CN102676766A - Thermal treatment method for improving low-temperature impact toughness of austenite-ferrite stainless steel - Google Patents
Thermal treatment method for improving low-temperature impact toughness of austenite-ferrite stainless steel Download PDFInfo
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- CN102676766A CN102676766A CN2012101822894A CN201210182289A CN102676766A CN 102676766 A CN102676766 A CN 102676766A CN 2012101822894 A CN2012101822894 A CN 2012101822894A CN 201210182289 A CN201210182289 A CN 201210182289A CN 102676766 A CN102676766 A CN 102676766A
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- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 25
- 239000010935 stainless steel Substances 0.000 title claims abstract description 25
- 238000007669 thermal treatment Methods 0.000 title abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000006104 solid solution Substances 0.000 claims abstract description 10
- 239000000243 solution Substances 0.000 claims abstract description 10
- 238000009413 insulation Methods 0.000 claims description 16
- 238000005242 forging Methods 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 229910001039 duplex stainless steel Inorganic materials 0.000 abstract description 3
- 230000008646 thermal stress Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Abstract
The invention belongs to the technical field of production of duplex stainless steel products used at low temperature and particularly relates to a thermal treatment method for improving low-temperature impact toughness of austenite-ferrite stainless steel with high requirements for performance indexes. The thermal treatment method comprises the steps: feeding forged austenite-ferrite stainless steel into a furnace at the feeding temperature of not greater than 350 DEG C and performing twice preheating; performing solution treatment; performing cooling, feeding the austenite-ferrite stainless steel into clear water with the initial temperature smaller than 10 DEG C, and retaining the austenite-ferrite stainless steel for 20 minutes at the cooling speed of 4-6 seconds/mm. An austenite-ferrite stainless steel solution treatment process comprises the steps of (1) heating, namely controlling heating speed, preheating temperature, solid solution temperature and retaining time at a low-temperature section, reducing thermal stress and simultaneously obtaining good duplex structural proportion and (2) cooling, namely adopting a quick low-temperature long-time water-cooling mode to prevent precipitation due to fragility phase and remarkably reducing the plasticity and the toughness of the steel.
Description
Technical field
The invention belongs under the low temperature duplex stainless steel products production technical field of using, relate in particular to a kind of heat treating method of austenite-ferrite type stainless steel low-temperature impact toughness of having relatively high expectations for each item performance index.
Background technology
For the steel forgings product that uses at low temperatures; Because of operating ambient temperature lower; The fragility of product material can increase in the life-time service process, if the intensity of steel forgings material is just higher originally, low-temperature impact toughness is poor; Failure modes such as fracture then can take place because of fragility is excessive in a short period of time, reduce work-ing life.For making this series products can works better, unlikely early failure under user mode, except that need have preferably intensity, also need guarantee good low-temperature impact toughness.After austenite-ferrite type stainless steel product pressed common process thermal treatment, intensity can guarantee, but low-temperature impact toughness is relatively poor, can't satisfy request for utilization.
Summary of the invention
The objective of the invention is to overcome deficiency in the prior art and a kind of heat treatment technics is provided, utilize this technology when guaranteeing the strength of materials, effectively to improve low-temperature impact toughness, thereby to increase the service life.
The objective of the invention is to realize like this:
Improve the heat treating method of austenite-ferrite type stainless steel low-temperature impact toughness, method is following:
1) with being not more than shove charge under 350 ℃ of conditions at charging temperature after the stainless forging of austenite-ferrite type, carries out twice preheating;
2) temperature of preheating for the first time is 600～660 ℃, and the speed of heating is 0＜50 ℃/h, insulation 1～3h; The temperature of preheating for the second time is 830～900 ℃, and insulation 1～3h carries out solution treatment then;
3) temperature of solid solution is 1040～1080 ℃, and soaking time adopts 0.8～1.3 hour/100mm, cools off then;
4) put into initial temperature less than 10 ℃ clear water, the speed of cooling with 4-6 second/millimeter kept 20 minutes.
