CN103031500B - Large-diameter flange and preparation process thereof - Google Patents
Large-diameter flange and preparation process thereof Download PDFInfo
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- CN103031500B CN103031500B CN201210561226.XA CN201210561226A CN103031500B CN 103031500 B CN103031500 B CN 103031500B CN 201210561226 A CN201210561226 A CN 201210561226A CN 103031500 B CN103031500 B CN 103031500B
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Abstract
The invention discloses a large-diameter flange and a preparation process thereof. The large-diameter flange comprises the following chemical components by weight percent: 0.45 to 0.65% of C, 0.25 to 0.30% of Si, 0.85 to 0.95% of Mn, 9 to 11% of Ni, 2 to 3 % of Cr, 0.15 to 0.20% of Nb, 0.85 to 0.95% of Cu, 0.02 to 0.04% of N, 0.13 to 0.15% of Mo, 0.2 to 0.3% of Al, 0.07 to 0.09% of S, 0.03 to 0.04% of Ti, 0.02 to 0.03% of V, 0.002 to 0.004% of B, 6 to 8% of lanthanide rare earth, and the balance of Fe. The processes of twice normalizing and twice tempering and the cooling thermal treatment process are adopted, the flange is guaranteed to have high tensile strength, high yield strength and smaller surface roughness, the structure is more stable and more uniform, and air holes and sand holes are little.
Description
Technical field
The present invention relates to a kind of flange and manufacturing process, specifically a kind of Big Diameter Flange and manufacturing process thereof.
Background technology
Flange (Flange), is again ring flange or flange.Flange is to make pipe and the interconnective part of pipe, is connected in pipe end; Also the flange that has the equipment that is used in to import and export, for the connection between two equipment, as step-down gear flange.Flange connects or flanged coupling, refers to by flange, pad and bolt three and interconnects the releasable connection as one group of combined sealing structure, and pipe flange means the flange that in plumbing installation, pipe arrangement is used, and is used in the import and export flange that means equipment on equipment.Perforation on flange, bolt is close to two flanges.Between flange, seal with liner.Flange divides be threaded (screwed connection) flange and welding flange and clip flange.
The material of flange generally has: carbon steel, steel alloy and stainless steel; Big Diameter Flange requires tensile strength good, and yield strength is high, and surfaceness is little; And in high prior art, due to the restriction of composition and thermal treatment process, thereby cause flange tensile strength not high, high-yield strength is not high, and surfaceness is higher, and has the problems such as tissue looseness, pore, trachoma, do not meet the service requirements of Big Diameter Flange, or work-ing life is shorter.
Summary of the invention
Technical problem to be solved by this invention is:
How to ensure that flange has high-tensile and high-yield strength;
How to ensure that flange has less surfaceness, organize more uniform and stable, few pore and trachoma.
The technical scheme that the present invention solves above technical problem is:
A kind of Big Diameter Flange, the mass percent of its chemical composition is: C:0.45-0.65%, Si:0.25-0.30%, Mn:0.85-0.95%, Ni:9-11%, Cr:2-3%, Nb:0.15-0.20%, Cu:0.85-0.95%, N:0.02-0.04%, Mo:0.13-0.15%, Al:0.2-0.3%, S:0.07-0.09%, Ti:0.03-0.04%, V:0.02-0.03%, B:0.002-0.004%, lanthanide rare: 6-8%, surplus is Fe.
The manufacturing process of Big Diameter Flange, is undertaken by following operation: steel billet blanking-forging-forging size and surface inspection-thermal treatment-mechanical roughing-ultrasonic testing-mechanicl test-machine finshing is to desired shape and size-end treatment;
Heat treatment step employing double normalizing+double tempering+cooling, normalizing temperature is greater than normalizing temperature for the second time for the first time, and tempering temperature is greater than tempering temperature for the second time for the first time;
Normalizing for the first time: adopt zone heating, first paragraph Heating temperature is 700-750 DEG C, to the rear insulation of temperature 10-15min, second segment Heating temperature is 850-880 DEG C, after temperature, is incubated 35-40min, then after air cooling 10-15min, carries out normalizing for the second time;
Normalizing for the second time: adopt zone heating, first paragraph Heating temperature is 600-650 DEG C of heating, to the rear insulation of temperature 15-18min, second segment Heating temperature is 660-690 DEG C of heating, after temperature, is incubated 20-30min, then water-cooled is to room temperature;
Tempering for the first time: tempering temperature 550-640 DEG C is incubated 10-15min after temperature, then after air cooling 10-15min, carries out tempering for the second time;
Tempering for the second time: tempering temperature 500-540 DEG C is incubated 15-20min after temperature, then carries out cooling;
Cooling employing water-cooled is combined with air cooling, first adopt water-cooled with the rate of cooling of 1-3 DEG C/s by steel plate water-cooled to 450-470 DEG C, then air cooling is to 400-430 DEG C, adopt again water-cooled with the rate of cooling of 4-5 DEG C/s by steel plate water-cooled to 300-350 DEG C, then adopt water-cooled to be cooled to room temperature with the rate of cooling of 1-2 DEG C/s.
