CN109182704A - A kind of preparation method of the pressure vessel strong steel alloy 21CrMoV5-11 forging circle of heat - Google Patents
A kind of preparation method of the pressure vessel strong steel alloy 21CrMoV5-11 forging circle of heat Download PDFInfo
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- CN109182704A CN109182704A CN201811390950.4A CN201811390950A CN109182704A CN 109182704 A CN109182704 A CN 109182704A CN 201811390950 A CN201811390950 A CN 201811390950A CN 109182704 A CN109182704 A CN 109182704A
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- forging
- temperature
- circle
- cooled
- air
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Classifications
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
Abstract
A kind of preparation method of the pressure vessel strong steel alloy 21CrMoV5-11 forging circle of heat.Belong to steel alloy forging processing technique field, this method is that steel ingot repeatedly heats up to be heated to 1180~1220 DEG C, the forging and forming at 1200~800 DEG C, air-cooled 20~50min, then buries sand, air-cooled；Oil quenching is air-cooled again at 900 ± 10 DEG C, is tempered at 620~680 DEG C, and 300 DEG C are furnace-cooled to after tempering hereinafter, then coming out of the stove is air-cooled to room temperature.The quenched forging circle of 21CrMoV5-11 steel alloy produced using this method, 500 DEG C of yield strength >=450MPa, elongation percentage >=20%, 20 DEG C ballistic work KV >=120J, hardness 235-285HB can fully meet the related request of client.
Description
Technical field
This invention belongs to steel alloy forging processing technique field, and in particular to a kind of strong steel alloy of pressure vessel heat
The preparation method of 21CrMoV5-11 forging circle.
Background technique
21CrMoV5-11 is a kind of structural alloy steel of German trade mark, is mainly used for the molding and system of high temperature pressure vessel
Make, belong to a kind of strong steel alloy of pressure vessel heat, can at a temperature of 530 DEG C safe and stable operation, be therefore widely used in
In the device fabrications of industries such as petrochemical industry, coal gasification conversion, nuclear power, steam turbine cylinder, thermoelectricity, and can be with corrosive medium
Occasion in use, so also obtained in the manufacture of the classes equipment such as boiler, reactor, heater, steam generator extensively
Using.When this steel grade is ordered as the raw material of device fabrication, terms of delivery are quality adjustment conditions, therefore its mechanical behavior under high temperature
It is not easy qualification.
For this purpose, this invention selects to need 21CrMoV5-11 steel alloy as processing object, and using it as raw material, exploitation
A kind of reasonable production technology has the steel alloy that higher mechanical behavior under high temperature requires to manufacture this requirement.
Summary of the invention
The present invention relates to a kind of pressure vessel preparation method of the strong steel alloy 21CrMoV5-11 forging circle of heat, prepared by this kind
Method or process route include Heating Steel Ingots, forging and forming, Tempering and Quenching, specifically following steps are taken to be manufactured:
1) heating heating.By Heating Steel Ingots to 600~750 DEG C, 1.5~4.5 hours are kept the temperature, is then heated to 800~850
DEG C, 0.5~2.5 hour is kept the temperature, malleable 1180~1220 DEG C are again heated to, then 3~6.5 hours is kept the temperature, makes the table of steel ingot
Face and internal temperature are almost the same, and austenite reaches homogenization；
2) forging and forming.The steel ingot heated that will heat up, which is hoisted to, to be started to forge and press at forging press, is first forged as side
Shape presses its rib afterwards, and finally pressure is circle, controls ratio of forging reduction in 2:1~4:1, range of the controlled forge process temperature at 1200~800 DEG C
Within；In hot forging process, iron oxide is attached to red steel surface, is in patch shape, puts sheet, will lead to red steel surface under stress
Pit, or even generate micro-crack.Meanwhile the steel surface iron scale not removed can reduce heat in follow-up heat treatment process
Conduction efficiency influences the uniformity of heat treatment.Therefore the present invention is in forging process, using designed forging circle iron oxide in advance
Scavenging machine continuously removes the iron oxide on red heat forging stock surface, reaches the smooth no attachment in surface, greatly improved with this forged it is red
It is hot-forged base surface quality, creates suitable condition for subsequent heat treatment.
