CN104099456A - Forging and heat treatment method of 9Cr18MoV steel forging - Google Patents
Forging and heat treatment method of 9Cr18MoV steel forging Download PDFInfo
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- CN104099456A CN104099456A CN201410304679.3A CN201410304679A CN104099456A CN 104099456 A CN104099456 A CN 104099456A CN 201410304679 A CN201410304679 A CN 201410304679A CN 104099456 A CN104099456 A CN 104099456A
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Abstract
The invention discloses a forging and heat treatment method of a 9Cr18MoV steel forging. The forging and heat treatment method comprises the following steps: a 9Cr18MoV steel ingot is put in a heat treatment furnace for performing the heat treatment before the forging, and is forged to produce a blank within a certain temperature range after the heat treatment; the 9Cr18MoV steel blank is finally forged within the certain temperature range to obtain the 9Cr18MoV steel forging; the normalization heat treatment is performed for the 9Cr18MoV steel forging; and the tempering heat treatment is performed for the 9Cr18MoV steel forging. The 9Cr18MoV steel forging has excellent corrosion resistance through reasonably controlling various process parameters, so that the 9Cr18MoV steel forging can be successfully applied to the production of such parts as gas turbines.
Description
Technical field
The present invention relates to forging and the heat treating method method of stainless steel forgings, particularly related to a kind of forging and heat treating method of 9Cr18MoV steel forgings.
Background technology
9Cr18MoV steel is a kind of martensite type stainless steel, has good erosion resistance.The Mo element and the V element that in steel, add, can improve the pitting corrosion resistant performance of steel, meanwhile, improved the heat resistance of steel and can at higher temperature, use.What many component of internal combustion turbine adopted is this material forging.
While adopting conventional forging method to forge 9Cr18MoV steel, often there will be carbide to separate out at intergranular, in follow-up heat treatment process, occur carburizing, nitriding and ooze the phenomenons such as hydrogen, had a strong impact on the corrosion resistance of 9Cr18MoV steel.
Summary of the invention
The technical problem to be solved in the present invention is to provide after a kind of employing is heat-treated 9Cr18MoV steel and forges, realizes forging and the heat treating method of this steel forgings, can make 9Cr18MoV steel forgings obtain good corrosion resistance.
For solving the problems of the technologies described above, the forging of 9Cr18MoV steel forgings of the present invention and heat treating method, its technical scheme comprises the following steps:
(1) 9Cr18MoV steel ingot is packed into and in heat treatment furnace, forge front thermal treatment;
(2) in certain temperature range, the 9Cr18MoV steel ingot after above-mentioned thermal treatment is being forged to base;
(3) in certain temperature range, above-mentioned 9Cr18MoV steel billet material is carried out to finish-forging shaping, obtain 9Cr18MoV steel forgings;
(4) above-mentioned 9Cr18MoV steel forgings is carried out to normalizing thermal treatment;
(5) above-mentioned 9Cr18MoV steel forgings is carried out to tempering heat treatment.
Before the described forging of step (1), thermal treatment is by described 9Cr18MoV Heating Steel Ingots to 1150 ± 10 ℃ insulation 20～100min, cools to 980 ± 10 ℃ of insulation 20～100min with the furnace, and air cooling is to room temperature.
The described base temperature range of step (2) is 1000 ℃～1150 ℃.
The described finish-forging forming temperature interval of step (3) is 780 ℃～900 ℃.
The described normalizing thermal treatment of step (4) comprises double normalizing thermal treatment, normalizing is for the first time first 9Cr18MoV steel forgings to be heated to 800 ± 10 ℃ of ℃ of insulation 30～120min, be warming up to again 920 ℃ of insulation 30～120min, behind air cooling to 200～300 ℃, carry out normalizing for the second time; Normalizing is for the second time first 9Cr18MoV steel forgings to be heated to 650 ± 10 ℃ of insulation 30～120min, then is warming up to 750 ± 10 ℃ of insulation 30～120min, and air cooling is to room temperature.