In above operation: steel billet blanking, forging, forging size and surface inspection, mechanical roughing, ultrasonic testing, mechanicl test, machine finshing to desired shape and size and end treatment all used existing conventional process.
The technical scheme that the present invention further limits is:
Aforesaid Big Diameter Flange, the constituent mass per-cent of lanthanide rare is: lanthanum: 20-24%, cerium: 20-25%, samarium: 14-16%, neodymium: 14-16%, gadolinium: 2-4%, praseodymium: 16-18%, dysprosium: 5-6%, all the other lanthanon: 1-3%, above each component sum is 100%.
The present invention adopts double normalizing+double tempering technique+cooling thermal treatment process, makes the defects such as the banded structure of flange alleviate obviously after double normalizing, and structure refinement is even; Double tempering after normalizing, organizes more uniform and stablely, and more refinement of crystal grain, is greatly improved intensity, toughness and the low temperature impact properties of flange.Normalizing temperature, higher than normalizing temperature for the second time, makes normalizing for the second time not destroy the effect of normalizing for the first time for the first time, makes tissue thinning effect more obvious; Zone heating is taked in normalizing, and second segment heating can reduce temperature poor of surface and heart portion on the basis of first paragraph heating, makes thickness of flange direction fine microstructures even; Tempering temperature, higher than tempering temperature for the second time, makes tempering for the second time not destroy the effect of tempering for the first time for the first time, makes the more refinement of thickness of flange direction crystal grain, further reduces temperature poor of surface and heart portion, thereby makes surperficially to reach unanimity to heart portion performance; Coolingly be combined with air cooling by water-cooled, first with slower speed of cooling water-cooled, then carry out air cooling, last again by a fast slow water-cooled, not only can improve the toughness of flange and obtain good comprehensive mechanical property (specifically can see below the mechanical property of invention advantage part), and make to organize more uniform and stable, seldom there is pore and trachoma.
In a word, the present invention takes zone heating, can effectively shorten the time that adds of high temperature section, makes grain refinement effect more obvious, and the grain fineness number of organizing of thickness direction is reached unanimity; Adopt double normalizing, and normalizing temperature is higher for the first time, can crystal grain thinning, improve intensity and toughness simultaneously, and can alleviate or eliminate the defects such as banded structure, improve the overall impact property of flange; Double tempering after normalizing, and tempering temperature is higher for the first time, organizes more uniform and stablely, and low temperature impact properties further improves, and surface to heart portion performance reaches unanimity; After tempering, speed is given toughness and the good comprehensive mechanical property of acquisition that the method for cooling of closing not only can improve flange, and seldom occurs pore and trachoma.
Specific performance of the present invention can see the following form:
Table 1 the present invention and the contrast of conventional flange performance index
Embodiment
embodiment 1
The Big Diameter Flange of the present embodiment, the mass percent of its chemical composition is: C:0.65%, Si:0.25%, Mn:0.85%, Ni:9%, Cr:2%, Nb:0.15%, Cu:0.85%, N:0.02%, Mo:0.13%, Al:0.2%, S:0.07%, Ti:0.03%, V:0.02%, B:0.002%, lanthanide rare: 6%, surplus is Fe; The constituent mass per-cent of described lanthanide rare is: lanthanum: 20%, and cerium: 25%, samarium: 16%, neodymium: 14%, gadolinium: 2%, praseodymium: 17%, dysprosium: 5%, all the other lanthanon: 1%.
