CN103820630A - Heat treatment method for austenitic stainless steel pie forgings for nuclear power reactor internals - Google Patents
Heat treatment method for austenitic stainless steel pie forgings for nuclear power reactor internals Download PDFInfo
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- CN103820630A CN103820630A CN201210470101.6A CN201210470101A CN103820630A CN 103820630 A CN103820630 A CN 103820630A CN 201210470101 A CN201210470101 A CN 201210470101A CN 103820630 A CN103820630 A CN 103820630A
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Abstract
The invention discloses a heat treatment method for austenitic stainless steel pie forgings for nuclear power reactor internals. The method is used for performing heat treatment on a solid forging, the material of the solid forging is 0Cr19Ni10, the diameter of the material is not smaller than 4000 mm, and the thickness of the material is not smaller than 400 mm. The method comprises the following steps: step 1, heating the forging to 400-450 DEG C for preserving heat by using the maximum power of a heat treatment furnace, wherein the preserving heat time is 0.5-1 minute for each millimeter of forging thickness; step 2, heating the forging to 670-700 DEG C for preserving heat at the temperature rise rate of at most 50 DEG C/h, wherein the preserving heat time is 0.5-1 minute for each millimeter of forging thickness; step 3, heating the forging to 1040-1080 DEG C for preserving heat at the temperature rise rate of at most 150 DEG C/h, wherein the preserving heat time is 3-5 minutes for each millimeter of forging thickness; step 4, discharging the forging from the furnace and cooling with water. The crystalline grains of the 0Cr19Ni10 steel forging subjected to heat treatment by the method are not grown, organization is uniform, and the strength of room temperature and 350 DEG C of high temperature meets the design requirement of the nuclear power reactor internals.
Description
Technical field
The present invention relates to a kind of heat treating method, be specifically related to the heat treating method of a kind of nuclear in-pile component austenitic stainless steel cheese forging.
Background technology
Along with rapid development of economy, the demand sharp increase of various countries to 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 and maximizes and integrated feature compared with heap type with other morning, 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, for nuclear fuel assembly provides support and compresses, simultaneously also for pressurized vessel provides shielding, makes the impact of its few raying.In-pile component in AP1000 pressurized-water reactor mainly contains lower core plate and upper support board with austenitic stainless steel cheese forging, its diameter is about 4 meters, thickness exceedes 400mm, shield effectiveness is not only provided, but also plays the effect of balancing machine load and hydraulic load, they both directly contacted with refrigerant, nuclear fuel, directly accept corrosion and radiation, carry again huge and complicated pressure, service condition is very harsh, therefore high especially to the requirement of its security.
The selected material of heavy wall cheese forging of manufacturing in-pile component is austenitic stainless steel, and material mark is SA-336F304H, and in corresponding country, the trade mark is 0Cr19Ni10.The solution heat treatment parameter that ASME standard provides this material only has holding temperature to be not less than 1040 ℃, 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, the mechanical property of material has been proposed to requirements at the higher level: Rockwell hardness HRB is not not less than 125MPa higher than 92,350 ℃ of lower yield strengths.If the thermal treatment process described in use standard, the test-results of gained is that Rockwell hardness exceedes 100HRB, and the yield strength at 350 ℃ only has 100MPa, cannot guarantee the operation and maintenance of AP1000 nuclear power heap type.
Cheese forging is the forging of thermal treatment difficulty maximum in nuclear in-pile component, and major cause is relevant with its geometrical shape.Owing to being solid forging, in solid solution process of cooling, forging bottom is easily assembled steam film and is worsened cooling conditions.Practice shows, if do not adopted an effective measure, forging bottom and side at the same time in process of cooling the temperature difference can reach hundreds of ℃, thereby cause forging bottom poor-performing, worsen the homogeneity of forging performance.
Summary of the invention
Technical problem to be solved by this invention is to provide the heat treating method of a kind 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, nuclear in-pile component of the present invention by the technical solution of the heat treating method of austenitic stainless steel cheese forging is:
For being 0Cr19Ni10 to material, diameter is not less than 4000mm, and thickness is not less than the solid forging of 400mm heat-treats, and comprises the following steps:
The first step, is placed in heat treatment furnace by forging, is heated to be incubated within the scope of 400～450 ℃ 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 that is not more than 50 ℃/h, forging is heated to be incubated within the scope of 670～700 ℃, and soaking time is every 1 millimeter of forging thickness insulation 0.5～1 minute;
The 3rd step, continues heated parts, with the heat-up rate that is not more than 150 ℃/h, forging is heated to be incubated within the scope of 1040～1080 ℃, and soaking time is every 1 millimeter of forging thickness insulation 3～5 minutes;
The 4th step, forging is come out of the stove and water-cooled.
The method of described the 4th step water-cooled is: the initial temperature of water coolant is not higher than 30 ℃; At bottom of gullet setting current drive unit vertically upward, utilize the current of vertical direction to break the steam film that is gathered in forging bottom.
After described the 4th step water-cooled, the surface temperature of forging water outlet after 15 minutes be not higher than 80 ℃.
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 the phenomenon of growing up and homogeneous microstructure, room temperature and 350 ℃ of hot strengths meet nuclear in-pile component design requirements, and surplus capacity is larger, the performance at two ends is even, and grain fineness number does not have obviously grows up, defect reflection signal is not found in ultrasound examination, liquid infiltration detects and does not find defect vestige, all qualified, can guarantee 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 of the present invention austenitic stainless steel cheese forging.
