CN106480301A - The solid dissolving method of stress corrosion and metallographic phase transformation can be reduced - Google Patents
The solid dissolving method of stress corrosion and metallographic phase transformation can be reduced Download PDFInfo
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- CN106480301A CN106480301A CN201510545227.9A CN201510545227A CN106480301A CN 106480301 A CN106480301 A CN 106480301A CN 201510545227 A CN201510545227 A CN 201510545227A CN 106480301 A CN106480301 A CN 106480301A
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Abstract
The invention discloses a kind of solid dissolving method for reducing stress corrosion and metallographic phase transformation, for to duplex stainless steel 2205 heat exchanger tube post weld heat treatment, the method includes to carry out hyperthermic treatment to duplex stainless steel 2205 heat exchanger tube, isothermal holding and cooling are processed, the hyperthermic treatment is that the heat exchanger tube is heated to 1050-1070 DEG C, the isothermal holding is to be no less than the heat exchanger tube insulation after heating 300 seconds, the cooling is processed as carrying out chilling to the heat exchanger tube after insulation, the chilling is, in not more than 80 seconds, heat exchanger tube is cooled to normal temperature, and the hyperthermic treatment is carried out in two stages, first stage is that heat exchanger tube is heated to 90-120 DEG C by normal temperature, second stage is, within the 5-7 second, the end of a period of heat exchanger tube constant-speed heating to hyperthermic treatment is required temperature.This method process route is simple, with good solution treatment effect, beneficial to the surface quality of product.
Description
Technical field
The present invention relates to mechanical engineering Field of Heat-treatment, more particularly to a kind of solid dissolving method for reducing stress corrosion and metallographic phase transformation.
Background technology
Existing domestic 2205 stainless steel product species has 2205 stainless steel tubes, 2205 seamless two-phase stainless-steel pipes；2205 two-phase stainless steel boards, 2205 stainless steel barses, forging material, pipe fitting, band etc..The two phase stainless steel of early stage can be with the homogeneous corrosion of resistance to moderate strength and chlorine stress corrosion fracture, but when using in the case of welding, its performance can be substantially reduced.In order to improve such case, nitrogen just adds duplex stainless steel 2205, so that decay resistance is increased, and it is also very good to weld service condition.Due to the special performance characteristic of 2205 dual phase steels, it is of wide application, is the trade mark for using in a large number so far.Duplex stainless steel 2205 alloy is the compound stainless steel that 2.5% molybdenum and 4.5% nickel nitrogen alloy are constituted by 21% chromium.Existing 2205 two phase stainless steel welding heat exchanger tube manufacturing process is typically completed by bending forming and the welding of online TIG automatic welding.The heat exchanger tube for being generally completed welding can produce the strain of 10-20% on its surfaces externally and internally, some physics of heat exchanger tube, chemical property meeting significant change after cold plastic deformation, therefore, the performance recovery impact of the post weld heat treatment exchange heat pipe of duplex stainless steel 2205 heat exchanger tube is great.
Duplex stainless steel 2205 is compared with traditional pure iron ferritic or austenitic stainless steel, its phase transformation in heat treatment process is obvious, this is big on the performance of heat exchange tubes impact being welded using the material, as occurred the fragility at 450 DEG C or so and 800 DEG C or so to change, this allows for traditional stainless steel post weld heat treatment technique and is not suitable for duplex stainless steel 2205.
Content of the invention
Compare with traditional pure iron ferritic or austenitic stainless steel for above-mentioned duplex stainless steel 2205, its phase transformation in heat treatment process is obvious, this is big on the performance of heat exchange tubes impact being welded using the material, as occurred the fragility at 450 DEG C or so and 800 DEG C or so to change, this allows for the problem that traditional stainless steel post weld heat treatment technique is not suitable for duplex stainless steel 2205, the invention provides a kind of solid dissolving method for reducing stress corrosion and metallographic phase transformation.