The manufacturing process of the present embodiment Big Diameter Flange, is undertaken by following operation: steel billet blanking-forging-forging size and surface inspection-thermal treatment-mechanical roughing-ultrasonic testing-mechanicl test-machine finshing is to desired shape and size-end treatment; Wherein, steel billet blanking, forging, forging size and surface inspection, mechanical roughing, ultrasonic testing, mechanicl test, machine finshing to desired shape and size and end treatment all used existing conventional process;
Heat treatment step employing double normalizing+double tempering+cooling, normalizing temperature is greater than normalizing temperature for the second time for the first time, and tempering temperature is greater than tempering temperature for the second time for the first time;
Normalizing for the first time: adopt zone heating, first paragraph Heating temperature is 700 DEG C, to the rear insulation of temperature 15min, second segment Heating temperature is 850 DEG C, after temperature, is incubated 40min, then after air cooling 10min, carries out normalizing for the second time;
Normalizing for the second time: adopt zone heating, first paragraph Heating temperature is 600 DEG C of heating, to the rear insulation of temperature 18min, second segment Heating temperature is 660 DEG C of heating, after temperature, is incubated 30min, then water-cooled is to room temperature;
Tempering for the first time: 550 DEG C of tempering temperatures, after temperature, be incubated 15min, then after air cooling 10min, carry out tempering for the second time;
Tempering for the second time: 500 DEG C of tempering temperatures, after temperature, be incubated 20min, then carry out cooling;
Cooling employing water-cooled is combined with air cooling, first adopt water-cooled with the rate of cooling of 1 DEG C/s by steel plate water-cooled to 470 DEG C, then air cooling to 400 DEG C, then adopt water-cooled with the rate of cooling of 5 DEG C/s by steel plate water-cooled to 300 DEG C, then adopt water-cooled to be cooled to room temperature with the rate of cooling of 1 DEG C/s.
embodiment 2
The Big Diameter Flange of the present embodiment, the mass percent of its chemical composition is: C:0.45%, Si:0.30%, Mn:0.95%, Ni:11%, Cr:3%, Nb:0.20%, Cu:0.95%, N:0.03%, Mo:0.14%, Al:0.3%, S:0.08%, Ti:0.04%, V:0.03%, B:0.003%, lanthanide rare: 7%, surplus is Fe; The constituent mass per-cent of described lanthanide rare is: lanthanum: 24%, and cerium: 20%, samarium: 15%, neodymium: 15%, gadolinium: 3%, praseodymium: 16%, dysprosium: 6%, all the other lanthanon: 1%.
The manufacturing process of the present embodiment Big Diameter Flange, is undertaken by following operation: steel billet blanking-forging-forging size and surface inspection-thermal treatment-mechanical roughing-ultrasonic testing-mechanicl test-machine finshing is to desired shape and size-end treatment; Wherein, steel billet blanking, forging, forging size and surface inspection, mechanical roughing, ultrasonic testing, mechanicl test, machine finshing to desired shape and size and end treatment all used existing conventional process;
Heat treatment step employing double normalizing+double tempering+cooling, normalizing temperature is greater than normalizing temperature for the second time for the first time, and tempering temperature is greater than tempering temperature for the second time for the first time;
Normalizing for the first time: adopt zone heating, first paragraph Heating temperature is 720 DEG C, to the rear insulation of temperature 12min, second segment Heating temperature is 860 DEG C, after temperature, is incubated 37min, then after air cooling 10min, carries out normalizing for the second time;
Normalizing for the second time: adopt zone heating, first paragraph Heating temperature is 630 DEG C of heating, to the rear insulation of temperature 17min, second segment Heating temperature is 670 DEG C of heating, after temperature, is incubated 25min, then water-cooled is to room temperature;
Tempering for the first time: 600 DEG C of tempering temperatures, after temperature, be incubated 13min, then after air cooling 13min, carry out tempering for the second time;
Tempering for the second time: 530 DEG C of tempering temperatures, after temperature, be incubated 18min, then carry out cooling;
Cooling employing water-cooled is combined with air cooling, first adopt water-cooled with the rate of cooling of 2 DEG C/s by steel plate water-cooled to 460 DEG C, then air cooling to 420 DEG C, then adopt water-cooled with the rate of cooling of 4 DEG C/s by steel plate water-cooled to 350 DEG C, then adopt water-cooled to be cooled to room temperature with the rate of cooling of 1 DEG C/s.
embodiment 3
The Big Diameter Flange of the present embodiment, the mass percent of its chemical composition is: C:0.55%, Si:0.25%, Mn:0.90%, Ni:10%, Cr:2%, Nb:0.18%, Cu:0.90%, N:0.04%, Mo:0.15%, Al:0.2%, S:0.09%, Ti:0.03%, V:0.02%, B:0.004%, lanthanide rare: 8%, surplus is Fe; The constituent mass per-cent of described lanthanide rare is: lanthanum: 20-24%, cerium: 20-25%, samarium: 14-16%, neodymium: 14-16%, gadolinium: 2-4%, praseodymium: 16-18%, dysprosium: 5-6%, all the other lanthanon: 1-3%.