Embodiment
As shown in Figure 1, the heat treating method of austenitic stainless steel cheese forging for nuclear in-pile component of the present invention, for being 0Cr19Ni10 to material, diameter is not less than 4000mm, and thickness is not less than the solid forging of 400mm heat-treats, and comprises the following steps:
The first step, is placed in heat treatment furnace by forging, is heated to be incubated within the scope of 400～450 ℃ 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 is to control the surface of forging and the temperature head of heart portion, the forging cracking of avoiding blue shortness to cause;
Second step, continues heated parts, with the heat-up rate that is not more than 50 ℃/h, forging is heated to be incubated within the scope of 670～700 ℃, and soaking time is every 1 millimeter of forging thickness insulation 0.5～1 minute;
The object of this step is the temperature head of dwindling workpiece surface and heart portion, on the one hand weakens thermal stresses and avoid the appearance of tiny crack, improves on the other hand heating efficiency;
The 3rd step, continues heated parts, with the heat-up rate that is not more than 150 ℃/h, forging is heated to be incubated within the scope of 1040～1080 ℃, 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 is to reduce actual Ovshinsky soaking time, prevents grain growth; Austenitizing holding temperature higher than 1080 ℃ will cause grain growth, and the heat-up rate that is not more than 150 ℃/h can effectively prevent grain growth;
The 4th step, forging is come out of the stove and is cooling, and the type of cooling is water-cooled; 15 minutes rear surface temperature of forging water outlet are not higher than 80 ℃;
For guaranteeing enough cooling rates, the method for water-cooled is as follows:
The initial temperature of water coolant is not higher than 30 ℃; At bottom of gullet setting current drive unit vertically upward, utilize the current of vertical direction to break the steam film that is gathered in forging bottom, increase heat exchange coefficient, thereby guarantee that bottom obtains enough rate of cooling;
The object of this step is that the hypersaturated state of sosoloid is at room temperature maintained, thereby obtains required mechanical property.
After the 0Cr19Ni10 cheese forging that employing the present invention is 400mm to AP1000 nuclear in-pile component wall thickness is heat-treated, the mechanical performance index of the forging obtaining 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 ℃ reaches 480MPa, far exceedes design specifications and requires (>=370MPa), has larger surplus capacity.
In addition, the homogeneous microstructure of forging after thermal treatment, detects and does not all find tiny crack through ultrasound examination, liquid infiltration.
Claims (3)
1. a heat treating method for austenitic stainless steel cheese forging for nuclear in-pile component, is characterized in that, for being 0Cr19Ni10 to material, diameter is not less than 4000mm, and thickness is not less than the solid forging of 400mm heat-treats, and comprises the following steps:
The first step, is placed in heat treatment furnace by forging, is heated to be incubated within the scope of 400～450 ℃ 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 that is not more than 50 ℃/h, forging is heated to be incubated within the scope of 670～700 ℃, and soaking time is every 1 millimeter of forging thickness insulation 0.5～1 minute;
The 3rd step, continues heated parts, with the heat-up rate that is not more than 150 ℃/h, forging is heated to be incubated within the scope of 1040～1080 ℃, and soaking time is every 1 millimeter of forging thickness insulation 3～5 minutes;
The 4th step, forging is come out of the stove and water-cooled.
2. the heat treating method of austenitic stainless steel cheese forging for nuclear in-pile component according to claim 1, is characterized in that: the method for described the 4th step water-cooled is: the initial temperature of water coolant is not higher than 30 ℃; At bottom of gullet setting current drive unit vertically upward, utilize the current of vertical direction to break the steam film that is gathered in forging bottom.
3. the heat treating method of austenitic stainless steel cheese forging for nuclear in-pile component according to claim 1 and 2, is characterized in that: after described the 4th step water-cooled, the surface temperature of forging water outlet after 15 minutes be not higher than 80 ℃.
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Cited By (5)
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| CN104674144A (en) * | 2015-02-28 | 2015-06-03 | 钢铁研究总院 | Heat treatment method of large-size, high-strength and fine-grain nickel-based superalloy forge piece for nuclear reactor |
| 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 |
| CN106077379A (en) * | 2016-06-20 | 2016-11-09 | 安徽省瑞杰锻造有限责任公司 | A kind of Forging Technology of 0Cr23Ni13 heat-resistance stainless steel |
| CN107746924A (en) * | 2017-11-01 | 2018-03-02 | 山东伊莱特重工股份有限公司 | A kind of method of large-scale austenitic stainless steel ring forging heat treatment deformation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104674144A (en) * | 2015-02-28 | 2015-06-03 | 钢铁研究总院 | Heat treatment method of large-size, high-strength and fine-grain nickel-based superalloy forge piece for nuclear reactor |
| 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 |
| CN106077379A (en) * | 2016-06-20 | 2016-11-09 | 安徽省瑞杰锻造有限责任公司 | A kind of Forging Technology of 0Cr23Ni13 heat-resistance stainless steel |
| 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 |
| CN107746924A (en) * | 2017-11-01 | 2018-03-02 | 山东伊莱特重工股份有限公司 | A kind of method of large-scale austenitic stainless steel ring forging heat treatment deformation |
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| CN103820630B (en) | 2016-04-27 |
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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. |