CN106868425A - A kind of post weld heat treatment method of Mn tough cut deal welding point low-temperature impact toughness high in 690MPa grades of low C of improvement - Google Patents
A kind of post weld heat treatment method of Mn tough cut deal welding point low-temperature impact toughness high in 690MPa grades of low C of improvement Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- 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
- B23K9/164—Arc welding or cutting making use of shielding gas making use of a moving fluid
-
- 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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a 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
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
The present invention discloses a kind of post weld heat treatment method of Mn tough cut deal welding point low-temperature impact toughness high in 690MPa grades of low C of improvement, is a kind of post weld heat treatment method of α+γ two-phase sections tempering, to improve the low-temperature impact toughness of cut deal welding point；Described cut deal is organized as the adverse transformation austenite of tempered martensite and small stable；Advantages of the present invention：Post weld heat treatment technique not only eliminates the thermal stress of welding generation, excludes the hydrogen embrittlement that weld seam is produced in welding process, and the uniform tissue of Seam and heat effected zone, the crystal grain of refinement Seam and heat effected zone, weld metal is preferably merged with base metals.Postwelding is excellent through the property of welded joint after α+γ two-phase section tempering heat treatments：Yield strength, tensile strength are above mother metal, elongation percentage >=20%, and melt run, coarse grain zone and 40 DEG C of fine grained region ballistic work >=47J meet Q690D grades of welding point low-temperature impact toughness requirement.Additionally, the inventive method operating process is simple, industrialized mass production is easily realized.
Description
Technical field
The invention belongs to technical field of metal material, specifically a kind of welding method is more specifically a kind of improvement
The post weld heat treatment method of Mn tough cut deal welding point low-temperature impact toughness high in 690MPa grades of low C.
Background technology
Mn tough cut deals high are mainly used in ocean platform construction in 690MPa grades of low C, and offshore platform steel is used as engineering
Structural steel plays mostly important effect in guarantee marine facility secure context.Offshore platform steel is with high intensity, height
While toughness, it is necessary to have good welding performance, this has for improving the security and service life of offshore platform steel
It is significant.
The carbon equivalent Ceq and welding cold cracking Sensitivity Index PCM computing formula provided according to CCS：
Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15 (%)
PCM=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B (%)
Understand, the carbon equivalent of Mn cut deals is higher in low C, welding cold cracking tendency is larger.Therefore, in 690MPa grades of low C
Mn tough cut deals high must carry out corresponding weld preheating and post weld heat treatment.
In addition, in welding process, the heat affected area (Heat Affected Zone, abbreviation HAZ) of weld seam both sides is subject to
Very big thermal agitation, HAZ regions have the features such as heating-up time is short, warming temperature is high, cooling velocity is fast, cause HAZ to turn into weldering
Connect joint microstructure and the maximum region of performance change gradient.In addition, it is uneven that significant physical and chemical composition is there is at melt run
Even property, and serious stress concentration.Therefore, the tissue and performance of HAZ and melt run directly affect the quality of welding point.
Although the technology of preparing of Mn tough cut deals high has reached its maturity in 690MPa grades of low C, use ratio also increases year by year
Plus, but research work of the country to its weldability is little, can be used to instruct the achievement in research of engineer applied almost not have.In view of this
One present situation, it is necessary in depth study Mn tough cut deal welding performances high in 690MPa grades of low C.
The content of the invention
The present invention is on the basis of thermal technology after existing welding and not enough for it, proposes a kind of postwelding heat of two-phase section tempering
Handling process, to improve the low-temperature impact toughness of Mn tough cut deal welding points high in 690MPa grades of low C.Concrete technical scheme
It is：
The post weld heat treatment side of Mn tough cut deal welding point low-temperature impact toughness high in a kind of 690MPa grades of low C of improvement
Method, is a kind of post weld heat treatment method of α+γ two-phase sections tempering, is welded with Mn tough cut deals high in improving 690MPa grades of low C
The low-temperature impact toughness of joint；
Mn tough cut deal chemical compositions high are by weight percentage in 690MPa grades of described low C：C:0.038~
0.07%, Mn:4.97~5.45%, Si:0.19~0.20%, S:0.0012~0.006%, P:0.004~0.009%, Al:
0.01~0.023%, Cu:0.12~0.31%, Ni:0.21~0.32%, Mo:0.16~0.23%, Cr:0.39~
0.42%, balance of Fe and other inevitable impurity；
Mn tough cut deals high are organized as tempered martensite and the reverted austenite of small stable is difficult to understand in 690MPa grades of described low C
Family name's body.
