CN103817277A - Method for manufacturing 13MnNiMo5-4 drum forged piece for boiler drum - Google Patents
Method for manufacturing 13MnNiMo5-4 drum forged piece for boiler drum Download PDFInfo
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- CN103817277A CN103817277A CN201210470099.2A CN201210470099A CN103817277A CN 103817277 A CN103817277 A CN 103817277A CN 201210470099 A CN201210470099 A CN 201210470099A CN 103817277 A CN103817277 A CN 103817277A
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- drum
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Abstract
The invention discloses a method for manufacturing a 13MnNiMo5-4 drum forged piece for a boiler drum, wherein the 13MnNiMo5-4 drum forged piece is not less than 2000mm in outer diameter, not less than 1500mm in inner diameter and not less than 2500mm in length. The method includes the steps: firstly, blank forging; secondly, heat treatment after forging; thirdly, property heat treatment. The 13MnNiMo5-4 drum forged piece is made by integrally forging a steel ingot which is made by vacuum smelting, and then subjected to an air-cooling quenching heating process. Compared with a conventional drum made of a steel plate by means of roll welding, the drum forged piece for the boiler drum has the advantages that the mechanical property is superior to similar steel plate rolled products and has no evident anisotropy, a longitudinal welding joint is reduced, and safety margin of whole equipment can be improved.
Description
Technical field
The present invention relates to a kind of manufacture method of boiler-steam dome, be specifically related to the manufacture method of a kind of boiler-steam dome 13MnNiMo5-4 cylinder forgings.
Background technology
Boiler-steam dome (also claiming drum) is most important pressure parts in natural circulation boiler, is common in 300MW and following thermoelectricity generating set.Boiler-steam dome generally adopts 13MnNiMo5-4 steel plate to roll and is welded, and the performance requirement of 13MnNiMo5-4 steel plate is as follows:
The shortcoming of 13MnNiMo5-4 steel plate is as follows:
1,13MnNiMo5-4 steel plate anisotropy after rolling is obvious, and longitudinally performance is significantly better than lateral performance;
There is longitudinal weld seam in the drum that 2, roll of steel plate is welded, says disadvantageous from the security standpoint of whole equipment.
Still do not adopt at present 13MnNiMo5-4 forging to manufacture the precedent of boiler-steam dome cylindrical shell.
Summary of the invention
Technical problem to be solved by this invention is to provide the manufacture method of a kind of boiler-steam dome 13MnNiMo5-4 cylinder forgings, and it can obtain the boiler-steam dome cylinder forgings that mechanical property is better.
For solving the problems of the technologies described above, boiler-steam dome of the present invention by the technical solution of the manufacture method of 13MnNiMo5-4 cylinder forgings is:
Be not less than 2000mm for the manufacture of external diameter, internal diameter is not less than 1500mm, and length is not less than the boiler-steam dome 13MnNiMo5-4 cylinder forgings of 2500mm; Comprise the following steps:
The first step, forges base;
By 13MnNiMo5-4 Heating Steel Ingots to 1200～1250 ℃, be forged into external diameter and be not less than 2000mm, internal diameter is not less than 1500mm, and length is not less than the cylinder forgings of 2500mm;
Described 13MnNiMo5-4 steel ingot is for to form by vacuum metling, vacuum pouring.
Second step, forges after-baking;
Forging is put into stove and be heated to 600～700 ℃ of insulations 4～5 hours; Then with the programming rate of≤100 ℃/h, forging is heated to 900～960 ℃ and carries out austenitizing insulation; The time of austenitizing insulation is every 100mm wall thickness insulation 1～1.5 hour.
Afterwards by forging air cooling to≤250 ℃, then forging is entered to stove be heated to 640～680 ℃ and carry out high tempering;
The 3rd step, property heat treatment;
Forging is heated to 600～700 ℃ of insulations 4～5 hours; Be heated to again 880～940 ℃ of hardening heats, carry out coming out of the stove after quenching and preserving heat; The time of quenching and preserving heat is every 100mm wall thickness insulation 1～1.5 hour.
Afterwards forging is sprayed to wind Cooling Quenching by air blast, until the surface temperature of forging be cooled to≤150 ℃; Again forging is entered to stove and be heated to 630～670 ℃ of temperatures, carry out taking out after tempering insulation; The time of tempering insulation is every 100mm wall thickness insulation 2～3 hours.
