CN107937672A - The process for quenching that a kind of special thick structural alloy steel different medium is alternately cooled - Google Patents
The process for quenching that a kind of special thick structural alloy steel different medium is alternately cooled Download PDFInfo
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- CN107937672A CN107937672A CN201711364179.9A CN201711364179A CN107937672A CN 107937672 A CN107937672 A CN 107937672A CN 201711364179 A CN201711364179 A CN 201711364179A CN 107937672 A CN107937672 A CN 107937672A
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- cooling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
Abstract
The invention discloses the process for quenching that a kind of special thick structural alloy steel different medium is alternately cooled, comprise the following steps：The thick structural alloy steel of spy by high-temperature heating complete austenitizing is quickly put into quenching bath and accelerates cooling, 850 860 DEG C of surface of steel plate temperature when entering water, 30 50 DEG C of quenching bath water temperature when entering water；Step 1）In enter the water cooling first stage：The water surface is hung out after entering water cooling 100 seconds, is cooled down 300 seconds in atmosphere, cooling procedure light plate red temperature is 580 600 DEG C；Step 1）In enter water cooling second stage：The water surface is hung out after entering water rapid cooling 150 seconds to cool down in atmosphere, cooling procedure light plate red temperature is 490 520 DEG C.Through the above technical solutions, on the premise of ensureing that steel plate quenching degree improves hardness, the thermal stress and structural stress in its cooling procedure can be significantly reduced, thick structural alloy steel hardening break of effectively guarding against enemy agents in advance and the stability for improving whole plate hardness.
Description
Technical field
The present invention relates to special thick structural alloy steel technical field of heat treatment, and in particular to a kind of special thick alloy structure
The process for quenching that steel different medium is alternately cooled.
Technical background
In 3077 structural alloy steels of GB/T CrMn CrMnMo CrNiMo CrMnNiMo CrNiMoV steel series requirement
Workpiece walks quenching+tempering technique to improve its obdurability and hardness, and such steel grade crack sensitivity is strong, and quenching process is more using oil
As hardening media reduce the pre- crack resistence of cooling rate, but with workpiece used in construction machinery industry to variation and maximization develop,
Especially for some special thick super large substance steel plates, using oil quenching it is of high cost, do not possess big working condition and steel plate hardness is uniform
Sexual deviation, therefore, there is an urgent need for optimization quenching technical to meet the needs of high-carbon high-alloy super-thick steel plate stable mass production.
The content of the invention
To solve the above problems, be alternately cooled the object of the present invention is to provide a kind of special thick structural alloy steel different medium
Process for quenching, on the premise of ensureing to accelerate cooling procedure light plate quenching degree to improve hardness, it is cooled can to significantly reduce its
Thermal stress and structural stress in journey, thick structural alloy steel hardening break of effectively guarding against enemy agents in advance and the stability for improving whole plate hardness.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：A kind of special thick structural alloy steel different medium alternating
The process for quenching of cooling, it is characterised in that comprise the following steps：
1）The thick structural alloy steel of spy by high-temperature heating complete austenitizing is quickly put into quenching bath and accelerates cooling, when entering water
850-860 DEG C of surface of steel plate temperature, 30-50 DEG C of quenching bath water temperature when entering water；
2）Step 1）In enter the water cooling first stage：The water surface is hung out after entering water cooling 100 seconds, is cooled down 300 seconds in atmosphere, it is cold
But process light plate red temperature is 580-600 DEG C；
3）Step 1）In enter water cooling second stage：The water surface is hung out after entering water rapid cooling 150 seconds to cool down in atmosphere, cooling procedure
Light plate red temperature is 490-520 DEG C.
Preferably, step 1）In 40 DEG C of quenching bath water temperature when entering water.
Step 2）Middle cooling procedure light plate red temperature is 590 DEG C.
Step 2）Middle cooling procedure light plate red temperature is 500 DEG C.
The beneficial effects of the invention are as follows：Quenching bath water temperature is controlled at 30-50 DEG C, it is therefore an objective to drop by improving quenching liquid temperature
Low cooling velocity, prevents quenching structure stress is excessive from causing to crack；Pass through first stage water cooling+air-cooled+second stage water cooling+sky
It is cold, in water with quenching is alternately cooled in air can effectively prevent surface in super-thick steel plate Cooling Process, center portion excessive temperature differentials
Produce thermal stress and structural stress concentrates caused cracking.
