CN105986081A - Heat treatment process of steel TP92 - Google Patents
Heat treatment process of steel TP92 Download PDFInfo
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- CN105986081A CN105986081A CN201510047843.1A CN201510047843A CN105986081A CN 105986081 A CN105986081 A CN 105986081A CN 201510047843 A CN201510047843 A CN 201510047843A CN 105986081 A CN105986081 A CN 105986081A
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Abstract
The invention discloses a heat treatment process of steel TP92, which is characterized by comprising the following steps: 1) the heating zone width; 2) the insulation zone width; F. a heating method for heat treatment, heat treatment with uniform temperature is carried out at inner and outer walls and on both sides of the weld seam, the temperature difference between any two points in a heating range at constant temperature is less than 50 DEG C; electric heating is employing on the pipes with the caliber of greater than or equal to 108 mm and the thickness of greater than 10 mm; G. the heat treatment temperature-measuring points are distributed at two sides of the weld seam, the number of the heat treatment temperature-measuring points is no less than two, the horizontal pipes are arranged symmetrically up and down; H. the heat treatment is immediately carried out after welding, and should be continuously carried out; I, when a welded junction after the heat treatment is required of partial repair welding due to welding defect, the heat treatment is re-carried out after repair welding; and J. for the weld joint which cannot be equipped with a heating device, the measurements are worked out, and flame heating is employed. The heat treatment process has the advantages of reasonable process and low manufacture cost.
Description
Technical field
The present invention relates to a kind of TP92 steel heat treatment process.
Background technology
Existing TP92 steel heat treatment process 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 TP92 steel heat treatment process of low cost of manufacture.
For achieving the above object, the invention provides
A kind of TP92 steel heat treatment process, comprises the steps:
The width of heating of T/P92 heat treatment and insulation width should be calculated as follows formula and perform:
1) hot zone width
The minimum hot zone width recommended takes off the maximum of face three formula
HO=S+50
H1=S+4
Wherein:
Hi: for the ratio of pipeline heating tape area with area of dissipation, to horizontally disposed, nominal diameter at the pipeline of below DN150, and during only one of which circumference computer heating control district, its Hi desirable 5；To below the pipeline of more than nominal diameter DN150, dimension D N150 but have the horizontal pipe in two or more circumference computer heating control district and all of vertical pipe, Hi takes 3；
The external diameter of D: pipeline；
The internal diameter of d: pipeline；
S: weld width+(minima in both 2t or 50mm)
R: pipe radius；
The nominal thickness of t: pipeline
2) heat preservation zone width
The minimum heat preservation zone width recommended is:
H+4
Wherein H is heating region width；
F, the heating means of heat treatment, should make every effort to inside and outside wall and weld seam both sides homogeneous temperature, and during constant temperature, in heated perimeter, the temperature difference of any two points should be less than 50 DEG C；Caliber >=108mm, the thickness pipe more than 10mm should be used electrical heating, and boiler superheater pipe should use electrical heating as far as possible；
G, heat treatment point for measuring temperature should be distributed in weld seam both sides, must not be less than 2 points, and horizontal pipe should layout symmetrical above and below；
H, weld and complete should carry out heat treatment immediately, heat treatment work should be carried out continuously, and when being forced to interrupt such as fault, should take slow cooling measure effective to heated weldment (as wrapped heat-preservation cotton slow cooling immediately), after pending fault is got rid of, heat treatment should be re-started by code requirement；
I, the most heat treated weld bond, during as carried out local repair welding because of weld defect, answer another warm to process after repair welding；
J, to the welding point of heater cannot be installed, obtain after technical staff ratifies and worked out measure, flame can be used to heat；
K, hyper-thick pipe pipe (wall thickness >=70mm) must overall process temperature tracing control, be welded to for the first time about 20mm place, do after-baking (350 DEG C constant temperature 2 hours) immediately, after RT detection is qualified, again preheating, tracing control, after welding all terminates, does high tempering and processes.
