CN105986106A - Postweld heat treatment technology of steel tube - Google Patents
Postweld heat treatment technology of steel tube Download PDFInfo
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- CN105986106A CN105986106A CN201510047385.1A CN201510047385A CN105986106A CN 105986106 A CN105986106 A CN 105986106A CN 201510047385 A CN201510047385 A CN 201510047385A CN 105986106 A CN105986106 A CN 105986106A
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Abstract
The invention discloses a postweld heat treatment technology of steel tube. The postweld heat treatment technology of steel tube comprises the following steps: 1) the postweld heat treatment requirements: the 15CrMo tube with wall thickness of greater than 10mm and the caliber of greater than 108 mm as well as 12Cr1MoV tube with wall thickness of greater than 8mm and the caliber of greater than 108 mm are subjected to heat treatment after being welded; wherein heat preservation and slow cooling should be carried out if the heat treatment is not required after welding; 2) the heat processing operation procedures are prescribed; 3) the heating and cooling speed of the 15CrMo and 12Cr1MoV tubes is calculated according to 6250/thickness(DEG C/h) and is no greater than 300 DEG C/h, the temperature during a cooling process is less than 300 DEG C and cannot be controlled, 4) the postweld heat treatment of a xenogenesis steel welded joint should be compressively considered according to steel and the used welding rod (welding wire) at two sides, the heat treatment temperature generally does not exceed a lower critical of lower side steel of an alloy component; and 5) the heating width of the heat treatment can be calculated from the center of the welded seam, the preheating width at each side is 3 times or above the thickness of the tube, and the thickness is no less than 60 mm. The heat treatment technology has the advantages of reasonable process and low manufacture cost.
Description
Technical field
The present invention relates to the post weld heat treatment technique of a kind of steel pipe.
Background technology
The post weld heat treatment technique of existing steel pipe exists that procedure arrangement is unreasonable, operation is various, higher to operator's skill requirement so that production cost is higher.
Summary of the invention
Because the drawbacks described above of prior art, the technical problem to be solved be to provide a kind of operation rationally, the post weld heat treatment technique of the steel pipe of low cost of manufacture.
For achieving the above object, the invention provides
The post weld heat treatment technique of a kind of steel pipe, comprises the steps:
1), post weld heat treatment requirement
All wall thickness must carry out heat treatment more than the 15CrMo pipe of 108mm, wall thickness more than 8mm, the caliber 12Cr1MoV pipe postwelding more than 108mm more than 10mm, caliber.The postwelding that need not heat treatment should carry out being incubated slow cooling.
2), cooking schedule
3), 15CrMo, 12Cr1MoV pipe heating, cooling speed, typically can calculate by 6250/ wall thickness (DEG C/h), and no more than 300 DEG C/h, in temperature-fall period, less than 300 DEG C can not control.
4), the post weld heat treatment of Dissimilar Steel Welded Joint, should consider by both sides steel and welding rod used (welding wire).Heat treatment temperature is usually no more than the lower critical of alloy composition downside steel.
5), the width of heating of heat treatment, count from Weld pipe mill, every side is not less than three times of pipe wall thickness, and not less than 60mm.
6), the insulation width of heat treatment, count from Weld pipe mill, every side is not less than five times of pipe wall thickness, to reduce thermograde.Instrument used, thermocouple and adnexa should be demarcated according to the requirement of metering or verify.
7), the heating means of heat treatment, the method using remote control crawler type resistance heating, specifically used method is as follows:
7.1) thermocouple symmetry being fixed on weld seam both sides, horizontal tube is placed up and down, and standpipe is symmetrically placed, pops one's head in good with bead contact, then heating tape is wrapped in welded joints, bandages with insulation material, switch on power and process.
7.2), during heat treatment, the temporary support of pipeline should be removed after heat treatment, and the weld seam of weight bearing area should add temporary support at heat treatment, in case being deformed in processing procedure.The heating tape of standpipe should prevent it from falling.During constant temperature, in heated perimeter, the temperature difference of any two points should be less than 50 DEG C.
7.3) after heat treatment, should make a record and labelling, and stamp steel seal number or the permanent marker of heat treatment work.
7.4) weld seam after heat treatment need to carry out hardness test.Weld hardness after heat treatment is usually no more than mother metal Brinell hardness and adds 100, and less than 270.
The invention has the beneficial effects as follows: operation of the present invention is reasonable, low cost of manufacture.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described:
The post weld heat treatment technique of a kind of steel pipe, comprises the steps:
1), post weld heat treatment requirement
All wall thickness must carry out heat treatment more than the 15CrMo pipe of 108mm, wall thickness more than 8mm, the caliber 12Cr1MoV pipe postwelding more than 108mm more than 10mm, caliber.The postwelding that need not heat treatment should carry out being incubated slow cooling.
2), cooking schedule
3), 15CrMo, 12Cr1MoV pipe heating, cooling speed, typically can calculate by 6250/ wall thickness (DEG C/h), and no more than 300 DEG C/h, in temperature-fall period, less than 300 DEG C can not control.
4), the post weld heat treatment of Dissimilar Steel Welded Joint, should consider by both sides steel and welding rod used (welding wire).Heat treatment temperature is usually no more than the lower critical of alloy composition downside steel.