The weight percent of the composition that the austenite-ferrite type stainless steel in the described step 1) is contained is following: the weight percent of C is 0-0.030%, and the weight percent of Si is 0-1.00%, and the weight percent of Mn is 0-2.00%; The weight percent of P is 0-0.030%; The weight percent of S is 0-0.020%, and the weight percent of Ni is 4.50-6.50%, and the weight percent of Cr is 21.00-23.00%; The weight percent of Mo is 2.50-3.50%, and the weight percent of N is 0.08-0.20%.
In order to control the temperature of clear water, be 38-40 ton/hour continual injection clear water in the described step 4) with speed.
The present invention has following advantage:
Austenite-ferrite type stainless steel solid solution treatment process comprises following operation: 1. heating, and rate of heating, preheating temperature, solid solubility temperature and the hold-time of control low-temperature zone, reduce thermal stresses, obtain two-phase structure's ratio preferably simultaneously; 2. cooling, the Cooling Mode of water-cooled when adopting low temperature long is to prevent significantly to reduce the plasticity and the toughness of steel because of the separating out of fragility phase.
Description of drawings
Fig. 1 is treatment process figure of the present invention.
Embodiment
Embodiment below in conjunction with concrete is further described the present invention.
Embodiment 1:
Improve the heat treating method of austenite-ferrite type stainless steel low-temperature impact toughness, method is following:
1) with being not more than shove charge under 350 ℃ of conditions at charging temperature after the stainless forging of austenite-ferrite type, carries out twice preheating;
2) temperature of preheating for the first time is 600 ℃, and the speed of heating is 0＜50 ℃/h, insulation 1h; The temperature of preheating for the second time is 830 ℃, and insulation 1h carries out solution treatment then;
3) temperature of solid solution is 1040 ℃, and soaking time adopts 0.8 hour/100mm, cools off then;
4) put into initial temperature less than 10 ℃ clear water,, kept 20 minutes with 4 seconds/millimeter speed of cooling.
In order to control the temperature of clear water, be 38 tons of/hour continual injection clear water in the described step 4) with speed.
Embodiment 2:
Improve the heat treating method of austenite-ferrite type stainless steel low-temperature impact toughness, method is following:
1) with being not more than shove charge under 350 ℃ of conditions at charging temperature after the stainless forging of austenite-ferrite type, carries out twice preheating;
2) temperature of preheating for the first time is 660 ℃, and the speed of heating is 0＜50 ℃/h, insulation 3h; The temperature of preheating for the second time is 900 ℃, and insulation 3h carries out solution treatment then;
3) temperature of solid solution is 1080 ℃, and soaking time adopts 1.3 hours/100mm, cools off then;
4) put into initial temperature less than 10 ℃ clear water,, kept 20 minutes with 6 seconds/millimeter speed of cooling.
In order to control the temperature of clear water, be 40 tons of/hour continual injection clear water in the described step 4) with speed.
Embodiment 3:
Improve the heat treating method of austenite-ferrite type stainless steel low-temperature impact toughness, method is following:
1) with being not more than shove charge under 350 ℃ of conditions at charging temperature after the stainless forging of austenite-ferrite type, carries out twice preheating;
2) temperature of preheating for the first time is 630 ℃, and the speed of heating is 0＜50 ℃/h, insulation 2h; The temperature of preheating for the second time is 870 ℃, and insulation 1h carries out solution treatment then;
3) temperature of solid solution is 1060 ℃, and soaking time adopts 1 hour/100mm, cools off then;
4) put into initial temperature less than 10 ℃ clear water,, kept 20 minutes with the speed of cooling of 5s/ millimeter.
In order to control the temperature of clear water, be 39 tons of/hour continual injection clear water in the described step 4) with speed.
Embodiment 4:
Improve the heat treating method of austenite-ferrite type stainless steel low-temperature impact toughness, method is following:
1) with being not more than shove charge under 350 ℃ of conditions at charging temperature after the stainless forging of austenite-ferrite type, carries out twice preheating;
2) temperature of preheating for the first time is 620 ℃, and the speed of heating is 0＜50 ℃/h, insulation 3h; The temperature of preheating for the second time is 840 ℃, and insulation 1h carries out solution treatment then;
3) temperature of solid solution is 1050 ℃, and soaking time adopts 0.9 hour/100mm, cools off then;
4) put into initial temperature less than 10 ℃ clear water,, kept 20 minutes with the speed of cooling of 4s/ millimeter.
