CN101255490A - After-forging grain-refining strength-toughening treatment process of 1Mn18Cr18N steel guard ring for generating set - Google Patents
After-forging grain-refining strength-toughening treatment process of 1Mn18Cr18N steel guard ring for generating set Download PDFInfo
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- CN101255490A CN101255490A CNA2008100449975A CN200810044997A CN101255490A CN 101255490 A CN101255490 A CN 101255490A CN A2008100449975 A CNA2008100449975 A CN A2008100449975A CN 200810044997 A CN200810044997 A CN 200810044997A CN 101255490 A CN101255490 A CN 101255490A
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Abstract
The invention discloses a fine grains strengthening-toughening process after forging a 1Mn18Cr18N steel shroud ring rolling piece for manufacturing a generating set, comprising the steps of: cold pre-deforming and solution heat treating the rough machined 1Mn18Cr18N steel shroud ring rolling piece, and sampling testing the solution heat treating effect. According to the invention, austenitic steel forging piece which is essentially coarse grains and can not refine grains by heat treatment has fine and uniform grains before cold deformation strengthening, thus to greatly improve the strength, plasticity and toughness of the forging piece, as well as strengthen the quality controllability.
Description
Technical field
The present invention relates to the manufacturing technology of the 18 N steel guard ring forging that turbine driven set or Nuclear power plants use, relate generally to generating set with the forging of 1Mn18Cr18N 18 N steel guard ring forging after thin brilliant strength-toughening treatment process.
Technical background
At present, the forging finishing process method of turbine driven set forging manufacturing retaining ring is mainly both at home and abroad: forge the back air cooling and handle or the water-cooled thermomechanical treatment, solution heat treatment after the roughing directly enters the cold deformation strengthening operation then.Because the forging method of forging is to take the many fire time open die forgings of common ton flat-die forging water pressure engine small deformation, the breach that produces in forging is stopped to forge at any time, adopt the mode of flame or arcgouging to remove after cooling, air cooling or water-cooled thermomechanical treatment again after the forging, but common ton flat-die forging water pressure engine is slow in one's movements because of it, narrow to malleable temperature range, 1Mn18Cr18N steel easy to crack very easily causes forging crack, so may cause every fire time forging ratio deficiency, metal defect to be difficult to forge and close because stop forging the removing breach at any time, distortion is uneven, thick unequal forging internal soundness problem of crystal grain and production efficiency problem; And the forging breach is carried out flame or arcgouging removing and produces overheated burning defective in stress concentration, the heat affected zone, make and after removing breach, continue to ftracture repeatedly in the forging process, aggravated above-mentioned internal soundness problem and production efficiency problem; Carbide is separated out on crystal boundary in a large number when forging the back air cooling, and crystal grain is further grown up, even taking water-cooled thermomechanical treatment technology to solve carbide after forging separates out and the crystal grain problem of further growing up, but because the ton water pressure engine is slow in one's movements and may stop forge to remove breach at any time, therefore can't guarantee certain deformation amount and the certain deformation temperature two big conditions that thermomechanical treatment is necessary, can not stablize the realization thermomechanical treatment, the crystal grain of the thick inequality that forms in the forging process still can not refinement and homogenizing, so follow-up solution treatment must at high temperature be incubated for a long time and cause crystal grain thicker, make that the green strength before the cold deformation strengthening is lower, plasticity and toughness are relatively poor, relatively poor because of plasticity and toughness before strengthening on the one hand, the plasticity and toughness of product remain at low levels after strengthening, lower because of intensity before strengthening on the other hand, the requirement of strength that reaches the product regulation needs bigger cold deformation amount, and along with the increase of cold deformation amount, the plasticity and toughness of product further reduce and can not reach the plasticity and toughness required value of product regulation.
Summary of the invention
The objective of the invention is at above-mentioned the deficiencies in the prior art, a kind of forging aftertreatment technology of making generating set with 1Mn18Cr18N 18 N steel guard ring forging is provided.Adopt the present invention can make essential coarse-grain and can not be tiny and even by austenitic steel forging crystal grain before cold deformation strengthening of thermal treatment crystal grain thinning, thereby improve the intensity and the plasticity and toughness of forging by a relatively large margin, the while quality controllability is strong.