The manufacturing process of the present embodiment Big Diameter Flange, is undertaken by following operation: steel billet blanking-forging-forging size and surface inspection-thermal treatment-mechanical roughing-ultrasonic testing-mechanicl test-machine finshing is to desired shape and size-end treatment; Wherein, steel billet blanking, forging, forging size and surface inspection, mechanical roughing, ultrasonic testing, mechanicl test, machine finshing to desired shape and size and end treatment all used existing conventional process;
Heat treatment step employing double normalizing+double tempering+cooling, normalizing temperature is greater than normalizing temperature for the second time for the first time, and tempering temperature is greater than tempering temperature for the second time for the first time;
Normalizing for the first time: adopt zone heating, first paragraph Heating temperature is 750 DEG C, to the rear insulation of temperature 10min, second segment Heating temperature is 880 DEG C, after temperature, is incubated 35min, then after air cooling 15min, carries out normalizing for the second time;
Normalizing for the second time: adopt zone heating, first paragraph Heating temperature is 650 DEG C of heating, to the rear insulation of temperature 15min, second segment Heating temperature is 690 DEG C of heating, after temperature, is incubated 20min, then water-cooled is to room temperature;
Tempering for the first time: 640 DEG C of tempering temperatures, after temperature, be incubated 10min, then after air cooling 15min, carry out tempering for the second time;
Tempering for the second time: 540 DEG C of tempering temperatures, after temperature, be incubated 15min, then carry out cooling;
Cooling employing water-cooled is combined with air cooling, first adopt water-cooled with the rate of cooling of 3 DEG C/s by steel plate water-cooled to 450 DEG C, then air cooling to 430 DEG C, then adopt water-cooled with the rate of cooling of 4 DEG C/s by steel plate water-cooled to 320 DEG C, then adopt water-cooled to be cooled to room temperature with the rate of cooling of 2 DEG C/s.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (6)
1. a Big Diameter Flange, is characterized in that: the mass percent of its chemical composition is: C:0.45-0.65%, Si:0.25-0.30%, Mn:0.85-0.95%, Ni:9-11%, Cr:2-3%, Nb:0.15-0.20%, Cu:0.85-0.95%, N:0.02-0.04%, Mo:0.13-0.15%, Al:0.2-0.3%, S:0.07-0.09%, Ti:0.03-0.04%, V:0.02-0.03%, B:0.002-0.004%, lanthanide rare: 6-8%, surplus is Fe.
2. Big Diameter Flange as claimed in claim 1, it is characterized in that: the constituent mass per-cent of described lanthanide rare is: lanthanum: 20-24%, cerium: 20-25%, samarium: 14-16%, neodymium: 14-16%, gadolinium: 2-4%, praseodymium: 16-18%, dysprosium: 5-6%, all the other lanthanon: 1-3%, above each component sum is 100%.
3. Big Diameter Flange as claimed in claim 1 or 2, is characterized in that: the mass percent of its chemical composition is: C:0.65%, Si:0.25%, Mn:0.85%, Ni:9%, Cr:2%, Nb:0.15%, Cu:0.85%, N:0.02%, Mo:0.13%, Al:0.2%, S:0.07%, Ti:0.03%, V:0.02%, B:0.002%, lanthanide rare: 6%, surplus is Fe; The constituent mass per-cent of described lanthanide rare is: lanthanum: 20%, and cerium: 25%, samarium: 16%, neodymium: 14%, gadolinium: 2%, praseodymium: 17%, dysprosium: 5%, all the other lanthanon: 1%.
4. Big Diameter Flange as claimed in claim 1 or 2, is characterized in that: the mass percent of its chemical composition is: C:0.45%, Si:0.30%, Mn:0.95%, Ni:11%, Cr:3%, Nb:0.20%, Cu:0.95%, N:0.03%, Mo:0.14%, Al:0.3%, S:0.08%, Ti:0.04%, V:0.03%, B:0.003%, lanthanide rare: 7%, surplus is Fe; The constituent mass per-cent of described lanthanide rare is: lanthanum: 24%, and cerium: 20%, samarium: 15%, neodymium: 15%, gadolinium: 3%, praseodymium: 16%, dysprosium: 6%, all the other lanthanon: 1%.
