CN103820630B - The nuclear in-pile component heat treating method of austenitic stainless steel cheese forging - Google Patents
The nuclear in-pile component heat treating method of austenitic stainless steel cheese forging Download PDFInfo
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- CN103820630B CN103820630B CN201210470101.6A CN201210470101A CN103820630B CN 103820630 B CN103820630 B CN 103820630B CN 201210470101 A CN201210470101 A CN 201210470101A CN 103820630 B CN103820630 B CN 103820630B
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Abstract
The invention discloses a kind of heat treating method of nuclear in-pile component austenitic stainless steel cheese forging, for being 0Cr19Ni10 to material, diameter is not less than 4000mm, the solid forging that thickness is not less than 400mm is heat-treated, comprise the following steps: the first step, forging is heated to 400 ~ 450 DEG C of scope inside holding with the peak power of heat treatment furnace, and soaking time is every 1 millimeter of forging thickness insulation 0.5 ~ 1 minute; Second step, is heated to 670 ~ 700 DEG C of scope inside holding with the heat-up rate being not more than 50 DEG C/h by forging, and soaking time is every 1 millimeter of forging thickness insulation 0.5 ~ 1 minute; 3rd step, is heated to 1040 ~ 1080 DEG C of scope inside holding with the heat-up rate being not more than 150 DEG C/h by forging, and soaking time is every 1 millimeter of forging thickness insulation 3 ~ 5 minutes; 4th step, forging is come out of the stove and water-cooled.0Cr19Ni10 steel forgings after thermal treatment of the present invention, its crystal grain does not have grow up phenomenon and homogeneous microstructure, and room temperature and 350 DEG C of hot strengths meet nuclear in-pile component design requirements.
Description
Technical field
The present invention relates to a kind of heat treating method, be specifically related to a kind of heat treating method of nuclear in-pile component austenitic stainless steel cheese forging.
Background technology
Along with rapid development of economy, various countries are to the demand sharp increase of the energy.Because nuclear fuel can discharge efficient and clean energy, impel the development and utilization of nuclear energy.AP1000 nuclear power heap-type has the advantages that to maximize with integration compared with other comparatively early heap-type, and size, the weight of its nuclear power primary device in-pile component are also correspondingly larger.
In-pile component is positioned at the center of reactor, provides support and compress for nuclear fuel assembly, simultaneously also for pressurized vessel provides shielding, makes the impact of its few raying.In-pile component austenitic stainless steel cheese forging in AP1000 pressurized-water reactor mainly contains lower core plate and upper support board, its diameter is about 4 meters, thickness is then more than 400mm, not only provide shield effectiveness, but also play the effect of balancing machine load and hydraulic load, they both directly contacted with refrigerant, nuclear fuel, directly accept corrosion and radiation, carry again the huge and pressure of complexity, service condition is very harsh, therefore high especially to the requirement of its security.
The material selected by heavy wall cheese forging manufacturing in-pile component is austenitic stainless steel, and material mark is SA-336F304H, and in corresponding country, the trade mark is 0Cr19Ni10.ASME standard only has holding temperature to be not less than 1040 DEG C to the solution heat treatment parameter that this material provides, and correspondingly obtains that room-temperature yield strength is not less than 205MPa, tensile strength is not less than 485MPa.But, in order to tackle mechanical load and hydraulic load, requirements at the higher level are proposed to the mechanical property of material: Rockwell hardness HRB is not higher than 92, and 350 DEG C of lower yield strengths are not less than 125MPa.If the thermal treatment process described in use standard, the test-results of gained be Rockwell hardness more than 100HRB, the yield strength at 350 DEG C only has 100MPa, cannot ensure the operation and maintenance of AP1000 nuclear power heap-type.
Cheese forging is the forging that in nuclear in-pile component, thermal treatment difficulty is maximum, and major cause is relevant with its geometrical shape.Owing to being solid forging, in solid solution process of cooling, easily assemble steam film bottom forging and worsen cooling conditions.Practice shows, if do not adopted an effective measure, can reach hundreds of DEG C, thus cause poor-performing bottom forging bottom forging with the temperature difference in side at the same time process of cooling, worsens the homogeneity of forging performance.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of heat treating method of nuclear in-pile component austenitic stainless steel cheese forging, and it can meet the operation and maintenance requirement of AP1000 nuclear power heap-type.
