CN1159461C - Deep-cold treating technology of steel workpiece - Google Patents
Deep-cold treating technology of steel workpiece Download PDFInfo
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- CN1159461C CN1159461C CNB011317728A CN01131772A CN1159461C CN 1159461 C CN1159461 C CN 1159461C CN B011317728 A CNB011317728 A CN B011317728A CN 01131772 A CN01131772 A CN 01131772A CN 1159461 C CN1159461 C CN 1159461C
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Abstract
In the technology of the present invention, workpieces are quenched before the subzero treatment is carried out, and the subzero treatment is carried out in liquid nitrogen. The tempering is carried out after the quenching is finished, and the subzero treatment is carried out after the tempering is finished. The liquid nitrogen temperature is-170 to-196 DEG C; the isothermal time of carbon steel and low alloy steel workpieces in liquid nitrogen is the effective thickness or the effective diameter of the workpieces multiplying with (2 to 3 min/mm). The isothermal time of high alloy steel is the effective thickness or the effective diameter of the workpieces multiplying with (5 to 8 min/mm). The double tempering is carried out after the high alloy steel is quenched. Workpieces of complicated shape or large size are carried out with the subzero treatment for 2 to 3 times. The steel workpieces are placed in oil liquid of 100 to 200DEG C for heating after the subzero treatment is finished.
Description
Technical field
The present invention is a kind of thermal treatment process of steel workpiece, is specially adapted to the highly malleablized of high alloy steel workpiece.
Technical background
In the prior art, the workpiece that is used for sub-zero treatment is the steel work in-process, according to the phase critical point of different steel grades, carries out quench treatment earlier, is heated to 100 ℃ then, carries out sub-zero treatment in-170 ℃ liquid nitrogen, carries out temper at last.High alloy steel workpiece carries out temper three times behind deep cooling.It is insufficient that above-mentioned sub-zero treatment makes in the steel carbide separate out, and residual austenite is also insufficient to membranaceous transformation by bulk, thereby can not improve the intensity and the toughness of work in-process workpiece to a greater extent.The high quality steel workpiece carries out three tempering behind deep cooling, energy consumption is higher.
Summary of the invention
The present invention is a kind of deep-cold treating technology of steel workpiece, workpiece carries out tempering after quenching, carry out sub-zero treatment after the tempering, liquid nitrogen temperature is-170 ∽-196 ℃, isothermal time in liquid nitrogen is: the isothermal time of carbon steel and low alloy steel system workpiece multiply by (2 ∽ 3min/mm) for the net thickness or the effective diameter of its workpiece, and the isothermal time of high quality steel multiply by (5 ∽ 8min/mm) for the net thickness or the effective diameter of its workpiece.High quality steel carries out three tempering at 600 ℃ after quenching, and carries out 1 hour at every turn.Steel workpiece is placed on the inferior of 200 ℃ of 100 ∽ behind deep cooling carried out 1 hour.Steel workpiece is placed on behind deep cooling in the fluid of 200 ℃ of 100 ∽ and heats.Complex-shaped or large-scale workpiece carries out 2-3 sub-zero treatment.High quality steel carries out double tempering after quenching, and lacks a tempering than prior art, has saved the energy.
Steel workpiece through cryogenic technology processing of the present invention, its carbide is fully separated out, and there is the carbide of nanoscale to separate out, residual austenite is fully changed into membranaceous by bulk, compare with the workpiece of deep cooling not, the many of workpiece increase by 1.5 times towards toughness, and toughness also increases, and wear resistance has improved 2-3 doubly.
Specific implementation
For carbon steel and low alloy steel system workpiece, as 9SiCr, GCr15 steel workpiece, the phase critical point specific according to its steel grade carries out quench treatment, carry out a tempering then, in-170 ∽-190 ℃ liquid nitrogen, carry out sub-zero treatment after the tempering, the isothermal time of sub-zero treatment is that the net thickness or the effective diameter of workpiece multiply by (2 ∽ 3min/mm), for complex-shaped or large-scale workpiece, carry out 3 sub-zero treatments of 2 ∽, in the fluid of 200 ℃ of 100 ∽, heat at last, workpiece is taken out in the heating back, is placed to room temperature.
For high alloy steel workpiece, as Cr12MoV steel, W18Cr4V steel and W6Mo5Cr4V2 steel, the phase critical point specific according to its steel grade carries out quench treatment, carry out double tempering then, in-170 ∽-190 ℃ liquid nitrogen, carry out sub-zero treatment after the tempering, the isothermal time of sub-zero treatment is that the net thickness or the effective diameter of workpiece multiply by (2 ∽ 3min/mm), for complex-shaped or large-scale workpiece, carry out 3 sub-zero treatments of 2 ∽, in the fluid of 200 ℃ of 100 ∽, heat at last, workpiece is taken out in the heating back, is placed to room temperature.
