CN102825207B - A kind of stainless steel main nuclear power pipeline Forging Technology - Google Patents
A kind of stainless steel main nuclear power pipeline Forging Technology Download PDFInfo
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- CN102825207B CN102825207B CN201110158358.3A CN201110158358A CN102825207B CN 102825207 B CN102825207 B CN 102825207B CN 201110158358 A CN201110158358 A CN 201110158358A CN 102825207 B CN102825207 B CN 102825207B
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Abstract
The present invention relates to a kind of stainless steel main nuclear power pipeline Forging Technology, it is characterized in that, adopt 316LN ESR ingot blank, forge timely effects on surface crackle in process carry out heat cleaning, and ensure that forging ratio is greater than 4, its component comprises hot arc L001A, hot arc L001B, cold section of A, cold section of B, cold section of C, cold section of D, Surge line piping I, Surge line piping II, Surge line piping III, Surge line piping IV, Surge line piping V 11 sections altogether, the Forging Technology of above-mentioned component is grouped into hot arc L001A, hot arc L001B, cold section of group, Surge line piping IIIV group, Surge line piping IIIIV group.Compared with prior art, the invention has the beneficial effects as follows: the production fire 1) decreasing forging greatly, improves production efficiency, ensure that the design size requirement of forging.2) by heat cleaning in time in forging process, overcome the hot cracking tendency of blank surface, improve the surface quality of main pipeline.3) realize nuclear power key equipment 100% to domesticize.
Description
Technical field
The present invention relates to technical field of forging, particularly relate to a kind of stainless steel main nuclear power pipeline Forging Technology.
Background technology
The core of " the non-active compressed water reactor nuclear power technology " that be widely used at present with the nuclear fuel that uranium is made, fission occurs in the equipment of " reactor " and produces a large amount of heat energy, with the water be under high pressure, heat energy is taken out of again, steam is produced in steam generator, Steam Actuation steam turbine rotates together with generator, electricity just generates continuously, and is delivered to from all directions by electrical network.Nuclear power plant main pipeline is the large heavy wall bearing pipe of coupled reaction core pressure vessel and steam generator, and being that nuclear steam supply system exports reactor core heat energy " main artery ", is one of core one-level key equipment of pressurized-water reactor nuclear power plant.
Nuclear power plant main pipeline adopts Ultra-low carbon control nitrogen stainless steel 316LN material, and processing and manufacturing difficulty is large, and its forging difficult point mainly contains:
1) during forge hot there is surperficial hot cracking tendency in blank surface.
2) 316LN is austenitic stainless steel, can not adopt heat treatment mode crystal grain thinning after forging, can only carry out crystal grain thinning by forging deformation.
3) forging is complex-shaped, especially hot arc L001A, two ozzle space 45° angles, and forging difficulty is large, is not easy to meet design size requirement.
Summary of the invention
The object of this invention is to provide a kind of stainless steel main nuclear power pipeline Forging Technology, solve the deficiencies in the prior art, reduce face crack, refinement ozzle position grain size, meets design size requirement.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of stainless steel main nuclear power pipeline Forging Technology, it is characterized in that, adopt 316LN ESR ingot blank, its harmful components S≤0.005% is controlled during smelting, P≤0.025%, forge timely effects on surface crackle in process and carry out heat cleaning, ensure that forging ratio is greater than 4, its component comprises hot arc L001A, hot arc L001B, cold section of A, cold section of B, cold section of C, cold section of D, Surge line piping I, Surge line piping II, Surge line piping III, Surge line piping IV, Surge line piping 11 sections altogether, different and mechanical property requirements is different by structure, the Forging Technology of above-mentioned component is grouped into hot arc L001A; Hot arc L001B; Cold section of group; Surge line piping I, Surge line piping II and Surge line piping V is one group; Surge line piping III and Surge line piping IV are one group, and wherein the operating procedure of hot arc L001A is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size is mated with hydraulic press upset die;
3) pull out in advance, each drafts 40-60mm, when pulling out not in place, return stove insulation 2-6 hour;
4) secondary jumping-up pulling repeatedly, when jumping-up is not in place, return stove insulation 16-24 hour, when pulling out not in place, return stove insulation 2-6 hour, each drafts 50-150mm, due to main pipeline two ozzle in space angle at 45 °, for ease of carrying out calibration to two ozzles, finally blank is pulled into the prism of cross section octagon;
5) print is drawn in corresponding ozzle position, and segmentation pulls out, as not in place in pulled out, and returns stove insulation 2-6 hour, and when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, guarantee width and depth ratio are greater than 6:1;
6) pulling finishing, ensures that total forging ratio is greater than 4, pulls out not in place, and return stove insulation 2-6 hour, local forges ozzle crystal grain thinning;
7) after forging finished product, be positioned over ventilation, accelerate to be cooled to room temperature.