For solving the problems of the technologies described above, the technical solution of the heat treating method of nuclear in-pile component austenitic stainless steel cheese forging of the present invention is:
For being 0Cr19Ni10 to material, diameter is not less than 4000mm, and the solid forging that thickness is not less than 400mm is heat-treated, and comprises the following steps:
The first step, is placed in heat treatment furnace by forging, is heated to 400 ~ 450 DEG C of scope inside holding with the peak power of heat treatment furnace, and soaking time is every 1 millimeter of forging thickness insulation 0.5 ~ 1 minute;
Second step, continues heated parts, with the heat-up rate being not more than 50 DEG C/h, forging is heated to 670 ~ 700 DEG C of scope inside holding, and soaking time is every 1 millimeter of forging thickness insulation 0.5 ~ 1 minute;
3rd step, continues heated parts, with the heat-up rate being not more than 150 DEG C/h, forging is heated to 1040 ~ 1080 DEG C of scope inside holding, and soaking time is every 1 millimeter of forging thickness insulation 3 ~ 5 minutes;
4th step, forging is come out of the stove and water-cooled.
The method of described 4th step water-cooled is: the initial temperature of water coolant is not higher than 30 DEG C; At bottom of gullet setting current drive unit vertically upward, the current of vertical direction are utilized to break the steam film be gathered in bottom forging.
After described 4th step water-cooled, the surface temperature of forging water outlet after 15 minutes be not higher than 80 DEG C.
The technique effect that the present invention can reach is:
0Cr19Ni10 steel forgings after thermal treatment of the present invention, its crystal grain does not have grow up phenomenon and homogeneous microstructure, room temperature and 350 DEG C of hot strengths meet nuclear in-pile component design requirements, and surplus capacity is comparatively large, the performance at two ends is even, and grain fineness number does not have obviously grows up, ultrasound examination does not find defect reflection signal, liquid penetration examination does not find defect vestige, all qualified, can ensure the total quality of forging.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is the schematic diagram of the heat treating method of nuclear in-pile component austenitic stainless steel cheese forging of the present invention.
Embodiment
As shown in Figure 1, the heat treating method of nuclear in-pile component austenitic stainless steel cheese forging of the present invention, for being 0Cr19Ni10 to material, diameter is not less than 4000mm, and the solid forging that thickness is not less than 400mm is heat-treated, and comprises the following steps:
The first step, is placed in heat treatment furnace by forging, is heated to 400 ~ 450 DEG C of scope inside holding with the peak power of heat treatment furnace, and soaking time is every 1 millimeter of forging thickness insulation 0.5 ~ 1 minute;
The object of this step controls the surface of forging and the temperature head in heart portion, avoids the forging cracking that blue shortness causes;
Second step, continues heated parts, with the heat-up rate being not more than 50 DEG C/h, forging is heated to 670 ~ 700 DEG C of scope inside holding, and soaking time is every 1 millimeter of forging thickness insulation 0.5 ~ 1 minute;
The object of this step reduces the temperature head in workpiece surface and heart portion, weakens the appearance that thermal stresses avoids tiny crack on the one hand, improve heating efficiency on the other hand;
3rd step, continues heated parts, with the heat-up rate being not more than 150 DEG C/h, forging is heated to 1040 ~ 1080 DEG C of scope inside holding, and soaking time is every 1 millimeter of forging thickness insulation 3 ~ 5 minutes;
The object of this step is that the Carbide Phases in steel is fully dissolved, and obtains the sosoloid of degree of supersaturation, reaches the object of strengthening; Fast forging is heated to austenitic temperature, object reduces actual Ovshinsky soaking time, prevents grain growth; To cause grain growth higher than the austenitizing holding temperature of 1080 DEG C, the heat-up rate being not more than 150 DEG C/h then effectively can prevent grain growth;
4th step, forging is come out of the stove and is cooled, and the type of cooling is water-cooled; Forging water outlet 15 minutes rear surface temperature are not higher than 80 DEG C;
For ensureing enough cooling rates, the method for water-cooled is as follows:
The initial temperature of water coolant is not higher than 30 DEG C; At bottom of gullet setting current drive unit vertically upward, utilize the current of vertical direction to break the steam film be gathered in bottom forging, increase heat exchange coefficient, thus ensure that bottom obtains enough rate of cooling;
The object of this step is that the hypersaturated state of sosoloid is at room temperature maintained, thus the mechanical property needed for obtaining.
After employing the present invention heat-treats the 0Cr19Ni10 cheese forging that AP1000 nuclear in-pile component wall thickness is 400mm, the mechanical performance index of the forging obtained is as shown in table 1:
Table 1
As can be seen from Table 1, the tensile strength properties of the forging after thermal treatment at 350 DEG C reaches 480MPa, far exceedes design specifications and requires (>=370MPa), have larger surplus capacity.
In addition, the homogeneous microstructure of forging after thermal treatment, does not all find tiny crack through ultrasound examination, liquid penetration examination.