Described welding method is gas shielded arc welding；Gage of wire 1.2mm.
Technological parameter is as follows：
(1) protective gas is 80%Ar+20%CO2, 15~20L/min of shield gas flow rate；
(2) 150~200 DEG C of weld preheating temperature；
(3) multi-layer multi-pass welding process, 200~250A of welding current, 25~30V of weldingvoltage, speed of welding are used
5mm/s, 10~15KJ/cm of thermal weld stress；
(4) 150~200 DEG C of interlayer temperature；
(5) post weld heat treatment technique：630~650 DEG C of 15~30min of insulation, are air cooled to room temperature.
Mn tough cut deal thickness high 20~30mm, 720~735MPa of yield strength in 690MPa grades of described low C, resist
780~840MPa of tensile strength, elongation percentage 24.0~27.5%, -40 DEG C of 149~186J of ballistic work.
The mechanical property of the welding wire is：Yield strength >=620MPa, 700~890MPa of tensile strength, elongation percentage >=
18%, -40 DEG C of ballistic work >=47J.
Through inspection, through the middle manganese cut deal that identical preheating temperature, same weld technological parameter are welded, the tempering of postwelding two-phase section
(200 DEG C of thermal process after the welding point of Technology for Heating Processing (630~650 DEG C of 15~30min of insulation, be air cooled to room temperature) is more traditional
Insulation 120min, is air cooled to room temperature) welding point low-temperature impact toughness is higher, plasticity is more excellent, and eliminate at welding point
Hardness gradient.
Compared with thermal process after tradition, advantage of the invention is that：
Post weld heat treatment technique not only eliminates the thermal stress of welding generation, excludes the hydrogen that weld seam is produced in welding process
The crisp and uniform tissue of Seam and heat effected zone, the crystal grain of refinement Seam and heat effected zone, make weld metal with mother metal gold
Category is preferably merged.Postwelding is excellent through the property of welded joint after two-phase section tempering heat treatment：Yield strength, tensile strength are high
In mother metal, elongation percentage >=20%, melt run, coarse grain zone and -40 DEG C of fine grained region ballistic work >=47J.The welding for meeting Q690D grades connects
Head low-temperature impact toughness requirement.Additionally, the inventive method operating process is simple, industrialized mass production is easily realized.
Brief description of the drawings
Fig. 1 is 1 postwelding of embodiment, 200 DEG C of insulation 120min, is air cooled to the TEM essences of the welding heat affected zone coarse grain zone of room temperature
Thin pattern；
Fig. 2 is 2 postwelding of embodiment, 650 DEG C of insulation 15min, is air cooled to the TEM essences of the welding heat affected zone coarse grain zone of room temperature
Thin pattern；
Fig. 3 is 3 postwelding of embodiment, 630 DEG C of insulation 30min, is air cooled to the TEM essences of the welding heat affected zone coarse grain zone of room temperature
Thin pattern.
Specific embodiment
Welding base metal in the present invention in embodiment 1,2 is in Northeastern University's rolling technique and tandem rolling automation state key reality
Test the hot-rolling mills of Φ 450 that room manufactures and designs to be rolled, heating furnace is high temperature box type resistance furnace, model RX4-85-13B；It is real
The welding base metal applied in example 3 is rolled in Anshan Iron and Steel Company's Heavy Plate Plant.
Welding equipment in the present invention automates National Key Laboratory half certainly using Northeastern University's rolling technique and tandem rolling
Dynamic gas shield welding machine, model Quinto GLC403；
Welding wire in the present invention in embodiment 1,2 is CARBOFIL ER100S-G low-alloy high-strength steels reality core gas shield welding wire,
Component of weld wire is 0.08C, 1.80Mn, 0.60Si, 0.015P, 0.018S, 1.0Ni, 0.4Mo, yield strength >=620MPa, tension
700~890MPa of intensity, elongation percentage >=18%, -40 DEG C of ballistic work >=47J；Welding wire in the present invention in embodiment 3 is CHW-
100GX ER110S-G Gmaw Wire Used For Hsla Steel Weldings, component of weld wire is 0.088C, 1.75Mn, 0.51Si, 0.009P,
0.007S, 2.21Ni, 0.51Mo, 0.28Cr, 0.25Cu, yield strength 670MPa, tensile strength 830MPa, elongation percentage >=
19%, -40 DEG C of ballistic work 75J.
