CN101780519B - Forging method of forge piece for safe end of reactor pressure vessel - Google Patents
Forging method of forge piece for safe end of reactor pressure vessel Download PDFInfo
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- CN101780519B CN101780519B CN2009102479556A CN200910247955A CN101780519B CN 101780519 B CN101780519 B CN 101780519B CN 2009102479556 A CN2009102479556 A CN 2009102479556A CN 200910247955 A CN200910247955 A CN 200910247955A CN 101780519 B CN101780519 B CN 101780519B
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Abstract
The invention relate to a forging method of a forge piece for the safe end of a reactor pressure vessel, belonging to the technical field of forging. The forging method comprises the following steps of: selecting a proper steel ingot; repeatedly upsetting-drawing the steel ingot at the temperature ranging from 1180 DEG C to 900 DEG C so that a forging ratio is not less than 4; and then sequentially carrying out property heat treatment and machining after the heat treatment to obtain a supporting seat forge piece. The forge piece for the safe end of the reactor pressure vessel, which is manufactured by using the forging method, has actual grain size finer than that a third grade and various property indexes reaching the standard requirements of a Radio Chemical Centre (RCC-M) and an American Society for Testing Material (ASTM), ensures the utilization requirements of the forge piece for the safe end of the reactor pressure vessel in a nuclear power station, greatly enhances the safety and the reliability of the forge piece and meets the technical requirements of such products.
Description
Technical field
The present invention relates to technical field of forging, especially relate to a kind of forging method that is used for nuclear power plant reactor pressure vessel safety end with forging
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 heavy casting and forging of million kilowatt nuclear power construction project, as be used for forge piece for safe end of reactor pressure vessel, because its special Service Environment is very high to the performance requirement of forging, general heat treatment method is handled can not reach standard.And present above-mentioned nuclear power can't be realized production domesticization with bearing support forge piece, multidirectionally abroad orders.
Summary of the invention
The objective of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of forging method of forge piece for safe end of reactor pressure vessel is provided, and this method satisfies the forge piece for safe end of reactor pressure vessel of nuclear power station user demand 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 forging method of forge piece for safe end of reactor pressure vessel, described forging include discharge connection safe end, discharge connection safe end welding witness spare and entrance sleeve safe end, it is characterized in that having following steps:
A) selection has the steel ingot of following percentage by weight: trace≤C≤0.35%, trace≤Si≤0.80%, trace≤Mn≤2.00%, trace≤P≤0.020%, trace≤S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%, trace≤N≤0.080%, trace≤B≤0.0010%, trace≤Cu≤0.50%, trace≤Co≤0.10%, trace≤Nb+Ta≤0.15%, surplus is Fe and unavoidable impurities;
B) in 1180 ℃-900 ℃ temperature range, with in the step b) the workpiece that generates jumping-up-pulling repeatedly, round as a ball afterwards, punching, reaming, saddle support reaming, revise size and make forging ratio be not less than 4, be used for the base substrate of described forging with forging;
When the described billet surface temperature that c) generates in step b) is not higher than 500 ℃, described base substrate is heated to 1050 ℃-1060 ℃ temperature range and is incubated 3-6h, water-cooled is not come out of the stove to not being higher than 100 ℃ afterwards;
D) base substrate that generates in the step c) is carried out machined to make described forging.
When described discharge connection safe end forged separately, the concrete steps of step b) were in its manufacture process:
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 4h; Heat 3h afterwards and make its temperature reach 1180 ℃, insulation 2h, and in this process, pull out-jumping-up, the forging ratio of described upsetting process is 1.5, the forging ratio of described pulling process is 2.2;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also carries out jumping-up, round as a ball, and the forging ratio of described upsetting process is 1.7;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and punching, reaming;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.4.
When described discharge connection safe end, discharge connection safe end welding witness spare forged as one, the concrete steps of step b) were in its manufacture process:
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3h afterwards and make its temperature reach 1180 ℃, insulation 2h, and in this process, carry out jumping-up, the forging ratio of described upsetting process is 1.5;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also pulls out, and the forging ratio of described pulling process is 2.1;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and also carry out jumping-up, the forging ratio of described upsetting process is 1.5;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 2h and punching, reaming;
5) workpiece that generates in the step 4) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.4.
