CN101797623A - Forging method of steam generator primary side connection pipe safety end and witness piece - Google Patents
Forging method of steam generator primary side connection pipe safety end and witness piece Download PDFInfo
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- CN101797623A CN101797623A CN200910247956A CN200910247956A CN101797623A CN 101797623 A CN101797623 A CN 101797623A CN 200910247956 A CN200910247956 A CN 200910247956A CN 200910247956 A CN200910247956 A CN 200910247956A CN 101797623 A CN101797623 A CN 101797623A
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Abstract
The invention relates to the technical field of forging, in particular to forging method of a nuclear power plant steam generator nitrogen controlling stainless steel primary side pipe safety end and a witness piece thereof; the method comprises the following steps that: an appropriate steel ingot is selected, and the steel ingot is repeatedly upset and stretched at 1180 to 900DEG C, so that the forging ratio is no less than 4; afterwards, rough processing before heat treatment, performance heat treatment and machining after heat treatment are carried out sequentially, to prepare the primary side pipe safety end and the witness piece thereof; the forging method has the advantages that all properties of the primary side pipe safety end and the witness piece thereof which are manufactured by the method meet the standard requirements of RCC-M, thereby ensuring the use requirement on the use of the primary side pipe safety end and the witness piece thereof of a nuclear power plant steam generator, greatly improving the safety and the reliability, and meeting the technical requirements of this type of products.
Description
Technical field
The present invention relates to technical field of forging, especially relate to a kind of forging method that nuclear power station steam generator control nitrogen stainless steel primary side is taken over safe end and witness spare thereof that is used for.
Background technology
In recent years, power shortages have become the bottleneck that the restriction China's economic grows continuously and fast, and as energy savings and the important behave of readjusting the energy structure, nuclear power has been included State Grid's development plan in.The history in year surplus the development of China's nuclear power cause existing 30 always based on research of nuclear power equipment and trial-production on a small scale, forms ripe manufacturing technology and produces equipment capability.Therefore, the nuclear power developing of China just develops towards high-power direction.
At present, the employed forge piece of million kilowatt nuclear power construction project, as be used for that nuclear power station steam generator control nitrogen stainless steel primary side is taken over safe end and primary side is taken over safe end witness spare, because its special Service Environment, performance requirement to forging is very high, and general heat treatment method is handled can not reach standard.And present above-mentioned nuclear power can't be realized production domesticization with taking over safe end and witness spare thereof, multidirectionally abroad orders.
Summary of the invention
The objective of the invention is according to above-mentioned the deficiencies in the prior art part, the forging method that provides a kind of primary side of steam generator to take over safe end and witness spare, this method satisfies the adapter safe end of nuclear power station user demand and the forging method of witness spare by accurate setting forging and heat treatment period, temperature manufacturing.
In order to solve the problems of the technologies described above, the object of the invention realizes being finished by following technical scheme:
A kind of primary side of steam generator is taken over the forging method of safe end and witness spare, it is characterized in that having following steps:
A) preparation and casting have the steel ingot of following percentage by weight: trace≤C≤0.035%, trace≤Si≤1.00%, trace≤Mn≤2.00%, trace≤P≤0.030%, trace≤S≤0.015%, 17.00%≤Cr≤18.20%, 2.25%≤Mn≤2.75%, trace≤Cu≤1.00%, trace≤B≤0.0018%, 11.50%≤Ni≤12.50%, trace≤N≤0.080%, trace≤Co≤0.10%, surplus are Fe and unavoidable impurities;
B) steel ingot described in the step a) is heated to 450 ℃, insulation 2.5h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3h afterwards and make its temperature reach 1180 ℃, blanking behind the insulation 2.5h;
C) in 1200 ℃-900 ℃ temperature range, forge the base substrate that is used for described primary side adapter safe end and witness spare;
D) the described base substrate that generates in the step c) is carried out roughing;
E) the described base substrate that generates in the step d) is heated to 1050 ℃-1080 ℃ temperature range and be incubated 0.5-3h, water-cooled is to not being higher than 100 ℃ of water outlets afterwards;
F) base substrate that generates in the step e) is carried out machined to make described safe end and witness spare.
The concrete steps of step c) are: the workpiece that step b) generated is heated to 1180 ℃ as initial forging temperature, and pull out-jumping-up, round as a ball afterwards, alignment, correction size make forging ratio be not less than 4, be used for the base substrate that described primary side is taken over safe end and witness spare with forging, its final forging temperature is not less than 900 ℃.
The forging that said method generated at room temperature, its hot strength is 576-588Mpa, its yield strength of 0.2 is not less than 286Mpa, its percentage elongation δ is not less than 56%.
