CN106367567B - A kind of method that CrNiMo quenched and tempered steel uses coal gas annealing furnace soft annealing - Google Patents
A kind of method that CrNiMo quenched and tempered steel uses coal gas annealing furnace soft annealing Download PDFInfo
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- CN106367567B CN106367567B CN201611071358.9A CN201611071358A CN106367567B CN 106367567 B CN106367567 B CN 106367567B CN 201611071358 A CN201611071358 A CN 201611071358A CN 106367567 B CN106367567 B CN 106367567B
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- quenched
- crnimo
- tempered steel
- annealing
- coal gas
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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
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
-
- 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
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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)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The present invention relates to the methods that CrNiMo quenched and tempered steel soft annealing technical fields, especially CrNiMo quenched and tempered steel use coal gas annealing furnace soft annealing.A kind of method that CrNiMo quenched and tempered steel uses coal gas annealing furnace soft annealing, CrNiMo quenched and tempered steel is increased to 690 ± 10 DEG C of heat preservation 6h or more in coal gas annealing furnace, then An Zhao≤30 DEG C/h cool to 400 ± 10 DEG C heat preservation 10 hours after furnace cooling to 300 ± 10 DEG C, then it is air-cooled arrive room temperature.The present invention, which consumes the less energy, realizes CrNiMo quenched and tempered steel soft annealings.
Description
Technical field
The present invention relates to CrNiMo quenched and tempered steel soft annealing technical fields, especially CrNiMo quenched and tempered steel is annealed using coal gas
The method of stove soft annealing.
Background technology
CrNiMo quenched and tempered steel is quick forging machine forging product, and coal gas annealing furnace separate unit rank stress relief annealing technique is used after forging,
Hardness is higher after existing stress relief annealing technique annealing, cannot be satisfied user's requirement.
Invention content
The technical problem to be solved by the present invention is to：How CrNiMo quenched and tempered steel hardness is set obviously to drop by once annealing
It is low, avoid double annealing.
The technical solution adopted in the present invention is：A kind of CrNiMo quenched and tempered steel uses the side of coal gas annealing furnace soft annealing
CrNiMo quenched and tempered steel is increased to 690 ± 10 DEG C of heat preservation 6h or more by method in coal gas annealing furnace, then Zhao≤30 DEG C An/h coolings
Furnace cooling is then air-cooled to arrive room temperature to 300 ± 10 DEG C after keeping the temperature 10 hours to 400 ± 10 DEG C.
As a kind of preferred embodiment：400 ± 10 DEG C of then heat preservation 4 hours are increased to when furnace cooling is to 300 ± 10 DEG C again
Furnace cooling is then air-cooled to arrive room temperature to 300 ± 10 DEG C afterwards.
The beneficial effects of the invention are as follows：The present invention, which consumes the less energy, realizes CrNiMo quenched and tempered steel soft annealings.
Specific implementation mode
Embodiment 1
1, the quenched steel forgings of 30CrNiMo8 are justified into 4 a bundle of loading coal gas annealing furnaces, 100 DEG C of annealing furnace initial temperature；
2,100 DEG C per hour of heating rate keep the temperature 6 hours after being warming up to 690 DEG C；
3,10 hours are kept the temperature after cooling to 400 DEG C with 30 DEG C/h；
4, it cuts off the power, forging circle is removed annealing furnace by furnace cooling to after 300 DEG C, in air natural cooling.
The present embodiment CrNiMo quenched and tempered steel soft annealing methods replace separate unit rank destressing using low-temperature insulation step is increased
Annealing, hardness is substantially reduced after annealing, plays bating effect, meets user's requirement.
Embodiment 2
1, the quenched steel forgings of 30CrNiMo8 are justified into 4 a bundle of loading coal gas annealing furnaces, 100 DEG C of annealing furnace initial temperature；
2,100 DEG C per hour of heating rate keep the temperature 6 hours after being warming up to 690 DEG C；
3,10 hours are kept the temperature after cooling to 400 DEG C with 30 DEG C/h；
4, it cuts off the power, furnace cooling is again switched on power supply, 100 DEG C per hour of heating rate is warming up to 400 DEG C to after 300 DEG C
Keep the temperature 4 hours afterwards；
5, it cuts off the power, forging circle is removed annealing furnace by furnace cooling to after 300 DEG C, in air natural cooling.
The present embodiment CrNiMo quenched and tempered steel soft annealing methods replace separate unit rank destressing using low-temperature insulation step is increased
Annealing, then by being warming up to stress relief annealing again after 400 DEG C of heat preservations again, since integrally to increase temperature not high for secondary temperature elevation
It is less to consume the energy.The CrNiMo quenched and tempered steel bating effects handled by the present embodiment are more obvious.
Claims (1)
1. a kind of method that CrNiMo quenched and tempered steel uses coal gas annealing furnace soft annealing, it is characterised in that：By CrNiMo quenched and tempered steel
It is increased to 690 ± 10 DEG C of heat preservation 6h or more in coal gas annealing furnace, then cools to 400 ± 10 DEG C of heat preservations 10 An Zhao≤30 DEG C/h
Furnace cooling is increased to 400 ± 10 DEG C of then heat preservation 4 hours again to 300 ± 10 DEG C after hour when furnace cooling is to 300 ± 10 DEG C
Furnace cooling is then air-cooled to arrive room temperature to 300 ± 10 DEG C afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611071358.9A CN106367567B (en) | 2016-11-29 | 2016-11-29 | A kind of method that CrNiMo quenched and tempered steel uses coal gas annealing furnace soft annealing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611071358.9A CN106367567B (en) | 2016-11-29 | 2016-11-29 | A kind of method that CrNiMo quenched and tempered steel uses coal gas annealing furnace soft annealing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106367567A CN106367567A (en) | 2017-02-01 |
| CN106367567B true CN106367567B (en) | 2018-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611071358.9A Active CN106367567B (en) | 2016-11-29 | 2016-11-29 | A kind of method that CrNiMo quenched and tempered steel uses coal gas annealing furnace soft annealing |
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| CN (1) | CN106367567B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100672A (en) * | 1985-04-01 | 1986-09-24 | 冶金工业部钢铁研究总院 | Steel for thick walled hyperpressure containers and manufacturing process thereof |
| CN1928128A (en) * | 2005-09-08 | 2007-03-14 | 内蒙古北方重工业集团有限公司 | Ingot slow cool annealing process for low-carbon steel |
| CN103572013A (en) * | 2013-11-19 | 2014-02-12 | 东北大学 | Spheroidizing annealing method of 40Cr steel |
| CN105755223A (en) * | 2014-12-13 | 2016-07-13 | 重庆霸腾机械有限公司 | 5CrNiMo spheroidizing annealing process |
-
2016
- 2016-11-29 CN CN201611071358.9A patent/CN106367567B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100672A (en) * | 1985-04-01 | 1986-09-24 | 冶金工业部钢铁研究总院 | Steel for thick walled hyperpressure containers and manufacturing process thereof |
| CN1928128A (en) * | 2005-09-08 | 2007-03-14 | 内蒙古北方重工业集团有限公司 | Ingot slow cool annealing process for low-carbon steel |
| CN103572013A (en) * | 2013-11-19 | 2014-02-12 | 东北大学 | Spheroidizing annealing method of 40Cr steel |
| CN105755223A (en) * | 2014-12-13 | 2016-07-13 | 重庆霸腾机械有限公司 | 5CrNiMo spheroidizing annealing process |
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|---|---|
| CN106367567A (en) | 2017-02-01 |
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