CN1847412A - Annealing process of 20CrMnTi steel for cold extrusion - Google Patents
Annealing process of 20CrMnTi steel for cold extrusion Download PDFInfo
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- CN1847412A CN1847412A CN 200510050229 CN200510050229A CN1847412A CN 1847412 A CN1847412 A CN 1847412A CN 200510050229 CN200510050229 CN 200510050229 CN 200510050229 A CN200510050229 A CN 200510050229A CN 1847412 A CN1847412 A CN 1847412A
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Abstract
The annealing process of 20CrMnTi steel for cold extrusion includes the following steps: 1. heating the steel in furnace at 860-930 deg.c for 6-11 hr; 2. lowering the temperature to 770-850 deg.c in 3-6 hr before maintaining for 9-15 hr; 3. lowering the temperature to 650-750 deg.c in 4-7 hr before maintaining for 11-16 hr; and 4. piling outside the furnace and covering with asbestos. The present invention has simple technological process and low cost, and once annealing of 20CrMnTi steel can reach hardness below 75HRB.
Description
Technical field
The present invention relates to a kind of thermal treatment of steel, particularly relate to the annealing heat treatment process of a kind of cold-extruded with the 20CrMnTi steel.
Background technology
Steel hardness height (greater than 75HRB) generally can produce adverse influence to cold-extruded, makes the steel can not cold extrusion forming, may crack in addition in addition etc.All think at present: cold-extruded adopts two to three annealing with the 20CrMnTi steel, and its hardness just can be less than 75HRB.
Summary of the invention
The object of the invention is to provide a kind of technology comparatively simple, cost is lower, cold-extruded just can be less than the annealing process of 75HRB with the 20CrMnTi steel back hardness of once annealing, solved two to three annealing processs of existing in prior technology exist technology comparatively complexity and cost than problems such as height.
Above-mentioned technical purpose of the present invention solves by the following technical programs: processing step is:
(1), steel are put into furnace temperature is insulation 6-11 hour behind 860 ℃-930 ℃ the stove internal heating to 860 ℃-930 ℃,
(2), be cooled to 770 ℃-850 ℃ by 3-6 hour temperature fall time after insulation 9-15 hour,
(3), be cooled to 650 ℃-750 ℃ by 4-7 hour temperature fall time after insulation 11-16 hour,
(4) come out of the stove whole basket stacks and builds with asbestos.
Wherein, advance furnace temperature and refer to that workpiece puts into the stove temperature before the body of heater; Holding temperature refers to that workpiece is heated or cools off the holding temperature that is reached; Temperature fall time refers to drop to the required time of lower temperature from higher temperature.The method for annealing that provides with the technical solution of the present invention back 20CrMnTi steel hardness of once annealing just can be less than 75HRB, and technology is comparatively simple, has reduced tooling cost.
As preferably, described furnace temperature is 860 ℃-910 ℃; The holding temperature of described (1) is 860 ℃-900 ℃; The soaking time of described (1) is 6-9 hour.
As preferably, the temperature fall time of described (2) is 3-5 hour, and the holding temperature of described (2) is 770 ℃-820 ℃, and the soaking time of described (2) is 9-13 hour.
As preferably, the temperature fall time of described (3) is 4-6 hour, and the holding temperature of described (3) is 650 ℃-720 ℃, and the soaking time of described (3) is 11-14 hour.
Characteristics such as therefore, it is comparatively simple that the present invention has technology, and tooling cost is lower.
Description of drawings
Accompanying drawing 1 is starting material metallograph (1000 *);
Accompanying drawing 2 is metallographs (1000 *) after the present invention anneals.
Embodiment
Below by specific embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1: it is 860 ℃ pit furnace that 20CrMnTi steel finish mix base is put into the stove temperature, material base is heated to 860 ℃, insulation is after 11 hours in stove, be cooled to 780 ℃ (temperature fall time is 3 hours), insulation is after 15 hours in stove, be cooled to 700 ℃ (temperature fall time is 7 hours), insulation is after 15 hours in stove, the whole basket of coming out of the stove stacks and builds with asbestos, can obtain hardness less than 75HRB (adopting the metal Rockwell determination of test method of GB GB/T230-91 regulation), metallographic structure (as Fig. 2) adds the cold-extruded of granular pearlite and expects with annealing for ferrite.
Embodiment 2: it is 870 ℃ pit furnace that 20CrMnTi steel finish mix base is put into the stove temperature, material base is heated to 870 ℃, insulation is after 8 hours in stove, be cooled to 820 ℃ (temperature fall time is 6 hours), insulation is after 13 hours in stove, be cooled to 650 ℃ (temperature fall time is 5 hours), insulation is after 13 hours in stove, the whole basket of coming out of the stove stacks and builds with asbestos, can obtain hardness less than 75HRB (adopting the metal Rockwell determination of test method of GB GB/T230-91 regulation), metallographic structure (as Fig. 2) adds the cold-extruded of granular pearlite and expects with annealing for ferrite.
Embodiment 3: it is 900 ℃ pit furnace that 20CrMnTi steel finish mix base is put into the stove temperature, material base is heated to 900 ℃, insulation is after 9 hours in stove, be cooled to 790 ℃ (temperature fall time is 4 hours), insulation is after 10 hours in stove, be cooled to 720 ℃ (temperature fall time is 6 hours), insulation is after 16 hours in stove, the whole basket of coming out of the stove stacks and builds with asbestos, can obtain hardness less than 75HRB (adopting the metal Rockwell determination of test method of GB GB/T230-91 regulation), metallographic structure (as Fig. 2) adds the cold-extruded of granular pearlite and expects with annealing for ferrite.
