strength steel pipes, which enhances the hardness and toughness of the steel pipes. [0004] In order to achieve the above object, the technical solution of the present invention is to design a heat treatment process for high-strength steel pipes, comprising the steps of: [0005] 1) Extend the steel pipe into a holding furnace with a furnace temperature of 400-410°C at a feed speed of 1 m / h for preheating; [0006] 2) E...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D9/08
Inventor 须晓东
Owner CHANGSHU DONGXIN STEEL PIPE