For achieving the above object, the technical solution used in the present invention is as follows:
Thin brilliant strength-toughening treatment process after the forging of generating set usefulness 1Mn18Cr18N 18 N steel guard ring forging, it is characterized in that: comprise that rough machined 18 N steel guard ring forging gives cold deformation and solution heat treatment successively, sampling detects the solution heat treatment effect with having carried out, its concrete steps are:
A, give cold deformation and solution heat treatment: the 18 N steel guard ring forging that ℃ will carry out roughing and solution heat treatment down in room temperature-360 carries out cold deformation in advance by external diameter cold deformation amount 5-15% to be handled, or directly will only carry out rough machined 18 N steel guard ring forging and under room temperature-360 ℃, carry out cold deformation in advance and handle by external diameter cold deformation amount 5-15%, then with forging≤300 ℃ of following shove charges, and directly be warmed up to 1040-1050 ℃ by the heat treatment furnace top speed, carry out solution heat treatment once more by 1 hour/65mm wall thickness, the water-cooled immediately of coming out of the stove at last;
B, sampling detect the solution heat treatment effect: forging sampling carrying out pulling force, impact, grain fineness number and grain boundary carbide that the A step obtains are tested to detect the solution heat treatment effect.
In above-mentioned steps, carrying out the water-cooled thermomechanical treatment below 960 ℃ if take air cooling processing or final forging temperature after forging, then should before giving cold deformation and solution heat treatment step, carry out a solution heat treatment earlier, be about to carry out rough machined 18 N steel guard ring forging≤300 ℃ of following shove charges, and by≤40 ℃/h be warmed up to 640-660 ℃ after the insulation 1.5-2.5 hour, be warming up to 1040-1050 ℃ again, carry out solution heat treatment, the water-cooled immediately of coming out of the stove then by 1 hour/40mm wall thickness;
Coming out of the stove immediately in described A and the B step, water-cooled is meant: forging from the back of coming out of the stove to pitch time≤15 of entry minute, forging air blast seethe and round-robin water in move up and down and be not less than 5 minutes.
Described 18 N steel guard ring forging is meant: adopt electroslag ingot or electroslag blank forging and forge the 1Mn18Cr18N steel loop shape or the cylindrical forged piece of back air cooling processing or water-cooled thermomechanical treatment.
The invention has the advantages that:
Because the 1Mn18Cr18N steel is an essential coarse-grain and can not be by the austenitic steel of thermal treatment crystal grain thinning, so forging just must possess tiny and uniform crystal grain state after requiring forging to finish, but because this material forges characteristic easy to crack, forging the inferior deflection of every fire can not control, thereby take small deformation, the inferior forging method of many fire is finished forging process, but this kind method causes heating repeatedly under the forging high temperature, time distortion of every fire is not enough and be out of shape inhomogeneous, the thick inequality of forging crystal grain, forging intensity is lower, and plasticity and toughness are relatively poor, can not satisfy the required value of product regulation.
Because this MATERIALS ' DYNAMIC recrystallization temperature is higher, and must possesses bigger forging deformation amount dynamic recrystallization and could take place, all can not satisfy above-mentioned condition but forge this material retaining ring usually, so the crystal grain of forging is the forging crystal grain that dynamic recrystallization does not take place.Adopt the present invention when the 1Mn18Cr18N 18 N steel guard ring being carried out the 1st solution heat treatment, can impel the generation recrystallize, crystal grain obtains refinement and homogenizing;
Adopt the present invention the 1Mn18Cr18N 18 N steel guard ring being given cold deformation and once more during solution heat treatment, high-temperature heat treatment has been eliminated and has been given the work hardening that cold deformation produces, impel simultaneously static recrystallize takes place, the further refinement of crystal grain, and owing to give cold deformation is to adopt shaping dies to finish, be out of shape extremely evenly, thereby the uniform crystal particles of the forging behind the static recrystallize also is greatly improved.Because the carbide when first time solution heat treatment on the crystal boundary has dissolved among the crystal grain, so after giving cold deformation once more during solution heat treatment, forging short period insulation at high temperature can reach the purpose of solution treatment, crystal grain behind the static recrystallize after the refinement also under the Yin Gaowen soaking time short and can not grow up once more, the intensity and the plasticity and toughness of forging all are improved, and especially former manufacture method is difficult to qualified relative reduction in area and two indexs of ballistic work have had assurance;
Detection after solution treatment once more can find to exist the inadequate problem of solid solution early and again solution heat treatment solve.
