High-strength steel thin-wall piece vacuum thermal treatment process

A technology of vacuum heat treatment and thin-walled parts, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of small safety factor, high cost, high labor intensity, etc., and achieve increased solid solution strengthening effect and phase transformation strengthening effect. , Eliminate manual cooling operation and cleaning operation, and improve the effect of production efficiency

Inactive Publication Date: 2012-07-11
HENAN BEIFANG HONGYANG IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the heat treatment of high-strength structural steel in China, especially small pieces of high-strength steel, mainly relies on the heat treatment process of salt bath heating and isothermal quenching. Bath isothermal quenching, the process is cumbersome, with many human factors, high labor intensity, small safety factor, high cost, oxidation, poor finish, and low dimensional accuracy

Method used

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  • High-strength steel thin-wall piece vacuum thermal treatment process
  • High-strength steel thin-wall piece vacuum thermal treatment process
  • High-strength steel thin-wall piece vacuum thermal treatment process

Examples

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Embodiment 1

[0021] Example 1: Thin-walled parts made of high-strength steel: support cylinder, see attached figure 2 , The material is 35CrMnSiA, cleaned with aviation washing gasoline, and then vacuum heat treated after drying. When vacuum quenching, when the vacuum degree reaches 3.51×10 -3 After Pa, heat at 12°C / min to 650°C for 25 minutes, then heat at 15°C / min to 870°C for 35 minutes, then fill the furnace with 8.5bar high-purity nitrogen for pressure quenching, and cool to 60°C , and then conduct vacuum tempering directly; during vacuum tempering, when the vacuum degree reaches 3.32×10 -3 Pa, fill the furnace with 1bar high-purity nitrogen, and then heat at 15°C / min to 290°C-310°C for 2 hours, then fill the furnace with 3bar high-purity nitrogen for air pressure cooling, and cool to 50°C- Baked at 60°C. After the thin-walled parts are oiled and rust-proofed, the hardness and size are tested, and the furnace samples are subjected to tensile tests.

Embodiment 2

[0022] Example 2: Thin-walled parts made of high-strength steel: baffle, see attached image 3 , material 45CrNiMo1VA, when vacuum quenching, when the vacuum degree reaches 4.51×10 -3 After Pa, heat at 12°C / min to 650°C for 25 minutes, then heat at 15°C / min to 880°C for 30 minutes, then fill the furnace with 8bar high-purity nitrogen for pressure quenching, and cool to 60°C. Then carry out vacuum tempering directly; when vacuum tempering, when the vacuum degree reaches 4.32×10 -3 Pa, fill the furnace with 1bar high-purity nitrogen, then convectively heat at 15°C / min to 490°C-510°C for 1.5 hours, then fill the furnace with 3bar high-purity nitrogen for air pressure cooling, and cool to 50°C ~ 60 ℃ out of the oven. After the thin-walled parts are oiled and rust-proofed, the hardness and size are tested, and the furnace samples are subjected to tensile tests.

[0023] The following table lists the materials, specifications, furnace loading and vacuum heat treatment process par...

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Abstract

The invention discloses a high-strength steel thin-wall piece vacuum thermal treatment process, which comprises vacuum quenching and vacuum tempering, wherein the vacuum quenching comprises the following specific steps of: heating to 650 DEG C at the vacuum degree between 1.33*10<-4> Pa and 1.33*10<-2> Pa; preserving heat for 25 minutes; heating to 870-880 DEG C; preserving heat for 30-35 minutes; charging 7-9 bar of high-purity nitrogen gas into a furnace for performing air pressure quenching; and cooling to 50-60 DEG C; and vacuum tempering comprises the following specific steps of: performing counter-flow heating to a tempering temperature under the protection of 1-1.5 bar of high-purity nitrogen gas; preserving heat for 1.5-2 hours; charging 3-4 bar of high-purity nitrogen gas into the furnace for performing air pressure cooling; and cooling to a low temperature for discharging. A high-strength steel thin-wall piece vacuum thermal treatment surface has the advantages of freeness from oxidation and decarburization, high size precision, uniform hardness, high strength and low cost.

Description

technical field [0001] The invention belongs to the field of vacuum heat treatment, in particular to a vacuum heat treatment process for high-strength steel thin-walled parts. Background technique [0002] Vacuum heat treatment (high pressure gas quenching) has the advantages of no oxidation, no decarburization, degreasing, small deformation, high automation, and good finish. It is a metal thermal processing method that the heat treatment industry has long pursued. Vacuum heat treatment (high pressure gas quenching) has been widely used in the heat treatment of die steel, but it is rarely used in the heat treatment of high-strength structural steel. [0003] At present, the heat treatment of high-strength structural steel in China, especially small pieces of high-strength steel, mainly relies on the heat treatment process of salt bath heating and isothermal quenching. Bath isothermal quenching, the process is cumbersome, with many human factors, high labor intensity, small ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/773C21D1/18C21D9/00
Inventor 郭十奇马金海谢宏杨有才柯美武
Owner HENAN BEIFANG HONGYANG IND
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