CN104722900A - Welding method for hydrogen system step-cool profile steel - Google Patents
Welding method for hydrogen system step-cool profile steel Download PDFInfo
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- CN104722900A CN104722900A CN201510154589.5A CN201510154589A CN104722900A CN 104722900 A CN104722900 A CN 104722900A CN 201510154589 A CN201510154589 A CN 201510154589A CN 104722900 A CN104722900 A CN 104722900A
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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
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
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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
- B23K9/02—Seam welding; Backing means; Inserts
-
- 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
- B23K9/235—Preliminary treatment
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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
- C21D6/00—Heat treatment of ferrous alloys
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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
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- Crystallography & Structural Chemistry (AREA)
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- Heat Treatment Of Articles (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to a welding method for a hydrogen system step-cool 9/4Cr-Mo steel synthesis ammonia loop pipeline, in particular to a welding method for a synthesis ammonia device, an ammonia synthesis tower outlet and an outlet pipeline in a C.F.Braun method. The method is beneficial to specific method parameters for welding the hydrogen system step-cool 9/4Cr-Mo steel pipeline, the preheating temperature, a welding material, wire energy, thermal treatment time and the like in the welding method are adjusted, it is guaranteed that a welding joint has the excellent hydrogen corrosion resistance and tempering embrittlement resistance, occurrence of a cracking accident of a synthesis ammonia loop in the Braun method can be avoided, economic loss is reduced, the service life of the equipment pipeline is greatly prolonged, and engineering quality is safe and reliable.
Description
Technical field
The present invention relates to hydrogen system synthesis loop pipeline step cooling (Step-Cool) type
the welding method of steel, especially in particular for C.F.Braun method synthetic ammonia installation, ammonia convertor outlet and outlet line step cooling (Step-Cool) type
the welding method of steel.
Background technology
The method complicated condition of the equipment in ammonia synthesis loop or pipeline, medium have inflammable, explosive, easily poisoning, high temperature, high pressure, the features such as corrosion.
steel owing to having good corrosion resistance, in ammonia synthesis loop, particularly in C.F.Braum method synthesis ammonia system,
steel is used as the material of synthetic tower housing and synthesis gas pipeline.Due to the existence of oily hydrogen in the method medium in ammonia synthesis loop, be referred to as " hydrogen system ".Hydrogen penetrates into steel inside, runs into the chemical change that carbide causes structure of steel, and carbide decomposes and produces CH4, and steel is by decarburization and crack.In steel, phosphorus content is higher, and operating temperature and pressure are higher, and hydrogen-type corrosion is more serious.Consider from erosion-resisting angle, be applied to the steel of hydrogen system, for avoiding decarburization and occurring crackle, should limit the operating condition limit.From the analysis of the CRACKING ACCIDENT of the pipeline welding joint of the ammonia factory appearance of building up in early days, the main cause of this kind of accident or hydrogen-type corrosion, this can be proven from from slit region clear pore of seeing under higher multiple with " crow toe ", because these pores and crow toe are seen as the strong evidence of the hydrogen-type corrosion process of chemical induction usually, cause hydrogen-type corrosion primarily of the impact of the factors such as temper brittleness, welding method, heat treatment method of steel, therefore, traditional 21/4Cr-Mo steel is not long for the service life in hydrogen system.Scholars does and manyly to study widely for this reason, is studied, thinks traditional to the requirement of the effect of the trace element in steel and impurity, welding material, welding method and post weld heat treatment method and method
steel is unwell in hydrogen system to be applied, interrupted this kind of cracking, the leakage accident occurred, facilitates the improvement of this steel forcefully, therefore the improving of a kind of applicable hydrogen system condition of work
finally come out.
This novel
steel is very tight on the control of element affecting temper embrittlement parameter, especially P, and actual content only has 0.006%, and chemical composition specifies J≤120, and the VTrs (54J) in mechanical performance after the cold treatment of regulation step≤-29 DEG C, this is novel
the key property of steel, also with traditional
the main distinction point of steel.
The application is exactly in order to for hydrogen system synthesis loop pipeline
this novel material, guarantees that welding point obtains excellent resistant to hydrogen corrosivity and anti-temper embrittlement performance and provides a kind of welding method of better effects if.
Summary of the invention
The object of the invention is for hydrogen system synthesis loop pipeline
the feature of material, provides a set of new welding method.It is true that method of the present invention can obtain excellent resistant to hydrogen corrosive nature, guarantees that welding point has excellent anti-tempering catalytic performance, avoid the weld cracking in braun method synthetic ammonia loop, reduces economic loss, improves the service life of equipment pipe.
