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Atmospheric protective heat treatment process for ultra-high strength d6ac steel thin-walled pipe fittings

An ultra-high-strength, protective treatment technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of poor dimensional stability, large machining allowance, thick oxide skin, etc., and achieve good dimensional stability and no peeling on the surface Effect of carbon and internal stress reduction

Inactive Publication Date: 2019-12-27
HENAN NORTHERN HONGYANG ELECTROMECHANICAL CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] At present, domestic heat treatment of ultra-high-strength D6AC steel, especially thin-walled pipe fittings made of ultra-high-strength D6AC steel, mainly relies on quenching and tempering heat treatment process. , box furnace tempering heating, heat preservation, tap water tempering cooling, this process has thick oxide skin, large machining allowance, low strength, low toughness and plasticity, large internal stress, large deformation after subsequent machining, and poor dimensional stability; The tensile strength obtained by the process is within 1530Mpa, the yield strength is within 1420Mpa, the elongation after fracture is within 9%, and the reduction of area is within 35%.

Method used

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  • Atmospheric protective heat treatment process for ultra-high strength d6ac steel thin-walled pipe fittings
  • Atmospheric protective heat treatment process for ultra-high strength d6ac steel thin-walled pipe fittings
  • Atmospheric protective heat treatment process for ultra-high strength d6ac steel thin-walled pipe fittings

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Embodiment

[0022] Example: high-strength D6AC steel thin-walled pipe fittings, material 45CrNiMo1VA, atmosphere protection quenching is under the protection of a carbon potential atmosphere of 0.45% c, heated to 750°C at 10°C / min for 30 minutes, and then preheated at 13°C / min Minute heating to 890°C for 50 minutes, then transferred to 50°C normal speed quenching oil for quenching and cooling for 15 minutes, and then cleaned; secondary nitrogen protection tempering: the first tempering is to the furnace with 5NM 3 After filling high-purity nitrogen at a flow rate of / h, heat it at 13°C / min to 520°C for 2 hours, and then temper and cool it in a tap water cooler; 3 After being filled with high-purity nitrogen at a flow rate of / h, it is heated at 13°C / min to 470°C for 1 hour, and then naturally cooled in the air. The same batch of thin-walled pipe fittings is tested for hardness, and the pipe fittings with the highest hardness value and the lowest hardness value are selected for tensile tes...

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Abstract

The invention discloses an atmosphere protection heat treatment technology of an ultrahigh strength D6AC steel thin-wall tube. The atmosphere protection heat treatment technology is characterized by comprising the steps of atmosphere protection quenching, secondary nitrogen protection tempering, and vacuum heat aging after semi-finishing. Compared with the prior art, the solution strengthening effect, the phase change strengthening effect and the dispersion strengthening of ultrahigh strength steel can be improved, the internal stress is reduced, and oxygenation and decarbonization are eliminated, so that the tensile strength, the yield strength, the percentage elongation after fracture, the percentage reduction of area, and the size stability and precision after finishing of the thin-wall tube are improved, and a machining allowance before heat treatment is reduced.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, and in particular relates to an atmosphere protection heat treatment process for ultra-high-strength D6AC steel thin-walled pipe fittings. Background technique [0002] Atmosphere protection heat treatment has the advantages of no oxidation and decarburization, high strength, good toughness and plasticity, small internal stress, good dimensional stability and high precision after machining, and is a metal thermal processing method pursued by the heat treatment industry for a long time. Atmosphere protection heat treatment has been widely used in the heat treatment of tempered steel precision parts, but it is rarely used in the heat treatment of ultra-high strength D6AC steel. [0003] At present, domestic heat treatment of ultra-high-strength D6AC steel, especially thin-walled pipe fittings made of ultra-high-strength D6AC steel, mainly relies on quenching and tempering heat treatmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/08C21D1/18C21D1/773C21D1/74
CPCC21D1/18C21D1/74C21D1/773C21D9/08C21D9/085
Inventor 杨有才柯美武王光志薛晓苍张学军
Owner HENAN NORTHERN HONGYANG ELECTROMECHANICAL CO LTD
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