Embodiment
With reference to embodiment, the technical characteristic of the present invention is further described.
By taking structural alloy steel 42CrMo as an example, 30-40 tons of substance, thickness 300-400mm steel plates load exterior mechanization stove
The acceleration cooling of quenching pond, surface of steel plate temperature when entering water are quickly put into by overhead traveling crane handling after carrying out high-temperature heating complete austenitizing
850-860 DEG C of degree, the control of quenching bath water temperature is at 40 DEG C when entering water.Steel plate enters water rapid cooling and is divided into two stages, and the first stage enters water
Cooling hangs out the water surface air-cooled 300 seconds after 100 seconds, and 590 DEG C of red temperature is cooled down in air；Second stage enters water rapid cooling and hangs for 150 seconds
Go out air-cooled, 510 DEG C of red temperature.Two key points of operating process：First, 30-50 DEG C of quenching bath water temperature, purpose are controlled in advance
It is to prevent quenching structure stress is excessive from causing to crack by improving quenching liquid temperature reduction cooling rate；Second, pass through first stage water cooling
+ air-cooled+second stage water cooling+air-cooled, surface, the heart in super-thick steel plate Cooling Process can be effectively prevented by the empty alternately quenching of water
Portion's excessive temperature differentials produces thermal stress and structural stress concentrates caused cracking.Whole plate hardness is substantially improved after quenching, subsequently needs
Hardness is adjusted to the scope of application by tempering process.
Implementation recited above is only that patent working mode of the present invention is described, and is set not departing from patent of the present invention
On the premise of counting thought, various modifications and improvement that those skilled in the art make patent formula of the present invention should all
Belong to the protection domain of patent of the present invention.
Claims (4)
1. the process for quenching that a kind of special thick structural alloy steel different medium is alternately cooled, it is characterised in that comprise the following steps：
1）The thick structural alloy steel of spy by high-temperature heating complete austenitizing is quickly put into quenching bath and accelerates cooling, when entering water
850-860 DEG C of surface of steel plate temperature, 30-50 DEG C of quenching bath water temperature when entering water；
2）Step 1）In enter the water cooling first stage：The water surface is hung out after entering water cooling 100 seconds, is cooled down 300 seconds in atmosphere, it is cold
But process light plate red temperature is 580-600 DEG C；
3）Step 1）In enter water cooling second stage：The water surface is hung out after entering water rapid cooling 150 seconds to cool down in atmosphere, cooling procedure
Light plate red temperature is 490-520 DEG C.
2. the process for quenching that special thick structural alloy steel different medium according to claim 1 is alternately cooled, it is characterised in that：
Step 1）In 40 DEG C of quenching bath water temperature when entering water.
3. the process for quenching that special thick structural alloy steel different medium according to claim 1 is alternately cooled, it is characterised in that：
Step 2）Middle cooling procedure light plate red temperature is 590 DEG C.
4. the process for quenching that special thick structural alloy steel different medium according to claim 1 is alternately cooled, it is characterised in that：
Step 2）Middle cooling procedure light plate red temperature is 500 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711364179.9A CN107937672A (en) | 2017-12-18 | 2017-12-18 | The process for quenching that a kind of special thick structural alloy steel different medium is alternately cooled |
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| CN201711364179.9A CN107937672A (en) | 2017-12-18 | 2017-12-18 | The process for quenching that a kind of special thick structural alloy steel different medium is alternately cooled |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108707727A (en) * | 2018-06-15 | 2018-10-26 | 山西北方机械制造有限责任公司 | 42CrMo round steel heat treatment process |