Especially, welding method of the present invention have employed and is conducive to hydrogen system pipeline new material
specific welding method, ensure the welding point obtaining excellent resistant to hydrogen corrosivity and anti-tempering catalysis.
Step cooling of the present invention
the technical scheme of the welding method of steel is as follows:
A kind of step cooling
the welding method of steel, is characterized in that, described welding method comprises the steps:
Step one, will through the heat treated welding material of step cooling
carry out double V-shaped butt weld, welding position is all positon;
Step 2, electrical heating preheating, preheat temperature >=200 DEG C;
Step 3, backing welding and second layer pass weld: adopt argon tungsten-arc welding, electric power polarity is straight polarity direct current, adopt the hybrid protection gas of 93% nitrogen and 7% hydrogen as backing gas, control line energy≤20KJ/cm in this step, control interlayer temperature simultaneously and be 200 to 250 DEG C, until backing welding and second layer welding bead are soldered, the polishing of stainless steel grinding wheel is adopted to carry out interlayer cleaning;
Step 4, filling cover welding: adopt manual electric arc welding, electric power polarity is DC reverse connection, and fill cover welding, heat input is 20KJ/cm, control interlayer temperature simultaneously and be 200 to 250 DEG C, completes until fill cover welding; The polishing of stainless steel grinding wheel is adopted to carry out interlayer cleaning; Adopt the hybrid protection gas of 93% nitrogen and 7% hydrogen as backing gas, in filling capping process, there is backing gas always;
Step 5, heat treatment: 700 DEG C ± 10 DEG C constant temperature process 5 hours, after temperature drops to 300 DEG C subsequently, air cooling is to room temperature.
Preferably, step 3 and four interlayer temperature be 220 to 240 DEG C, be more preferably 225 to 235 DEG C;
Preferably, the heat treatment temperature of step 5 is 700 DEG C ± 5 DEG C.
Above-mentioned welding method can be applied to hydrogen system synthesis loop pipeline
welding.
In the welding of step 3, to strictly eliminate the interior undercut of ground floor welding bead, lack of penetration, incomplete fusion and root gave prominence to high road weld defect (crackle occurred in ammonia convertor and outlet line shows, cracking start from inner surface inside melt run and weld defect);
Step 3 and four whole welding process in ensure preheat temperature and interlayer temperature by electrical heating method;
In the filling cover welding of step 4, the weldering of strict layering shunting, prevents oxygen in air from contacting with molten pool metal, avoids molten bath to be oxidized.
Avoid, in positive overhead position striking, preventing the generation of pore in whole welding process.
In the double V butt weld seam step of step one, be single V groove as wall thickness T≤19mm; It is double V-shaped groove during T>19mm; Bevel angle α: 35 ± 2.5 °, β 10 °; Gap b: be 2.5-3.0mm; Root face p:0.5-1.0mm; At hydrogen system synthesis loop pipeline
with hydrogen system synthesis loop pipeline
welding method in, be grouping;
Should check before weldering whether the percentage of the X parameter that welding wire manufactory provides and chemical composition Mn+Si is in region of acceptance, check the impact test curve of welding rod test plate (panel), whether the VTrs (54J) examined after " step cooling " process is less than-29 DEG C.
In step 3, adopt TIG Welding Machine, preferably adopt WS-400IGBT; Welding wire is German Unionlcrmo910 φ 2.4 welding wire, and heat input is 15-20KJ/cm; Measure interlayer temperature at any time simultaneously, interlayer temperature controls≤250 DEG C, but be not less than 200 DEG C, preheat temperature and interlayer temperature is ensured by electrical heating method in whole welding process, strictly to eliminate the interior undercut of ground floor welding bead, lack of penetration, incomplete fusion and root and give prominence to high road weld defect, until backing welding and second layer welding bead are soldered;
In step 4, welding machine is ZX7-400IGBT, welding rod is German SH chromo 2KS. φ 3.2, φ 4.0 welding rod, heat input is 15-20KJ/cm, the weldering of strict layering shunting, measures interlayer temperature simultaneously at any time, and interlayer temperature controls≤250 DEG C, but be not less than 200 DEG C, in whole welding process, ensure preheat temperature and interlayer temperature by electrical heating method.
At root layer welding bead with when filling capping, the position at 6 o'clock should be avoided in starting the arc position.