The heating furnace that welding point heat treatment of the present invention is used is chamber type electric resistance furnace, model RX-36-10.
The equipment that metallographic structure is observed in embodiment is Lycra DMIRM 2500M metallographic microscopes.
Embodiment 1
Thermal process (200 DEG C of insulation 120min, be air cooled to room temperature) after tradition, processing step is as follows：
(1) welding procedure
Mn tough cut deals high in 20mm thick low C are processed into symmetrical double V-shaped groove, 30 ° of bevel, root face
2mm, group is to gap 1.5mm.Plate surface to be welded to groove both sides is polished, and removes iron scale and iron filings, will be treated
Welded blank surrounding is fixed with bolt, then carries out Ar+CO2Mixed gas protected tack welding.
After tack welding terminates, using flame gun to being preheated in the range of weld seam and surrounding 200mm, preheating temperature 150~
200℃.Centering manganese cut deal is welded after preheating, welding current 200A, weldingvoltage 25V, gas flow 15L/min, weldering
Meet speed 5mm/s, weld heat input 10KJ/cm.In welding process, interlayer temperature is controlled at 150~200 DEG C.
(2) thermal process afterwards
The welded plate after weldering terminates will be filled in 200 DEG C of resistance furnaces are put into, 120min is incubated, welding stress is eliminated, and
Enable welding to introduce hydrogen atom fully to spread, it is to avoid produce hydrogen induced cracking, be then air cooled to room temperature, determine the drawing of welding point
Stretch performance, impact property and hardness number.
After testing, the yield strength of welding point is 778MPa, and tensile strength is 843MPa, yield tensile ratio 0.92, elongation percentage
15.37%, it is broken at mother metal；- 40 DEG C of each region of welding point ballistic work is respectively：Weld seam 52J, melt run 28J, coarse-grain
Area 48J, fine grained region 76J；Each zone hardness value of welding point is respectively：Weld seam 310HV, melt run 304HV, coarse grain zone 343HV,
Fine grained region 362HV, mixed crystal area 285HV, mother metal 279HV.
Embodiment 2
Post weld heat treatment technique (650 DEG C of insulation 15min, be air cooled to room temperature), processing step is as follows：
(1) welding procedure
Welding procedure is with embodiment 1, and welding process and welding condition are same as Example 1.
(2) post weld heat treatment technique
The welded plate after weldering terminates will be filled in 650 DEG C of resistance furnaces are put into, (welding steel is heated to 650 to insulation 15min
DEG C need 35min), eliminate thermal stress that welding produces, exclude the hydrogen embrittlement that weld seam is produced in welding process, while uniform weld seam with
The tissue of heat affected area, the crystal grain of refinement Seam and heat effected zone, reduce welding point hardenability, make weld metal and mother metal
Metal is preferably merged.Room temperature is then air cooled to, tensile property, impact property and the hardness number of welding point is determined.
After testing, the yield strength of welding point is 763MPa, and tensile strength is 848MPa, yield tensile ratio 0.90, elongation percentage
21.8%, it is broken at mother metal；- 40 DEG C of each region of welding point ballistic work is respectively：Weld seam 53J, melt run 72J, coarse-grain
Area 74J, fine grained region 84J, the low-temperature impact toughness in each region of welding point have reached Q690D grades of welding point low-temperature impact toughness
Requirement；Each zone hardness value of welding point is respectively：Weld seam 310HV, melt run 311HV, coarse grain zone 275HV, fine grained region
289HV, mixed crystal area 279HV, mother metal 276HV, coarse grain zone, the hardness of fine grained region and mixed crystal area and mother metal hardness remain basically stable, study carefully
Its original should, due to postwelding two-phase section tempering heat treatment, homogenize heat affected area hardness, reduce welding point cold crack quick
Perception.
Embodiment 3
Post weld heat treatment technique (630 DEG C of insulation 30min, be air cooled to room temperature), processing step is as follows：
(1) welding procedure
Mn tough cut deals high in 30mm thick low C are processed into symmetrical double V-shaped groove, 30 ° of bevel, root face
2mm, group is to gap 2mm.Plate surface to be welded to groove both sides is polished, and removes iron scale and iron filings, will be to be welded
Jointed sheet material surrounding is fixed with bolt, then carries out Ar+CO2Mixed gas protected tack welding.