In order to control the temperature of clear water, be 39 tons of/hour continual injection clear water in the described step 4) with speed.
Embodiment 5:
Improve the heat treating method of austenite-ferrite type stainless steel low-temperature impact toughness, method is following:
1) with being not more than shove charge under 350 ℃ of conditions at charging temperature after the stainless forging of austenite-ferrite type, carries out twice preheating;
2) temperature of preheating for the first time is 650 ℃, and the speed of heating is 0＜50 ℃/h, insulation 3h; The temperature of preheating for the second time is 880 ℃, and insulation 1h carries out solution treatment then;
3) temperature of solid solution is 1070 ℃, and soaking time adopts 1 hour/100mm, cools off then;
4) put into initial temperature less than 10 ℃ clear water,, kept 20 minutes with the speed of cooling of 1.2s/ millimeter.
In order to control the temperature of clear water, be 39 tons of/hour continual injection clear water in the described step 4) with speed.
Embodiment 6:
Improve the heat treating method of austenite-ferrite type stainless steel low-temperature impact toughness, method is following:
1) with being not more than shove charge under 350 ℃ of conditions at charging temperature after the stainless forging of austenite-ferrite type, carries out twice preheating;
2) temperature of preheating for the first time is 640 ℃, and the speed of heating is 0＜50 ℃/h, insulation 2h; The temperature of preheating for the second time is 890 ℃, and insulation 1h carries out solution treatment then;
3) temperature of solid solution is 1070 ℃, and soaking time adopts 1 hour/100mm, cools off then;
4) put into initial temperature less than 10 ℃ clear water,, kept 20 minutes with the speed of cooling of 6s/ millimeter.
In order to control the temperature of clear water, be 40 tons of/hour continual injection clear water in the described step 4) with speed.
Technology point is analyzed:
Heat-processed: because of duplex stainless steel interalloy component content is high, heat conduction is slow, simultaneously in the early stage hot procedure (as forging); There is fragility to separate out mutually inevitably, material is become fragile, so need the strict rate of heating of controlling low-temperature zone in 50 ℃/h; Reach charging temperature in 350 ℃, adopt twice preheating in the heat-processed, reduce workpiece and fully dissolve with the assurance alloying element because of the thermal stresses that internal-external temperature difference produces; The soaking time that the soaking time of the low thermophase of control is longer than hot stage; Improve the heat-up rate of hot stage, the hold-time that shortens hot stage is 1 hour, avoids grain coarsening; The designing optimal solid solubility temperature obtains two-phase structure's ratio preferably.
Process of cooling: through the conscientious cooling of crane, the speed that crane is put into water with workpiece adopts the speed of 4-6 second/millimeter, reduces journey time as far as possible; Reduce the workpiece thermosteresis; The temperature rise in water temp and the process of cooling is initially gone in strict control, in order to control the temperature of clear water, is 38-40 ton/hour continual injection clear water with speed; To prevent significantly to reduce the plasticity and the toughness of steel because of the separating out of fragility phase.
The austenite-ferrite type stainless steel product tensile strength of utilizing explained hereafter of the present invention is greater than 620Mpa, and low temperature (29 ℃) V-type ballistic work is on average greater than 80J, and two-phase structure respectively is 50%, and grain fineness number is greater than 5 grades.
In the technological process of the present invention, the weight percent of the composition that austenite-ferrite type stainless steel is contained is following: the weight percent of C is 0-0.030%, and the weight percent of Si is 0-1.00%; The weight percent of Mn is 0-2.00%; The weight percent of P is 0-0.030%, and the weight percent of S is 0-0.020%, and the weight percent of Ni is 4.50-6.50%; The weight percent of Cr is 21.00-23.00%; The weight percent of Mo is 2.50-3.50%, and the weight percent of N is 0.08-0.20%, and the austenite-ferrite type stainless steel of employing is that diameter is the forging of 200mm.