When described entrance sleeve safe end forged, the concrete steps of step b) were in its manufacture process:
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3.5h afterwards and make its temperature reach 1180 ℃, insulation 2.5h, and in this process, carry out jumping-up, the forging ratio of described upsetting process is 1.3;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also pulls out, and the forging ratio of described pulling process is 2.1;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and also carry out jumping-up, the forging ratio of described upsetting process is 1.4;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 2h and punching, reaming;
5) workpiece that generates in the step 4) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.3.
When described discharge connection safe end forged separately, the temperature retention time of step c) was 3h in its manufacture process.
In the step c): after described base substrate is come out of the stove, be transported to the cooling medium time to be no more than 55s; The concrete grammar of described water-cooled is that described base substrate is immersed in the tank, and immersion depth is no less than 1.5M and moves up and down, described tank ON cycle water, and water temperature is not higher than 50 ℃ in it.
The obtained forging of described method at room temperature, its hot strength is 588-601Mpa, its yield strength of 0.2 is not less than 288Mpa, its contraction percentage of area Ψ is not less than 56%.
A kind of discharge connection safe end, it is characterized in that described discharge connection safe end is that above any described method is made, it is used for reactor pressure vessel, and described discharge connection safe end is a hollow circular ring, and its internal diameter is that 697mm, external diameter are that 950mm, width are 142mm.
A kind of discharge connection safe end welding witness spare, it is characterized in that described discharge connection safe end welding witness spare is to be made according to above any described method, it is used for reactor pressure vessel, described discharge connection safe end welding witness spare is a hollow circular ring, and its internal diameter is that 697mm, external diameter are that 950mm, width are 250mm.
A kind of entrance sleeve safe end, it is characterized in that described entrance sleeve safe end is to be made according to above any described method, it is used for reactor pressure vessel, and described entrance sleeve safe end is a hollow circular ring, and its internal diameter is that 659mm, external diameter are that 910mm, width are 142mm.
The invention has the beneficial effects as follows: adopt the prior austenite grain size of the forge piece for safe end of reactor pressure vessel of manufacturing of the present invention to be narrower than 3 grades, every performance indications all satisfy the standard-required of RCC-M and ASTM, guaranteed of the instructions for use of nuclear power plant reactor pressure vessel safety end with forging, its security, reliability are greatly promoted, satisfied the technical need of this series products.
Description of drawings
Fig. 1 is an embodiment of the invention discharge connection safe end cutaway view;
Cutaway view when Fig. 2 is embodiment of the invention discharge connection safe end and the forging of discharge connection safe end welding witness spare one;
Fig. 3 is an embodiment of the invention entrance sleeve safe end cutaway view.
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 Figure 1-3, the forge piece for safe end of reactor pressure vessel of manufacturing of the present invention includes discharge connection safe end, discharge connection safe end welding witness spare and entrance sleeve safe end, the three is hollow circular ring, and wherein: the discharge connection internal diameter is that 697mm, external diameter are that 950mm, width are 142mm; Discharge connection safe end welding witness spare internal diameter is that 697mm, external diameter are that 950mm, width are 250mm; Entrance sleeve safe end internal diameter is that 659mm, external diameter are that 910mm, width are 142mm.
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 forging, following examples are described in detail for the manufacturing process of this forging.
Embodiment 1: present embodiment is discharge connection safe end manufacturing process when forging separately:
1. material is selected:
Select 19 " square ingot, 2200Kg/ props up, these are 19 years old " chemical composition of square ingot should meet following regulation:
Trace≤C≤0.35%, trace≤Si≤0.80%, trace≤Mn≤2.00%, trace≤P≤0.020%, trace≤S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%, trace≤N≤0.080%, trace≤B≤0.0010%, trace≤Cu≤0.50%, trace≤Co≤0.10%, trace≤Nb+Ta≤0.15%, surplus is Fe and unavoidable impurities.
2. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 4h; Heat 3h afterwards and make its temperature reach 1180 ℃, insulation 2h, and in this process, pull out-jumping-up, the forging ratio of described upsetting process is 1.5, the forging ratio of described pulling process is 2.2;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also carries out jumping-up, round as a ball, and the forging ratio of described upsetting process is 1.7;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and punching, reaming;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.4.
3. property heat treatment:
When the billet surface temperature is not higher than 500 ℃ after forging, base substrate is heated to 1050 ℃ temperature range and is incubated 3h, water-cooled is not come out of the stove to not being higher than 100 ℃ afterwards.
