CN105925773A - Heat treatment method for steel - Google Patents

Heat treatment method for steel Download PDF

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Publication number
CN105925773A
CN105925773A CN201610351613.9A CN201610351613A CN105925773A CN 105925773 A CN105925773 A CN 105925773A CN 201610351613 A CN201610351613 A CN 201610351613A CN 105925773 A CN105925773 A CN 105925773A
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CN
China
Prior art keywords
steel
heat treatment
treatment method
hour
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610351613.9A
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Chinese (zh)
Inventor
张斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Auri Special Steel Co Ltd
Original Assignee
Jiangsu Auri Special Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Auri Special Steel Co Ltd filed Critical Jiangsu Auri Special Steel Co Ltd
Priority to CN201610351613.9A priority Critical patent/CN105925773A/en
Publication of CN105925773A publication Critical patent/CN105925773A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34Methods of heating
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/58Oils
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/607Molten salts
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys

Abstract

The invention discloses a heat treatment method for steel. The heat treatment method includes the steps that the steel is heated to 860 DEG C to 880 DEG C, the temperature is kept for 1 hour to 2 hours, and the steel is taken out from a furnace after being subjected to isothermal annealing and general annealing; then the obtained steel is preheated twice, the temperature rises to 1,220 DEG C to 1,280 DEG C and is kept for 0.5 hour to 1 hour, and quenching is conducted; and tempering is conducted immediately after quenching, and tempering is conducted for three times. The steel treated through the heat treatment method is suitable for manufacturing tools; and due to the fact that the steel has good heat hardness and wear resistance and higher strength and toughness, the tools with the high cutting speed can be manufactured, and the cutting tools which can bear the large load and are complex in shape can be manufactured as well.

