CN105369023A - Method for refining grains of 2Cr12NiMo1W1V forge piece - Google Patents
Method for refining grains of 2Cr12NiMo1W1V forge piece Download PDFInfo
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- CN105369023A CN105369023A CN201510736420.0A CN201510736420A CN105369023A CN 105369023 A CN105369023 A CN 105369023A CN 201510736420 A CN201510736420 A CN 201510736420A CN 105369023 A CN105369023 A CN 105369023A
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- grains
- refining
- forging
- forge piece
- coarse
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The invention relates to a method for refining grains of a steel forge piece, in particular to a method for refining grains of a 2Cr12NiMo1W1V forge piece. The method aims at solving the problem that according to a 2Cr12NiMo1W1V forge piece product produced through an existing forging process, coarse grains are generated after performance thermal treatment. The temperature is controlled, heating, furnace cooling, air cooling, reheating, oil cooling and tempering are carried out on the forge piece product with the coarse grains, and the thermal treatment process of refining the grains of the 2Cr12NiMo1W1V product with the coarse grains is achieved. According to the method for refining the grains, the grain size of the 2Cr12NiMo1W1V product with the coarse grains can be effectively reduced. The method for refining the grains is used for refining the grains of the steel forge piece.
Description
Technical field
The present invention relates to a kind of thinning method of steel forgings crystal grain.
Background technology
2Cr12NiMo1W1V steel belongs to modified version 12%Cr steel, because this steel series hardening capacity is good, and with the addition of W, V, Mo alloying element, is widely used in the forging such as steam turbine valve disc, lining.In factory's actual production process, extensively occur coarse grains problem, and mostly be mixed crystal, be less than 1 grade of crystal grain and reach 20%, all the other crystal grain are below 3 grades, and technological standard general requirement more than 4 grades or 4 grades.Because this steel grade hardening capacity is strong, Structure Inheritance feature is obvious, and routine repeatedly normalizing treatment, the deformation method for grain refinement such as to be rapidly heated can not thoroughly solve coarse grains problem.
Summary of the invention
The object of the invention is to produce 2Cr12NiMo1W1V product forging in order to solve for existing forging process, occur coarse-grain problem after property heat treatment, a kind of thermal treatment process 2Cr12NiMo1W1V product of coarse-grain can being carried out grain refining is provided.
2Cr12NiMo1W1V forging crystal fining method of the present invention carries out by the following method:
The 2Cr12NiMo1W1V product of coarse-grain is heated to 850 DEG C ~ 880 DEG C, is evenly incubated 2h ~ 4h, then stove is chilled to 150 DEG C ± 10 DEG C, then carries out air cooling to normal temperature; Then, when stove to be heated is warming up to 1040 DEG C ± 10 DEG C, insulation 20min ~ 40min carries out oil cooling to room temperature, 690 DEG C ± 10 DEG C temper.
The present invention is relative to its advantage of prior art: by crystal fining method of the present invention by after occurring after property heat treatment that the forging of coarse-grain problem processes, can effectively this forging of refinement grain fineness number and its grain fineness number reaches 5 grades, meet the technical standards requirement.
Accompanying drawing explanation
Fig. 1 is the SEM figure of the valve disc forging coarse-grain product metallographic structure of steam turbine 2Cr12NiMo1W1V.
Fig. 2 is the SEM figure of the valve disc forging metallographic structure of the steam turbine 2Cr12NiMo1W1V that embodiments of the invention 1 process.
Embodiment
Technical solution of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: a kind of 2Cr12NiMo1W1V forging crystal fining method of present embodiment, is characterized in that the method for this 2Cr12NiMo1W1V forging grain refining is carried out by the following method:
The 2Cr12NiMo1W1V product of coarse-grain is heated to 850 DEG C ~ 880 DEG C, is evenly incubated 2h ~ 4h, then stove is chilled to 150 DEG C ± 10 DEG C, then carries out air cooling to normal temperature; Then, when stove to be heated is warming up to 1040 DEG C ± 10 DEG C, insulation 20min ~ 40min, carries out oil cooling to room temperature, 690 DEG C ± 10 DEG C temper.
Embodiment two: present embodiment and embodiment one unlike, the 2Cr12NiMo1W1V product of coarse-grain is heated to 855 DEG C.Other steps are identical with embodiment one with parameter.
Embodiment three: present embodiment and embodiment one unlike, first time soaking time be 3h.Other steps are identical with embodiment one with parameter.
Embodiment four: present embodiment and embodiment one unlike, stove is chilled to 150 DEG C, then carries out air cooling to normal temperature.Other steps are identical with embodiment one with parameter.
Embodiment five: present embodiment and embodiment one unlike, then when stove is warming up to 1040 DEG C, carry out oil cooling to room temperature.Other steps are identical with embodiment one with parameter.
Embodiment six: present embodiment and embodiment one unlike, second time soaking time is 30min.Other steps are identical with embodiment one with parameter.
Embodiment seven: present embodiment and embodiment one unlike, the temperature of temper is 690 DEG C.Other steps are identical with embodiment one with parameter.