Key points for operation:
1. after workpiece is come out of the stove, workpiece handling to the cooling medium time is no more than 55 seconds.
2. when workpiece is gone into water cooling, ON cycle water, the water yield is opened greatly as far as possible; Water temperature≤50 ℃.
3. workpiece is immersed tank, immersion depth 〉=1.5M also moves up and down.
4. machined after the heat treatment: base substrate carries out machined to make described discharge connection safe end.For the removal of defect area, under the requirement that does not influence the forging mechanical property, allow to forbid on forging, to carry out any repair welding with polishing method removal of defects.
Embodiment 2: present embodiment is discharge connection safe end manufacturing process when forging separately:
1. material is selected:
Select 19 " square ingot, 2200Kg/ props up, these are 19 years old " chemical composition of square ingot should meet following regulation:
Trace≤C≤0.35%, trace≤Si≤0.80%, trace≤Mn≤2.00%, trace≤P≤0.020%, trace≤S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%, trace≤N≤0.080%, trace≤B≤0.0010%, trace≤Cu≤0.50%, trace≤Co≤0.10%, trace≤Nb+Ta≤0.15%, surplus is Fe and unavoidable impurities.
2. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 4h; Heat 3h afterwards and make its temperature reach 1180 ℃, insulation 2h, and in this process, pull out-jumping-up, the forging ratio of described upsetting process is 1.5, the forging ratio of described pulling process is 2.2;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also carries out jumping-up, round as a ball, and the forging ratio of described upsetting process is 1.7;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and punching, reaming;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.4.
3. property heat treatment:
When the billet surface temperature is not higher than 500 ℃ after forging, base substrate is heated to 1060 ℃ temperature range and is incubated 3h, water-cooled is not come out of the stove to not being higher than 100 ℃ afterwards.
Key points for operation:
1. after workpiece is come out of the stove, workpiece handling to the cooling medium time is no more than 55 seconds.
2. when workpiece is gone into water cooling, ON cycle water, the water yield is opened greatly as far as possible; Water temperature≤50 ℃.
3. workpiece is immersed tank, immersion depth 〉=1.5M also moves up and down.
4. machined after the heat treatment: base substrate carries out machined to make described discharge connection safe end.
For the removal of defect area, under the requirement that does not influence the forging mechanical property, allow to forbid on forging, to carry out any repair welding with polishing method removal of defects.
Embodiment 3: present embodiment is discharge connection safe end manufacturing process when forging separately:
1. material is selected:
Select 19 " square ingot, 2200Kg/ props up, these are 19 years old " chemical composition of square ingot should meet following regulation:
Trace≤C≤0.35%, trace≤Si≤0.80%, trace≤Mn≤2.00%, trace≤P≤0.020%, trace≤S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%, trace≤N≤0.080%, trace≤B≤0.0010%, trace≤Cu≤0.50%, trace≤Co≤0.10%, trace≤Nb+Ta≤0.15%, surplus is Fe and unavoidable impurities.
2. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 4h; Heat 3h afterwards and make its temperature reach 1180 ℃, insulation 2h, and in this process, pull out-jumping-up, the forging ratio of described upsetting process is 1.5, the forging ratio of described pulling process is 2.2;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also carries out jumping-up, round as a ball, and the forging ratio of described upsetting process is 1.7;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and punching, reaming;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.4.
3. property heat treatment:
When the billet surface temperature is not higher than 500 ℃ after forging, base substrate is heated to 1055 ℃ temperature range and is incubated 3h, water-cooled is not come out of the stove to not being higher than 100 ℃ afterwards.
Key points for operation:
1. after workpiece is come out of the stove, workpiece handling to the cooling medium time is no more than 55 seconds.
2. when workpiece is gone into water cooling, ON cycle water, the water yield is opened greatly as far as possible; Water temperature≤50 ℃.
3. workpiece is immersed tank, immersion depth 〉=1.5M also moves up and down.
4. machined after the heat treatment: base substrate carries out machined to make described discharge connection safe end.
For the removal of defect area, under the requirement that does not influence the forging mechanical property, allow to forbid on forging, to carry out any repair welding with polishing method removal of defects.
