CN107900494A - A kind of S32750 super-duplex stainless steels flat cold-rolled sheet self-melting and welding method - Google Patents
A kind of S32750 super-duplex stainless steels flat cold-rolled sheet self-melting and welding method Download PDFInfo
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- CN107900494A CN107900494A CN201711072953.9A CN201711072953A CN107900494A CN 107900494 A CN107900494 A CN 107900494A CN 201711072953 A CN201711072953 A CN 201711072953A CN 107900494 A CN107900494 A CN 107900494A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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- Plasma & Fusion (AREA)
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Abstract
The invention discloses a kind of S32750 super-duplex stainless steels flat cold-rolled sheet self-melting and welding method, and for S32750 super-duplex stainless steel flat cold-rolled sheets, thickness is 0.3 ~ 1.5mm.Using Ar+6 ~ 10%N2Mixed gas is as welding gun protective gas, using N2The TIG weld method that do not fill silk as welding backing gas; the N effusions in molten bath in welding process can effectively be suppressed; and thermal weld stress is controlled by; the austenite of Seam and heat effected zone, ferrite two-phase proportion is set to be maintained in rational scope, the corrosion resisting property and mechanical property for ensureing welding point are not less than mother metal.Method of the present invention is easy to operate, and appearance of weld is beautiful；Realize efficient, the inexpensive welding of S32750 super-duplex stainless steel flat cold-rolled sheets.
Description
Technical field
The present invention relates to a kind of S32750 super-duplex stainless steels flat cold-rolled sheet self-melting and welding method, belong to stainless-steel cold-rolling
Plate sheet welding field.
Background technology
S32750 super-duplex stainless steels due to higher Cr, Mo and N content, while in room temperature texture austenite with
Ratio of ferrite is according to about 1:1 coexists, therefore has high intensity（Its yield strength is generally twice of austenitic stainless steel）, it is good
Good resistance to Cl-Outstanding advantages of spot corrosion, anticorrosion stress-resistant and welding performance, in fields such as petrochemical industry, salt manufacturing, water conservancy project, shipbuildings
It is used widely.Compared with the super austenitic stainless steel 254SMO of same level, its resistance to spot corrosion indices P REN is suitable, exceedes
40, but the content of its Ni only has 7%, and far below the 18% of 254SMO, yield strength is about twice of 254SMO, so is ensureing to make
On the premise of the service life, material can further be thinned, economical more notable.
During soldering diphasic stainless steel, it is preferred that emphasis is ensure its two-phase proportion and avoid the occurrence of harmful phase.For that can fill
The welding method of metal, can cross the wlding of alloying to ensure the two-phase proportion of weld metal by using Ni.Meanwhile pass through
Control thermal weld stress to control the two-phase proportion of weld metal and HAZ, and avoid the precipitation of harmful phase.And for tubulation row
Industry, it would be desirable that do not filled silk from fusion welding using efficient, inexpensive.Due to S32750 super-duplex stainless steel thin plate production difficulties
Greatly, it is domestic that batch production is also not implemented, so also seldom from the research of fusion welding for it at present.The prior art is silk filling
Welding method, for S32750 super-duplex stainless steels thin plate in the application of tubulation industry and uneconomical.
The content of the invention
In order to overcome the above-mentioned problems of the prior art, the present invention provides one kind to be directed to S32750 super duplex not
The self-melting and welding method of rust steel sheet, this method is without filling silk, it is possible to suppresses the effusion of molten bath N in welding process, and passes through
Control to thermal weld stress, makes the austenite of Seam and heat effected zone, ferrite two-phase proportion be maintained in rational scope,
Ensure welding point good corrosion resisting property and mechanical property.
S32750 super-duplex stainless steels component of the present invention（Mass percent）It is as follows：
0 ＜ C≤0.030%, 0 ＜ Si≤0.80%, 0 ＜ Mn≤1.20%, 0 ＜ P≤0.035%, 0 ＜ S≤0.020%, Cr：
24.00%~26.00%, Ni：6.00%~8.00%, Mo：3.00%~5.00%, N：0.24%~0.32%, remaining is
Iron and inevitable impurity.
S32750 super-duplex stainless steels thickness of the present invention is 0.3 ~ 1.5mm.
The present invention uses following technical scheme：
A kind of S32750 super-duplex stainless steels flat cold-rolled sheet self-melting and welding method, comprises the following steps：
（1）Steel plate is cut using cold shearing processing, butt-welding fitting surface carries out degreasing and rust removal processing, until there is metal light
Pool, group do not stay gap to forming I type grooves；
（2）Welded using TIG weld method butt-welding fitting, be not filled with welding wire, welding gun protective gas is Ar+6 ~ 10%N2（Volume
Than）, gas flow is 13 ~ 14L/min；Weldment backing gas is N2, gas flow is 8 ~ 10L/min；Thermal weld stress
Control is in 100 ~ 400J/mm；Weld interpass temperature is below 50 DEG C.