Embodiment 4: it is 910 ℃ pit furnace that 20CrMnTi steel finish mix base is put into the stove temperature, material base is heated to 910 ℃, insulation is after 8 hours in stove, be cooled to 850 ℃ (temperature fall time is 5 hours), insulation is after 11 hours in stove, be cooled to 750 ℃ (temperature fall time is 4 hours), insulation is after 11 hours in stove, the whole basket of coming out of the stove stacks and builds with asbestos, can obtain hardness less than 75HRB (adopting the metal Rockwell determination of test method of GB GB/T230-91 regulation), metallographic structure (as Fig. 2) adds the cold-extruded of granular pearlite and expects with annealing for ferrite.
Embodiment 5: it is 930 ℃ pit furnace that 20CrMnTi steel finish mix base is put into the stove temperature, material base is heated to 930 ℃, insulation is after 6 hours in stove, be cooled to 800 ℃ (temperature fall time is 5 hours), insulation is after 9 hours in stove, be cooled to 690 ℃ (temperature fall time is 6 hours), insulation is after 14 hours in stove, the whole basket of coming out of the stove stacks and builds with asbestos, can obtain hardness less than 75HRB (adopting the metal Rockwell determination of test method of GB GB/T230-91 regulation), metallographic structure (as Fig. 2) adds the cold-extruded of granular pearlite and expects with annealing for ferrite.
Claims (10)
1. a cold-extruded is characterized in that processing step is with the annealing process of 20CrMnTi steel:
(1), steel are put into furnace temperature is insulation 6-11 hour behind 860 ℃-930 ℃ the stove internal heating to 860 ℃-930 ℃,
(2), be cooled to 770 ℃-850 ℃ by 3-6 hour temperature fall time after insulation 9-15 hour,
(3), be cooled to 650 ℃-750 ℃ by 4-7 hour temperature fall time after insulation 11-16 hour,
(4) come out of the stove whole basket stacks and builds with asbestos.
2. cold-extruded according to claim 1 is characterized in that with the annealing process of 20CrMnTi steel described furnace temperature is 860 ℃-910 ℃.
3. the cold-extruded according to claim 1 and 2 annealing process of 20CrMnTi steel, the holding temperature that it is characterized in that described (1) is 860 ℃-900 ℃.
4. the cold-extruded according to claim 1 and 2 annealing process of 20CrMnTi steel, the soaking time that it is characterized in that described (1) is 6-9 hour.
5. the cold-extruded according to claim 1 and 2 annealing process of 20CrMnTi steel, the temperature fall time that it is characterized in that described (2) is 3-5 hour.
6. the cold-extruded according to claim 1 and 2 annealing process of 20CrMnTi steel, the holding temperature that it is characterized in that described (2) is 770 ℃-820 ℃.
7. the cold-extruded according to claim 1 and 2 annealing process of 20CrMnTi steel, the soaking time that it is characterized in that described (2) is 9-13 hour.
8. the cold-extruded according to claim 1 and 2 annealing process of 20CrMnTi steel, the temperature fall time that it is characterized in that described (3) is 4-6 hour.
9. the cold-extruded according to claim 1 and 2 annealing process of 20CrMnTi steel, the holding temperature that it is characterized in that described (3) is 650 ℃-720 ℃.
10. the cold-extruded according to claim 1 and 2 annealing process of 20CrMnTi steel, the soaking time that it is characterized in that described (3) is 11-14 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100502297A CN100434541C (en) | 2005-04-12 | 2005-04-12 | Annealing process of 20CrMnTi steel for cold extrusion |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100502297A CN100434541C (en) | 2005-04-12 | 2005-04-12 | Annealing process of 20CrMnTi steel for cold extrusion |
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| CN1847412A true CN1847412A (en) | 2006-10-18 |
| CN100434541C CN100434541C (en) | 2008-11-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417968A (en) * | 2011-10-24 | 2012-04-18 | 无锡翱天钢丝制品有限公司 | Technology for heat treatment on alloy cold headed steel |
| CN114622137A (en) * | 2022-03-03 | 2022-06-14 | 万向钱潮股份有限公司 | Advanced high-strength steel with better fatigue performance and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046353A (en) * | 1989-04-11 | 1990-10-24 | 东南大学 | Process of heat treatment technology for gear steel |
| JPH09256037A (en) * | 1996-03-22 | 1997-09-30 | Nippon Steel Corp | Production of thick high tensile strength steel plate for stress relieving annealing treatment |
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2005
- 2005-04-12 CN CNB2005100502297A patent/CN100434541C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417968A (en) * | 2011-10-24 | 2012-04-18 | 无锡翱天钢丝制品有限公司 | Technology for heat treatment on alloy cold headed steel |
| CN102417968B (en) * | 2011-10-24 | 2013-09-04 | 无锡翱天钢丝制品有限公司 | Technology for heat treatment on alloy cold headed steel |
| CN114622137A (en) * | 2022-03-03 | 2022-06-14 | 万向钱潮股份有限公司 | Advanced high-strength steel with better fatigue performance and preparation method thereof |
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| CN100434541C (en) | 2008-11-19 |
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