Base substrate described in the step e) is the pipe of internal diameter 743mm, external diameter 1021mm, length 550mm.
Base substrate described in the step e) is the pipe of internal diameter 710mm, external diameter 1045mm, length 560mm.
The specific requirement of water-cooled is in the step e): described billet surface temperature dropped to 427 ℃ in 3 minutes, and water-cooled is 60 minutes afterwards.
The invention has the beneficial effects as follows: adopt the primary side of steam generator adapter safe end of manufacturing of the present invention and the standard-required that the every performance indications of witness spare all satisfy RCC-M, guaranteed to be used for the instructions for use that primary side of steam generator of nuclear power plant is taken over safe end and witness spare thereof, its security, reliability are greatly promoted, satisfied the technical need of this series products.
Description of drawings
Fig. 1 is that the embodiment of the invention 1 is taken over safe end and witness spare cutaway view thereof.
The specific embodiment
The present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technical staff's of the same trade understanding:
As shown in Figure 1, label 1-2 represents respectively: take over safe end 1, witness spare 2.
As shown in Figure 1, the adapter safe end 1 of manufacturing of the present invention and witness spare 2 thereof are the identical hollow circular ring of size dimension, the internal diameter of the two be 753mm, external diameter be 1011mm, wall thickness be 129mm, highly for 180mm.
Its forging steel ingot selects 22 " square ingot, the chemical composition of its material should satisfy following requirement:
Trace≤C≤0.035%, trace≤Si≤1.00%, trace≤Mn≤2.00%, trace≤P≤0.030%, trace≤S≤0.015%, 17.00%≤Cr≤18.20%, 2.25%≤Mn≤2.75%, trace≤Cu≤1.00%, trace≤B≤0.0018%, 11.50%≤Ni≤12.50%, trace≤N≤0.080%, trace≤Co≤0.10%, surplus are Fe and unavoidable impurities.
During fabrication, it is measure-alike to take over safe end 1 and witness spare 2, so said two devices can be forged together.Owing to forge the back examination of materials, also need to forge the evaluation ring, so each forging length of forging is 550mm.
Because size, the weight of forging and the material of selecting for use thereof are determining the selection of each parameter of Forging Technology, so at above-mentioned adapter safe end 1, witness spare 2, following examples are described in detail for the manufacturing process of this Venturi tube.
Embodiment 1: the requirement of manufacturing process is in the present embodiment:
1. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
A) steel ingot described in the step a) is heated to 450 ℃, insulation 2.5h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3h afterwards and make its temperature reach 1180 ℃, blanking behind the insulation 2.5h.
B) workpiece is heated to 1180 ℃ as initial forging temperature, and pull out-jumping-up, round as a ball afterwards, punching, reaming, saddle support reaming, rammer planar end surface, revise size and make forging ratio be not less than 4, be used for the base substrate that described primary side is taken over safe end and witness spare with forging, its final forging temperature is not less than 900 ℃.
2. roughing before the heat treatment: base substrate before heat treatment on request size carry out roughing.
3. property heat treatment: base substrate is heated to 1050 ℃ temperature range and is incubated 0.5h, and water-cooled is to not being higher than 100 ℃ of water outlets afterwards.
Key points for operation: described billet surface temperature dropped to 427 ℃ in 3 minutes, and water-cooled is 60 minutes afterwards.
4. machined after the heat treatment: base substrate carries out machined and takes over safe end 1 and witness spare 2 to make, and for the removal of defect area, allows or not to carry out any soldering with polishing method removal of defects under the requirement that does not influence the forging mechanical property.
Embodiment 2: the requirement of manufacturing process is in the present embodiment:
1. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
A) steel ingot described in the step a) is heated to 450 ℃, insulation 2.5h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3h afterwards and make its temperature reach 1180 ℃, blanking behind the insulation 2.5h.
B) workpiece is heated to 1180 ℃ as initial forging temperature, and pull out-jumping-up, round as a ball afterwards, punching, reaming, saddle support reaming, rammer planar end surface, revise size and make forging ratio be not less than 4, be used for the base substrate that described primary side is taken over safe end and witness spare with forging, its final forging temperature is not less than 900 ℃.
2. roughing before the heat treatment: base substrate before heat treatment on request size carry out roughing.
3. property heat treatment: base substrate is heated to 1055 ℃ temperature range and is incubated 1h, and water-cooled is to not being higher than 100 ℃ of water outlets afterwards.
Key points for operation: described billet surface temperature dropped to 427 ℃ in 3 minutes, and water-cooled is 60 minutes afterwards.
Machined after the heat treatment: base substrate carries out machined and takes over safe end 1 and witness spare 2 to make, and for the removal of defect area, allows or not to carry out any soldering with polishing method removal of defects under the requirement that does not influence the forging mechanical property.
