CN105063292A - Thermal treatment method for 35CrNi3MoV steel - Google Patents
Thermal treatment method for 35CrNi3MoV steel Download PDFInfo
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- CN105063292A CN105063292A CN201510521884.XA CN201510521884A CN105063292A CN 105063292 A CN105063292 A CN 105063292A CN 201510521884 A CN201510521884 A CN 201510521884A CN 105063292 A CN105063292 A CN 105063292A
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Abstract
A thermal treatment method for 35CrNi3MoV steel is characterized in that a two-phase-region normalizing process is used, and the thermal treatment method particularly comprises the following steps of subjecting workpieces to air cooling to the temperature of 600-650 DEG C after forging, putting the air-cooled workpieces into a thermal treatment furnace, and preserving heat for 5-7 h; carrying out furnace cooling to the temperature of 300-350 DEG C at the speed of 20-30 DEG C/h after heat preserving and preserving heat for 8-10 h; raising the temperature to 660-680 DEG C at the speed of 40-60 DEG C/h after heat preserving and preserving heat for 3-5 h; raising the temperature to 960-980 DEG C at the speed of 80-100 DEG C/h after heat preserving and preserving heat for 8-10 h; performing air cooling to reduce the temperature to 300-350 DEG C after heat preserving and preserving heat for 8-10 h; raising the temperature to 760-790 DEG C at the speed of 80-100 DEG C/h after heat preserving and preserving heat for 8-10 h; performing air cooling to reduce the temperature to 300-350 DEG C after heat preserving; performing furnace cooling to the temperature of 650 DEG C at the speed of 20-30 DEG C/h after air cooling and preserving heat for 30-40 h; and performing furnace cooling to the temperature below 300 DEG C at the speed of 20-30 DEG C/h after heat preserving and taking samples to detect the grain size. According to the thermal treatment method, the problem that most structures of alloy steel after forging are coarse grain structures is solved.
Description
Technical field
The present invention relates to a kind of metal heat treating methods, especially a kind of 35CrNi3MoV Heat Treatment Of Steel method.
Background technology
35CrNi3MoV structural alloy steel, it has good comprehensive mechanical property, can be used for the forging manufacturing high-strong toughness.In process of production, after the forging of steel alloy structure, tissue mostly is open grain structure, and tissue heredity is extremely strong.If directly carry out finished heat treatment after forging will retain original coarse-grain state because of Structure Inheritance, not only make the mechanical properties decrease of material, and thick crystal grain can affect the accuracy of UT (Ultrasonic Testing), hinder the detection of inside workpiece defect.
Summary of the invention
The invention provides a kind of heat treating method of steel alloy to solve the problem, after solving alloy steel forging, tissue mostly is the problem of open grain structure.
Concrete scheme of the present invention is:
A kind of 35CrNi3MoV Heat Treatment Of Steel method, is characterized in that adopting two-phase region normalizing process, specifically includes following steps:
1) after having forged, workpiece air cooling is put into heat treatment furnace to 600-650 DEG C and is incubated 5-7h;
2) insulation is chilled to 300-350 DEG C with the speed stove of 20-30 DEG C/h and is incubated 8-10h after terminating;
3) insulation is warming up to 660-680 DEG C with the speed of 40-60 DEG C/h after terminating and is incubated 3-5h;
4) insulation is warming up to 960-980 DEG C with the speed of 80-100 DEG C/h after terminating and is incubated 8-10h;
5) insulation terminates rear air cooling to 300-350 DEG C, and is incubated 8-10h;
6) insulation rises to 760-790 DEG C of insulation 8-10h with the speed of 80-100 DEG C/h after terminating;
7) insulation terminates rear air cooling to 300-350 DEG C;
8) air cooling is chilled to 650 DEG C with 20-30 DEG C of stove and is incubated 30-40h after terminating;
9) insulation is chilled to less than 300 DEG C with the speed stove of 20-30 DEG C/h after terminating.
10) sampling inspection grain fineness number
Above-mentioned steps 1) forged after workpiece air cooling to 620 DEG C put into heat treatment furnace and be incubated 6h.
Above-mentioned steps 2) insulation terminate after with the speed stove of 25 DEG C/h be chilled to 330 DEG C insulation 9h.
Above-mentioned steps 3) insulation is warming up to 670 DEG C with the speed of 50 DEG C/h after terminating and is incubated 4h.
Above-mentioned steps 4) insulation is warming up to 970 DEG C with the speed of 90 DEG C/h after terminating and is incubated 9h.
Above-mentioned steps 5) be incubated and terminate rear air cooling to 320 DEG C, and at 320 DEG C of insulation 9h.
Above-mentioned steps 6) insulation terminate after with the speed of 90 DEG C/h rise to 780 DEG C insulation 9h.
Above-mentioned steps 7) be incubated and terminate rear air cooling to 350 DEG C.
Above-mentioned steps 8) air cooling is warming up to 650 DEG C with 25 DEG C and is incubated 35h after terminating.
Above-mentioned steps 9) insulation terminate after be chilled to 100-300 DEG C with the speed stove of 25 DEG C/h.