Above-mentioned operation process and process characteristics make 1Mn18Cr18N 18 N steel guard ring forging crystal grain before cold deformation strengthening tiny and even, thereby improve the intensity and the plasticity and toughness of forging by a relatively large margin, and quality controllability is strong simultaneously.
Embodiment
Embodiment 1:
Thin brilliant strength-toughening treatment process after the forging of generating set usefulness 1Mn18Cr18N 18 N steel guard ring forging, comprise that will carry out rough machined 18 N steel guard ring forging carries out solution heat treatment successively, gives cold deformation and solution heat treatment once more, takes a sample and detect the solution heat treatment effect, its concrete steps are:
A, solution heat treatment: will carry out rough machined 18 N steel guard ring forging≤300 ℃ of following shove charges, and by≤40 ℃/h be warmed up to 640-660 ℃ after the insulation 1.5-2.5 hour, be warming up to 1040-1050 ℃ again, carry out solution heat treatment, the water-cooled immediately of coming out of the stove then by 1 hour/40mm wall thickness;
B, give cold deformation and solution heat treatment once more: at room temperature the forging that the A step is obtained carries out cold deformation in advance by external diameter cold deformation amount 5% and handles, then with forging≤300 ℃ of following shove charges, and directly be warmed up to 1040-1050 ℃ by the heat treatment furnace top speed, carry out solution heat treatment once more by 1 hour/65mm wall thickness, the water-cooled immediately of coming out of the stove at last;
C, sampling detect the solution heat treatment effect: forging sampling carrying out pulling force, impact, grain fineness number and grain boundary carbide that the B step obtains are tested to detect the solution heat treatment effect.
Coming out of the stove immediately in described A and the B step, water-cooled is meant: forging is 5 minutes from the back of coming out of the stove to pitch time of entry, forging air blast seethe and round-robin water in moved up and down 5 minutes.
Described 18 N steel guard ring forging is meant: adopt electroslag ingot or electroslag blank forging and forge the 1Mn18Cr18N steel loop shape or the cylindrical forged piece of back air cooling processing or water-cooled thermomechanical treatment.
Embodiment 2:
Thin brilliant strength-toughening treatment process after the forging of generating set usefulness 1Mn18Cr18N 18 N steel guard ring forging, comprise that will carry out rough machined 18 N steel guard ring forging carries out solution heat treatment successively, gives cold deformation and solution heat treatment once more, takes a sample and detect the solution heat treatment effect, its concrete steps are:
A, solution heat treatment: will carry out rough machined 18 N steel guard ring forging≤300 ℃ of following shove charges, and by≤40 ℃/h be warmed up to 640-660 ℃ after the insulation 1.5-2.5 hour, be warming up to 1040-1050 ℃ again, carry out solution heat treatment, the water-cooled immediately of coming out of the stove then by 1 hour/40mm wall thickness;
B, give cold deformation and solution heat treatment once more: the forging that under 360 ℃ the A step is obtained carries out cold deformation in advance by external diameter cold deformation amount 10% to be handled, then with forging≤300 ℃ of following shove charges, and directly be warmed up to 1040-1050 ℃ by the heat treatment furnace top speed, carry out solution heat treatment once more by 1 hour/65mm wall thickness, the water-cooled immediately of coming out of the stove at last;
C, sampling detect the solution heat treatment effect: forging sampling carrying out pulling force, impact, grain fineness number and grain boundary carbide that the B step obtains are tested to detect the solution heat treatment effect.