Embodiment 3: the requirement of manufacturing process is in the present embodiment:
1. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
A) steel ingot described in the step a) is heated to 450 ℃, insulation 2.5h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3h afterwards and make its temperature reach 1180 ℃, blanking behind the insulation 2.5h.
B) workpiece is heated to 1180 ℃ as initial forging temperature, and pull out-jumping-up, round as a ball afterwards, punching, reaming, saddle support reaming, rammer planar end surface, revise size and make forging ratio be not less than 4, be used for the base substrate that described primary side is taken over safe end and witness spare with forging, its final forging temperature is not less than 900 ℃.
2. roughing before the heat treatment: base substrate before heat treatment on request size carry out roughing.
3. property heat treatment: base substrate is heated to 1060 ℃ temperature range and is incubated 1.5h, and water-cooled is to not being higher than 100 ℃ of water outlets afterwards.
Key points for operation: described billet surface temperature dropped to 427 ℃ in 3 minutes, and water-cooled is 60 minutes afterwards.
Machined after the heat treatment: base substrate carries out machined and takes over safe end 1 and witness spare 2 to make, and for the removal of defect area, allows or not to carry out any soldering with polishing method removal of defects under the requirement that does not influence the forging mechanical property.
Embodiment 4: the requirement of manufacturing process is in the present embodiment:
1. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
A) steel ingot described in the step a) is heated to 450 ℃, insulation 2.5h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3h afterwards and make its temperature reach 1180 ℃, blanking behind the insulation 2.5h.
B) workpiece is heated to 1180 ℃ as initial forging temperature, and pull out-jumping-up, round as a ball afterwards, punching, reaming, saddle support reaming, rammer planar end surface, revise size and make forging ratio be not less than 4, be used for the base substrate that described primary side is taken over safe end and witness spare with forging, its final forging temperature is not less than 900 ℃.
2. roughing before the heat treatment: base substrate before heat treatment on request size carry out roughing.
3. property heat treatment: base substrate is heated to 1070 ℃ temperature range and is incubated 2h, and water-cooled is to not being higher than 100 ℃ of water outlets afterwards.
Key points for operation: described billet surface temperature dropped to 427 ℃ in 3 minutes, and water-cooled is 60 minutes afterwards.
Machined after the heat treatment: base substrate carries out machined and takes over safe end 1 and witness spare 2 to make, and for the removal of defect area, allows or not to carry out any soldering with polishing method removal of defects under the requirement that does not influence the forging mechanical property.
Embodiment 5: the requirement of manufacturing process is in the present embodiment:
1. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
A) steel ingot described in the step a) is heated to 450 ℃, insulation 2.5h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3h afterwards and make its temperature reach 1180 ℃, blanking behind the insulation 2.5h.
B) workpiece is heated to 1180 ℃ as initial forging temperature, and pull out-jumping-up, round as a ball afterwards, punching, reaming, saddle support reaming, rammer planar end surface, revise size and make forging ratio be not less than 4, be used for the base substrate that described primary side is taken over safe end and witness spare with forging, its final forging temperature is not less than 900 ℃.
2. roughing before the heat treatment: base substrate before heat treatment on request size carry out roughing.
3. property heat treatment: base substrate is heated to 1080 ℃ temperature range and is incubated 3h, and water-cooled is to not being higher than 100 ℃ of water outlets afterwards.
Key points for operation: described billet surface temperature dropped to 427 ℃ in 3 minutes, and water-cooled is 60 minutes afterwards.
Machined after the heat treatment: base substrate carries out machined and takes over safe end 1 and witness spare 2 to make, and for the removal of defect area, allows or not to carry out any soldering with polishing method removal of defects under the requirement that does not influence the forging mechanical property.
After adopting technical scheme among above-mentioned 5 embodiment to complete, test to obtain data shown in the following table for forging:
Mechanical performance
Adopt the primary side of steam generator adapter safe end of manufacturing of the present invention and the standard-required that the every performance indications of witness spare all satisfy RCC-M, guaranteed to be used for the instructions for use that primary side of steam generator of nuclear power plant is taken over safe end and witness spare thereof, its security, reliability are greatly promoted, satisfied the technical need of this series products.