Embodiment 1:
Fig. 1 is a kind of steam turbine 2Cr12NiMo1W1V valve disc forging, and its grain fineness number is: longitudinally, and mixing, wide region, average 1 grade, scope is 00 grade to 3 grades.This coarse-grain forging is heated to 855 DEG C and is evenly incubated 3 hours, then stove is chilled to 150 DEG C, then carries out air cooling to normal temperature; Be warming up to 1040 DEG C with process furnace, insulation 30min carries out oil cooling to room temperature, 690 DEG C of temper.
Fig. 2 shows that the grain fineness number of the 2Cr12NiMo1W1V valve disc forging of the present embodiment process is 5 grades, other room temperature Mechanical test results: Rp0.2 are 794MPa, Rm be 944MPa, A is 17.5%, Z is 50%, HB be 288 and AKU be 20, performance all reaches standard-required.
Claims (7)
1. a 2Cr12NiMo1W1V forging crystal fining method, is characterized in that: the method for this 2Cr12NiMo1W1V forging grain refining is carried out by the following method:
The 2Cr12NiMo1W1V product of coarse-grain is heated to 850 DEG C ~ 880 DEG C, is evenly incubated 2h ~ 4h, then stove is chilled to 150 DEG C ± 10 DEG C, then carries out air cooling to normal temperature; Then be warming up to 1040 DEG C ± 10 DEG C with process furnace, insulation 20min ~ 40min, carries out oil cooling to room temperature, 690 DEG C ± 10 DEG C temper.
2. a kind of 2Cr12NiMo1W1V forging crystal fining method according to claim 1, is characterized in that: the 2Cr12NiMo1W1V product of coarse-grain is heated to 855 DEG C.
3. a kind of 2Cr12NiMo1W1V forging crystal fining method according to claim 1, is characterized in that: soaking time is 3h for the first time.
4. a kind of 2Cr12NiMo1W1V forging crystal fining method according to claim 1, is characterized in that: stove is chilled to 150 DEG C, then carries out air cooling to normal temperature.
5. a kind of 2Cr12NiMo1W1V forging crystal fining method according to claim 1, is characterized in that: then when stove is warming up to 1040 DEG C, carries out oil cooling to room temperature.
6. a kind of 2Cr12NiMo1W1V forging crystal fining method according to claim 1, is characterized in that: second time soaking time is 30min.
7. a kind of 2Cr12NiMo1W1V forging crystal fining method according to claim 1, is characterized in that: the temperature of temper is 690 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510736420.0A CN105369023A (en) | 2015-11-02 | 2015-11-02 | Method for refining grains of 2Cr12NiMo1W1V forge piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510736420.0A CN105369023A (en) | 2015-11-02 | 2015-11-02 | Method for refining grains of 2Cr12NiMo1W1V forge piece |
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| CN105369023A true CN105369023A (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510736420.0A Pending CN105369023A (en) | 2015-11-02 | 2015-11-02 | Method for refining grains of 2Cr12NiMo1W1V forge piece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106119469A (en) * | 2016-06-30 | 2016-11-16 | 山东伊莱特重工股份有限公司 | A kind of Technology for Heating Processing of large forgings crystal grain thinning |
| CN110643791A (en) * | 2019-11-08 | 2020-01-03 | 哈尔滨汽轮机厂有限责任公司 | Heat treatment method for improving endurance strength of 2Cr12NiMo1W1V heat-resistant steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942549A (en) * | 2010-05-27 | 2011-01-12 | 德阳市秦南铸锻钢制造有限公司 | Heat treatment process for adjusting valve disc forge piece of supercritical steam turbine unit |
| CN102732697A (en) * | 2012-06-27 | 2012-10-17 | 西安航空动力股份有限公司 | Method for refining 1Cr10Co6MoVNbN stainless steel forging grains |
| CN103614524A (en) * | 2013-12-09 | 2014-03-05 | 钢铁研究总院 | Heat treatment method for obtaining high durability of martensite heat-resistant steel |
-
2015
- 2015-11-02 CN CN201510736420.0A patent/CN105369023A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101942549A (en) * | 2010-05-27 | 2011-01-12 | 德阳市秦南铸锻钢制造有限公司 | Heat treatment process for adjusting valve disc forge piece of supercritical steam turbine unit |
| CN102732697A (en) * | 2012-06-27 | 2012-10-17 | 西安航空动力股份有限公司 | Method for refining 1Cr10Co6MoVNbN stainless steel forging grains |
| CN103614524A (en) * | 2013-12-09 | 2014-03-05 | 钢铁研究总院 | Heat treatment method for obtaining high durability of martensite heat-resistant steel |
Non-Patent Citations (3)
| Title |
|---|
| 吴承建等: "《金属材料学（第2版）》", 31 August 2009, 北京：冶金工业出版社 * |
| 周晔明等: "12%Cr钢的组织与应力松弛性能", 《机械工程材料》 * |
| 蔡正德: "2Cr12NiMo1W1V汽轮机叶片用钢的热处理实践", 《中国化工装备》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106119469A (en) * | 2016-06-30 | 2016-11-16 | 山东伊莱特重工股份有限公司 | A kind of Technology for Heating Processing of large forgings crystal grain thinning |
| CN110643791A (en) * | 2019-11-08 | 2020-01-03 | 哈尔滨汽轮机厂有限责任公司 | Heat treatment method for improving endurance strength of 2Cr12NiMo1W1V heat-resistant steel |
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Application publication date: 20160302 |