（3）After the completion of welding, acid wash passivation processing is carried out to weld seam and both sides 30mm scopes, removes the oxidation of face of weld
Layer, forms passivating film.
Further, the welding method is not required to preheating and post weld heat treatment.
Further, welding gun protective gas is Ar+7-9%N2（Contain the N that volume ratio is 7-9% in argon gas2）.The present invention adopts
With Ar, N2Mixed gas is as welding gun protective gas, using N2TIG weld method as welding backing gas can be effective
Suppress the N effusions in molten bath in welding process.
Beneficial effects of the present invention：
The present invention can effectively suppress the N effusions in molten bath in welding process, and be subject to the control to thermal weld stress, make weld seam and heat
Austenite, the ferrite two-phase proportion of the zone of influence are maintained in rational scope, ensure the corrosion resisting property and mechanics of welding point
Performance is not less than mother metal.Method of the present invention is easy to operate, and appearance of weld is beautiful.
Brief description of the drawings
Fig. 1 is the weld seam metallograph of the embodiment of the present invention 1.
Fig. 2 is the HAZ metallographs of the embodiment of the present invention 1.
Embodiment
The present invention is further illustrated below by embodiment, but is not limited to following embodiments.
Embodiment 1：
By taking 1.2mm thickness S32750 super-duplex stainless steel plates as an example, the present invention is illustrated in further detail, operating procedure
It is as follows：
（1）The chemical composition of S32750 super-duplex stainless steel thin plates：
C：0.023% Si：0.55% Mn：0.95% P：0.021% S：0.001% Cr：25.23% Ni：7.04%
Mo：4.11% N：0.2547%, remaining is iron and inevitable impurity.
（2）Steel plate is cut using cold shearing processing, butt-welding fitting surface carries out degreasing and rust removal processing, until going out cash
Belong to gloss, group does not stay gap to forming I type grooves.
（3）TIG weld is carried out using the tungsten electrode butt-welding fitting of diameter 2.4mm, welding gun protective gas is Ar+8%N2, gas stream
It is N to measure as 13L/min, weldment backing gas2, gas flow 9L/min.
（4）Welding current is 150A, speed of welding 500mm/min.Thermal weld stress control 150 ~ 300J/mm it
Between.
（5）Handled using acid wash passivation, remove the oxide layer of face of weld, form passivating film.
After the completion of being welded through above-mentioned steps, Welded Joints carry out weld seam N content detection, Phase Proportion detection, mechanical property,
Pitting corrosion detects.As a result it is as follows：
1. weld seam N content is 0.2563%, mother metal N content is 0.2547%, the two is close；
2. Fig. 1 is weld seam metallographic structure photo, ferrite volume fraction 54.25%；
3. Fig. 2 is welding point HAZ metallographic structure photos, ferrite volume fraction 46.80%；
4. using ferrite instrument measurement weld metal ferrite content, three points of random measurement are respectively 45.7%, 46.7% and
49.3%, average value 47.2%；
5. welding point test specimen tensile strength is 938MPa, break in mother metal；
6. welding point is in 40 DEG C of FeCl3Average corrosion rate in+HCl solution is 2.308mmd（Mmd is the list of rate of corrosion
Position, represents mg/ (dm^2*day), how many mg is eroded for every square decimeter daily）, less than 5mmd, meet standard ASTM A923 sides
Method C is provided.
Embodiment 2：
By taking 0.8mm thickness S32750 super-duplex stainless steel plates as an example, the present invention is illustrated in further detail, operating procedure
It is as follows：
（1）The chemical composition of S32750 super-duplex stainless steel thin plates：
C：0.027% Si：0.65% Mn：0.92% P：0.025% S：0.001% Cr：25.11% Ni：7.01%
Mo：4.04% N：0.2519%, remaining is iron and inevitable impurity.
（2）Steel plate is cut using cold shearing processing, butt-welding fitting surface carries out degreasing and rust removal processing, until going out cash
Belong to gloss, group does not stay gap to forming I type grooves.
（3）TIG weld is carried out using the tungsten electrode butt-welding fitting of diameter 2.4mm, welding gun protective gas is Ar+7%N2, gas stream
Measure as 13L/min；Weldment backing gas is N2, gas flow 8L/min.
（4）Welding current is 100A, speed of welding 400mm/min.Thermal weld stress control 100 ~ 200J/mm it
Between.