Sub-zero treatment equipment is an open type 100 liter vacuum insulation equipment, and its technical parameter is: medium for storing: liquid nitrogen, nominal volume: 100ml, container day rate of evaporation≤3.5%/day, container closure vacuum tightness≤6.67 * 10
-3Pa, static venting rate≤1.33 * 10 of leaking of container interlayer
-5PaL/s, adiabatic method: high vacuum+multilayer multi shields insulation, maximum capacity≤50Kg.
Claims (4)
1, a kind of deep-cold treating technology of steel workpiece, it is characterized in that: workpiece carries out tempering after quenching, carry out sub-zero treatment after the tempering, liquid nitrogen temperature is-170 ∽-196 ℃, isothermal time in liquid nitrogen is: the isothermal time of carbon steel and low alloy steel system workpiece multiply by (2 ∽ 3min/mm) for the net thickness or the effective diameter of its workpiece, and the isothermal time of high quality steel multiply by (5 ∽ 8min/mm) for the net thickness or the effective diameter of its workpiece.
2, metal cryogenic treatment process according to claim 1 is characterized in that carrying out three tempering at 600 ℃ after high quality steel quenches, and carries out 1 hour at every turn.
3, metal cryogenic treatment process according to claim 1 is characterized in that complex-shaped or large-scale workpiece carries out 3 sub-zero treatments of 2 ∽.
4, metal cryogenic treatment process according to claim 1, it is characterized in that steel workpiece is placed on behind deep cooling in the fluid of 200 ℃ of 100 ∽ heats.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011317728A CN1159461C (en) | 2001-10-16 | 2001-10-16 | Deep-cold treating technology of steel workpiece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011317728A CN1159461C (en) | 2001-10-16 | 2001-10-16 | Deep-cold treating technology of steel workpiece |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1363695A CN1363695A (en) | 2002-08-14 |
| CN1159461C true CN1159461C (en) | 2004-07-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011317728A Expired - Fee Related CN1159461C (en) | 2001-10-16 | 2001-10-16 | Deep-cold treating technology of steel workpiece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1159461C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239443B (en) * | 2007-02-09 | 2010-08-25 | 周瑞生 | High-efficiency processing grinding technique of high-hardness high-precision metal parts inner hole outer circularity |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100390305C (en) * | 2005-06-28 | 2008-05-28 | 大连理工大学 | Deep cooling treatment method of high speed steel tool |
| CN102230062A (en) * | 2011-06-10 | 2011-11-02 | 西南交通大学 | Heat treatment process for improving strength and toughness of 9SiCr die steel |
| CN102900897A (en) * | 2011-07-28 | 2013-01-30 | 锐迈管业有限公司 | Concrete pump truck elbow and machining technology thereof |
| CN102296167A (en) * | 2011-08-11 | 2011-12-28 | 南车眉山车辆有限公司 | Cryogenic treatment process for 9SiCr die steel used for railway freight cars |
| CN103352112B (en) * | 2013-07-12 | 2015-03-25 | 上海汇众汽车车桥系统有限公司 | Cryogenic process for prolonging service life of jet-moulded high-speed steel milling cutter |
| CN104087743B (en) * | 2014-06-25 | 2016-01-20 | 南通大学 | A kind for the treatment of process improving slitting blank cutter cutting steel wire work-ing life |
| CN104404223A (en) * | 2014-12-18 | 2015-03-11 | 无锡伊诺永利文化创意有限公司 | Isothermal quenching and tempering process for 9SiCr steel circular dies |
| CN105586477A (en) * | 2016-03-01 | 2016-05-18 | 江苏星火特钢有限公司 | Method for improving hardness of 3D printing martensitic stainless steel structural part |
| CN110722737B (en) * | 2019-10-30 | 2022-04-12 | 厦门东抚工贸有限公司 | Assembled die carrier and production process thereof |
| CN111270050A (en) * | 2020-04-09 | 2020-06-12 | 重庆优特模具有限公司 | Cryogenic treatment process and die steel thereof |
| CN113046525A (en) * | 2021-03-10 | 2021-06-29 | 成都先进金属材料产业技术研究院股份有限公司 | Heat treatment process of Cr12MoV steel |
-
2001
- 2001-10-16 CN CNB011317728A patent/CN1159461C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239443B (en) * | 2007-02-09 | 2010-08-25 | 周瑞生 | High-efficiency processing grinding technique of high-hardness high-precision metal parts inner hole outer circularity |
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| Publication number | Publication date |
|---|---|
| CN1363695A (en) | 2002-08-14 |
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