The operating procedure of described hot arc L001B is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size is mated with hydraulic press upset die;
3) pull out in advance, each drafts 40-60mm, when pulling out not in place, return stove insulation 2-6 hour;
4) three jumping-up pullings repeatedly, when jumping-up is not in place, return stove insulation 16-24 hour, when pulling out not in place, return stove insulation 2-6 hour, each drafts 50-150mm, require size, then increase a jumping-up as pulling for the last time can not pull out;
5) print is drawn in corresponding ozzle position, and segmentation pulls out, as not in place in pulled out, and returns stove insulation 2-6 hour, and when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, guarantee width and depth ratio are greater than 6:1;
6) pulling finishing, ensures that total forging ratio is greater than 4, pulls out not in place, and return stove insulation 2-6 hour, local forges ozzle crystal grain thinning;
7) after forging finished product, be positioned over ventilation, accelerate to be cooled to room temperature.
The operating procedure of described cold section of group is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size is mated with hydraulic press upset die;
3) pull out in advance, each drafts 40-60mm, when pulling out not in place, return stove insulation 2-4 hour;
4) secondary jumping-up pulling repeatedly, when jumping-up is not in place, returns stove insulation 10-15 hour, and when pulling out not in place, return stove insulation 2-4 hour, each drafts 50-150mm, first pulls into cylindrical, then pulls into the prism of cross section octagon;
5) draw print segmentation, segmentation pulls out, as not in place in pulled out, and returns stove insulation 2-6 hour, and when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, guarantee width and depth ratio are greater than 6:1;
6) pulling finishing, ensures that total forging ratio is greater than 4, pulls out not in place, returns stove insulation 2-6 hour;
7) be positioned over ventilation after finished product, accelerate to be cooled to room temperature.
The operating procedure of described Surge line piping I, Surge line piping II, Surge line piping V group is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size is mated with hydraulic press upset die;
3) pull out blanking, each drafts 40-60mm, when pulling out not in place, return stove insulation 2-4 hour;
4) segmentation pulling, pulls out not in place, returns stove insulation 1-2 hour, and when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, guarantee width and depth ratio are greater than 6:1;
5) finishing, is positioned over ventilation after finished product, accelerates to be cooled to room temperature.
The operating procedure of described Surge line piping III, Surge line piping IV group is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size is mated with hydraulic press upset die;
3) pull out in advance, each drafts 40-60mm, when pulling out not in place, return stove insulation 2-4 hour;
4) jumping-up pulling, when jumping-up is not in place, returns stove insulation 16-20 hour, when pulling out not in place, returns stove insulation 2-4 hour, each drafts 50-150mm;
5) pull out blanking, each drafts 40-60mm, when pulling out not in place, return stove insulation 2-4 hour;
6) segmentation pulling, pulls out not in place, returns stove insulation 1-2 hour, and when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, guarantee width and depth ratio are greater than 6:1;
7) finishing, is positioned over ventilation after finished product, accelerates to be cooled to room temperature.
Compared with prior art, the invention has the beneficial effects as follows:
1) decrease the production fire of forging greatly, namely saved the energy, improve production efficiency, in turn ensure that the design size requirement of forging.
2) by heat cleaning in time in forging process, overcome the hot cracking tendency of blank surface, improve the surface quality of main pipeline.
3) serve great effect to realizing nuclear power key equipment 100% production domesticization, its Social benefit and economic benefit is inestimable.