Claims (3)
1. a nuclear in-pile component heat treating method for austenitic stainless steel cheese forging, is characterized in that, for being 0Cr19Ni10 to material, diameter is not less than 4000mm, and the solid forging that thickness is not less than 400mm is heat-treated, and comprises the following steps:
The first step, is placed in heat treatment furnace by forging, is heated to 400 ~ 450 DEG C of scope inside holding with the peak power of heat treatment furnace, and soaking time is every 1 millimeter of forging thickness insulation 0.5 ~ 1 minute;
Second step, continues heated parts, with the heat-up rate being not more than 50 DEG C/h, forging is heated to 670 ~ 700 DEG C of scope inside holding, and soaking time is every 1 millimeter of forging thickness insulation 0.5 ~ 1 minute;
3rd step, continues heated parts, with the heat-up rate being not more than 150 DEG C/h, forging is heated to 1040 ~ 1080 DEG C of scope inside holding, and soaking time is every 1 millimeter of forging thickness insulation 3 ~ 5 minutes;
4th step, forging is come out of the stove and water-cooled.
2. the heat treating method of nuclear in-pile component austenitic stainless steel cheese forging according to claim 1, is characterized in that: the method for described 4th step water-cooled is: the initial temperature of water coolant is not higher than 30 DEG C; At bottom of gullet setting current drive unit vertically upward, the current of vertical direction are utilized to break the steam film be gathered in bottom forging.
3. the heat treating method of nuclear in-pile component austenitic stainless steel cheese forging according to claim 1 and 2, is characterized in that: after described 4th step water-cooled, the surface temperature of forging water outlet after 15 minutes be not higher than 80 DEG C.
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| CN104674144B (en) * | 2015-02-28 | 2016-10-05 | 钢铁研究总院 | Nuclear power heap large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece heat treatment method |
| CN105057523A (en) * | 2015-07-20 | 2015-11-18 | 安徽蓝博旺机械集团合诚机械有限公司 | Method for producing roller for forklift steering axle |
| CN105328095A (en) * | 2015-07-29 | 2016-02-17 | 江阴南工锻造有限公司 | Low-carbon high-alloy steel forging technology |
| CN106077379B (en) * | 2016-06-20 | 2019-09-27 | 安徽省瑞杰锻造有限责任公司 | A kind of forging technology of 0Cr23Ni13 heat-resistance stainless steel |
| CN107746924B (en) * | 2017-11-01 | 2019-05-14 | 山东伊莱特重工股份有限公司 | A kind of method of large size austenitic stainless steel ring forging heat treatment deformation |
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| JPS58144420A (en) * | 1982-02-19 | 1983-08-27 | Kawasaki Steel Corp | Method of making large-sized austenitic stainless forged steel |
| CN101368227A (en) * | 2007-08-17 | 2009-02-18 | 上海重型机器厂有限公司 | Thermal treatment method for nuclear in-pile component |
| CN201296767Y (en) * | 2008-10-15 | 2009-08-26 | 常州市武进第二法兰锻造有限公司 | Thermal treatment quenching bath |
| CN101906523A (en) * | 2009-06-02 | 2010-12-08 | 上海重型机器厂有限公司 | Heat treatment process of nuclear power reactor pressure vessel reactor core cylinder forgings |
| CN102703662A (en) * | 2012-06-11 | 2012-10-03 | 张家港海陆环形锻件有限公司 | Device for quenching ring forging |
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| JPS58144420A (en) * | 1982-02-19 | 1983-08-27 | Kawasaki Steel Corp | Method of making large-sized austenitic stainless forged steel |
| CN101368227A (en) * | 2007-08-17 | 2009-02-18 | 上海重型机器厂有限公司 | Thermal treatment method for nuclear in-pile component |
| CN201296767Y (en) * | 2008-10-15 | 2009-08-26 | 常州市武进第二法兰锻造有限公司 | Thermal treatment quenching bath |
| CN101906523A (en) * | 2009-06-02 | 2010-12-08 | 上海重型机器厂有限公司 | Heat treatment process of nuclear power reactor pressure vessel reactor core cylinder forgings |
| CN102703662A (en) * | 2012-06-11 | 2012-10-03 | 张家港海陆环形锻件有限公司 | Device for quenching ring forging |
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Effective date of registration: 20161130 Address after: 200245 Jiangchuan Road, Shanghai, No. 207, building 1800, No. Patentee after: Shanghai Electric Heavy Forging Co. Ltd. Patentee after: Shanghai Heavy Machines Plant Co., Ltd. Address before: 200245 Jiangchuan Road, Shanghai, No. 1800, No. Patentee before: Shanghai Heavy Machines Plant Co., Ltd. |