The technique effect that the present invention can reach is:
The present invention adopts the solid forging of vacuum metling steel ingot to form, then impose and carry out dry quenching Technology for Heating Processing, compared with the boiler-steam dome obtaining welds cylindrical shell with cylinder forgings with conventional roll of steel plate, mechanical property is better than similar steel plate and rolls product, without obvious anisotropy, and lack a longitudinal weld seam, can improve the margin of safety of whole equipment.
Below in conjunction with the specific embodiment, the present invention is further detailed explanation:
The specific embodiment
The manufacture method of 13MnNiMo5-4 cylinder forgings for boiler-steam dome of the present invention, is not less than 2000mm for the manufacture of external diameter, and internal diameter is not less than 1500mm, and length is not less than the boiler-steam dome 13MnNiMo5-4 cylinder forgings of 2500mm; Comprise the following steps:
The first step, forges base;
By 13MnNiMo5-4 Heating Steel Ingots to 1200～1250 ℃ of vacuum metling, vacuum pouring, by solid forging, be forged into external diameter and be not less than 2000mm, internal diameter is not less than 1500mm, and length is not less than the cylinder forgings of 2500mm;
Second step, forges after-baking;
Forging is put into stove and be heated to 600～700 ℃ of insulations 4～5 hours; Then with the programming rate of≤100 ℃/h, forging is heated to 900～960 ℃ and carries out austenitizing insulation; The time of austenitizing insulation is every 100mm wall thickness insulation 1～1.5 hour;
Afterwards by forging air cooling to≤250 ℃, then forging is entered to stove be heated to 640～680 ℃ and carry out high tempering; The object of high tempering operation is to eliminate the internal stress of blank, makes it hardness and is no more than HB180, so that be machined to required size;
The 3rd step, property heat treatment;
Forging is heated to 600～700 ℃ of insulations 4～5 hours; Be heated to again 880～940 ℃ of hardening heats, carry out coming out of the stove after quenching and preserving heat; The time of quenching and preserving heat is every 100mm wall thickness insulation 1～1.5 hour;
Afterwards forging is sprayed to wind Cooling Quenching by air blast, until the surface temperature of forging be cooled to≤150 ℃; Again forging is entered to stove and be heated to 630～670 ℃ of temperatures, carry out taking out after tempering insulation; The time of tempering insulation is every 100mm wall thickness insulation 2～3 hours.
After above-mentioned heat treatment, the performance parameter of 13MnNiMo5-4 cylinder forgings is as shown in table 1:
Table 1
Maximum norm mimicry in table 1 refers to that sample tests after the simulation post weld heat treatment of air cooling after 18 hours through 580 ℃ of insulations;
Minimum modulus mimicry refers to that sample tests after the simulation post weld heat treatment of air cooling after 6 hours through 580 ℃ of insulations.
With the performance indications contrast of 13MnNiMo5-4 steel plate, the performance of 13MnNiMo5-4 drum forging is more excellent, and there is no obvious anisotropy.
Claims (5)
1. a manufacture method for 13MnNiMo5-4 cylinder forgings for boiler-steam dome, is characterized in that, be not less than 2000mm for the manufacture of external diameter, internal diameter is not less than 1500mm, and length is not less than the boiler-steam dome 13MnNiMo5-4 cylinder forgings of 2500mm; Comprise the following steps:
The first step, forges base;
By 13MnNiMo5-4 Heating Steel Ingots to 1200～1250 ℃, be forged into external diameter and be not less than 2000mm, internal diameter is not less than 1500mm, and length is not less than the cylinder forgings of 2500mm;
Second step, forges after-baking;
Forging is put into stove and be heated to 600～700 ℃ of insulations 4～5 hours; Then with the programming rate of≤100 ℃/h, forging is heated to 900～960 ℃ and carries out austenitizing insulation;
Afterwards by forging air cooling to≤250 ℃, then forging is entered to stove be heated to 640～680 ℃ and carry out high tempering;
The 3rd step, property heat treatment;
Forging is heated to 600～700 ℃ of insulations 4～5 hours; Be heated to again 880～940 ℃ of hardening heats, carry out coming out of the stove after quenching and preserving heat;
Afterwards forging is sprayed to wind Cooling Quenching by air blast, until the surface temperature of forging be cooled to≤150 ℃; Again forging is entered to stove and be heated to 630～670 ℃ of temperatures, carry out taking out after tempering insulation.