Accompanying drawing explanation
Fig. 1 is main nuclear power pipeline hot arc L001A forging ' s block dimension figure;
Fig. 2 is that hot arc L001A is drawn into eight arris post state diagrams;
Fig. 3 is that hot arc L001A presses shoulder to separate the state diagram of C section;
Fig. 4 is hot arc L001A segmentation pulling finishing state diagram;
Fig. 5 is main nuclear power pipeline hot arc L001B forging ' s block dimension figure;
Fig. 6 is that print state diagram is drawn in hot arc L001B segmentation;
Fig. 7 is main nuclear power pipeline cold section of A, cold section of B forging ' s block dimension figure;
Fig. 8 is cold section of A, print state diagram is drawn in cold section of B segmentation;
Fig. 9 is main nuclear power pipeline cold section of C, cold section of D forging ' s block dimension figure;
Figure 10 is cold section of C, print state diagram is drawn in cold section of D segmentation;
Figure 11 is main nuclear power pipeline Surge line piping I, Surge line piping II, Surge line piping V forging ' s block dimension figure;
Figure 12 is main nuclear power pipeline Surge line piping III, Surge line piping IV forging ' s block dimension figure.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
The present invention is a kind of stainless steel main nuclear power pipeline Forging Technology, it adopts 316LN ESR ingot blank, its harmful components S≤0.005% is controlled during smelting, P≤0.025%, forge timely effects on surface crackle in process carry out heat cleaning, improve forging surface quality, its component comprises hot arc L001A altogether, hot arc L001B, cold section of A, cold section of B, cold section of C, cold section of D, Surge line piping I, Surge line piping II, Surge line piping III, Surge line piping IV, Surge line piping V its 11 sections, different and mechanical property requirements is different by structure, the Forging Technology of above-mentioned component is grouped into hot arc L001A, hot arc L001B, cold section of group, Surge line piping I, II, V group, Surge line piping III, IV group.
See Fig. 1, Fig. 2, Fig. 3, Fig. 4, the operating procedure showing wherein hot arc L001A is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, be incubated 6 hours, then 630-670 DEG C is heated to the heating rate being not more than 30 DEG C/h, be incubated 14 hours, and then be heated to 1190-1210 DEG C with the heating rate being not more than 40 DEG C/h, be incubated 30 hours, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size φ 930mm × 1300mm mates with hydraulic press upset die;
3) pull out to φ 1600mm × 3960mm in advance, each drafts 50mm, when pulling out not in place, return stove and be incubated 3 hours;
4) repeatedly secondary jumping-up pulling, jumping-up to φ 2050mm × 2500mm, when jumping-up is not in place, return stove and be incubated 16 hours, pull out to φ 1600mm × 3960mm, when pulling out not in place, return stove and be incubated 4 hours, each drafts 50-150mm, due to main pipeline two ozzle in space angle at 45 °, for ease of carrying out calibration to two ozzles, finally blank is pulled into the prism of cross section octagon, prism size opposite side distance 1430mm, long 4690mm, first pull out the side of pulling out after justifying;
5) print is drawn in corresponding ozzle position, pressure shoulder separates C section, A+B section, D+E+ rear, C section pressure shoulder dark 160mm, the wide 780mm of wide 1200mm, B section wide 780mm, D section, then A section, C section, E section segmentation pulling are to φ 1060mm, as not in place in pulled out, return stove and be incubated 5 hours, when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, ensure that width and depth ratio are greater than 6:1 during crackle cleaning, not only narrow but also dark pit can not be formed;
6) pulling finishing B section, D section, ensure that total forging ratio is greater than 4, pull out not in place, return stove and be incubated 5 hours, local forges B section, D section ozzle position with crystal grain thinning;
7) after forging finished product, be positioned over ventilation, accelerate to be cooled to room temperature, the possibility of grain growth under minimizing high temperature.