In step 5, adopt cord type and Track Type electrical heating elements to heat, preferred automatic temp. control equipment WDK6-3-1K control temperature, warming and cooling rate: 50 DEG C/h, when arriving 710 DEG C, constant temperature 5 hours, temperature drops to 300 DEG C, and air cooling is to room temperature.
The heat treated welding material of described step cooling
it can be the step cooling of φ 508 × 43mm that Cameeron company of Britain provides
steel conduit also can be process acquisition by the following method:
Step 1, to welding material
heat-treat, programming rate is 45-55 DEG C/h, is warming up to 690 DEG C ± 10 constant temp. heating process 1 hour;
Step 2, step cooling will be carried out through the heat treated heat resisting steel of step one, point following 5 steps coolings: cooling one, with the cooling of the speed of 5-7 DEG C/h, constant temperature 15 hours when being down to 540 DEG C; Cooling two, with the cooling of the speed of 5-7 DEG C/h, constant temperature 24 hours when being down to 525 DEG C; Cooling three, with the cooling of the speed of 7-9 DEG C/h, constant temperature 60 hours when being down to 495 DEG C; Cooling four, with the cooling of the speed of 2-4 DEG C/h, constant temperature 100 hours when being down to 470 DEG C; Cool five, with the cooling of the speed of 27-29 DEG C/h, after being down to 315 DEG C, air cooling is to room temperature.
Preferably, the heat treatment temperature in step 1 is 690 DEG C ± 5 DEG C;
Preferably, the programming rate in step 1 is 50 DEG C;
Preferably, the cooling one in step 2 is lowered the temperature with the speed of 6 DEG C/h;
Preferably, the cooling two in step 2 is lowered the temperature with the speed of 6 DEG C/h;
Preferably, the cooling three in step 2 is lowered the temperature with the speed of 6 DEG C/h;
Preferably, the cooling four in step 2 is lowered the temperature with the speed of 3 DEG C/h;
Preferably, the cooling five in step 2 is lowered the temperature with the speed of 28 DEG C/h.
Effect aspect: after having welded, carry out X-ray examination and mechanical test, low-temperature impact, hardness test inspection all meet code requirement: Seam and heat effected zone hardness test value is all less than 225HB, maximum Vickers hardness must not more than 240HV10, low-temperature impact test is tested in step cooling process, cold impact value >=54J at-29 DEG C.Improve anti-temper embrittlement performance and the resistant to hydrogen corrosive power of welding point.
Detailed description of the invention
Below enumerate step cooling
the welding of steel, wherein step cooling
the step cooling of φ 508 × 43mm that steel adopts Cameeron company of Britain to provide
steel conduit.
1, should by checking the X that welding wire manufactory provides before weldering
★ ★whether the percentage of parameter and chemical composition Mn+Si is in region of acceptance (Mn+Si≤1.2 and X
★ ★≤ 25PPm), check the impact test curve of welding rod test plate (panel), whether the VTrs (54J) examined after " step cooling " process is less than-29 DEG C.
2, double V butt weld seam is adopted.Bevel angle α: 35 ± 2.5 °, β 10 °; Gap b: be 2.5-3.0mm; Root face p:0.5-1.0mm, is grouping, and welding position is 6G (45 ° of fixing weldering).
3, Electric heating is adopted to heat to test specimen, temperature >=200 DEG C.
4, backing welding and second layer pass weld, adopts TIG Welding Machine, preferably adopts WS-400IGBT; Welding wire is German Unionlcrmo910 φ 2.4 welding wire, and adopt the hybrid protection gas of 93% nitrogen and 7% hydrogen as backing gas, heat input is 15-20KJ/cm; Measure interlayer temperature at any time simultaneously, interlayer temperature controls≤250 DEG C, but be not less than 200 DEG C, preheat temperature and interlayer temperature is ensured by electrical heating method in whole welding process, strictly to eliminate the interior undercut of ground floor welding bead, lack of penetration, incomplete fusion and root and give prominence to high road weld defect, until backing welding and second layer welding bead are soldered.Interlayer cleaning adopts special stainless steel grinding wheel polishing.
5, cover welding is filled, welding welding machine is ZX7-400IGBT, welding rod is German SH chromo 2KS. φ 3.2, φ 4.0 welding rod, heat input is 15-20KJ/cm, adopt the hybrid protection gas of 93% nitrogen and 7% hydrogen as backing gas, in filling capping process, there is backing gas always; The weldering of strict layering shunting, measures interlayer temperature simultaneously at any time, and interlayer temperature controls≤250 DEG C, but is not less than 200 DEG C, in whole welding process, ensure preheat temperature and interlayer temperature by electrical heating method.Interlayer cleaning adopts special stainless steel grinding wheel polishing.