5. Big Diameter Flange as claimed in claim 1 or 2, is characterized in that: the mass percent of its chemical composition is: C:0.55%, Si:0.25%, Mn:0.90%, Ni:10%, Cr:2%, Nb:0.18%, Cu:0.90%, N:0.04%, Mo:0.15%, Al:0.2%, S:0.09%, Ti:0.03%, V:0.02%, B:0.004%, lanthanide rare: 8%, surplus is Fe; The constituent mass per-cent of described lanthanide rare is: lanthanum: 20-24%, cerium: 20-25%, samarium: 14-16%, neodymium: 14-16%, gadolinium: 2-4%, praseodymium: 16-18%, dysprosium: 5-6%, all the other lanthanon: 1-3%.
6. the manufacturing process of Big Diameter Flange described in claim 1 or 2, is undertaken by following operation: steel billet blanking-forging-forging size and surface inspection-thermal treatment-mechanical roughing-ultrasonic testing-mechanicl test-machine finshing is to desired shape and size-end treatment; It is characterized in that:
Described heat treatment step employing double normalizing+double tempering+cooling, normalizing temperature is greater than normalizing temperature for the second time for the first time, and tempering temperature is greater than tempering temperature for the second time for the first time;
Described normalizing for the first time: adopt zone heating, first paragraph Heating temperature is 700-750 DEG C, to the rear insulation of temperature 10-15min, second segment Heating temperature is 850-880 DEG C, after temperature, is incubated 35-40min, then after air cooling 10-15min, carries out normalizing for the second time;
Described normalizing for the second time: adopt zone heating, first paragraph Heating temperature is 600-650 DEG C of heating, to the rear insulation of temperature 15-18min, second segment Heating temperature is 660-690 DEG C, after temperature, is incubated 20-30min, then water-cooled is to room temperature;
Described tempering for the first time: tempering temperature 550-640 DEG C is incubated 10-15min after temperature, then after air cooling 10-15min, carries out tempering for the second time;
Described tempering for the second time: tempering temperature 500-540 DEG C is incubated 15-20min after temperature, then carries out cooling;
Described cooling employing water-cooled is combined with air cooling, first adopt water-cooled with the rate of cooling of 1-3 DEG C/s by steel plate water-cooled to 450-470 DEG C, then air cooling is to 400-430 DEG C, adopt again water-cooled with the rate of cooling of 4-5 DEG C/s by steel plate water-cooled to 300-350 DEG C, then adopt water-cooled to be cooled to room temperature with the rate of cooling of 1-2 DEG C/s.
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| CN104846299A (en) * | 2015-04-22 | 2015-08-19 | 苏州劲元油压机械有限公司 | Manufacturing process of high pressure-resistant overflow valve |
| CN104846298A (en) * | 2015-04-21 | 2015-08-19 | 苏州劲元油压机械有限公司 | Manufacturing technology of layered overflow valve |
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| CN105033575A (en) * | 2015-06-23 | 2015-11-11 | 中山市鸿程科研技术服务有限公司 | Machining technology of high-pressure flange |
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| JP3509603B2 (en) * | 1998-03-05 | 2004-03-22 | Ｊｆｅスチール株式会社 | Extra-thick H-section steel with excellent toughness and yield strength of 325 MPa or more |
| JP3520818B2 (en) * | 1999-10-08 | 2004-04-19 | Ｊｆｅスチール株式会社 | H-shaped steel for high-strength support with excellent strain-age aging embrittlement resistance |
| CN102433503A (en) * | 2011-12-16 | 2012-05-02 | 江阴同庆机械制造有限公司 | Wind power flange alloy steel and preparation technology of parts thereof |
| CN102703818A (en) * | 2012-06-11 | 2012-10-03 | 张家港海陆环形锻件有限公司 | Material for overweight ring forging and manufacturing process for ring forging |
| CN102728756B (en) * | 2012-06-27 | 2014-12-17 | 江苏金源锻造股份有限公司 | Wind power spindle flange upsetting process |
| CN102717237B (en) * | 2012-06-28 | 2015-03-11 | 江苏金源锻造股份有限公司 | Method for forming wind power flange |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104846298A (en) * | 2015-04-21 | 2015-08-19 | 苏州劲元油压机械有限公司 | Manufacturing technology of layered overflow valve |
| CN104846299A (en) * | 2015-04-22 | 2015-08-19 | 苏州劲元油压机械有限公司 | Manufacturing process of high pressure-resistant overflow valve |
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