See Fig. 5, Fig. 6, wherein the operating procedure of hot arc L001B is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, be incubated 6 hours, then 630-670 DEG C is heated to the heating rate being not more than 30 DEG C/h, be incubated 14 hours, and then be heated to 1190-1210 DEG C with the heating rate being not more than 40 DEG C/h, be incubated 30 hours, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size φ 930mm × 1250mm mates with hydraulic press upset die;
3) pull out to φ 1600mm × 3960mm in advance, each drafts 50mm, when pulling out not in place, return stove and be incubated 3 hours;
4) three jumping-up pullings repeatedly, jumping-up is to φ 2000mm × 2550mm, when jumping-up is not in place, return stove and be incubated 16 hours, pull out to φ 1600mm, when pulling out not in place, return stove and be incubated 4 hours, each drafts 50-150mm, as pulling can not pull out 1900mm × 1060mm × 4015mm for the last time, then increases a jumping-up;
5) draw print segmentation and go out I section of wide 1645mm, II section of wide 960mm, III section of wide 1300mm, II section of respective tube mouth position, pull out I section and III section respectively to φ 1100mm, ensure that I section and III section are coaxial, as not in place in pulled out, return stove insulation 2-6 hour, when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, ensure that width and depth ratio are greater than 6:1 during crackle cleaning, not only narrow but also dark pit can not be formed;
6) pulling finishing, ensures that total forging ratio is greater than 4, pulls out not in place, and return stove insulation 2-6 hour, local forges ozzle crystal grain thinning;
7) after forging finished product, be positioned over ventilation, accelerate to be cooled to room temperature, the possibility of grain growth under minimizing high temperature.
Described cold section of group comprises cold section of A, cold section of B, cold section of C, cold section of D, and structure is similar each other, sees Fig. 7, Fig. 8, and wherein cold section of A is identical with cold section of B physical dimension, sees Fig. 9, Figure 10, and cold section of C is identical with cold section of D physical dimension, and concrete operation step is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size φ 930mm × 1100mm mates with hydraulic press upset die;
3) pull out to φ 1400mm × 2900mm in advance, each drafts 50mm, when pulling out not in place, return stove insulation 2-4 hour;
4) secondary jumping-up pulling repeatedly, jumping-up is to φ 1750mm, when jumping-up is not in place, return stove insulation 10-15 hour, pull out to φ 1400mm × 2850mm, when pulling out not in place, return stove insulation 2-4 hour, each drafts 50-150mm, first pulls into cylindrical, then pulls into the prism of cross section octagon opposite side distance 1100mm;
5) draw print and blank is divided into I section, II section, III section+tail, segmentation pulls out, as not in place in pulled out, and returns stove insulation 2-6 hour, and when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, guarantee width and depth ratio are greater than 6:1;
6) pulling finishing, ensures that total forging ratio is greater than 4, pulls out not in place, returns stove insulation 2-6 hour;
7) be positioned over ventilation after finished product, accelerate to be cooled to room temperature.
In described Surge line piping I, II, V group, Surge line piping I, Surge line piping II, Surge line piping V are formed by same blank disjunction, see Figure 11, and its concrete operation step is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size φ 930mm × 1100mm mates with hydraulic press upset die;
3) pulling is to φ 650mm × 13800mm, and marking knife blanking is divided into Surge line piping I+Surge line piping V+arc end and two sections, Surge line piping II+receipts arc end, and each drafts 50mm, when pulling out not in place, returns stove insulation 2-4 hour;
4) segmentation pulling is to φ 515 ± 10mm, pulls out not in place, returns stove insulation 1-2 hour, and when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, guarantee width and depth ratio are greater than 6:1;
5) finishing, is positioned over ventilation after finished product, accelerates to be cooled to room temperature.
In described Surge line piping III, IV group, Surge line piping III, Surge line piping IV are formed by same blank disjunction, see Figure 12, and its concrete operation step is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size φ 930mm × 1100mm mates with hydraulic press upset die;
3) pull out to φ 1400mm × 2900mm in advance, each drafts 50mm, when pulling out not in place, return stove insulation 2-4 hour;
4) jumping-up pulling, jumping-up, to φ 1800mm, when jumping-up is not in place, returns stove insulation 16-20 hour, pulls out to φ 750mm × 10070mm, when pulling out not in place, returns stove insulation 2-4 hour, each drafts 50-150mm;
5) marking knife segmentation is cutting into Surge line piping III+arc end and two sections, Surge line piping IV+receipts arc end, segmentation pulling is to respective forging ' s block dimension, pull out not in place, return stove insulation 1-2 hour, when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, ensure that width and depth ratio are greater than 6:1;
7) finishing, is positioned over ventilation after finished product, accelerates to be cooled to room temperature.