6, at root layer welding bead with when filling capping, starting the arc position should in the position at 7 o'clock.
7, cord type and Track Type electrical heating elements is adopted to heat, preferred automatic temp. control equipment WDK6-3-1K control temperature, warming and cooling rate: 50 DEG C/h, when arriving 710 DEG C, constant temperature 8 hours, cannot close for internal orifice or welding point too near near equipment, heat transfer is too large, constant temperature time now more than 5 hours, should be generally 8-25 hour.
6, after having worked above, 100% dye penetrant inspection, the actinoscopy X of 100%, zero defect.Mechanical performance, hardness, impact value all meet the requirements, and joint has anti-temper embrittlement performance and the resistant to hydrogen corrosive power of good welding point, and correlation test result is as follows:
1), cold impact value:
| Gap position | Breach type | Test temperature | AKv(J) | Mean value (J) |
| Weld seam | CVN | 0℃ | 129 158 159 | 144 |
| Weld seam | CVN | -10℃ | 65 124 110 | 100 |
| Weld seam | CVN | -29℃ | 139 129 127 | 132 |
| Weld seam | CVN | -40℃ | 60 119 127 | 102 |
| Weld seam | CVN | -50℃ | 104 60 54 | 76 |
| Weld seam | CVN | -60℃ | 57 40 | 49 |
| Heat affected area | CVN | 0℃ | 27 261 251 | 180 |
| Heat affected area | CVN | -10℃ | 248 259 182 | 223 |
| Heat affected area | CVN | -29℃ | 175 245 184 | 201 |
| Heat affected area | CVN | -50℃ | 15 185 162 | 121 |
| Heat affected area | CVN | -60℃ | 181 212 174 | 162 |
2), microhardness (HV10): should at sample distance face of weld 2mm and inner surface 2mm according to code requirement
Carry out micro-hardness testing, it the results are shown in Table 2
Table 2 mixcrohardness test result
| Measuring point is numbered | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| HV10 | 164 | 164 | 177 | 177 | 172 | 191 | 193 | 187 | 169 | 157 | 168 | 157 | 157 | 164 |
| Measuring point is numbered | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| HV10 | 178 | 173 | 167 | 176 | 184 | 218 | 193 | 208 | 185 | 187 | 169 | 164 | 164 | 171 |
3), the result of the test such as welding point physics and chemistry is in table 3
In addition, described in
steel also can be adopt heat treated with the following method: start to heat-treat, programming rate 50 DEG C/h, constant temperature is started when being warmed up to 695 DEG C, constant temperature 1 hour, then lower the temperature with the speed of 6 DEG C/h, the constant temperature 15 hours when dropping to 540 DEG C, then lower the temperature with the speed of 6 DEG C/h again, constant temperature 24 hours when dropping to 525 DEG C, then lower the temperature with the speed of 6 DEG C/h again, constant temperature 60 hours when dropping to 495 DEG C, then lower the temperature with the speed of 3 DEG C/h again, constant temperature 100 hours when dropping to 470 DEG C, then lower the temperature with the speed of 28 DEG C/h again, after dropping to 315 DEG C, air cooling is to room temperature, until process terminates, should
steel welds with said method, also achieves as above similar technique effect.
Compared at present conventional by changing welding parameter, welding procedure as interlayer temperature, the weldering of layering shunting, striking position, heat treatment thermostat temperature etc. as follows, and the effect of the step cooling welding procedure of the application in welding is put into practice.
The welding method of a kind of hydrogen system step cooling shaped steel of the present invention is described by specific embodiment.Those skilled in the art can use for reference the links such as the suitable feed change of content of the present invention, method condition and realize other object corresponding, its relevant change does not all depart from content of the present invention, all similar replacements and change will become apparent to those skilled in the art that and be all deemed to be included within scope of the present invention.