Step (10) sampling inspection grain fineness number
The present invention adopts two-phase region normalizing process, and after solving a kind of alloy steel forging, tissue mostly is the problem of open grain structure.
Embodiment
Embodiment composition is as follows
| C | Si | Mn | P | S | Cr | Mo | Ni | Cu |
| 0.35 | 0.29 | 0.71 | 0.007 | 0.006 | 1.37 | 0.41 | 3.15 | 0.05 |
For 35CrNi3MoV steel, its Ac1 is 740 DEG C, and Ac3 is 790 DEG C.
Embodiment 1 adopts two-phase region normalizing process
Workpiece air cooling to 620 DEG C is put into heat treatment furnace after having forged and is incubated 6h by step (1).
330 DEG C of insulation 9h are chilled to the speed stove of 25 DEG C/h after step (2) insulation terminates.
Be warming up to 670 DEG C with the speed of 50 DEG C/h after step (3) insulation terminates and be incubated 4h.
Be warming up to 970 DEG C with the speed of 90 DEG C/h after step (4) insulation terminates and be incubated 9h.
Step (5) insulation terminates rear air cooling to 320 DEG C, and at 320 DEG C of insulation 9h.
780 DEG C of insulation 9h are risen to the speed of 90 DEG C/h after step (6) insulation terminates.
Step (7) insulation terminates below rear air cooling to 350 DEG C.
Be chilled to 650 DEG C with 25 DEG C of stoves and be incubated 35h after step (8) air cooling terminates.
200 DEG C are chilled to the speed stove of 25 DEG C/h after step (9) insulation terminates.
Step (10) sampling inspection grain fineness number
Sampling inspection grain fineness number is 7 grades.
Embodiment 2 adopts two-phase region normalizing process
Workpiece air cooling to 620 DEG C is put into heat treatment furnace after having forged and is incubated 6h by step (1).
330 DEG C of insulation 9h are chilled to the speed stove of 25 DEG C/h after step (2) insulation terminates.
Be warming up to 670 DEG C with the speed of 50 DEG C/h after step (3) insulation terminates and be incubated 4h.
Be warming up to 970 DEG C with the speed of 90 DEG C/h after step (4) insulation terminates and be incubated 9h.
Step (5) insulation terminates below rear air cooling to 320 DEG C, and at 320 DEG C of insulation 9h.
790 DEG C of insulation 8h are risen to the speed of 100 DEG C/h after step (6) insulation terminates.
Step (7) insulation terminates rear air cooling to 350 DEG C.
Be chilled to 650 DEG C with 25 DEG C of stoves and be incubated 35h after step (8) air cooling terminates.
200 DEG C are chilled to the speed stove of 25 DEG C/h after step (9) insulation terminates.
Step (10) sampling inspection grain fineness number
Sampling inspection grain fineness number is 7 grades.
Embodiment 3 adopts two-phase region normalizing process
Workpiece air cooling to 620 DEG C is put into heat treatment furnace after having forged and is incubated 6h by step (1).
330 DEG C of insulation 9h are chilled to the speed stove of 25 DEG C/h after step (2) insulation terminates.
Be warming up to 670 DEG C with the speed of 50 DEG C/h after step (3) insulation terminates and be incubated 4h.
Be warming up to 970 DEG C with the speed of 90 DEG C/h after step (4) insulation terminates and be incubated 9h.
Step (5) insulation terminates below rear air cooling to 320 DEG C, and at 320 DEG C of insulation 9h.
760 DEG C of insulation 8h are risen to the speed of 80 DEG C/h after step (6) insulation terminates.
Step (7) insulation terminates rear air cooling to 350 DEG C.
Be chilled to 650 DEG C with 25 DEG C of stoves and be incubated 35h after step (8) air cooling terminates.
200 DEG C are chilled to the speed stove of 25 DEG C/h after step (9) insulation terminates.
Step (10) sampling inspection grain fineness number
Sampling inspection grain fineness number is 7 grades.
Embodiment 4 adopts common normalizing process
Workpiece air cooling to 620 DEG C is put into heat treatment furnace after having forged and is incubated 6h by step (1).
330 DEG C of insulation 9h are chilled to the speed stove of 25 DEG C/h after step (2) insulation terminates.
Be warming up to 670 DEG C with the speed of 50 DEG C/h after step (3) insulation terminates and be incubated 4h.
Be warming up to 970 DEG C with the speed of 90 DEG C/h after step (4) insulation terminates and be incubated 9h.
Step (5) insulation terminates rear air cooling to 320 DEG C, and at 320 DEG C of insulation 9h.
880 DEG C of insulation 10h are risen to the speed of 90 DEG C/h after step (6) insulation terminates.
Be chilled to 650 DEG C with 25 DEG C of stoves and be incubated 35h after step (7) air cooling terminates.
200 DEG C are chilled to the speed stove of 25 DEG C/h after step (8) insulation terminates.
Step (9) sampling inspection grain fineness number
Sampling inspection grain fineness number is 6 grades about 25% is 1-2 level.