Embodiment 4: present embodiment is the discharge connection safe end, manufacturing process when discharge connection safe end welding witness spare forges as one:
1. material is selected:
Select 20 " square ingot, 2700Kg/ props up, these are 20 years old " chemical composition of square ingot should meet following regulation:
Trace≤C≤0.35%, trace≤Si≤0.80%, trace≤Mn≤2.00%, trace≤P≤0.020%, trace≤S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%, trace≤N≤0.080%, trace≤B≤0.0010%, trace≤Cu≤0.50%, trace≤Co≤0.10%, trace≤Nb+Ta≤0.15%, surplus is Fe and unavoidable impurities.
2. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3h afterwards and make its temperature reach 1180 ℃, insulation 2h, and in this process, carry out jumping-up, the forging ratio of described upsetting process is 1.5;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also pulls out, and the forging ratio of described pulling process is 2.1;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and also carry out jumping-up, the forging ratio of described upsetting process is 1.5;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 2h and punching, reaming;
5) workpiece that generates in the step 4) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.4.
3. property heat treatment:
When the billet surface temperature is not higher than 500 ℃ after forging, base substrate is heated to 1050 ℃ temperature range and is incubated 3h, water-cooled is not come out of the stove to not being higher than 100 ℃ afterwards.
Key points for operation:
1. after workpiece is come out of the stove, workpiece handling to the cooling medium time is no more than 55 seconds.
2. when workpiece is gone into water cooling, ON cycle water, the water yield is opened greatly as far as possible; Water temperature≤50 ℃.
3. workpiece is immersed tank, immersion depth 〉=1.5M also moves up and down.
4. machined after the heat treatment: base substrate carries out machined to make described discharge connection safe end.
For the removal of defect area, under the requirement that does not influence the forging mechanical property, allow to forbid on forging, to carry out any repair welding with polishing method removal of defects.
Embodiment 5: present embodiment is the discharge connection safe end, manufacturing process when discharge connection safe end welding witness spare forges as one:
1. material is selected:
Select 20 " square ingot, 2700Kg/ props up, these are 20 years old " chemical composition of square ingot should meet following regulation:
Trace≤C≤0.35%, trace≤Si≤0.80%, trace≤Mn≤2.00%, trace≤P≤0.020%, trace≤S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%, trace≤N≤0.080%, trace≤B≤0.0010%, trace≤Cu≤0.50%, trace≤Co≤0.10%, trace≤Nb+Ta≤0.15%, surplus is Fe and unavoidable impurities.
2. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3h afterwards and make its temperature reach 1180 ℃, insulation 2h, and in this process, carry out jumping-up, the forging ratio of described upsetting process is 1.5;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also pulls out, and the forging ratio of described pulling process is 2.1;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and also carry out jumping-up, the forging ratio of described upsetting process is 1.5;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 2h and punching, reaming;
5) workpiece that generates in the step 4) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.4.
3. property heat treatment:
When the billet surface temperature is not higher than 500 ℃ after forging, base substrate is heated to 1060 ℃ temperature range and is incubated 6h, water-cooled is not come out of the stove to not being higher than 100 ℃ afterwards.
Key points for operation:
1. after workpiece is come out of the stove, workpiece handling to the cooling medium time is no more than 55 seconds.
2. when workpiece is gone into water cooling, ON cycle water, the water yield is opened greatly as far as possible; Water temperature≤50 ℃.
3. workpiece is immersed tank, immersion depth 〉=1.5M also moves up and down.
4. machined after the heat treatment: base substrate carries out machined to make described discharge connection safe end.
For the removal of defect area, under the requirement that does not influence the forging mechanical property, allow to forbid on forging, to carry out any repair welding with polishing method removal of defects.
Embodiment 6: present embodiment is the discharge connection safe end, manufacturing process when discharge connection safe end welding witness spare forges as one:
1. material is selected:
Select 20 " square ingot, 2700Kg/ props up, these are 20 years old " chemical composition of square ingot should meet following regulation:
Trace≤C≤0.35%, trace≤Si≤0.80%, trace≤Mn≤2.00%, trace≤P≤0.020%, trace≤S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%, trace≤N≤0.080%, trace≤B≤0.0010%, trace≤Cu≤0.50%, trace≤Co≤0.10%, trace≤Nb+Ta≤0.15%, surplus is Fe and unavoidable impurities.
2. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3h afterwards and make its temperature reach 1180 ℃, insulation 2h, and in this process, carry out jumping-up, the forging ratio of described upsetting process is 1.5;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also pulls out, and the forging ratio of described pulling process is 2.1;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and also carry out jumping-up, the forging ratio of described upsetting process is 1.5;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 2h and punching, reaming;
5) workpiece that generates in the step 4) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.4.
3. property heat treatment:
When the billet surface temperature is not higher than 500 ℃ after forging, base substrate is heated to 1055 ℃ temperature range and is incubated 4.5h, water-cooled is not come out of the stove to not being higher than 100 ℃ afterwards.
Key points for operation:
1. after workpiece is come out of the stove, workpiece handling to the cooling medium time is no more than 55 seconds.
2. when workpiece is gone into water cooling, ON cycle water, the water yield is opened greatly as far as possible; Water temperature≤50 ℃.
3. workpiece is immersed tank, immersion depth 〉=1.5M also moves up and down.
4. machined after the heat treatment: base substrate carries out machined to make described discharge connection safe end.
For the removal of defect area, under the requirement that does not influence the forging mechanical property, allow to forbid on forging, to carry out any repair welding with polishing method removal of defects.
Embodiment 7: present embodiment is entrance sleeve safe end manufacturing process when forging separately:
1. material is selected:
Select 22 " square ingot, 2930Kg/ props up, these are 22 years old " chemical composition of square ingot should meet following regulation:
Trace≤C≤0.35%, trace≤Si≤0.80%, trace≤Mn≤2.00%, trace≤P≤0.020%, trace≤S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%, trace≤N≤0.080%, trace≤B≤0.0010%, trace≤Cu≤0.50%, trace≤Co≤0.10%, trace≤Nb+Ta≤0.15%, surplus is Fe and unavoidable impurities.
2. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3.5h afterwards and make its temperature reach 1180 ℃, insulation 2.5h, and in this process, carry out jumping-up, the forging ratio of described upsetting process is 1.3;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also pulls out, and the forging ratio of described pulling process is 2.1;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and also carry out jumping-up, the forging ratio of described upsetting process is 1.4;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 2h and punching, reaming;
5) workpiece that generates in the step 4) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.3.
3. property heat treatment:
When the billet surface temperature is not higher than 500 ℃ after forging, base substrate is heated to 1050 ℃ temperature range and is incubated 3h, water-cooled is not come out of the stove to not being higher than 100 ℃ afterwards.
Key points for operation:
1. after workpiece is come out of the stove, workpiece handling to the cooling medium time is no more than 55 seconds.
2. when workpiece is gone into water cooling, ON cycle water, the water yield is opened greatly as far as possible; Water temperature≤50 ℃.
3. workpiece is immersed tank, immersion depth 〉=1.5M also moves up and down.
4. machined after the heat treatment: base substrate carries out machined to make described discharge connection safe end.
For the removal of defect area, under the requirement that does not influence the forging mechanical property, allow to forbid on forging, to carry out any repair welding with polishing method removal of defects.
Embodiment 8: present embodiment is entrance sleeve safe end manufacturing process when forging separately:
1. material is selected:
Select 22 " square ingot, 2930Kg/ props up, these are 22 years old " chemical composition of square ingot should meet following regulation:
Trace≤C≤0.35%, trace≤Si≤0.80%, trace≤Mn≤2.00%, trace≤P≤0.020%, trace≤S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%, trace≤N≤0.080%, trace≤B≤0.0010%, trace≤Cu≤0.50%, trace≤Co≤0.10%, trace≤Nb+Ta≤0.15%, surplus is Fe and unavoidable impurities.
2. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3.5h afterwards and make its temperature reach 1180 ℃, insulation 2.5h, and in this process, carry out jumping-up, the forging ratio of described upsetting process is 1.3;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also pulls out, and the forging ratio of described pulling process is 2.1;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and also carry out jumping-up, the forging ratio of described upsetting process is 1.4;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 2h and punching, reaming;
5) workpiece that generates in the step 4) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.3.
3. property heat treatment:
When the billet surface temperature is not higher than 500 ℃ after forging, base substrate is heated to 1060 ℃ temperature range and is incubated 6h, water-cooled is not come out of the stove to not being higher than 100 ℃ afterwards.
Key points for operation:
1. after workpiece is come out of the stove, workpiece handling to the cooling medium time is no more than 55 seconds.