3) slow cooling after forging.Forging circle after forging and forming is placed in air 20~50min of hollow cold, sand is then buried, when in sand
Forging circle temperature shake out when being reduced to≤150 DEG C it is air-cooled.
4) high temperature quenches.In order to reduce the deformation and tearing tendency of workpiece, to forging circle carry out high temperature quenching treatment, selection with
Oily Dai Shui is as hardening media, and 900 ± 10 DEG C of hardening heat, the forging for burying the air-cooled mistake of sand circle is heated to 900 ± 10 DEG C when work,
Soaking time t is related with forging circular diameter D size, and t=1.0~2.0 (min/mm) × D (mm) is subsequently placed in oil medium and quenches
Processing, the oil temperature general control before quenching is at 60 DEG C~80 DEG C, cool time t=30~60min, then natural air cooling.
5) high tempering.Quenched forging circle is placed to heating in tempering heating furnace and is heated to tempering temperature 620~680
DEG C, and keeping temperature-resistant, the retention time t of tempering is related with forging circular diameter D, t=2.0~2.5 (min/mm) X D
(mm), 300 DEG C are furnace-cooled to hereinafter, then coming out of the stove is air-cooled to room temperature after the tempering of forging circle.
Outstanding feature of the invention is:
(1) key component C element content is improved, the range of general case C is 0.19~0.23%, using this invention
Its reality controls C 0.23%~0.25%, and devises quenching+high tempering technological parameter, to meet the product 500
When~600 DEG C of temperature, still there is high yield strength.
(2) product performance index is excellent, 21CrMoV5-11 steel alloy quenched forging circle, meet 500 DEG C of yield strengths >=
450MPa, 20 DEG C of yield strength >=650MPa, elongation percentage >=20%, 20 DEG C of ballistic work KV >=120J, hardness 235-285HB are wanted
It asks, can satisfy the related request that client proposes its performance.
Specific embodiment
Using the forging circle of above-mentioned steel grade production diameter 280mm, choosing steel ingot weight is 5 tons, and steel ingot section average equivalent is straight
Diameter is 580mm, is forged and is heat-treated using this invention method, is specifically manufactured as follows:
1) it heats.By Heating Steel Ingots to 700 DEG C, 2.0 hours are kept the temperature, is then heated to 800 DEG C, keeps the temperature 1.5 hours, then plus
Then heat keeps the temperature 4 hours, keeps the surface and internal temperature of steel ingot almost the same, the austenite in steel ingot to malleable 1220 DEG C
Reach homogenization, then starts to forge and press；
2) it forges and presses.Steel ingot starts to forge and press after being hoisted to forging press, and it is rectangular for first being forged, and presses its rib afterwards, and finally pressure is circle
Shape controls ratio of forging reduction 3.91:1, and controlled forge process temperature is within the scope of 1200~800 DEG C；In hot forging process, justified using forging
Iron oxide scavenging machine, the continuous iron oxide for removing red heat forging stock surface, reaches the smooth no attachment in surface, creates for subsequent heat treatment
Make suitable condition.
3) slow cooling after forging.Air-cooled 30min after forging circle molding shakes out when then burying extremely≤150 DEG C of sand and is air-cooled to room temperature.
4) high temperature quenches.With oil hardening medium for water, hardening heat is 1000 DEG C, when forging circle is heated to 1000 DEG C of heat preservations
Between 5 hours, oil temperature is 60 DEG C, cool time t=30min, then natural air cooling.
5) high tempering.Tempering temperature is 680 DEG C, and time t=1.5 (min/mm) X 283 (mm)=424.5 point determines
It is 7 hours, comes out of the stove again when being cooled to 300 DEG C or less after tempering in furnace air-cooled.
Through detecting, 500 DEG C of yield strengths of the final quenched forging circle of 21CrMoV5-11 steel alloy are=472MPa, 20 DEG C of surrenders
Intensity=660MPa, elongation percentage=26%, 20 DEG C ballistic work KV=125J, hardness=255HB can fully meet client to it
The requirements that performance is proposed.
