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Stainless steel composite steel butt-welded pipe fitting heat treatment process

A technology for stainless steel and pipe fittings, applied in the field of heat treatment process of stainless steel composite butt welded pipe fittings, can solve the problems of influence, quality damage, temperature difference, etc., and achieve the effects of good comprehensive benefits, alleviation of high temperature impact, and prolonged service life.

Active Publication Date: 2021-11-26
江苏福源泰管业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In traditional process design, the parameters are generally only related to steel grade and steel type, and the uniformity of heating temperature is less considered during large-capacity heating. However, with large-capacity heat treatment, temperature differences are easily generated, and the steel pipes are even the same. Different sections of steel pipe are affected, resulting in quality damage

Method used

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  • Stainless steel composite steel butt-welded pipe fitting heat treatment process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A heat treatment process for stainless steel composite steel butt-welding pipe fittings, including primary treatment, preheating, two-stage quenching, secondary treatment, and one-stage tempering, wherein the primary treatment and secondary treatment are heat transfer fluids with different lubricating oil contents Coating of pipes to be processed.

[0025] Among them, the heat transfer liquid includes hydrophobic silica sol particles, silicon nitride particles, and polyacrylic acid emulsion, and the mass ratio of the three is 5:1:28. Moreover, the hydrophobic silica sol particles are methyltriethoxysilane modified silica sol, the oil contact angle is 8.6±1.3°, the hydrophobic silica sol particles are dried and crushed to a D90 of 50 μm, and the particle size of the silicon nitride particles is The solid content of the polyacrylic acid emulsion is 38% if it is less than 1 μm.

[0026] Further, the lubricating oil is 3# nano-based lubricating oil, the lubricating oil acc...

Embodiment 2

[0036] A heat treatment process for stainless steel composite steel butt-welding pipe fittings, including primary treatment, preheating, two-stage quenching, secondary treatment, and one-stage tempering, wherein the primary treatment and secondary treatment are heat transfer fluids with different lubricating oil contents Coating of pipes to be processed.

[0037] Wherein, the heat transfer liquid includes hydrophobic silica sol particles, silicon nitride particles, and polyacrylic acid emulsion, and the mass ratio of the three is 3:0.5:15. Moreover, the hydrophobic silica sol particles are methyltriethoxysilane modified silica sol, the oil contact angle is 8.6±1.3°, the hydrophobic silica sol particles are dried and crushed to a D90 of 50 μm, and the particle size of the silicon nitride particles is The solid content of the polyacrylic acid emulsion is 38% if it is less than 1 μm.

[0038] Further, the lubricating oil is 3# nano-based lubricating oil, and the lubricating oil ...

Embodiment 3

[0048] A heat treatment process for stainless steel composite steel butt-welding pipe fittings, including primary treatment, preheating, two-stage quenching, secondary treatment, and one-stage tempering, wherein the primary treatment and secondary treatment are heat transfer fluids with different lubricating oil contents Coating of pipes to be processed.

[0049] Wherein, the heat transfer liquid includes hydrophobic silica sol particles, silicon nitride particles, and polyacrylic acid emulsion, and the mass ratio of the three is 2:0.6:20. Moreover, the hydrophobic silica sol particles are methyltriethoxysilane modified silica sol, the oil contact angle is 8.6±1.3°, the hydrophobic silica sol particles are dried and crushed to a D90 of 50 μm, and the particle size of the silicon nitride particles is The solid content of the polyacrylic acid emulsion is 38% if it is less than 1 μm.

[0050] Further, the lubricating oil is 3# nano-based lubricating oil, and the lubricating oil ...

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Abstract

The invention provides a stainless steel composite steel butt-welded pipe fitting heat treatment process. The process comprises primary treatment, preheating, two-stage quenching, secondary treatment and one-stage tempering, and the primary treatment and the secondary treatment are adopted for coating a to-be-processed pipe fitting with heat transfer fluids with different lubricating oil contents. According to the process, the steps of the heat treatment process are optimized, quenching and tempering time and parameters are adjusted in a targeted manner, meanwhile, two-stage treatment is matched, excellent heat balance is provided for the pipe fitting, temperature transfer is efficient and stable, the heat treatment quality is greatly improved, the mechanical property of the pipe fitting is remarkably improved, and the effective service life is prolonged by more than one time.

Description

technical field [0001] The invention relates to the technical field of processing stainless steel composite steel butt welding pipe fittings, in particular to a heat treatment process for stainless steel composite steel butt welding pipe fittings. Background technique [0002] Steel is a building material widely used in the modern construction industry, especially in pipeline engineering, large and small steel pipes are used in gas transmission, water transmission and oil transmission lines. Composite steel pipe refers to a steel pipe with seamless steel pipe or welded steel pipe as the base pipe, and the inner wall is coated with high adhesion, anti-corrosion, food-grade hygienic polyethylene powder coating or epoxy resin coating. [0003] The steel pipe heat treatment process is to heat the steel pipe workpiece to a certain temperature for a period of time, and then make it cool at a certain cooling rate. Steel pipe heat treatment is a heat treatment method in which the s...

Claims

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Application Information

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IPC IPC(8): C21D9/08C21D1/18C21D1/70C21D1/78
CPCC21D9/08C21D1/18C21D1/78C21D1/70Y02P10/20
Inventor 苏兴生张睿
Owner 江苏福源泰管业有限公司
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