Claims (3)
1. heat treating method that improves austenite-ferrite type stainless steel low-temperature impact toughness, it is characterized in that: method is following:
1) with being not more than shove charge under 350 ℃ of conditions at charging temperature after the stainless forging of austenite-ferrite type, carries out twice preheating;
2) temperature of preheating for the first time is 600～660 ℃, and the speed of heating is 0＜50 ℃/h, insulation 1～3h; The temperature of preheating for the second time is 830～900 ℃, and insulation 1～3h carries out solution treatment then;
3) temperature of solid solution is 1040～1080 ℃, and soaking time adopts 0.8～1.3 hour/100mm, cools off then;
4) put into initial temperature less than 10 ℃ clear water, the speed of cooling with 4-6 second/millimeter kept 20 minutes.
2. a kind of heat treating method that improves austenite-ferrite type stainless steel low-temperature impact toughness according to claim 1; It is characterized in that: the weight percent of the composition that the austenite-ferrite type stainless steel in the described step 1) is contained is following: the weight percent of C is 0-0.030%, and the weight percent of Si is 0-1.00%, and the weight percent of Mn is 0-2.00%; The weight percent of P is 0-0.030%; The weight percent of S is 0-0.020%, and the weight percent of Ni is 4.50-6.50%, and the weight percent of Cr is 21.00-23.00%; The weight percent of Mo is 2.50-3.50%, and the weight percent of N is 0.08-0.20%.
3. a kind of heat treating method that improves austenite-ferrite type stainless steel low-temperature impact toughness according to claim 1 is characterized in that: in order to control the temperature of clear water, be 38-40 ton/hour continual injection clear water with speed in the described step 4).
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| CN103266219A (en) * | 2013-05-07 | 2013-08-28 | 舞阳钢铁有限责任公司 | Ni-Cr alloy-containing steel ingot heating control process |
| CN103526130A (en) * | 2013-10-23 | 2014-01-22 | 北京科技大学 | Processing method for direct cold rolling of two-phase stainless steel as-cast state billet steel after solid solution treatment |
| CN104531964A (en) * | 2014-11-28 | 2015-04-22 | 振石集团东方特钢股份有限公司 | Production method of high performance duplex stainless steel hot rolled coil |
| CN105018703A (en) * | 2015-07-28 | 2015-11-04 | 苏州市鑫渭阀门有限公司 | Solution treatment technology for high-pressure stainless steel pump |
| CN105256121A (en) * | 2015-10-21 | 2016-01-20 | 苏州雷格姆海洋石油设备科技有限公司 | Thermal treatment method for improving low-temperature toughness and corrosion resistance of 22Cr-type stainless steel forging |
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| CN103266219B (en) * | 2013-05-07 | 2015-04-15 | 舞阳钢铁有限责任公司 | Ni-Cr alloy-containing steel ingot heating control process |
| CN103266219A (en) * | 2013-05-07 | 2013-08-28 | 舞阳钢铁有限责任公司 | Ni-Cr alloy-containing steel ingot heating control process |
| CN103526130B (en) * | 2013-10-23 | 2017-01-11 | 北京科技大学 | Processing method for direct cold rolling of two-phase stainless steel as-cast state billet steel after solid solution treatment |
| CN103526130A (en) * | 2013-10-23 | 2014-01-22 | 北京科技大学 | Processing method for direct cold rolling of two-phase stainless steel as-cast state billet steel after solid solution treatment |
| CN104531964A (en) * | 2014-11-28 | 2015-04-22 | 振石集团东方特钢股份有限公司 | Production method of high performance duplex stainless steel hot rolled coil |
| CN105018703A (en) * | 2015-07-28 | 2015-11-04 | 苏州市鑫渭阀门有限公司 | Solution treatment technology for high-pressure stainless steel pump |
| CN105256121B (en) * | 2015-10-21 | 2017-07-28 | 苏州雷格姆海洋石油设备科技有限公司 | A kind of heat treatment method of raising 22Cr type stainless steel forgings low-temperature flexibilities and decay resistance |