（5）Handled using acid wash passivation, remove the oxide layer of face of weld, form passivating film.
After the completion of being welded through above-mentioned steps, the weld seam N content of welding point, Phase Proportion, mechanical property, pitting corrosion
Reach the effect of embodiment 1.
Claims (5)
- A kind of 1. S32750 super-duplex stainless steels flat cold-rolled sheet self-melting and welding method, it is characterised in that：Comprise the following steps：（1）S32750 super-duplex stainless steel flat cold-rolled sheets are cut using cold shearing processing, butt-welding fitting surface is removed Oily processing of rust removing, until there is metallic luster, group does not stay gap to forming I type grooves；（2）Welded using TIG weld method butt-welding fitting, be not filled with welding wire, welding gun protective gas is Ar+6 ~ 10%N2, volume Than gas flow is 13 ~ 14L/min；Weldment backing gas is N2, gas flow is 8 ~ 10L/min；Thermal weld stress control System is in 100 ~ 400J/mm；Weld interpass temperature is below 50 DEG C；（3）After the completion of welding, acid wash passivation processing is carried out to weld seam and both sides 30mm scopes, removes the oxide layer of face of weld, Form passivating film.
- 2. S32750 super-duplex stainless steels flat cold-rolled sheet self-melting and welding method according to claim 1, it is characterised in that： The mass percent of each component of S32750 super-duplex stainless steels flat cold-rolled sheet is as follows：0 ＜ C≤0.030%, 0 ＜ Si≤0.80%, 0 ＜ Mn≤1.20%, 0 ＜ P≤0.035%, 0 ＜ S≤0.020%, Cr： 24.00%~26.00%, Ni：6.00%~8.00%, Mo：3.00%~5.00%, N：0.24%~0.32%, remaining is Iron and inevitable impurity.
- 3. S32750 super-duplex stainless steels flat cold-rolled sheet self-melting and welding method according to claim 1, it is characterised in that： Welding gun protective gas is the N of Ar+7 ~ 9%2, volume ratio.
- 4. S32750 super-duplex stainless steels flat cold-rolled sheet self-melting and welding method according to claim 1, it is characterised in that： The TIG weld method is not required to preheating and post weld heat treatment.
- 5. S32750 super-duplex stainless steels flat cold-rolled sheet self-melting and welding method according to claim 1, it is characterised in that： The S32750 super-duplex stainless steels flat cold-rolled sheet thickness is 0.3 ~ 1.5mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109848522A (en) * | 2019-02-21 | 2019-06-07 | 东北电力大学 | A kind of two-phase stainless steel sheet ultrasonic wave added GTAW pulsating arc welding method |
| CN109967835A (en) * | 2019-03-21 | 2019-07-05 | 南通振华重型装备制造有限公司 | A kind of gas shielded welding progress of two phase stainless steel S32205 |
| CN111360376A (en) * | 2020-03-12 | 2020-07-03 | 江苏宜安建设有限公司 | Inert gas shielded dynamic welding without adding filler metal to pipeline |
| CN112338332A (en) * | 2020-09-28 | 2021-02-09 | 南京胜德金属装备有限公司 | Plasma welding process of S32750 super dual-phase steel |
| CN113732456A (en) * | 2021-09-16 | 2021-12-03 | 北京科技大学 | Self-fluxing welding method for 2507 super duplex stainless steel sheet |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109848522A (en) * | 2019-02-21 | 2019-06-07 | 东北电力大学 | A kind of two-phase stainless steel sheet ultrasonic wave added GTAW pulsating arc welding method |
| CN109848522B (en) * | 2019-02-21 | 2021-04-27 | 东北电力大学 | Ultrasonic-assisted GTAW (gas tungsten arc welding) pulsed arc welding method for duplex stainless steel sheet |
| CN109967835A (en) * | 2019-03-21 | 2019-07-05 | 南通振华重型装备制造有限公司 | A kind of gas shielded welding progress of two phase stainless steel S32205 |
| CN111360376A (en) * | 2020-03-12 | 2020-07-03 | 江苏宜安建设有限公司 | Inert gas shielded dynamic welding without adding filler metal to pipeline |
| CN112338332A (en) * | 2020-09-28 | 2021-02-09 | 南京胜德金属装备有限公司 | Plasma welding process of S32750 super dual-phase steel |
| CN112338332B (en) * | 2020-09-28 | 2024-03-26 | 南京胜德金属装备有限公司 | Plasma welding process of S32750 super dual-phase steel |
| CN113732456A (en) * | 2021-09-16 | 2021-12-03 | 北京科技大学 | Self-fluxing welding method for 2507 super duplex stainless steel sheet |
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Application publication date: 20180413 |