Claims (5)
1. a stainless steel main nuclear power pipeline Forging Technology, it is characterized in that, adopt 316LN ESR ingot blank, its harmful components S≤0.005% is controlled during smelting, P≤0.025%, forge timely effects on surface crackle in process and carry out heat cleaning, ensure that forging ratio is greater than 4, its component comprises hot arc L001A, hot arc L001B, cold section of A, cold section of B, cold section of C, cold section of D, Surge line piping I, Surge line piping II, Surge line piping III, Surge line piping IV, Surge line piping 11 sections altogether, different and mechanical property requirements is different by structure, the Forging Technology of above-mentioned component is grouped into hot arc L001A; Hot arc L001B; Cold section of group; Surge line piping I, Surge line piping II and Surge line piping V is one group; Surge line piping III and Surge line piping IV are one group, and wherein the operating procedure of hot arc L001A is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size is mated with hydraulic press upset die;
3) pull out in advance, each drafts 40-60mm, when pulling out not in place, return stove insulation 2-6 hour;
4) secondary jumping-up pulling repeatedly, when jumping-up is not in place, return stove insulation 16-24 hour, when pulling out not in place, return stove insulation 2-6 hour, each drafts 50-150mm, due to main pipeline two ozzle in space angle at 45 °, for ease of carrying out calibration to two ozzles, finally blank is pulled into the prism of cross section octagon;
5) print is drawn in corresponding ozzle position, and segmentation pulls out, as not in place in pulled out, and returns stove insulation 2-6 hour, and when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, guarantee width and depth ratio are greater than 6:1;
6) pulling finishing, ensures that total forging ratio is greater than 4, pulls out not in place, and return stove insulation 2-6 hour, local forges ozzle crystal grain thinning;
7) after forging finished product, be positioned over ventilation, accelerate to be cooled to room temperature.
2. a kind of stainless steel main nuclear power pipeline Forging Technology according to claim 1, it is characterized in that, the operating procedure of described hot arc L001B is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size is mated with hydraulic press upset die;
3) pull out in advance, each drafts 40-60mm, when pulling out not in place, return stove insulation 2-6 hour;
4) three jumping-up pullings repeatedly, when jumping-up is not in place, return stove insulation 16-24 hour, when pulling out not in place, return stove insulation 2-6 hour, each drafts 50-150mm, require size, then increase a jumping-up as pulling for the last time can not pull out;
5) print is drawn in corresponding ozzle position, and segmentation pulls out, as not in place in pulled out, and returns stove insulation 2-6 hour, and when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, guarantee width and depth ratio are greater than 6:1;
6) pulling finishing, ensures that total forging ratio is greater than 4, pulls out not in place, and return stove insulation 2-6 hour, local forges ozzle crystal grain thinning;
7) after forging finished product, be positioned over ventilation, accelerate to be cooled to room temperature.
3. a kind of stainless steel main nuclear power pipeline Forging Technology according to claim 1, is characterized in that, the operating procedure of described cold section of group is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size is mated with hydraulic press upset die;
3) pull out in advance, each drafts 40-60mm, when pulling out not in place, return stove insulation 2-4 hour;
4) secondary jumping-up pulling repeatedly, when jumping-up is not in place, returns stove insulation 10-15 hour, and when pulling out not in place, return stove insulation 2-4 hour, each drafts 50-150mm, first pulls into cylindrical, then pulls into the prism of cross section octagon;
5) draw print segmentation, segmentation pulls out, as not in place in pulled out, and returns stove insulation 2-6 hour, and when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, guarantee width and depth ratio are greater than 6:1;
6) pulling finishing, ensures that total forging ratio is greater than 4, pulls out not in place, returns stove insulation 2-6 hour;
7) be positioned over ventilation after finished product, accelerate to be cooled to room temperature.