2. the manufacture method of 13MnNiMo5-4 cylinder forgings for boiler-steam dome according to claim 1, is characterized in that, the 13MnNiMo5-4 steel ingot of the described first step is for to form by vacuum metling, vacuum pouring.
3. the manufacture method of 13MnNiMo5-4 cylinder forgings for boiler-steam dome according to claim 1, is characterized in that, in described second step, the time of austenitizing insulation is every 100mm wall thickness insulation 1～1.5 hour.
4. the manufacture method of 13MnNiMo5-4 cylinder forgings for boiler-steam dome according to claim 1, is characterized in that, in described the 3rd step, the time of quenching and preserving heat is every 100mm wall thickness insulation 1～1.5 hour.
5. the manufacture method with 13MnNiMo5-4 cylinder forgings according to the boiler-steam dome described in claim 1 or 4, is characterized in that, in described the 3rd step, the time of tempering insulation is every 100mm wall thickness insulation 2～3 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210470099.2A CN103817277B (en) | 2012-11-19 | 2012-11-19 | The boiler-steam dome manufacture method of 13MnNiMo5-4 cylinder forgings |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210470099.2A CN103817277B (en) | 2012-11-19 | 2012-11-19 | The boiler-steam dome manufacture method of 13MnNiMo5-4 cylinder forgings |
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| CN103817277A true CN103817277A (en) | 2014-05-28 |
| CN103817277B CN103817277B (en) | 2015-08-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105714062A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Production method of high strength extra-thick boiler steam drum steel plate |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5487795A (en) * | 1993-07-02 | 1996-01-30 | Dong Won Metal Ind. Co., Ltd. | Method for heat treating an impact beam of automotive vehicle door and a system of the same |
| CN101403032A (en) * | 2008-11-12 | 2009-04-08 | 中国科学院金属研究所 | Thermal treatment process for quick cutting steel composite roll |
| CN101638716A (en) * | 2009-08-18 | 2010-02-03 | 杭州宝鼎铸锻有限公司 | Special process for freely forging ASTMA514 (GradeQ) steel ingot into platy forged piece |
| CN101654734A (en) * | 2008-08-20 | 2010-02-24 | 鞍钢重型机械有限责任公司 | Method for manufacturing alloy nodular cast iron roll of universal mill |
| CN101906523A (en) * | 2009-06-02 | 2010-12-08 | 上海重型机器厂有限公司 | Heat treatment process of nuclear power reactor pressure vessel reactor core cylinder forgings |
| CN102560024A (en) * | 2010-12-10 | 2012-07-11 | 上海重型机器厂有限公司 | Heat treatment method of martensite stainless steel forge piece for nuclear power reactor internals pressure spring |
-
2012
- 2012-11-19 CN CN201210470099.2A patent/CN103817277B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5487795A (en) * | 1993-07-02 | 1996-01-30 | Dong Won Metal Ind. Co., Ltd. | Method for heat treating an impact beam of automotive vehicle door and a system of the same |
| CN101654734A (en) * | 2008-08-20 | 2010-02-24 | 鞍钢重型机械有限责任公司 | Method for manufacturing alloy nodular cast iron roll of universal mill |
| CN101403032A (en) * | 2008-11-12 | 2009-04-08 | 中国科学院金属研究所 | Thermal treatment process for quick cutting steel composite roll |
| CN101906523A (en) * | 2009-06-02 | 2010-12-08 | 上海重型机器厂有限公司 | Heat treatment process of nuclear power reactor pressure vessel reactor core cylinder forgings |
| CN101638716A (en) * | 2009-08-18 | 2010-02-03 | 杭州宝鼎铸锻有限公司 | Special process for freely forging ASTMA514 (GradeQ) steel ingot into platy forged piece |
| CN102560024A (en) * | 2010-12-10 | 2012-07-11 | 上海重型机器厂有限公司 | Heat treatment method of martensite stainless steel forge piece for nuclear power reactor internals pressure spring |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105714062A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Production method of high strength extra-thick boiler steam drum steel plate |
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Effective date of registration: 20161220 Address after: 200245 Jiangchuan Road, Shanghai, No. 207, building 1800, No. Patentee after: Shanghai Electric Heavy Forging Co. Ltd. Patentee after: Shanghai Heavy-Machine Factory Co., Ltd. Address before: 200245 Jiangchuan Road, Shanghai, No. 1800, No. Patentee before: Shanghai Heavy-Machine Factory Co., Ltd. |
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