CN105803180A - Post-welding stress treatment method for carbon steel valve body - Google Patents
Post-welding stress treatment method for carbon steel valve body Download PDFInfo
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- CN105803180A CN105803180A CN201610271212.2A CN201610271212A CN105803180A CN 105803180 A CN105803180 A CN 105803180A CN 201610271212 A CN201610271212 A CN 201610271212A CN 105803180 A CN105803180 A CN 105803180A
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- valve body
- post
- carbon steel
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- temperature
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a post-welding stress treatment method for a carbon steel valve body. The post-welding stress treatment method comprises three steps that firstly, post-welding heat treatment is conducted, specifically, the welded valve body is heated to the temperature of 890-910 DEG C and subjected to heat preservation for 1-1.5 hours, then the valve body is cooled to the temperature of 700-720 DEG C and subjected to heat preservation for 1-1.5 hours, the valve body is cooled to the temperature of 500-510 DEG C and subjected to heat preservation for 0.5-1 hour, and the valve body is taken out and subjected to air cooling to the room temperature; secondly, secondary tempering is conducted, specifically, the cooled valve body is heated again to the temperature of 300-320 DEG C and subjected to heat preservation for 2-2.5 hours, and then the valve body is taken out and subjected to air cooling to the room temperature; and thirdly, performance heat treatment is conducted, specifically, the cooled valve body is heated again to the temperature of 1100-1150 DEG C and subjected to heat preservation for 3-3.5 hours, and then the valve body is taken out and subjected to air cooling to the room temperature. According to the post-welding stress treatment method for the valve body, corresponding heat treatment is conducted after welding, the form of alloy carbides of a carbon steel valve material is changed, the dispersity of the alloy carbides is improved, and nonuniformity of welding stress distribution is improved; the performance heat treatment is conducted after welding, and thus coarse grains are completely eliminated; the secondary tempering technique is adopted, and thus the effect that no quenched martensite structure exists in a basal body is guaranteed; and in this way, the treated carbon steel valve can be applied to the high-temperature environment and the low-temperature environment.
Description
Technical field
The present invention relates to a kind of stress processing method, more precisely, be a kind of carbon steel valve body post-weld stress process side
Method.
Background technology
Carbon steel valve is must be a kind of in gate valve system, and simply material is different, and material is carbon steel, and opening and closing element is flashboard,
The direction of motion of flashboard is perpendicular with flow direction, can only make standard-sized sheet and fully closed can not make adjustments and throttle.Flashboard have two close
Front cover, two sealing surfaces formation wedge shapes of the most frequently used carbon steel valve, key groove are different with valve parameter, the wherein lock of Wedge Gate Valves
Plate can be integrally formed, and is called rigidity flashboard.The flashboard that can produce micro-deformation can also be made, to improve its technique
Property, making up the deviation that sealing surface angle produces in the course of processing, this flashboard is called flexible disc.
Carbon steel valve body is welded by foundry goods under normal circumstances, can produce planted agent between foundry goods and the weldering body after welding
Power, the existence certainty butt welding hot-zone material internal toughness of internal stress constitutes impact, limits the applied environment of valve, in temperature mistake
Cannot use in the environment of high or temperature is too low.
Summary of the invention
The present invention mainly solves the technical problem existing for prior art, thus provides one relatively limits to remove
The processing method of carbon steel valve body post-weld stress.
The above-mentioned technical problem of the present invention is mainly addressed by following technical proposals:
A kind of carbon steel valve body post-weld stress processing method, it is characterised in that comprise the steps of:
1. post weld heat treatment: being heated to 890-910 DEG C in welding rear valve body is placed in stove and be incubated 1-1.5 hour, furnace temperature is down to
700-720 DEG C and be incubated 1-1.5 hour, furnace temperature is down to 500-510 DEG C and is incubated 0.5-1 hour, valve body takes out air cooling to room
Temperature；
2. double tempering: be heated to 300 DEG C-320 DEG C and be incubated 2-2.5 hour, so in the valve body after cooling is placed again into stove
After valve body is taken out air cooling to room temperature；
3. property heat treatment: be heated to 1100-1150 DEG C and be incubated 3-3.5 hour in the valve body after cooling is placed again into stove,
Then valve body is taken out air cooling to room temperature.
As preferred embodiment of the present invention, described step 1. controling of the pressure of the oven is between 1.0-1.2MPa.
As preferred embodiment of the present invention, described step 2. controling of the pressure of the oven is between 0.8-1.0MPa.
As preferred embodiment of the present invention, described step 3. controling of the pressure of the oven is between 1.8-2.0MPa.
The carbon steel valve body post-weld stress processing method of the present invention carries out corresponding heat treatment after welding sequence, changes carbon
The form of steel valve material alloys carbide, improves the spread of alloy carbide, improves the inhomogeneities of welding stress distribution, weldering
After carry out property heat treatment, thoroughly eliminate coarse-grain, use double tempering technique, it is ensured that matrix does not exist quenched martensite group
Knit, so process after carbon steel valve can higher and relatively low in the environment of application.
Detailed description of the invention
The example of several carbon steel valve body post-weld stress processing method particularized below:
Embodiment 1
1. post weld heat treatment: being heated to 890 DEG C in welding rear valve body is placed in stove and be incubated 1 hour, controling of the pressure of the oven is at 1MPa, stove
Temperature drop is to 700 DEG C and is incubated 1 hour, and furnace temperature is down to 500 and is incubated 0.5 hour, valve body takes out air cooling to room temperature；
2. double tempering: being heated to 300 DEG C and be incubated 2 hours in the valve body after cooling is placed again into stove, controling of the pressure of the oven exists
0.8MPa, then takes out air cooling to room temperature by valve body；
3. property heat treatment: being heated to 1100 DEG C and be incubated 3 hours in the valve body after cooling is placed again into stove, controling of the pressure of the oven exists
1.8MPa, then takes out air cooling to room temperature by valve body.