5), the width of heating of heat treatment, count from Weld pipe mill, every side is not less than three times of pipe wall thickness, and not less than 60mm.
6), the insulation width of heat treatment, count from Weld pipe mill, every side is not less than five times of pipe wall thickness, to reduce thermograde.Instrument used, thermocouple and adnexa should be demarcated according to the requirement of metering or verify.
7), the heating means of heat treatment, the method using remote control crawler type resistance heating, specifically used method is as follows:
7.1) thermocouple symmetry being fixed on weld seam both sides, horizontal tube is placed up and down, and standpipe is symmetrically placed, pops one's head in good with bead contact, then heating tape is wrapped in welded joints, bandages with insulation material, switch on power and process.
7.2), during heat treatment, the temporary support of pipeline should be removed after heat treatment, and the weld seam of weight bearing area should add temporary support at heat treatment, in case being deformed in processing procedure.The heating tape of standpipe should prevent it from falling.During constant temperature, in heated perimeter, the temperature difference of any two points should be less than 50 DEG C.
7.3) after heat treatment, should make a record and labelling, and stamp steel seal number or the permanent marker of heat treatment work.
7.4) weld seam after heat treatment need to carry out hardness test.Weld hardness after heat treatment is usually no more than mother metal Brinell hardness and adds 100, and less than 270.
Claims (1)
1. the post weld heat treatment technique of a steel pipe, it is characterised in that comprise the steps:
1), post weld heat treatment requirement
All wall thickness must carry out heat treatment more than the 15CrMo pipe of 108mm, wall thickness more than 8mm, the caliber 12Cr1MoV pipe postwelding more than 108mm more than 10mm, caliber；
The postwelding that need not heat treatment should carry out being incubated slow cooling；
2), cooking schedule
3), 15CrMo, 12Cr1MoV pipe heating, cooling speed, typically can calculate by 6250/ wall thickness (DEG C/h), and no more than 300 DEG C/h, in temperature-fall period, less than 300 DEG C can not control；
4), the post weld heat treatment of Dissimilar Steel Welded Joint, should consider by both sides steel and welding rod used (welding wire)；Heat treatment temperature is usually no more than the lower critical of alloy composition downside steel；
5), the width of heating of heat treatment, count from Weld pipe mill, every side is not less than three times of pipe wall thickness, and not less than 60mm；
6), the insulation width of heat treatment, count from Weld pipe mill, every side is not less than five times of pipe wall thickness, to reduce thermograde；Instrument used, thermocouple and adnexa should be demarcated according to the requirement of metering or verify；
7), the heating means of heat treatment, the method using remote control crawler type resistance heating, specifically used method is as follows:
7.1) thermocouple symmetry being fixed on weld seam both sides, horizontal tube is placed up and down, and standpipe is symmetrically placed, pops one's head in good with bead contact, then heating tape is wrapped in welded joints, bandages with insulation material, switch on power and process；
7.2), during heat treatment, the temporary support of pipeline should be removed after heat treatment, and the weld seam of weight bearing area should add temporary support at heat treatment, in case being deformed in processing procedure；The heating tape of standpipe should prevent it from falling；During constant temperature, in heated perimeter, the temperature difference of any two points should be less than 50 DEG C；
7.3) after heat treatment, should make a record and labelling, and stamp steel seal number or the permanent marker of heat treatment work；
7.4) weld seam after heat treatment need to carry out hardness test；Weld hardness after heat treatment is usually no more than mother metal Brinell hardness and adds 100, and less than 270.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510047385.1A CN105986106A (en) | 2015-01-30 | 2015-01-30 | Postweld heat treatment technology of steel tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510047385.1A CN105986106A (en) | 2015-01-30 | 2015-01-30 | Postweld heat treatment technology of steel tube |
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| CN105986106A true CN105986106A (en) | 2016-10-05 |
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| CN201510047385.1A Pending CN105986106A (en) | 2015-01-30 | 2015-01-30 | Postweld heat treatment technology of steel tube |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107122556A (en) * | 2017-05-03 | 2017-09-01 | 柏诚工程股份有限公司 | A kind of manufacture method of the integrated cold water computer room of monoblock type |
| CN107619922A (en) * | 2017-09-29 | 2018-01-23 | 彭娟 | A kind of intermediate-frequency induction heating technique of heat-resistant high alloy steel weld bond |
| CN111334649A (en) * | 2020-04-15 | 2020-06-26 | 天津海运职业学院 | G115 steel small-diameter pipe heat treatment method through flexible ceramic resistance heating |
-
2015
- 2015-01-30 CN CN201510047385.1A patent/CN105986106A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107122556A (en) * | 2017-05-03 | 2017-09-01 | 柏诚工程股份有限公司 | A kind of manufacture method of the integrated cold water computer room of monoblock type |
| CN107619922A (en) * | 2017-09-29 | 2018-01-23 | 彭娟 | A kind of intermediate-frequency induction heating technique of heat-resistant high alloy steel weld bond |
| CN107619922B (en) * | 2017-09-29 | 2019-01-25 | 彭娟 | A kind of intermediate-frequency induction heating technique of heat-resistant high alloy steel weld bond |
| CN111334649A (en) * | 2020-04-15 | 2020-06-26 | 天津海运职业学院 | G115 steel small-diameter pipe heat treatment method through flexible ceramic resistance heating |
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Application publication date: 20161005 |