The described tempering heat treatment of step (5) is that 9Cr18MoV steel forgings is heated to 220～240 ℃ of insulation 30～100min, and air cooling is to room temperature.
Compared with prior art, beneficial effect of the present invention is as follows:
The forging of 9Cr18MoV steel forgings of the present invention and heat treating method, 9Cr18MoV steel ingot is heat-treated before forging, carbide is dissolved in crystal grain completely, avoided carbide in forging process, to separate out because of enrichment on crystal boundary, thereby guaranteed the corrosion resistance of 9Cr18MoV steel.Before forging, thermal treatment is first heated to 1150 ℃ ± 10 ℃ insulations and drops to 980 ± 10 ℃ of insulations again, makes 9Cr18MoV steel matrix tissue have good stressed condition, has guaranteed that subsequent thermal processing completes smoothly.
1000 ℃～1150 ℃ temperature ranges, carry out base, at 780 ℃～900 ℃, carry out finish-forging shaping, forging is organized more uniform and stable, and more refinement of crystal grain, intensity, toughness and the low temperature impact properties of forging are greatly improved.
Adopt double normalizing, obviously alleviated the defects such as banded structure of forging, make structure refinement even.Adopt the low-temperaturetempering of 220～240 ℃, prevented carburizing, the nitriding of 9Cr18MoV steel and oozed the phenomenons such as hydrogen, further guaranteed the corrosion resistance of 9Cr18MoV steel, meanwhile, eliminated the negative effect of unrelieved stress after forging; Effectively controlled hydrogen richness, made organizing of 9Cr18MoV steel forgings more tiny evenly.
Its tensile strength of room temperature tensile performance of this 9Cr18MoV steel forgings is 1140～1250MPa (being greater than the 1020MPa of service requirements) after testing, elongation after fracture is 15%～18% (be greater than service requirements 12%), relative reduction in area is 38%～42% (be greater than service requirements 25%), and hardness HRC is 56～59 (meeting the > 55 of service requirements).
At room temperature, the corrosion speed in the salpeter solution that massfraction is 5%～20% is 0.03～0.05mm/a (meeting the < 0.1mm/a of service requirements) to the corrosion resistance nature of this 9Cr18MoV steel forgings after testing.
Embodiment
Forging and the heat treating method of implementing 9Cr18MoV steel forgings of the present invention, need to provide high-temperature heater, pressing machine, mechanical manipulator, the equipment such as looping mill.Embodiment is as follows:
9Cr18MoV steel main chemical elements content (weight percent) is: C content 0.85%～0.95%, containing Mn amount≤0.80%, si content≤0.80%, containing Cr amount 17.0%～19.0%, containing Mo amount≤1.0%～1.3%, V content≤0.07%～0.12%, containing S amount≤0.030%, P content≤0.035%, surplus, be Fe.
The forging of 9Cr18MoV steel forgings and thermal treatment process step are as follows:
By 9Cr18MoV Heating Steel Ingots to 1150 ± 10 ℃ insulation 20～100min, cool to 980 ± 10 ℃ of insulation 20～100min with the furnace, air cooling is to room temperature.
In the temperature range of 1000 ℃～1150 ℃, 9Cr18MoV steel ingot is carried out to base.In the temperature range of 780 ℃～900 ℃, 9Cr18MoV steel billet material is carried out to finish-forging shaping and obtain 9Cr18MoV steel forgings.
9Cr18MoV steel forgings is carried out to double normalizing thermal treatment, and normalizing is for the first time first 9Cr18MoV steel forgings to be heated to 800 ± 10 ℃ of ℃ of insulation 30～120min, then is warming up to 920 ℃ of insulation 30～120min, behind air cooling to 200～300 ℃, carries out normalizing for the second time; Normalizing is for the second time first 9Cr18MoV steel forgings to be heated to 650 ± 10 ℃ of insulation 30～120min, then is warming up to 750 ± 10 ℃ of insulation 30～120min, and air cooling is to room temperature.