2. when workpiece is gone into water cooling, ON cycle water, the water yield is opened greatly as far as possible; Water temperature≤50 ℃.
3. workpiece is immersed tank, immersion depth 〉=1.5M also moves up and down.
4. machined after the heat treatment: base substrate carries out machined to make described discharge connection safe end.
For the removal of defect area, under the requirement that does not influence the forging mechanical property, allow to forbid on forging, to carry out any repair welding with polishing method removal of defects.
Embodiment 9: present embodiment is entrance sleeve safe end manufacturing process when forging separately:
1. material is selected:
Select 22 " square ingot, 2930Kg/ props up, these are 22 years old " chemical composition of square ingot should meet following regulation:
Trace≤C≤0.35%, trace≤Si≤0.80%, trace≤Mn≤2.00%, trace≤P≤0.020%, trace≤S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%, trace≤N≤0.080%, trace≤B≤0.0010%, trace≤Cu≤0.50%, trace≤Co≤0.10%, trace≤Nb+Ta≤0.15%, surplus is Fe and unavoidable impurities.
2. forge:
The head of ingot, ingot tail excision percentage: butt ingot 17%, back-end crop 8%.
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3.5h afterwards and make its temperature reach 1180 ℃, insulation 2.5h, and in this process, carry out jumping-up, the forging ratio of described upsetting process is 1.3;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also pulls out, and the forging ratio of described pulling process is 2.1;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and also carry out jumping-up, the forging ratio of described upsetting process is 1.4;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 2h and punching, reaming;
5) workpiece that generates in the step 4) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.3.
3. property heat treatment:
When the billet surface temperature is not higher than 500 ℃ after forging, base substrate is heated to 1055 ℃ temperature range and is incubated 4.5h, water-cooled is not come out of the stove to not being higher than 100 ℃ afterwards.
Key points for operation:
1. after workpiece is come out of the stove, workpiece handling to the cooling medium time is no more than 55 seconds.
2. when workpiece is gone into water cooling, ON cycle water, the water yield is opened greatly as far as possible; Water temperature≤50 ℃.
3. workpiece is immersed tank, immersion depth 〉=1.5M also moves up and down.
4. machined after the heat treatment: base substrate carries out machined to make described discharge connection safe end.
For the removal of defect area, under the requirement that does not influence the forging mechanical property, allow to forbid on forging, to carry out any repair welding with polishing method removal of defects.
After adopting technical scheme among above-mentioned 9 embodiment to complete, test to obtain data shown in the following table for forging:
Metal lographic examination
Grain size
The evaluation of forging material grains degree is carried out according to the regulation of ASTM E112, and the prior austenite grain size of forging is narrower than 5 grades.
Non-metallic inclusion
Press the non-metallic inclusion rank of ASTM E45 standard test forging, evaluation result satisfies following regulation:
Category-A (sulfide-based)≤1.5 grade;
Category-B (alumina type)≤1.5 grade;
C class (silicates)≤1.5 grade;
D class (spherical oxide class)≤1.5 grades.
Claims (10)
1. the forging method of a forge piece for safe end of reactor pressure vessel, described forging include discharge connection safe end, discharge connection safe end welding witness spare and entrance sleeve safe end, it is characterized in that having following steps:
A) selection has the steel ingot of following percentage by weight: trace≤C≤0.35%, trace≤Si≤0.80%, trace≤Mn≤2.00%, trace≤P≤0.020%, trace≤S≤0.015%, 11.50%≤Ni≤12.50%, 17.00≤Gr≤18.20%, 2.25%≤Mo≤2.75%, trace≤N≤0.080%, trace≤B≤0.0010%, trace≤Cu≤0.50%, trace≤Co≤0.10%, trace≤Nb+Ta≤0.15%, surplus is Fe and unavoidable impurities;
B) in 900 ℃-1180 ℃ temperature range, with the jumping-up-pulling repeatedly of selected steel ingot in the step a), round as a ball afterwards, punching, reaming, saddle support reaming, revise size and make forging ratio be not less than 4, be used for the base substrate of described forging with forging;
When the described billet surface temperature that c) generates in step b) is not higher than 500 ℃, described base substrate is heated to 1050 ℃-1060 ℃ temperature range and is incubated 3-6h, water-cooled is not come out of the stove to not being higher than 100 ℃ afterwards;
D) base substrate that generates in the step c) is carried out machined to make described forging.