Coming out of the stove immediately in described A and the B step, water-cooled is meant: forging is 10 minutes from the back of coming out of the stove to pitch time of entry, forging air blast seethe and round-robin water in moved up and down 10 minutes.
Described 18 N steel guard ring forging is meant: adopt electroslag ingot or electroslag blank forging and forge the 1Mn18Cr18N steel loop shape or the cylindrical forged piece of back air cooling processing or water-cooled thermomechanical treatment.
Embodiment 3:
Thin brilliant strength-toughening treatment process after the forging of generating set usefulness 1Mn18Cr18N 18 N steel guard ring forging, comprise that will carry out rough machined 18 N steel guard ring forging carries out solution heat treatment successively, gives cold deformation and solution heat treatment once more, takes a sample and detect the solution heat treatment effect, its concrete steps are:
A, solution heat treatment: will carry out rough machined 18 N steel guard ring forging≤300 ℃ of following shove charges, and by≤40 ℃/h be warmed up to 640-660 ℃ after the insulation 1.5-2.5 hour, be warming up to 1040-1050 ℃ again, carry out solution heat treatment, the water-cooled immediately of coming out of the stove then by 1 hour/40mm wall thickness;
B, give cold deformation and solution heat treatment once more: the forging that under 180 ℃ the A step is obtained carries out cold deformation in advance by external diameter cold deformation amount 15% to be handled, then with forging≤300 ℃ of following shove charges, and directly be warmed up to 1040-1050 ℃ by the heat treatment furnace top speed, carry out solution heat treatment once more by 1 hour/65mm wall thickness, the water-cooled immediately of coming out of the stove at last;
C, sampling detect the solution heat treatment effect: forging sampling carrying out pulling force, impact, grain fineness number and grain boundary carbide that the B step obtains are tested to detect the solution heat treatment effect.
Coming out of the stove immediately in described A and the B step, water-cooled is meant: forging is 15 minutes from the back of coming out of the stove to pitch time of entry, forging air blast seethe and round-robin water in moved up and down 20 minutes.
Described 18 N steel guard ring forging is meant: adopt electroslag ingot or electroslag blank forging and forge the 1Mn18Cr18N steel loop shape or the cylindrical forged piece of back air cooling processing or water-cooled thermomechanical treatment.
Embodiment 4:
Generating set with the forging of 1Mn18Cr18N 18 N steel guard ring forging after thin brilliant strength-toughening treatment process, comprise that rough machined 18 N steel guard ring forging gives cold deformation and solution heat treatment successively, sampling detects the solution heat treatment effect with having carried out, its concrete steps are:
A, give cold deformation and solution heat treatment: under 270 ℃, will carry out rough machined 18 N steel guard ring forging and carry out cold deformation in advance by external diameter cold deformation amount 7% and handle, then with forging≤300 ℃ of following shove charges, and directly be warmed up to 1040-1050 ℃ by the heat treatment furnace top speed, carry out solution heat treatment by 1 hour/65mm wall thickness, the water-cooled immediately of coming out of the stove at last;
B, sampling detect the solution heat treatment effect: forging sampling carrying out pulling force, impact, grain fineness number and grain boundary carbide that the A step obtains are tested to detect the solution heat treatment effect.
Coming out of the stove immediately in the described A step, water-cooled is meant: forging is 7 minutes from the back of coming out of the stove to pitch time of entry, forging air blast seethe and round-robin water in moved up and down 15 minutes.
Described 18 N steel guard ring forging is meant: adopt electroslag ingot or electroslag blank forging and forge the 1Mn18Cr18N steel loop shape or the cylindrical forged piece of back air cooling processing or water-cooled thermomechanical treatment.