9Cr18MoV steel forgings is carried out to tempering heat treatment 9Cr18MoV steel forgings is heated to 220～240 ℃ of insulation 30～100min, air cooling is to room temperature.
Claims (6)
1. the forging of 9Cr18MoV steel forgings and a heat treating method, is characterized in that, comprises the following steps:
(1) 9Cr18MoV steel ingot is packed into and in heat treatment furnace, forge front thermal treatment;
(2) in certain temperature range, the 9Cr18MoV steel ingot after above-mentioned thermal treatment is being forged to base;
(3) in certain temperature range, above-mentioned 9Cr18MoV steel billet material is carried out to finish-forging shaping, obtain 9Cr18MoV steel forgings;
(4) above-mentioned 9Cr18MoV steel forgings is carried out to normalizing thermal treatment;
(5) above-mentioned 9Cr18MoV steel forgings is carried out to tempering heat treatment.
2. the forging of 9Cr18MoV steel forgings according to claim 1 and heat treating method, it is characterized in that, before the forging of described step (1), heat treatment process is by described 9Cr18MoV Heating Steel Ingots to 1150 ± 10 ℃ insulation 20～100min, cool to 980 ± 10 ℃ of insulation 20～100min with the furnace, air cooling is to room temperature.
3. the forging of 9Cr18MoV steel forgings according to claim 1 and heat treating method, is characterized in that, the base temperature range of described step (2) is 1000 ℃～1150 ℃.
4. the forging of 9Cr18MoV steel forgings according to claim 1 and heat treating method, is characterized in that, the finish-forging forming temperature interval of described step (3) is 780 ℃～900 ℃.
5. the forging of 9Cr18MoV steel forgings according to claim 1 and heat treating method, it is characterized in that, the normalizing thermal treatment of described step (4) comprises double normalizing thermal treatment, normalizing is for the first time first 9Cr18MoV steel forgings to be heated to 800 ± 10 ℃ of ℃ of insulation 30～120min, be warming up to again 920 ℃ of insulation 30～120min, behind air cooling to 200～300 ℃, carry out normalizing for the second time; Normalizing is for the second time first 9Cr18MoV steel forgings to be heated to 650 ± 10 ℃ of insulation 30～120min, then is warming up to 750 ± 10 ℃ of insulation 30～120min, and air cooling is to room temperature.
6. the forging of 9Cr18MoV steel forgings according to claim 1 and heat treating method, is characterized in that, the tempering heat treatment of described step (5) is that 9Cr18MoV steel forgings is heated to 220～240 ℃ of insulation 30～100min, and air cooling is to room temperature.
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Cited By (4)
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| CN106854691A (en) * | 2016-10-31 | 2017-06-16 | 广东长盈精密技术有限公司 | Steel part Technology for Heating Processing, steel part forging method and annealing device using the Technology for Heating Processing |
| CN107190130A (en) * | 2017-06-14 | 2017-09-22 | 合肥博创机械制造有限公司 | A kind of engine shroud Technology for Heating Processing |
| CN107267723A (en) * | 2017-07-11 | 2017-10-20 | 合肥康之恒机械科技有限公司 | A kind of Technology for Heating Processing of low alloy steel castings |
| CN108998643A (en) * | 2018-09-27 | 2018-12-14 | 东莞市国森科精密工业有限公司 | A method of improving flexbile gear raw material banded structure |
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| CN107267723A (en) * | 2017-07-11 | 2017-10-20 | 合肥康之恒机械科技有限公司 | A kind of Technology for Heating Processing of low alloy steel castings |
| CN108998643A (en) * | 2018-09-27 | 2018-12-14 | 东莞市国森科精密工业有限公司 | A method of improving flexbile gear raw material banded structure |
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Application publication date: 20141015 |