2. the forging method of a kind of forge piece for safe end of reactor pressure vessel according to claim 1, it is characterized in that: when described discharge connection safe end forged separately, the concrete steps of step b) were in its manufacture process:
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 4h; Heat 3h afterwards and make its temperature reach 1180 ℃, insulation 2h, and in this process, pull out-jumping-up, the forging ratio of described upsetting process is 1.5, the forging ratio of described pulling process is 2.2;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also carries out jumping-up, round as a ball, and the forging ratio of described upsetting process is 1.7;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and punching, reaming;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.4.
3. the forging method of a kind of forge piece for safe end of reactor pressure vessel according to claim 1, it is characterized in that: when described discharge connection safe end, discharge connection safe end welding witness spare forged as one, the concrete steps of step b) were in its manufacture process:
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3h afterwards and make its temperature reach 1180 ℃, insulation 2h, and in this process, carry out jumping-up, the forging ratio of described upsetting process is 1.5;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also pulls out, and the forging ratio of described pulling process is 2.1;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and also carry out jumping-up, the forging ratio of described upsetting process is 1.5;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 2h and punching, reaming;
5) workpiece that generates in the step 4) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.4.
4. the forging method of a kind of forge piece for safe end of reactor pressure vessel according to claim 1 is characterized in that: when described entrance sleeve safe end forged, the concrete steps of step b) were in its manufacture process:
1) described steel ingot is heated to 450 ℃, insulation 2h; Heat 3h afterwards and make its temperature reach 800 ℃, insulation 5h; Heat 3.5h afterwards and make its temperature reach 1180 ℃, insulation 2.5h, and in this process, carry out jumping-up, the forging ratio of described upsetting process is 1.3;
2) workpiece that generates in the step 1) is heated to 1180 ℃, insulation 2h also pulls out, and the forging ratio of described pulling process is 2.1;
3) with step 2) in the workpiece that generates be heated to 1180 ℃, be incubated 2h and also carry out jumping-up, the forging ratio of described upsetting process is 1.4;
4) workpiece that generates in the step 3) is heated to 1180 ℃, insulation 2h and punching, reaming;
5) workpiece that generates in the step 4) is heated to 1180 ℃, insulation 1.5h and saddle support reaming, correction size, the forging ratio of described saddle support reaming, correction dimension process is 1.3.
5. the forging method of a kind of forge piece for safe end of reactor pressure vessel according to claim 1, it is characterized in that: when described discharge connection safe end forged separately, the temperature retention time of step c) was 3h in its manufacture process.
6. a kind of forging method of forge piece for safe end of reactor pressure vessel according to claim 1 or 5 is characterized in that in the step c): after described base substrate is come out of the stove, be transported to the cooling medium time to be no more than 55s; The concrete grammar of described water-cooled is that described base substrate is immersed in the tank, and immersion depth is no less than 1.5m and moves up and down, described tank ON cycle water, and water temperature is not higher than 50 ℃ in it.
7. the forging method of a kind of forge piece for safe end of reactor pressure vessel according to claim 1, it is characterized in that the obtained forging of described method at room temperature, its hot strength is 588-601Mpa, and its yield strength of 0.2 is not less than 288Mpa, and its contraction percentage of area Ψ is not less than 56%.
8. discharge connection safe end, it is characterized in that described discharge connection safe end is to be made according to any one described method in the claim 1,2,3 or 6, it is used for reactor pressure vessel, described discharge connection safe end is a hollow circular ring, and its internal diameter is that 697mm, external diameter are that 950mm, width are 142mm.
9. a discharge connection safe end welds witness spare, it is characterized in that described discharge connection safe end welding witness spare is to be made according to any one described method in the claim 1,3 or 6, it is used for reactor pressure vessel, described discharge connection safe end welding witness spare is a hollow circular ring, and its internal diameter is that 697mm, external diameter are that 950mm, width are 250mm.
10. entrance sleeve safe end, it is characterized in that described entrance sleeve safe end is to be made according to any one described method in the claim 1,4 or 6, it is used for reactor pressure vessel, described entrance sleeve safe end is a hollow circular ring, and its internal diameter is that 659mm, external diameter are that 910mm, width are 142mm.
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