The mechanical performance using above method process rear valve body is as follows: hot strength: 1642MPa；
Embodiment 2
1. post weld heat treatment: being heated to 900 DEG C in welding rear valve body is placed in stove and be incubated 1.2 hours, controling of the pressure of the oven exists
1.1MPa, furnace temperature is down to 710 DEG C and is incubated 1.2 hours, and furnace temperature is down to 505 DEG C and is incubated 0.7 hour, valve body takes out air cooling extremely
Room temperature；
2. double tempering: being heated to 310 DEG C and be incubated 2.2 hours in the valve body after cooling is placed again into stove, controling of the pressure of the oven exists
0.9MPa, then takes out air cooling to room temperature by valve body；
3. property heat treatment: be heated to 1120 DEG C and be incubated 3.2 hours in the valve body after cooling is placed again into stove, controling of the pressure of the oven
At 1.9MPa, then valve body is taken out air cooling to room temperature.
The mechanical performance using above method process rear valve body is as follows: hot strength: 1706MPa；
Embodiment 3
1. post weld heat treatment: being heated to 910 DEG C in welding rear valve body is placed in stove and be incubated 1.5 hours, controling of the pressure of the oven exists
1.2MPa, furnace temperature is down to 720 DEG C and is incubated 1.5 hours, and furnace temperature is down to 510 DEG C and is incubated 1 hour, valve body takes out air cooling to room
Temperature；
2. double tempering: being heated to 320 DEG C and be incubated 2.5 hours in the valve body after cooling is placed again into stove, controling of the pressure of the oven exists
1MPa, then takes out air cooling to room temperature by valve body；
3. property heat treatment: be heated to 1150 DEG C and be incubated 3.5 hours in the valve body after cooling is placed again into stove, controling of the pressure of the oven
At 2MPa, then valve body is taken out air cooling to room temperature.
The mechanical performance using above method process rear valve body is as follows: hot strength: 1687MPa；
The carbon steel valve body post-weld stress processing method of the present invention carries out corresponding heat treatment after welding sequence, changes carbon steel valve
The form of material alloys carbide, improves the spread of alloy carbide, improves the inhomogeneities of welding stress distribution, and postwelding enters
Row property heat treatment, thoroughly eliminates coarse-grain, uses double tempering technique, it is ensured that there is not quenched martensite tissue in matrix, this
Sample process after carbon steel valve can higher and relatively low in the environment of application.
Claims (4)
1. a carbon steel valve body post-weld stress processing method, it is characterised in that comprise the steps of:
Post weld heat treatment: being heated to 890-910 DEG C in welding rear valve body is placed in stove and be incubated 1-1.5 hour, furnace temperature is down to
700-720 DEG C and be incubated 1-1.5 hour, furnace temperature is down to 500-510 DEG C and is incubated 0.5-1 hour, valve body takes out air cooling to room
Temperature；
Double tempering: be heated to 300-320 DEG C and be incubated 2-2.5 hour in the valve body after cooling is placed again into stove, then will
Valve body takes out air cooling to room temperature；
Property heat treatment: be heated to 1100-1150 DEG C and be incubated 3-3.5 hour, so in the valve body after cooling is placed again into stove
After valve body is taken out air cooling to room temperature.
Carbon steel valve body post-weld stress processing method the most according to claim 1, it is characterised in that described step 1. stove
Voltage-controlled system is between 1.0-1.2MPa.
Carbon steel valve body post-weld stress processing method the most according to claim 2, it is characterised in that described step 2. stove
Voltage-controlled system is between 0.8-1.0MPa.
Carbon steel valve body post-weld stress processing method the most according to claim 3, it is characterised in that described step 3. stove
Voltage-controlled system is between 1.8-2.0MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610271212.2A CN105803180A (en) | 2016-04-28 | 2016-04-28 | Post-welding stress treatment method for carbon steel valve body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610271212.2A CN105803180A (en) | 2016-04-28 | 2016-04-28 | Post-welding stress treatment method for carbon steel valve body |
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| Publication Number | Publication Date |
|---|---|
| CN105803180A true CN105803180A (en) | 2016-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610271212.2A Pending CN105803180A (en) | 2016-04-28 | 2016-04-28 | Post-welding stress treatment method for carbon steel valve body |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102922228A (en) * | 2012-10-15 | 2013-02-13 | 南通市电站阀门有限公司 | Valve manufacturing process for improving impact toughness of F92 butt welding heat affected area |
| CN103350287A (en) * | 2013-08-01 | 2013-10-16 | 南通国电电站阀门有限公司 | F92 valve body and F22 piping dissimilar steel butt-welding technology |
-
2016
- 2016-04-28 CN CN201610271212.2A patent/CN105803180A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102922228A (en) * | 2012-10-15 | 2013-02-13 | 南通市电站阀门有限公司 | Valve manufacturing process for improving impact toughness of F92 butt welding heat affected area |
| CN103350287A (en) * | 2013-08-01 | 2013-10-16 | 南通国电电站阀门有限公司 | F92 valve body and F22 piping dissimilar steel butt-welding technology |
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Application publication date: 20160727 |
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