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:
A kind of TP92 steel heat treatment process, comprises the steps:
The width of heating of T/P92 heat treatment and insulation width should be calculated as follows formula and perform:
1) hot zone width
The minimum hot zone width recommended takes off the maximum of face three formula
HO=S+50
H1=S+4
Wherein:
Hi: for the ratio of pipeline heating tape area with area of dissipation, to horizontally disposed, nominal diameter at the pipeline of below DN150, and during only one of which circumference computer heating control district, its Hi desirable 5；To below the pipeline of more than nominal diameter DN150, dimension D N150 but have the horizontal pipe in two or more circumference computer heating control district and all of vertical pipe, Hi takes 3；
The external diameter of D: pipeline；
The internal diameter of d: pipeline；
S: weld width+(minima in both 2t or 50mm)
R: pipe radius；
The nominal thickness of t: pipeline
2) heat preservation zone width
The minimum heat preservation zone width recommended is:
H+4
Wherein H is heating region width；
F, the heating means of heat treatment, should make every effort to inside and outside wall and weld seam both sides homogeneous temperature, and during constant temperature, in heated perimeter, the temperature difference of any two points should be less than 50 DEG C；Caliber >=108mm, the thickness pipe more than 10mm should be used electrical heating, and boiler superheater pipe should use electrical heating as far as possible；
G, heat treatment point for measuring temperature should be distributed in weld seam both sides, must not be less than 2 points, and horizontal pipe should layout symmetrical above and below；
H, weld and complete should carry out heat treatment immediately, heat treatment work should be carried out continuously, and when being forced to interrupt such as fault, should take slow cooling measure effective to heated weldment (as wrapped heat-preservation cotton slow cooling immediately), after pending fault is got rid of, heat treatment should be re-started by code requirement；
I, the most heat treated weld bond, during as carried out local repair welding because of weld defect, answer another warm to process after repair welding；
J, to the welding point of heater cannot be installed, obtain after technical staff ratifies and worked out measure, flame can be used to heat；
K, hyper-thick pipe pipe (wall thickness >=70mm) must overall process temperature tracing control, be welded to for the first time about 20mm place, do after-baking (350 DEG C constant temperature 2 hours) immediately, after RT detection is qualified, again preheating, tracing control, after welding all terminates, does high tempering and processes.
Claims (1)
1. a TP92 steel heat treatment process, it is characterised in that comprise the steps:
The width of heating of T/P92 heat treatment and insulation width should be calculated as follows formula and perform:
1) hot zone width
Minimum hot zone width takes off the maximum of face three formula
HO=S+50
H1=S+4
Wherein:
Hi: for the ratio of pipeline heating tape area with area of dissipation；
The external diameter of D: pipeline；
The internal diameter of d: pipeline；
S: weld width+(minima in both 2t or 50mm)
R: pipe radius；
The nominal thickness of t: pipeline
2) heat preservation zone width
Minimum heat preservation zone width is:
H+4
Wherein H is heating region width；
F, the heating means of heat treatment, should make every effort to inside and outside wall and weld seam both sides homogeneous temperature, and during constant temperature, in heated perimeter, the temperature difference of any two points should be less than 50 DEG C；Caliber >=108mm, the thickness pipe more than 10mm should be used electrical heating；
G, heat treatment point for measuring temperature should be distributed in weld seam both sides, must not be less than 2 points, and horizontal pipe should layout symmetrical above and below；
H, welding the complete heat treatment that should carry out immediately, heat treatment work should be carried out continuously；
I, the most heat treated weld bond, when need to carry out local repair welding because of weld defect, answer another warm to process after repair welding；
J, to the welding point of heater cannot be installed, obtain after technical staff ratifies and worked out measure, flame can be used to heat；
K, hyper-thick pipe pipe, the palpus overall process temperature tracing control of wall thickness >=70mm, it is welded to about 20mm place for the first time, does after-baking immediately, after RT detection is qualified, preheating, tracing control again, after welding all terminates, does high tempering and processes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510047843.1A CN105986081A (en) | 2015-01-30 | 2015-01-30 | Heat treatment process of steel TP92 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510047843.1A CN105986081A (en) | 2015-01-30 | 2015-01-30 | Heat treatment process of steel TP92 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105986081A true CN105986081A (en) | 2016-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510047843.1A Pending CN105986081A (en) | 2015-01-30 | 2015-01-30 | Heat treatment process of steel TP92 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108754113A (en) * | 2018-06-15 | 2018-11-06 | 中国电建集团山东电力建设第工程有限公司 | A kind of local heat dissipation type pipe group weld seam heat treatment process of whole heating |
| WO2021184537A1 (en) * | 2020-03-20 | 2021-09-23 | 中国石油大学(华东) | Local heat treatment method for regulating residual stress by primary and auxiliary heating |
-
2015
- 2015-01-30 CN CN201510047843.1A patent/CN105986081A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108754113A (en) * | 2018-06-15 | 2018-11-06 | 中国电建集团山东电力建设第工程有限公司 | A kind of local heat dissipation type pipe group weld seam heat treatment process of whole heating |
| WO2021184537A1 (en) * | 2020-03-20 | 2021-09-23 | 中国石油大学(华东) | Local heat treatment method for regulating residual stress by primary and auxiliary heating |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20161005 |
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| WD01 | Invention patent application deemed withdrawn after publication |