Description

A kind of heat treatment method of steel
Technical field
The invention belongs to metallurgical technology field, be specifically related to the heat treatment method of a kind of steel.
Background technology
The quenching of steel is that steel is heated to critical temperature Ac3 (sub-eutectoid steel) or a certain temperature of more than Ac1 (hypereutectoid steel) Degree, is incubated a period of time, is allowed to all or part of austenite and melts, then with the cooling rate rapid cooling more than critical cooling rate The Technology for Heating Processing that martensite (or bainite) changes is carried out to below Ms (or isothermal near Ms).Generally also will The solution treatment of the materials such as aluminium alloy, copper alloy, titanium alloy, safety glass or the heat treatment work with quick cooling procedure Skill is referred to as quenching.
The process for quenching of prior art, uses regular solution Quenching Treatment bad, is easily reduced the quality of heat treated article. The Chinese patent of such as Publication No. CN105177229A discloses a kind of steel Technology for Heating Processing, comprises the following steps: A, prepare heat treatment steel;B, Quenching Treatment, hardening heat is 860 DEG C~980 DEG C, keeps 1~2 hour, selects oil Cool down 3~4 minutes;C, temper, low tempering temperatures is 130 DEG C~230 DEG C, continues 5 hours~6 hours;d、 Air-cooled, the steel after tempering are cooled to room temperature.And for example the Chinese patent of Publication No. CN1721558A discloses one The carburizing quenching process of cold-extruded steel, specifically includes: 1) enter furnace temperature 950 DEG C~990 DEG C;2) firing rate 30 DEG C/minute~50 DEG C / point;3) heating and thermal insulation temperature 920 DEG C~980 DEG C;4) temperature retention time 3~11 hours are oozed by force;5) diffusion temperature retention time 2~9 is little Time;6) cooling rate 30 DEG C/time~60 DEG C/h;7) hardening heat 820 DEG C~880 DEG C;8) strong carburizing gesture is 0.95~1.2C%; 9) diffusion carbon potential is 0.7~0.9C%.It is therefore desirable to develop a kind of novel heat treatment method.
Summary of the invention
Goal of the invention: for weak point of the prior art, the invention provides the heat treatment method of a kind of steel.
Technical scheme: the heat treatment method of steel of the present invention, is that heat steel to 860~880 DEG C is incubated 1~2 Hour, come out of the stove after isothermal annealing and general annealing, then through twice preheating, temperature is increased to 1220~1280 DEG C of guarantors Hold 0.5~1 hour, then quench, be tempered immediately after quenching, totally three tempering.Raise when temperature after preheating During to 1220~1280 DEG C, various steel alloys dissolubility in austenite the most slowly increases, but, the time is the longest, meeting Causing crystal grain to grow up, even there will be crystal boundary and dissolve, therefore, the optimum time is 0.5 hour.
Described isothermal annealing is to be incubated 2 hours when being cooled to 720~750 DEG C;The most typically anneal, be cooled to Come out of the stove for less than 550 DEG C.Hardness is 207~225HBW, is organized as sorbite+carbide.
Twice described preheating, preheating is to be warming up to 600~650 DEG C for the first time, is incubated 2 hours;Second time preheating is to rise Temperature, to 800~850 DEG C, keeps 2 hours.Such heating technique can avoid deformation and the cracking caused due to thermal stress.
Described hardening media is the mixture of white oil and sodium salt.Described sodium salt is sodium nitrate and sodium nitrite.Quenching is situated between Each composition in matter: white oil, sodium nitrate, the proportioning of sodium nitrite are 10:1:2.It is organized as martensite+carbon after quenching Compound+retained austenite (25~30%).
Described tempering is carried out three times altogether, and quenched martensite is only played drawing effect by tempering for the first time, cooled in tempering , there is the transformation of retained austenite, produce new internal stress simultaneously in Cheng Zhong.Through second time tempering, thoroughly do not change Retained austenite continues new transformation, produces again new stress.This is accomplished by third time and is tempered, three times of the present invention Tempering be respectively as follows: be for the first time 560 DEG C 1 hour;550 DEG C 1.5 hours for the second time;560 DEG C 1 hour for the third time.Three times The retained austenite of 1~3% is still retained after tempering.By said method, quenching stress can be eliminated, reduce the Ovshinsky scale of construction, Stabilizing tissue, reaches performance requirement.
Beneficial effect: the steel that heat treatment method of the present invention obtains after processing are suitable to make cutter, owing to it has There are good thermohardening, wearability and higher intensity and toughness, are possible not only to make the cutter that cutting speed is higher, and And can manufacture and bear big load, complex-shaped cutting tool.
Detailed description of the invention:
Embodiment 1
Heat steel is incubated 1 hour to 860 DEG C, is cooled to insulation 2 hours when 720 DEG C;The most typically anneal, Being cooled to less than 550 DEG C come out of the stove, then preheating is to be warming up to 600 DEG C for the first time, is incubated 2 hours;Second time preheating is It is warming up to 800 DEG C, keeps 2 hours.Temperature is increased to 1220 DEG C and keeps 0.5 hour, then quenches, and quenching is situated between Matter is white oil and sodium nitrate, the mixture (white oil: sodium nitrate: nitrous acid mass ratio is 10:1:2) of sodium nitrite, quenches Be tempered immediately after fire, for the first time tempering be 560 DEG C 1 hour;Second time is tempered 550 DEG C 1.5 hours;Third time is returned Fire 560 DEG C 1 hour.
Embodiment 2
Heat steel is incubated 1 hour to 860 DEG C, is cooled to insulation 2 hours when 750 DEG C;The most typically anneal, Being cooled to less than 550 DEG C come out of the stove, then preheating is to be warming up to 650 DEG C for the first time, is incubated 2 hours;Second time preheating is It is warming up to 850 DEG C, keeps 2 hours.Temperature is increased to 1220 DEG C and keeps 0.5 hour, then quenches, and quenching is situated between Matter is white oil and sodium nitrate, the mixture (white oil: sodium nitrate: nitrous acid mass ratio is 10:1:2) of sodium nitrite, quenches Be tempered immediately after fire, for the first time tempering be 560 DEG C 1 hour;Second time is tempered 550 DEG C 1.5 hours;Third time is returned Fire 560 DEG C 1 hour.
Embodiment 3
Heat steel is incubated 2 hours to 880 DEG C, is cooled to insulation 2 hours when 720 DEG C;The most typically anneal, Being cooled to less than 550 DEG C come out of the stove, then preheating is to be warming up to 600 DEG C for the first time, is incubated 2 hours;Second time preheating is It is warming up to 800 DEG C, keeps 2 hours.Temperature is increased to 1280 DEG C and keeps 1 hour, then quenches, hardening media For white oil and sodium nitrate, the mixture (white oil: sodium nitrate: nitrous acid mass ratio is 10:1:2) of sodium nitrite, quenching After be tempered immediately, for the first time tempering be 560 DEG C 1 hour;Second time is tempered 550 DEG C 1.5 hours;Third time tempering 560 DEG C 1 hour.
Embodiment 4
Heat steel is incubated 2 hours to 880 DEG C, is cooled to insulation 2 hours when 750 DEG C;The most typically anneal, Being cooled to less than 550 DEG C come out of the stove, then preheating is to be warming up to 650 DEG C for the first time, is incubated 2 hours;Second time preheating is It is warming up to 850 DEG C, keeps 2 hours.Temperature is increased to 1280 DEG C and keeps 1 hour, then quenches, hardening media For white oil and sodium nitrate, the mixture (white oil: sodium nitrate: nitrous acid mass ratio is 10:1:2) of sodium nitrite, quenching After be tempered immediately, for the first time tempering be 560 DEG C 1 hour;Second time is tempered 550 DEG C 1.5 hours;Third time tempering 560 DEG C 1 hour.
Steel obtained by above-mentioned are carried out Mechanics Performance Testing, and acquired results is as follows:

Claims (7)

1. the heat treatment method of steel, it is characterised in that heat steel to 860~880 DEG C is incubated 1~2 hour, Come out of the stove after isothermal annealing and general annealing, then through twice preheating, temperature is increased to 1220~1280 DEG C and keeps 0.5~1 Hour, then quench, be tempered immediately after quenching, totally three tempering.
2. heat treatment method as claimed in claim 1, it is characterised in that described isothermal annealing is to be cooled to It is incubated 2 hours when 720~750 DEG C;The most typically anneal, be cooled to less than 550 DEG C and come out of the stove.
3. heat treatment method as claimed in claim 1, it is characterised in that twice described preheating, preheating for the first time is It is warming up to 600~650 DEG C, is incubated 2 hours;Second time preheating is to be warming up to 800~850 DEG C, keeps 2 hours.
4. heat treatment method as claimed in claim 1, it is characterised in that described hardening media is white oil and sodium salt Mixture.
5. heat treatment method as claimed in claim 1, it is characterised in that described sodium salt is sodium nitrate and sodium nitrite.
6. heat treatment method as claimed in claim 4, it is characterised in that white oil, sodium nitrate, the proportioning of sodium nitrite For 10:1:2.
7. heat treatment method as claimed in claim 1, it is characterised in that three times described tempering, are 560 DEG C for the first time 1 hour;550 DEG C 1.5 hours for the second time;560 DEG C 1 hour for the third time.
CN201610351613.9A 2016-05-24 2016-05-24 Heat treatment method for steel Pending CN105925773A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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Publications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110373521A (en) * 2019-07-15 2019-10-25 中铁工程装备集团隧道设备制造有限公司 TBM hob cutter ring complex phase strenthen-toughening mechanizm technique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101215628A (en) * 2008-01-11 2008-07-09 北京工业大学 High speed steel composite roller heat treatment method
CN101603149A (en) * 2009-07-28 2009-12-16 攀枝花新钢钒股份有限公司 A kind of low-alloy high-speed steel
CN102430582A (en) * 2011-12-29 2012-05-02 河北津西钢铁集团大方重工科技有限公司 Roll sleeve of ultra-strong wear-resistant high alloy steel roll squeezer and manufacturing method roll sleeve
CN102719627A (en) * 2012-07-04 2012-10-10 中原特钢股份有限公司 Heat treatment method of high-chromium martensitic stainless steel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101215628A (en) * 2008-01-11 2008-07-09 北京工业大学 High speed steel composite roller heat treatment method
CN101603149A (en) * 2009-07-28 2009-12-16 攀枝花新钢钒股份有限公司 A kind of low-alloy high-speed steel
CN102430582A (en) * 2011-12-29 2012-05-02 河北津西钢铁集团大方重工科技有限公司 Roll sleeve of ultra-strong wear-resistant high alloy steel roll squeezer and manufacturing method roll sleeve
CN102719627A (en) * 2012-07-04 2012-10-10 中原特钢股份有限公司 Heat treatment method of high-chromium martensitic stainless steel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
崔忠圻等主编: "《金属学与热处理》", 31 May 2007, 机械工业出版社 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110373521A (en) * 2019-07-15 2019-10-25 中铁工程装备集团隧道设备制造有限公司 TBM hob cutter ring complex phase strenthen-toughening mechanizm technique

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Application publication date: 20160907

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