The reduced stress corrosion provided for the problems referred to above, the present invention and the solid dissolving method of metallographic phase transformation reach goal of the invention by following technical essential：The solid dissolving method of stress corrosion and metallographic phase transformation can be reduced, for to duplex stainless steel 2205 heat exchanger tube post weld heat treatment, the method includes to carry out hyperthermic treatment to duplex stainless steel 2205 heat exchanger tube, isothermal holding and cooling are processed, the hyperthermic treatment is that the heat exchanger tube is heated to 1050-1070 DEG C, the isothermal holding is to be no less than the heat exchanger tube insulation after heating 300 seconds, the cooling is processed as carrying out chilling to the heat exchanger tube after insulation, the chilling is, in not more than 80 seconds, heat exchanger tube is cooled to normal temperature, and the hyperthermic treatment is carried out in two stages, first stage is that heat exchanger tube is heated to 90-120 DEG C by normal temperature, second stage is, within the 5-7 second, the end of a period of heat exchanger tube constant-speed heating to hyperthermic treatment is required temperature.
Specifically, in the heat treatment method that the present invention is provided, as a kind of solution treatment mode, it is disposed as being completed in a relatively short time with cooling treatment by heating, the pressure corrosion that can effectively greatly reduce or avoid which to occur at 450 DEG C or so and a phase transformation produced at 800 DEG C or so, using above heat treatment method, it is easy to obtain even tissue, hardness reduces, and welding pressure is eliminated, welded seam area metallographic is similar to mother metal metallographic or close, the heat exchanger tube of metallographic structure good stability.The process route for being carried out using hyperthermic treatment stage by stage, the dehumidifying of heat exchange pipe surface is completed during being easy in the first stage in the case that heat exchanger tube temperature is not high, the impact that moisture during solid solution exchanges tube surface quality can be prevented effectively from, the heat exchanger tube surface quality of any surface finish is obtained.
Further technical scheme is：
Limit as a kind of further technique beneficial to surface quality, the hyperthermic treatment, isothermal holding and cooling are processed and all carried out under anaerobic.
Used as a kind of specifically surface quality safeguard measure being easily achieved, the hyperthermic treatment, isothermal holding and cooling are processed and are carried out all in nitrogen environment.
As another kind of surface quality safeguard measure, it is intended to avoid heat transfer sheet surface because oxidation melanism, before the hyperthermic treatment, isothermal holding and cooling are processed, also includes oil removal treatment.
As the preferred of hyperthermic treatment finishing temperature, beneficial to solid solution effect, during the hyperthermic treatment, the finishing temperature of heat exchanger tube is 1065 DEG C.
The invention has the advantages that：
In the heat treatment method that the present invention is provided, as a kind of solution treatment mode, it is disposed as being completed in a relatively short time with cooling treatment by heating, the pressure corrosion that can effectively greatly reduce or avoid which to occur at 450 DEG C or so and a phase transformation produced at 800 DEG C or so, using above heat treatment method, it is easy to obtain even tissue, hardness reduces, and welding pressure is eliminated, welded seam area metallographic is similar to mother metal metallographic or close, the heat exchanger tube of metallographic structure good stability.The process route for being carried out using hyperthermic treatment stage by stage, the dehumidifying of heat exchange pipe surface is completed during being easy in the first stage in the case that heat exchanger tube temperature is not high, the impact that moisture during solid solution exchanges tube surface quality can be prevented effectively from, the heat exchanger tube surface quality of any surface finish is obtained.
Specific embodiment
With reference to embodiment, the present invention is described in further detail, but the structure of the present invention is not limited only to following examples.
Embodiment 1：
The solid dissolving method of stress corrosion and metallographic phase transformation can be reduced, for to duplex stainless steel 2205 heat exchanger tube post weld heat treatment, the method includes to carry out hyperthermic treatment to duplex stainless steel 2205 heat exchanger tube, isothermal holding and cooling are processed, the hyperthermic treatment is that the heat exchanger tube is heated to 1050-1070 DEG C, the isothermal holding is to be no less than the heat exchanger tube insulation after heating 300 seconds, the cooling is processed as carrying out chilling to the heat exchanger tube after insulation, the chilling is, in not more than 80 seconds, heat exchanger tube is cooled to normal temperature, and the hyperthermic treatment is carried out in two stages, first stage is that heat exchanger tube is heated to 90-120 DEG C by normal temperature, second stage is, within the 5-7 second, the end of a period of heat exchanger tube constant-speed heating to hyperthermic treatment is required temperature.