Embodiment 5:
Generating set with the forging of 1Mn18Cr18N 18 N steel guard ring forging after thin brilliant strength-toughening treatment process, comprise that rough machined 18 N steel guard ring forging gives cold deformation and solution heat treatment successively, sampling detects the solution heat treatment effect with having carried out, its concrete steps are:
A, give cold deformation and solution heat treatment: under 90 ℃, will carry out rough machined 18 N steel guard ring forging and carry out cold deformation in advance by external diameter cold deformation amount 9% and handle, then with forging≤300 ℃ of following shove charges, and directly be warmed up to 1040-1050 ℃ by the heat treatment furnace top speed, carry out solution heat treatment by 1 hour/65mm wall thickness, the water-cooled immediately of coming out of the stove at last;
B, sampling detect the solution heat treatment effect: forging sampling carrying out pulling force, impact, grain fineness number and grain boundary carbide that the A step obtains are tested to detect the solution heat treatment effect.
Coming out of the stove immediately in the described A step, water-cooled is meant: forging is 9 minutes from the back of coming out of the stove to pitch time of entry, forging air blast seethe and round-robin water in moved up and down 30 minutes.
Described 18 N steel guard ring forging is meant: adopt electroslag ingot or electroslag blank forging and forge the 1Mn18Cr18N steel loop shape or the cylindrical forged piece of back air cooling processing or water-cooled thermomechanical treatment.
Embodiment 6:
Generating set with the forging of 1Mn18Cr18N 18 N steel guard ring forging after thin brilliant strength-toughening treatment process, comprise that rough machined 18 N steel guard ring forging gives cold deformation and solution heat treatment successively, sampling detects the solution heat treatment effect with having carried out, its concrete steps are:
A, give cold deformation and solution heat treatment: at room temperature will carry out rough machined 18 N steel guard ring forging and carry out cold deformation in advance by external diameter cold deformation amount 12% and handle, then with forging≤300 ℃ of following shove charges, and directly be warmed up to 1040-1050 ℃ by the heat treatment furnace top speed, carry out solution heat treatment by 1 hour/65mm wall thickness, the water-cooled immediately of coming out of the stove at last;
B, sampling detect the solution heat treatment effect: forging sampling carrying out pulling force, impact, grain fineness number and grain boundary carbide that the A step obtains are tested to detect the solution heat treatment effect.
Coming out of the stove immediately in the described A step, water-cooled is meant: forging is 12 minutes from the back of coming out of the stove to pitch time of entry, forging air blast seethe and round-robin water in moved up and down 40 minutes.Described 18 N steel guard ring forging is meant: adopt electroslag ingot or electroslag blank forging and forge the 1Mn18Cr18N steel loop shape or the cylindrical forged piece of back air cooling processing or water-cooled thermomechanical treatment.
Claims (5)
1, thin brilliant strength-toughening treatment process after the forging of generating set usefulness 1Mn18Cr18N 18 N steel guard ring forging, it is characterized in that: comprise that rough machined 18 N steel guard ring forging gives cold deformation and solution heat treatment successively, sampling detects the solution heat treatment effect with having carried out, its concrete steps are:
A, give cold deformation and solution heat treatment: the 18 N steel guard ring forging that ℃ will carry out roughing and solution heat treatment down in room temperature-360 carries out cold deformation in advance by external diameter cold deformation amount 5-15% to be handled, or directly will only carry out rough machined 18 N steel guard ring forging and under room temperature-360 ℃, carry out cold deformation in advance and handle by external diameter cold deformation amount 5-15%, then with forging≤300 ℃ of following shove charges, and directly be warmed up to 1040-1050 ℃ by the heat treatment furnace top speed, carry out solution heat treatment once more by 1 hour/65mm wall thickness, the water-cooled immediately of coming out of the stove at last;
B, sampling detect the solution heat treatment effect: forging sampling carrying out pulling force, impact, grain fineness number and grain boundary carbide that the A step obtains are tested to detect the solution heat treatment effect.
2, thin brilliant strength-toughening treatment process after the forging of generating set usefulness 1Mn18Cr18N 18 N steel guard ring forging according to claim 1, it is characterized in that: handle or the 18 N steel guard ring forging of final forging temperature after the roughing of carrying out the water-cooled thermomechanical treatment below 960 ℃ taking air cooling after forging, before giving cold deformation and solution heat treatment, carry out solution heat treatment earlier, be about to carry out rough machined 18 N steel guard ring forging≤300 ℃ of following shove charges, and by≤40 ℃/h be warmed up to 640-660 ℃ after the insulation 1.5-2.5 hour, be warming up to 1040-1050 ℃ again, carry out solution heat treatment by 1 hour/40mm wall thickness, the water-cooled immediately of coming out of the stove then.