| CN108866285A (en) * | 2018-09-11 | 2018-11-23 | 武钢集团襄阳重型装备材料有限公司 | A kind of heavy die block mould steel Tempering and Quenching method |
| CN108907631A (en) * | 2018-08-23 | 2018-11-30 | 江苏华太电力仪表有限公司 | A kind of preparation process of high temperature resistant leakage-free ball valve spool |
| CN109161644A (en) * | 2018-09-11 | 2019-01-08 | 武钢集团襄阳重型装备材料有限公司 | A kind of heavy die block mould steel process for quenching |
| CN111424139A (en) * | 2020-05-28 | 2020-07-17 | 江苏联峰实业有限公司 | Quenching method for alternately cooling alloy structural steel |
| CN112430721A (en) * | 2020-11-03 | 2021-03-02 | 成都先进金属材料产业技术研究院有限公司 | Solution heat treatment method for preventing blade steel 0Cr17Ni4Cu4Nb from cracking |
| CN113665223A (en) * | 2021-09-01 | 2021-11-19 | 苏州金纬片板膜智能装备有限公司 | Internal stress eliminating method and device for waterproof coiled material |
| CN114410894A (en) * | 2021-12-28 | 2022-04-29 | 舞阳钢铁有限责任公司 | Method for reducing quenching cracks of 12Cr2Mo1VR steel |
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| CN102409144A (en) * | 2011-11-30 | 2012-04-11 | 东北特殊钢集团有限责任公司 | Continuous type alloy steel heat treatment line |
| CN103421940A (en) * | 2013-09-05 | 2013-12-04 | 中原特钢股份有限公司 | Technological method for AISI4140 and AISI 4340 constructional steel forged piece quenching and tempering through one-time thermal cycling |
| CN103643156A (en) * | 2013-11-21 | 2014-03-19 | 江苏天舜金属材料集团有限公司 | More than 630 MPa level high strength steel bar and application method thereof in reinforced concrete |
| CN107190129A (en) * | 2017-06-09 | 2017-09-22 | 贵州高峰石油机械股份有限公司 | A kind of Technology for Heating Processing of the solid drill steel of structural alloy steel |
| CN107385353A (en) * | 2017-06-19 | 2017-11-24 | 江阴兴澄特种钢铁有限公司 | A kind of ocean platform special thick EH36 steel plates of 250mm and preparation method thereof |
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2017
- 2017-12-18 CN CN201711364179.9A patent/CN107937672A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102409144A (en) * | 2011-11-30 | 2012-04-11 | 东北特殊钢集团有限责任公司 | Continuous type alloy steel heat treatment line |
| CN103421940A (en) * | 2013-09-05 | 2013-12-04 | 中原特钢股份有限公司 | Technological method for AISI4140 and AISI 4340 constructional steel forged piece quenching and tempering through one-time thermal cycling |
| CN103643156A (en) * | 2013-11-21 | 2014-03-19 | 江苏天舜金属材料集团有限公司 | More than 630 MPa level high strength steel bar and application method thereof in reinforced concrete |
| CN107190129A (en) * | 2017-06-09 | 2017-09-22 | 贵州高峰石油机械股份有限公司 | A kind of Technology for Heating Processing of the solid drill steel of structural alloy steel |
| CN107385353A (en) * | 2017-06-19 | 2017-11-24 | 江阴兴澄特种钢铁有限公司 | A kind of ocean platform special thick EH36 steel plates of 250mm and preparation method thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108707727A (en) * | 2018-06-15 | 2018-10-26 | 山西北方机械制造有限责任公司 | 42CrMo round steel heat treatment process |
| CN108907631A (en) * | 2018-08-23 | 2018-11-30 | 江苏华太电力仪表有限公司 | A kind of preparation process of high temperature resistant leakage-free ball valve spool |
| CN108866285A (en) * | 2018-09-11 | 2018-11-23 | 武钢集团襄阳重型装备材料有限公司 | A kind of heavy die block mould steel Tempering and Quenching method |
| CN109161644A (en) * | 2018-09-11 | 2019-01-08 | 武钢集团襄阳重型装备材料有限公司 | A kind of heavy die block mould steel process for quenching |
| CN111424139A (en) * | 2020-05-28 | 2020-07-17 | 江苏联峰实业有限公司 | Quenching method for alternately cooling alloy structural steel |
| CN112430721A (en) * | 2020-11-03 | 2021-03-02 | 成都先进金属材料产业技术研究院有限公司 | Solution heat treatment method for preventing blade steel 0Cr17Ni4Cu4Nb from cracking |
| CN113665223A (en) * | 2021-09-01 | 2021-11-19 | 苏州金纬片板膜智能装备有限公司 | Internal stress eliminating method and device for waterproof coiled material |
| CN114410894A (en) * | 2021-12-28 | 2022-04-29 | 舞阳钢铁有限责任公司 | Method for reducing quenching cracks of 12Cr2Mo1VR steel |
| CN114410894B (en) * | 2021-12-28 | 2023-08-22 | 舞阳钢铁有限责任公司 | Method for reducing quenching cracks of 12Cr2Mo1VR steel |
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Application publication date: 20180420 |