Claims (1)
1. a kind of pressure vessel preparation method of the strong steel alloy 21CrMoV5-11 forging circle of heat, this kind of preparation method includes steel ingot
Heating, forging and forming, Tempering and Quenching, it is characterised in that specifically following steps is taken to be manufactured:
1) heating heating keeps the temperature 1.5~4.5 hours, is then heated to 800~850 DEG C by Heating Steel Ingots to 600~750 DEG C,
Heat preservation 0.5~2.5 hour is again heated to malleable 1180~1220 DEG C, keeps the temperature 3~6.5 hours, makes the surface and inside of steel ingot
Temperature is almost the same, and austenite reaches homogenization；
2) forging and forming, the steel ingot heated that will heat up, which is hoisted to, to be started to forge and press at forging press, and it is rectangular for first being forged, after
Its rib is pressed, finally pressure is circle, controls ratio of forging reduction in 2:1~4:1, controlled forge process temperature is within the scope of 1200~800 DEG C；
The iron oxide for continuously removing red heat forging stock surface using forging circle iron oxide scavenging machine in hot forging process, it is smooth without attached to reach surface
Object；
3) the forging circle after forging and forming is placed in air 20~50min of hollow cold, sand is then buried, when the forging in sand by slow cooling after forging
Circle temperature is shaked out air-cooled when being reduced to≤150 DEG C；
4) high temperature quenches, and select oil is hardening media, and the forging for burying the air-cooled mistake of sand is justified and is heated to 900 ± 10 DEG C, soaking time t and
Forging circular diameter D size is related, and t=1.0~2.0 (min/mm) X D (mm) is subsequently placed in oil medium and is quenched, before quenching
Oil temperature general control at 60 DEG C~80 DEG C, cool time t=30~60min, then natural air cooling；
5) quenched forging circle is placed to heating in tempering heating furnace and is heated to 620~680 DEG C of tempering temperature by high tempering,
And keep temperature-resistant, the retention time t of tempering is related with forging circular diameter D, t=2.0~2.5 (min/mm) X D (mm),
300 DEG C are furnace-cooled to hereinafter, then coming out of the stove is air-cooled to room temperature after forging circle tempering.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811390950.4A CN109182704A (en) | 2018-11-21 | 2018-11-21 | A kind of preparation method of the pressure vessel strong steel alloy 21CrMoV5-11 forging circle of heat |
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| CN201811390950.4A CN109182704A (en) | 2018-11-21 | 2018-11-21 | A kind of preparation method of the pressure vessel strong steel alloy 21CrMoV5-11 forging circle of heat |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853208A (en) * | 2020-12-31 | 2021-05-28 | 江苏铸鸿锻造有限公司 | High-thermal-stability steel for injection molding machine screw and preparation method thereof |
Citations (1)
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|---|---|---|---|---|
| CN106086691A (en) * | 2016-05-13 | 2016-11-09 | 如皋市宏茂重型锻压有限公司 | A kind of boron micro-alloyed mould steel and preparation technology thereof |
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2018
- 2018-11-21 CN CN201811390950.4A patent/CN109182704A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086691A (en) * | 2016-05-13 | 2016-11-09 | 如皋市宏茂重型锻压有限公司 | A kind of boron micro-alloyed mould steel and preparation technology thereof |
Non-Patent Citations (4)
| Title |
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| 孙玮等: "《中厚板生产900问》", 31 July 2014, 冶金工业出版社 * |
| 张康达等: "《压力容器手册》", 29 February 2000, 中国劳动社会保障出版社 * |
| 王洪明: "《结构钢手册》", 31 August 1985, 河北科学技术出版社 * |
| 陈家祥: "《炼钢常用图表数据手册》", 31 January 2010, 冶金工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853208A (en) * | 2020-12-31 | 2021-05-28 | 江苏铸鸿锻造有限公司 | High-thermal-stability steel for injection molding machine screw and preparation method thereof |
| CN112853208B (en) * | 2020-12-31 | 2022-01-07 | 江苏铸鸿锻造有限公司 | High-thermal-stability steel for injection molding machine screw and preparation method thereof |
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Application publication date: 20190111 |