3, thin brilliant strength-toughening treatment process after the forging of generating set usefulness 1Mn18Cr18N 18 N steel guard ring forging according to claim 1, it is characterized in that: described give cold deformation and once more solution heat treatment be meant: the 18 N steel guard ring forging that will carry out roughing and solution heat treatment in room temperature-360 ℃ down carries out cold deformation in advance by external diameter cold deformation amount 5-15% to be handled, or directly will carry out rough machined 18 N steel guard ring forging and under room temperature-360 ℃, carry out cold deformation in advance and handle by external diameter cold deformation amount 5-15%, then with forging≤300 ℃ of following shove charges, and directly be warmed up to 1040-1050 ℃ by the heat treatment furnace top speed, carry out solution heat treatment once more by 1 hour/65mm wall thickness, the water-cooled immediately of coming out of the stove at last.
4, thin brilliant strength-toughening treatment process after the forging of generating set usefulness 1Mn18Cr18N 18 N steel guard ring forging according to claim 1, it is characterized in that: describedly come out of the stove immediately that water-cooled is meant: forging from the back of coming out of the stove to pitch time≤15 of entry minute, forging air blast seethe and round-robin water in move up and down and be not less than 5 minutes.
5, thin brilliant strength-toughening treatment process after the forging of generating set usefulness 1Mn18Cr18N 18 N steel guard ring forging according to claim 1, it is characterized in that: described 18 N steel guard ring forging is meant: adopt electroslag ingot or electroslag blank forging also to forge the 1Mn18Cr18N steel loop shape or the cylindrical forged piece of back air cooling processing or water-cooled thermomechanical treatment.
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| CNB2008100449975A CN100554441C (en) | 2008-03-17 | 2008-03-17 | Thin brilliant strength-toughening treatment process after the forging of generating set usefulness 1Mn18Cr18N 18 N steel guard ring forging |
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| CNB2008100449975A CN100554441C (en) | 2008-03-17 | 2008-03-17 | Thin brilliant strength-toughening treatment process after the forging of generating set usefulness 1Mn18Cr18N 18 N steel guard ring forging |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102248382A (en) * | 2011-07-18 | 2011-11-23 | 江阴市燎原锻压有限公司 | Process for machining retaining ring forged piece of wind driven generator |
| CN105414425A (en) * | 2015-11-04 | 2016-03-23 | 武汉重工铸锻有限责任公司 | Forging method capable of eliminating coarse grains in forge piece and obtaining uniform and fine grain structure |
| CN105441780A (en) * | 2015-11-25 | 2016-03-30 | 上海加宁新技术研究所 | Method for manufacturing large motor 1Mn18Cr18N nonmagnetic guard ring |
| CN113275494A (en) * | 2021-06-01 | 2021-08-20 | 上海电气上重铸锻有限公司 | Forging method of 1Mn18Cr18N steel retaining ring |
-
2008
- 2008-03-17 CN CNB2008100449975A patent/CN100554441C/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102248382A (en) * | 2011-07-18 | 2011-11-23 | 江阴市燎原锻压有限公司 | Process for machining retaining ring forged piece of wind driven generator |
| CN105414425A (en) * | 2015-11-04 | 2016-03-23 | 武汉重工铸锻有限责任公司 | Forging method capable of eliminating coarse grains in forge piece and obtaining uniform and fine grain structure |
| CN105441780A (en) * | 2015-11-25 | 2016-03-30 | 上海加宁新技术研究所 | Method for manufacturing large motor 1Mn18Cr18N nonmagnetic guard ring |
| CN113275494A (en) * | 2021-06-01 | 2021-08-20 | 上海电气上重铸锻有限公司 | Forging method of 1Mn18Cr18N steel retaining ring |
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| CN100554441C (en) | 2009-10-28 |
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