Claims (10)
1. a step cooling
the welding method of steel, is characterized in that, described welding method comprises the steps:
Step one, will through the heat treated welding material of step cooling
carry out double V-shaped butt weld, welding position is all positon;
Step 2, electrical heating preheating, preheat temperature >=200 DEG C;
Step 3, backing welding and second layer pass weld: adopt argon tungsten-arc welding, electric power polarity is straight polarity direct current, adopt the hybrid protection gas of 93% nitrogen and 7% hydrogen as backing gas, control line energy≤20KJ/cm in this step, control interlayer temperature simultaneously and be 200 to 250 DEG C, until backing welding and second layer welding bead are soldered, the polishing of stainless steel grinding wheel is adopted to carry out interlayer cleaning;
Step 4, filling cover welding: adopt manual electric arc welding, electric power polarity is DC reverse connection, and fill cover welding, heat input is 20KJ/cm, control interlayer temperature simultaneously and be 200 to 250 DEG C, completes until fill cover welding; The polishing of stainless steel grinding wheel is adopted to carry out interlayer cleaning; Adopt the hybrid protection gas of 93% nitrogen and 7% hydrogen as backing gas, in filling capping process, there is backing gas always;
Step 5, heat treatment: 700 DEG C ± 10 DEG C constant temperature process 5 hours, after temperature drops to 300 DEG C subsequently, air cooling is to room temperature.
2. welding method according to claim 1, is characterized in that, described step 3 and four interlayer temperature be 220 to 240 DEG C.
3. welding method according to claim 2, is characterized in that, described step 3 and four interlayer temperature be 225 to 235 DEG C.
4. welding method according to claim 1, is characterized in that, the heat treatment temperature of described step 5 is 700 DEG C ± 5 DEG C.
5. welding method according to claim 1, is characterized in that, step 3 and four whole welding process in ensure preheat temperature and interlayer temperature by electrical heating method.
6. welding method according to claim 1, is characterized in that, in the filling cover welding of step 4, layering shunting is welded, and prevents oxygen in air from contacting with molten pool metal, avoids molten bath to be oxidized.
7. welding method according to claim 1, is characterized in that, described in
it is the step cooling of φ 508 × 43mm that Cameeron company of Britain provides
steel conduit.
8. welding method according to claim 1, is characterized in that, described in
process acquisition by the following method:
Step 1, to welding material
heat-treat, programming rate is 45-55 DEG C/h, is warming up to 690 DEG C ± 10 constant temp. heating process 1 hour;
Step 2, step cooling will be carried out through the heat treated heat resisting steel of step one, point following 5 steps coolings: cooling one, with the cooling of the speed of 5-7 DEG C/h, constant temperature 15 hours when being down to 540 DEG C; Cooling two, with the cooling of the speed of 5-7 DEG C/h, constant temperature 24 hours when being down to 525 DEG C; Cooling three, with the cooling of the speed of 5-7 DEG C/h, constant temperature 60 hours when being down to 495 DEG C; Cooling four, with the cooling of the speed of 2-4 DEG C/h, constant temperature 100 hours when being down to 470 DEG C; Cool five, with the cooling of the speed of 27-29 DEG C/h, after being down to 315 DEG C, air cooling is to room temperature.
9. welding method according to claim 8, is characterized in that, the heat treatment temperature in step 1 is 690 DEG C ± 5 DEG C.
10. welding method according to claim 8, is characterized in that, the programming rate in step 1 is 50 DEG C.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107309529A (en) * | 2016-10-21 | 2017-11-03 | 中国化学工程第六建设有限公司 | Two-way stainless steel tube welding method |
| CN106001859B (en) * | 2016-06-03 | 2018-05-22 | 江苏科技大学 | A kind of live horizontal position welding method of two phase stainless steel |
| CN112280962A (en) * | 2020-10-22 | 2021-01-29 | 燕山大学 | Steel pipe layer-by-layer cooling device and cooling method |
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2015
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| JPS53119240A (en) * | 1977-03-29 | 1978-10-18 | Nippon Steel Corp | Automatic arc welding method for high efficiency multielectrodes of low temperature high toughness steel |
| JPH02182377A (en) * | 1989-01-09 | 1990-07-17 | Kawasaki Steel Corp | Method for gas shield arc welding high-strength cr-mo steel |
| JPH0839287A (en) * | 1994-07-27 | 1996-02-13 | Kawasaki Steel Corp | Gas shielded arc welding wire for high strength cr-mo steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106001859B (en) * | 2016-06-03 | 2018-05-22 | 江苏科技大学 | A kind of live horizontal position welding method of two phase stainless steel |
| CN107309529A (en) * | 2016-10-21 | 2017-11-03 | 中国化学工程第六建设有限公司 | Two-way stainless steel tube welding method |
| CN107309529B (en) * | 2016-10-21 | 2019-08-23 | 中国化学工程第六建设有限公司 | Two-way stainless steel tube welding method |
| CN112280962A (en) * | 2020-10-22 | 2021-01-29 | 燕山大学 | Steel pipe layer-by-layer cooling device and cooling method |
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| Publication number | Publication date |
|---|---|
| CN104722900B (en) | 2017-03-01 |
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