Claims (10)
1. a 35CrNi3MoV Heat Treatment Of Steel method, is characterized in that adopting two-phase region normalizing process, specifically includes following steps:
1) after having forged, workpiece air cooling is put into heat treatment furnace to 600-650 DEG C and is incubated 5-7h;
2) insulation is chilled to 300-350 DEG C with the speed stove of 20-30 DEG C/h and is incubated 8-10h after terminating;
3) insulation is warming up to 660-680 DEG C with the speed of 40-60 DEG C/h after terminating and is incubated 3-5h;
4) insulation is warming up to 960-980 DEG C with the speed of 80-100 DEG C/h after terminating and is incubated 8-10h;
5) insulation terminates rear air cooling to less than 300-350 DEG C, and is incubated 8-10h;
6) insulation rises to 760-790 DEG C of insulation 8-10h with the speed of 80-100 DEG C/h after terminating;
7) insulation terminates rear air cooling to 300-350 DEG C;
8) air cooling is chilled to 650 DEG C with 20-30 DEG C of stove and is incubated 30-40h after terminating;
9) insulation is chilled to 100-300 DEG C with the speed stove of 20-30 DEG C/h after terminating.
2. 35CrNi3MoV Heat Treatment Of Steel method according to claim 1, is characterized in that above-mentioned steps 1) forged after workpiece air cooling to 620 DEG C put into heat treatment furnace and be incubated 6h.
3. 35CrNi3MoV Heat Treatment Of Steel method according to claim 1, is characterized in that above-mentioned steps 2) insulation terminate after with the speed stove of 25 DEG C/h be chilled to 330 DEG C insulation 9h.
4. 35CrNi3MoV Heat Treatment Of Steel method according to claim 1, is characterized in that above-mentioned steps 3) insulation is warming up to 670 DEG C with the speed of 50 DEG C/h after terminating and is incubated 4h.
5. 35CrNi3MoV Heat Treatment Of Steel method according to claim 1, is characterized in that above-mentioned steps 4) insulation is warming up to 970 DEG C with the speed of 90 DEG C/h after terminating and is incubated 9h.
6. 35CrNi3MoV Heat Treatment Of Steel method according to claim 1, is characterized in that above-mentioned steps 5) be incubated and terminate rear air cooling to 320 DEG C, and at 320 DEG C of insulation 9h.
7. 35CrNi3MoV Heat Treatment Of Steel method according to claim 1, is characterized in that above-mentioned steps 6) insulation terminate after with the speed of 90 DEG C/h rise to 780 DEG C insulation 9h.
8. 35CrNi3MoV Heat Treatment Of Steel method according to claim 1, is characterized in that above-mentioned steps 7) be incubated and terminate rear air cooling to 350 DEG C.
9. 35CrNi3MoV Heat Treatment Of Steel method according to claim 1, is characterized in that above-mentioned steps 8) air cooling is chilled to 650 DEG C with 25 DEG C of stoves and is incubated 35h after terminating.
10. 35CrNi3MoV Heat Treatment Of Steel method according to claim 1, is characterized in that above-mentioned steps 9) insulation terminate after be chilled to 200 DEG C with the speed stove of 25 DEG C/h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105755236A (en) * | 2016-03-07 | 2016-07-13 | 江苏大学 | Method for improving low temperature impact toughness of 35CrNi3MoV steel forgings |
| CN113322368A (en) * | 2021-05-26 | 2021-08-31 | 河南中原特钢装备制造有限公司 | Manufacturing method for eliminating overheating of 35CrNi3MoV large-scale cylinder forging |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103789686A (en) * | 2014-02-27 | 2014-05-14 | 中国科学院金属研究所 | Heat treatment process for eliminating steel mixed crystal and coarse crystal structures for hydrogenation reactor |
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2015
- 2015-08-24 CN CN201510521884.XA patent/CN105063292A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789686A (en) * | 2014-02-27 | 2014-05-14 | 中国科学院金属研究所 | Heat treatment process for eliminating steel mixed crystal and coarse crystal structures for hydrogenation reactor |
Non-Patent Citations (10)
| Title |
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| 30Cr2Ni4MoV钢低压转子热处理工艺的研究;陈睿恺;《中国博士学位论文全文数据库 工程科技I辑》;20121215;第165-171，184-186页 * |
| 35CrNi3MoV钢组织遗传消除工艺研究;钟斌;《大型锻铸件》;20070930(第5期);第3-5,8页 * |
| 一种可细化晶粒提高中碳铬镍钼（钒）钢强韧性的正火工艺;李连贵;《大型锻铸件》;20011231(第1期);第20-22页 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105755236A (en) * | 2016-03-07 | 2016-07-13 | 江苏大学 | Method for improving low temperature impact toughness of 35CrNi3MoV steel forgings |
| CN113322368A (en) * | 2021-05-26 | 2021-08-31 | 河南中原特钢装备制造有限公司 | Manufacturing method for eliminating overheating of 35CrNi3MoV large-scale cylinder forging |
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Application publication date: 20151118 |
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