CN105986105A - Stainless steel welding method - Google Patents
Stainless steel welding method Download PDFInfo
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- CN105986105A CN105986105A CN201510047005.4A CN201510047005A CN105986105A CN 105986105 A CN105986105 A CN 105986105A CN 201510047005 A CN201510047005 A CN 201510047005A CN 105986105 A CN105986105 A CN 105986105A
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Abstract
The invention discloses a stainless-steel welding method. The method comprises the following requirements: 1) low carbon stainless steel is employed: the mass percentage of carbon in the stainless steel is controlled below 0.03%; the stainless-steel materials contain two elements of 0.15-0.2% of Ti and 0.2-0.3% of Nb according to the mass percentage; 2) solid solution treatment after welding is carried out: solid solution treatment is characterized in that the material is heated to the temperature of 850-900 DEG C, insulation is carried out for 2-5 h, immediate cooling is performed, and then TiC and NbC are fully generated; and 3) stabilizing treatment after solid solution is carried out; the stainless steel is heated to the temperature of 900-950 DEG C, insulation is carried out for 3-4 h, chromium in the grains is also spread to the grain boundary, so that the chromium mass percentage in the grains is recovered to 17-19%. The stainless-steel welding method has the advantages that intercrystalline corrosion is difficultly generated after welding.
Description
Technical field
The invention belongs to welding procedure field, a kind of stainless steel welded method.
Background technology
Intercrystalline corrosion reason is produced time stainless steel welded, mainly produce at austenite grain boundary caused by " chromium depleted " phenomenon, during welding, workpiece is heated, carbon and chromium all can be to grain boundary decision inside austenite crystal, and generation chromium carbide causes crystal boundary to produce " chromium depleted " phenomenon on crystal boundary, when on crystal boundary, the content of chromium drops to below 13%, just lose antisepsis, under corrosive medium effect, crystal boundary can be corroded rapidly, i.e. " grain boundary corrosion ", under usual etching condition, crystal boundary activity in passivation alloy structure is little, but when it has the sensitivity of intercrystalline corrosion, intergranular activity is the biggest, i.e. there is certain potential difference between lattice grain and crystal boundary, this is mainly alloy and is being heated the most at that time, tissue changes and causes.So intercrystalline corrosion is a kind of local corrosion erosion caused by tissue electrochemical nonuniformity.In addition, when crystal boundary exists impurity, intercrystalline corrosion can the most also be caused at certain medium.Existing rustless steel is susceptible to intercrystalline corrosion through welding, thus is difficult to ensure that product quality, it is necessary to be further improved.
Summary of the invention
The deficiency existed in view of prior art, it is an object of the invention to provide a kind of stainless steel welded method, is not susceptible to intercrystalline corrosion after making welding.
The technical scheme realizing the object of the invention is as follows:
A kind of stainless steel welded method, it is characterised in that its welding procedure includes claimed below:
(1) low carbon stainless steel is used: in rustless steel, the mass percent of carbon controls below 0.03%；Stainless steel material is two kinds of elements of 0.15-0.2%Ti, 0.2-0.3%Nb containing mass percent；
(2) solution treatment after welding: solution treatment is i.e. heated to 850-900 DEG C, after insulation 2-5h, chilling immediately, fully generate TiC and NbC；
(3) solid solution rear stabilization processes: rustless steel is heated to 900 DEG C-950 DEG C, is incubated 3-4h, makes the chromium in crystal grain also be diffused into grain boundary, make the mass fraction of chromium at crystal grain return to as 17-19%.
The one stainless steel welded method carbon content of the present invention is the fewest, the probability producing chromium depleted degree and generation Cr depletion zone is the least, when being heated to 850-900 DEG C, chromium carbide is melted, chilling is to obtain single austenitic evanohm, do not produce Cr depletion zone, for titaniferous or the rustless steel of niobium, steel is heated to 900 DEG C-950 DEG C, make the carbide dissolution of chromium in steel, and the carbide of titanium not exclusively dissolves, then Slow cooling is for carbon, stabilizing element has higher affinity than chromium, can preferentially generate niobium carbide, titanium carbide, owing to obtaining stainless chrome content more than 12%, so stainless corrosion can be reduced.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, and its operating procedure is as follows:
A kind of stainless steel welded method, its welding procedure includes claimed below:
(1) low carbon stainless steel is used: in rustless steel, the mass percent of carbon controls below 0.03%；Stainless steel material is two kinds of elements of 0.15-0.2%Ti, 0.2-0.3%Nb containing mass percent；
(2) solution treatment after welding: solution treatment is i.e. heated to 850-900 DEG C, after insulation 2-5h, chilling immediately, fully generate TiC and NbC；
(3) solid solution rear stabilization processes: rustless steel is heated to 900 DEG C-950 DEG C, is incubated 3-4h, makes the chromium in crystal grain also be diffused into grain boundary, make the mass fraction of chromium at crystal grain return to as 17-19%.
The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art, all should be at the protection domain being defined in the patent claims the most on the basis of existing technology by logic minute analysis, reasoning or the available technical scheme of limited experiment.
Claims (1)
1. a stainless steel welded method, it is characterised in that its welding procedure includes claimed below:
Use low carbon stainless steel: in rustless steel, the mass percent of carbon controls below 0.03%；Stainless steel material is two kinds of elements of 0.15-0.2%Ti, 0.2-0.3%Nb containing mass percent；
(2) solution treatment after welding: solution treatment is i.e. heated to 850-900 DEG C, after insulation 2-5h, chilling immediately, fully generate TiC and NbC；
(3) solid solution rear stabilization processes: rustless steel is heated to 900 DEG C-950 DEG C, is incubated 3-4h, makes the chromium in crystal grain also be diffused into grain boundary, make the mass fraction of chromium at crystal grain return to as 17-19%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510047005.4A CN105986105A (en) | 2015-01-30 | 2015-01-30 | Stainless steel welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510047005.4A CN105986105A (en) | 2015-01-30 | 2015-01-30 | Stainless steel welding method |
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| CN105986105A true CN105986105A (en) | 2016-10-05 |
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| CN201510047005.4A Pending CN105986105A (en) | 2015-01-30 | 2015-01-30 | Stainless steel welding method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108705197A (en) * | 2018-05-03 | 2018-10-26 | 山西太钢不锈钢股份有限公司 | Chrome ferritic stainless steel welding and post-weld annealed technique in a kind of cold continuous rolling production line |
| CN110195152A (en) * | 2019-06-11 | 2019-09-03 | 河南神州精工制造股份有限公司 | A method of improving austenitic stainless steel anti intercrystalline corrosion ability |
-
2015
- 2015-01-30 CN CN201510047005.4A patent/CN105986105A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108705197A (en) * | 2018-05-03 | 2018-10-26 | 山西太钢不锈钢股份有限公司 | Chrome ferritic stainless steel welding and post-weld annealed technique in a kind of cold continuous rolling production line |
| CN108705197B (en) * | 2018-05-03 | 2020-05-01 | 山西太钢不锈钢股份有限公司 | Chromium ferrite stainless steel welding and post-welding annealing process in cold continuous rolling production line |
| CN110195152A (en) * | 2019-06-11 | 2019-09-03 | 河南神州精工制造股份有限公司 | A method of improving austenitic stainless steel anti intercrystalline corrosion ability |
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Application publication date: 20161005 |
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| WD01 | Invention patent application deemed withdrawn after publication |