| CN105256121A (en) * | 2015-10-21 | 2016-01-20 | 苏州雷格姆海洋石油设备科技有限公司 | Thermal treatment method for improving low-temperature toughness and corrosion resistance of 22Cr-type stainless steel forging |
| CN106119732A (en) * | 2016-06-24 | 2016-11-16 | 张家港海锅重型锻件有限公司 | A kind of deep-sea oil extracting ship F60 two phase stainless steel pipe joint forging feedstock production process |
| CN106119732B (en) * | 2016-06-24 | 2017-11-10 | 张家港海锅重型锻件有限公司 | A kind of deep-sea oil extracting ship F60 two phase stainless steels pipe joint forging feedstock production process |
| CN108356189A (en) * | 2018-01-29 | 2018-08-03 | 钢铁研究总院 | The cogging forging method of 2507 super-duplex stainless steel strands |
| CN108356189B (en) * | 2018-01-29 | 2020-03-20 | 钢铁研究总院 | Cogging forging method of 2507 super duplex stainless steel casting blank |
| CN108486338A (en) * | 2018-03-22 | 2018-09-04 | 钢铁研究总院 | A kind of two phase stainless steel and its hot-working method |
| CN109385507A (en) * | 2018-12-20 | 2019-02-26 | 四川民盛特钢锻造有限公司 | A kind of heat treatment method of ultra hypoeutectoid, diphasic stainless steel bowl |
| CN109702205A (en) * | 2019-03-08 | 2019-05-03 | 成都双创时代科技有限公司 | A kind of austenitic stainless steel metal powder injection molding components heat treatment process |
| CN113145777A (en) * | 2020-12-31 | 2021-07-23 | 无锡派克新材料科技股份有限公司 | Manufacturing method for improving strength and low-temperature impact property of austenite ferrite duplex stainless steel |
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Effective date of registration: 20130226 Address after: Zhi Town East Jiyuan of Henan province 454650 city stay Village Applicant after: HENAN ZHONGYUAN HEAVY FORGING Co.,Ltd. Address before: 2 Building 2, unit 454650, Huaxin East Road, Wenhua Road, Henan, Jiyuan, 301 Applicant before: Mi Yunxia |
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Denomination of invention: Thermal treatment method for improving low-temperature impact toughness of austenite-ferrite stainless steel Effective date of registration: 20200409 Granted publication date: 20140709 Pledgee: Bank of China Limited by Share Ltd. Jiyuan branch Pledgor: HENAN ZHONGYUAN HEAVY FORGING Co.,Ltd. Registration number: Y2020980001371 |
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Date of cancellation: 20210406 Granted publication date: 20140709 Pledgee: Bank of China Limited by Share Ltd. Jiyuan branch Pledgor: HENAN ZHONGYUAN HEAVY FORGING Co.,Ltd. Registration number: Y2020980001371 |
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Denomination of invention: Heat treatment method for improving low temperature impact toughness of austenitic ferritic stainless steel Effective date of registration: 20210409 Granted publication date: 20140709 Pledgee: Bank of China Limited by Share Ltd. Jiyuan branch Pledgor: HENAN ZHONGYUAN HEAVY FORGING Co.,Ltd. Registration number: Y2021980002512 |
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Date of cancellation: 20220325 Granted publication date: 20140709 Pledgee: Bank of China Limited by Share Ltd. Jiyuan branch Pledgor: HENAN ZHONGYUAN HEAVY FORGING Co.,Ltd. Registration number: Y2021980002512 |
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Denomination of invention: Heat treatment method for improving low temperature impact toughness of austenitic ferritic stainless steel Effective date of registration: 20220329 Granted publication date: 20140709 Pledgee: Bank of China Limited by Share Ltd. Jiyuan branch Pledgor: HENAN ZHONGYUAN HEAVY FORGING Co.,Ltd. Registration number: Y2022980003454 |
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Date of cancellation: 20231011 Granted publication date: 20140709 Pledgee: Bank of China Limited by Share Ltd. Jiyuan branch Pledgor: HENAN ZHONGYUAN HEAVY FORGING Co.,Ltd. Registration number: Y2022980003454 |