Claims (6)
1. a primary side of steam generator is taken over the forging method of safe end and witness spare, it is characterized in that having following steps:
A) preparation and casting have the steel ingot of following percentage by weight: trace≤C≤0.035%, trace≤Si≤1.00%, trace≤Mn≤2.00%, trace≤P≤0.030%, trace≤S≤0.015%, 17.00%≤Cr≤18.20%, 2.25%≤Mn≤2.75%, trace≤Cu≤1.00%, trace≤B≤0.0018%, 11.50%≤Ni≤12.50%, trace≤N≤0.080%, trace≤Co≤0.10%, surplus are Fe and unavoidable impurities;
B) steel ingot described in the step a) is heated to 450 ℃, insulation 2.5h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3h afterwards and make its temperature reach 1180 ℃, blanking behind the insulation 2.5h;
C) in 1180 ℃-900 ℃ temperature range, forge the base substrate that is used for described primary side adapter safe end and witness spare;
D) the described base substrate that generates in the step c) is carried out roughing;
E) the described base substrate that generates in the step d) is heated to 1050 ℃-1080 ℃ temperature range and be incubated 0.5-3h, water-cooled is to not being higher than 100 ℃ of water outlets afterwards;
F) base substrate that generates in the step e) is carried out machined to make described safe end and witness spare.
2. a kind of primary side of steam generator according to claim 1 is taken over the forging method of safe end and witness spare, the concrete steps that it is characterized in that step c) are: the workpiece that step b) generated is heated to 1180 ℃ as initial forging temperature, and pull out-jumping-up, round as a ball afterwards, punching, reaming, saddle support reaming, rammer planar end surface, revise size and make forging ratio be not less than 4, be used for the base substrate that described primary side is taken over safe end and witness spare with forging, its final forging temperature is not less than 900 ℃.
3. a kind of primary side of steam generator according to claim 1 is taken over the forging method of safe end and witness spare, and it is characterized in that: base substrate described in the step e) is the pipe of internal diameter 743mm, external diameter 1021mm, length 550mm.
4. a kind of primary side of steam generator according to claim 1 is taken over the forging method of safe end and witness spare, and it is characterized in that: base substrate described in the step e) is the pipe of internal diameter 710mm, external diameter 1045mm, length 560mm.
5. a kind of primary side of steam generator according to claim 1 is taken over the forging method of safe end and witness spare, and it is characterized in that the specific requirement of water-cooled is in the step e): described billet surface temperature dropped to 427 ℃ in 3 minutes, and water-cooled is 60 minutes afterwards.
6. a kind of primary side of steam generator according to claim 1 is taken over the forging method of safe end and witness spare, it is characterized in that described forging at room temperature, its hot strength is 576-588Mpa, and its yield strength of 0.2 is not less than 286Mpa, and its percentage elongation δ is not less than 56%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910247956A CN101797623A (en) | 2009-12-31 | 2009-12-31 | Forging method of steam generator primary side connection pipe safety end and witness piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910247956A CN101797623A (en) | 2009-12-31 | 2009-12-31 | Forging method of steam generator primary side connection pipe safety end and witness piece |
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| CN101797623A true CN101797623A (en) | 2010-08-11 |
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| CN200910247956A Pending CN101797623A (en) | 2009-12-31 | 2009-12-31 | Forging method of steam generator primary side connection pipe safety end and witness piece |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102319848A (en) * | 2011-09-02 | 2012-01-18 | 上海新闵重型锻造有限公司 | Primary side of steam generator is taken over the Forging Technology of witness spare and safe end |
| CN102825207A (en) * | 2011-06-13 | 2012-12-19 | 鞍钢重型机械有限责任公司 | Forging process of main stainless-steel pipeline for nuclear power |
| CN105057560A (en) * | 2015-07-20 | 2015-11-18 | 安徽蓝博旺机械集团振邺机械有限公司 | Forging method for drive axle lifting oil cylinder |
| CN109961859A (en) * | 2017-12-14 | 2019-07-02 | 中国核动力研究设计院 | A kind of nuclear power main equipment safe end and its manufacturing process |
-
2009
- 2009-12-31 CN CN200910247956A patent/CN101797623A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825207A (en) * | 2011-06-13 | 2012-12-19 | 鞍钢重型机械有限责任公司 | Forging process of main stainless-steel pipeline for nuclear power |
| CN102825207B (en) * | 2011-06-13 | 2015-12-02 | 鞍钢重型机械有限责任公司 | A kind of stainless steel main nuclear power pipeline Forging Technology |
| CN102319848A (en) * | 2011-09-02 | 2012-01-18 | 上海新闵重型锻造有限公司 | Primary side of steam generator is taken over the Forging Technology of witness spare and safe end |
| CN105057560A (en) * | 2015-07-20 | 2015-11-18 | 安徽蓝博旺机械集团振邺机械有限公司 | Forging method for drive axle lifting oil cylinder |
| CN109961859A (en) * | 2017-12-14 | 2019-07-02 | 中国核动力研究设计院 | A kind of nuclear power main equipment safe end and its manufacturing process |
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Open date: 20100811 |