4. a kind of stainless steel main nuclear power pipeline Forging Technology according to claim 1, is characterized in that, the operating procedure of described Surge line piping I, Surge line piping II, Surge line piping V group is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size is mated with hydraulic press upset die;
3) pull out blanking, each drafts 40-60mm, when pulling out not in place, return stove insulation 2-4 hour;
4) segmentation pulling, pulls out not in place, returns stove insulation 1-2 hour, and when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, guarantee width and depth ratio are greater than 6:1;
5) finishing, is positioned over ventilation after finished product, accelerates to be cooled to room temperature.
5. a kind of stainless steel main nuclear power pipeline Forging Technology according to claim 1, is characterized in that, the operating procedure of described Surge line piping III, Surge line piping IV group is as follows:
1) blank is heated with heating furnace, first by blank heating to 330-370 DEG C, insulation 5-6 hour, then 620-660 DEG C is heated to the heating rate being not more than 30 DEG C/h, insulation 14-15 hour, and then be heated to 1180-1250 DEG C with the heating rate being not more than 40 DEG C/h, insulation 20-30 hour, can come out of the stove forging, final forging temperature is not less than 950 DEG C;
2) bar hold, jaw size is mated with hydraulic press upset die;
3) pull out in advance, each drafts 40-60mm, when pulling out not in place, return stove insulation 2-4 hour;
4) jumping-up pulling, when jumping-up is not in place, returns stove insulation 16-20 hour, when pulling out not in place, returns stove insulation 2-4 hour, each drafts 50-150mm;
5) pull out blanking, each drafts 40-60mm, when pulling out not in place, return stove insulation 2-4 hour;
6) segmentation pulling, pulls out not in place, returns stove insulation 1-2 hour, and when forging that in process, crackle appears in blank surface, carry out heat cleaning in time, during crackle cleaning, guarantee width and depth ratio are greater than 6:1;
7) finishing, is positioned over ventilation after finished product, accelerates to be cooled to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110158358.3A CN102825207B (en) | 2011-06-13 | 2011-06-13 | A kind of stainless steel main nuclear power pipeline Forging Technology |
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| CN106041427A (en) * | 2016-06-29 | 2016-10-26 | 宝钢特钢有限公司 | Production method of cylindrical forging |
| CN108994230A (en) * | 2018-07-16 | 2018-12-14 | 成都先进金属材料产业技术研究院有限公司 | Method for manufacturing and its forging for 16Mn alloy structure steel forgings |
| CN109187864B (en) * | 2018-09-06 | 2021-02-26 | 苏州热工研究院有限公司 | Method for evaluating manufacturing process of forged main pipeline for nuclear power station |
| CN110125315B (en) * | 2019-05-23 | 2020-06-23 | 二重（德阳）重型装备有限公司 | Forging forming method of main pipe blank with asymmetric pipe nozzle |
| CN110465616B (en) * | 2019-08-15 | 2021-04-16 | 上海电气上重铸锻有限公司 | Forging method for controlling grain size of shaft austenite pipeline with super-large cross section |
| CN111644552B (en) * | 2020-06-16 | 2021-09-14 | 建龙北满特殊钢有限责任公司 | Forging method of multistage step roller with cone frustum |
| CN111889602B (en) * | 2020-07-31 | 2022-01-07 | 河南中原特钢装备制造有限公司 | Upsetting plate for improving electroslag ingot forging roll yield and forging method |
| CN115740314B (en) * | 2022-11-24 | 2023-05-16 | 南京工程学院 | High-strength large forging anti-cracking energy-saving forging process |
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| CN101670416A (en) * | 2008-09-09 | 2010-03-17 | 上海重型机器锻件厂 | Forging molding method for million kilowatt nuclear power main pipe |
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| KR100382997B1 (en) * | 2001-01-19 | 2003-05-09 | 한국전력공사 | Method of Manufacturing A Tube and A Sheet of Niobium-containing Zirconium Alloys for High Burn-up Nuclear Fuel |
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