In the present embodiment, as a kind of solution treatment mode, it is disposed as being completed in a relatively short time with cooling treatment by heating, the pressure corrosion that can effectively greatly reduce or avoid which to occur at 450 DEG C or so and a phase transformation produced at 800 DEG C or so, using above heat treatment method, it is easy to obtain even tissue, hardness reduces, and welding pressure is eliminated, welded seam area metallographic is similar to mother metal metallographic or close, the heat exchanger tube of metallographic structure good stability.The process route for being carried out using hyperthermic treatment stage by stage, the dehumidifying of heat exchange pipe surface is completed during being easy in the first stage in the case that heat exchanger tube temperature is not high, the impact that moisture during solid solution exchanges tube surface quality can be prevented effectively from, the heat exchanger tube surface quality of any surface finish is obtained.
Embodiment 2：
The present embodiment is further qualified on the basis of embodiment 1, is limited as a kind of further technique beneficial to surface quality, and the hyperthermic treatment, isothermal holding and cooling are processed and all carried out under anaerobic.
Used as a kind of specifically surface quality safeguard measure being easily achieved, the hyperthermic treatment, isothermal holding and cooling are processed and are carried out all in nitrogen environment.
As another kind of surface quality safeguard measure, it is intended to avoid heat transfer sheet surface because oxidation melanism, before the hyperthermic treatment, isothermal holding and cooling are processed, also includes oil removal treatment.
As the preferred of hyperthermic treatment finishing temperature, beneficial to solid solution effect, during the hyperthermic treatment, the finishing temperature of heat exchanger tube is 1065 DEG C.
Above content is the further description that the present invention is made with reference to specific preferred embodiment, it is impossible to assert that the specific embodiment of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, the other embodiment that draws under without departing from technical scheme, should be included in protection scope of the present invention.
Claims (5)
1. the solid dissolving method of stress corrosion and metallographic phase transformation can be reduced, for to duplex stainless steel 2205 heat exchanger tube post weld heat treatment, the method includes to carry out hyperthermic treatment to duplex stainless steel 2205 heat exchanger tube, isothermal holding and cooling are processed, it is characterized in that, the hyperthermic treatment is that the heat exchanger tube is heated to 1050-1070 DEG C, the isothermal holding is to be no less than the heat exchanger tube insulation after heating 300 seconds, the cooling is processed as carrying out chilling to the heat exchanger tube after insulation, the chilling is, in not more than 80 seconds, heat exchanger tube is cooled to normal temperature, and the hyperthermic treatment is carried out in two stages, first stage is that heat exchanger tube is heated to 90-120 DEG C by normal temperature, second stage is, within the 5-7 second, the end of a period of heat exchanger tube constant-speed heating to hyperthermic treatment is required temperature.
2. the solid dissolving method for reducing stress corrosion and metallographic phase transformation according to claim 1, it is characterised in that the hyperthermic treatment, isothermal holding and cooling are processed and all carried out under anaerobic.
3. the solid dissolving method for reducing stress corrosion and metallographic phase transformation according to claim 2, it is characterised in that the hyperthermic treatment, isothermal holding and cooling are processed and carried out all in nitrogen environment.
4. the solid dissolving method for reducing stress corrosion and metallographic phase transformation according to claim 1, it is characterised in that before the hyperthermic treatment, isothermal holding and cooling are processed, also include oil removal treatment.
5. the solid dissolving method for reducing stress corrosion and metallographic phase transformation according to claim 1, it is characterised in that the finishing temperature of heat exchanger tube is 1065 DEG C during the hyperthermic treatment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510545227.9A CN106480301A (en) | 2015-08-31 | 2015-08-31 | The solid dissolving method of stress corrosion and metallographic phase transformation can be reduced |
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| CN201510545227.9A CN106480301A (en) | 2015-08-31 | 2015-08-31 | The solid dissolving method of stress corrosion and metallographic phase transformation can be reduced |
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| CN106480301A true CN106480301A (en) | 2017-03-08 |
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| CN201510545227.9A Pending CN106480301A (en) | 2015-08-31 | 2015-08-31 | The solid dissolving method of stress corrosion and metallographic phase transformation can be reduced |
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Application publication date: 20170308 |