After tack welding terminates, using flame gun to being preheated in the range of weld seam and surrounding 200mm, preheating temperature 150~
200℃.Centering manganese cut deal is welded after preheating, welding current 250A, weldingvoltage 30V, gas flow 20L/min, weldering
Meet speed 5mm/s, weld heat input 15KJ/cm.In welding process, interlayer temperature is controlled at 150~200 DEG C.
(2) thermal process afterwards
The welded plate after weldering terminates will be filled in 630 DEG C of resistance furnaces are put into, (welding steel is heated to 630 to insulation 30min
DEG C need 50min), welding stress is eliminated, the hydrogen embrittlement that weld seam is produced in welding process is excluded, while uniformly Seam and heat effected zone
Tissue, refinement Seam and heat effected zone crystal grain, reduce welding point hardenability, make weld metal more preferable with base metals
Ground fusion.Room temperature is then air cooled to, tensile property, impact property and the hardness number of welding point is determined.
After testing, the yield strength of welding point is 713MPa, and tensile strength is 854MPa, yield tensile ratio 0.83, elongation percentage
23.5%, it is broken at mother metal；- 40 DEG C of each region of welding point ballistic work is respectively：Weld seam 48J, melt run 70J, coarse-grain
Area 110J, fine grained region 198J, the low-temperature impact toughness in each region of welding point have reached the Q690D grades of low-temperature impact of welding point
Toughness reguirements；Each zone hardness value of welding point is respectively；Each zone hardness value of welding point is respectively：Weld seam 290HV, fusion
Line 314HV, coarse grain zone 295HV, fine grained region 304HV, mixed crystal area 293HV, mother metal 279HV.Coarse grain zone, fine grained region and mixed crystal area
Hardness remains basically stable with mother metal hardness.
During actual welding, the heat affected area (Heat Affected Zone, abbreviation HAZ) of weld seam both sides is subject to very
Big thermal agitation, HAZ regions have the features such as heating-up time is short, warming temperature is high, cooling velocity is fast, cause HAZ to turn into welding
Joint microstructure and the maximum region of performance change gradient.Therefore, the tissue and performance of HAZ directly affect the quality of welding point.
Wherein coarse grain zone often turns into the most weak link of welding heat affected performance, and the performance of coarse grain heat affect zone often decides welding
The performance of joint.
The fine patterns of TEM of the coarse grain heat affect zone of the welding point of embodiment 1 are as shown in Figure 1.As shown in Figure 1, implement
The coarse grain heat affect zone of the welding point of example 1 is organized as the lath martensite of high dislocation density, and martensite lath width is in 300-
Between 800nm.Martensite has intensity and hardness higher, but toughness is poor, belongs to hard crisp phase.When material is subject to shock loading
When, martensitic structure cannot effectively hinder the extension of crackle, thus embodiment 1 welding point low-temperature impact toughness relatively
Difference.
Embodiment 2, the fine patterns of TEM of the coarse grain heat affect zone of the welding point of embodiment 3 are respectively such as Fig. 2, Fig. 3 institute
Show.From Fig. 2,3, embodiment 2, the coarse grain heat affect zone of the welding point of embodiment 3 are organized as tempered martensite+reverted austenite
Austenite, martensite lath interfascicular is uniform-distribution with the adverse transformation austenite of strip, adverse transformation austenite width about 100-
Between 200nm.
In insulating process is tempered, C, Mn atom in martensite lath constantly spread in the austenite of reverted austenite,
C, Mn content in adverse transformation austenite is constantly raised, and stability constantly strengthens.In subsequent process air cooler, stability is stronger
This part adverse transformation austenite remain into room temperature.When by shock loading, adverse transformation austenite is changed into martensite, improves
The impact flexibility of material, effectively hinders the extension of crackle, here it is the TRIP effects that adverse transformation austenite is produced.
Claims (6)
1. in a kind of 690MPa grades of low C of improvement Mn tough cut deal welding point low-temperature impact toughness high post weld heat treatment side
Method, it is characterised in that：It is a kind of post weld heat treatment method of α+γ two-phase sections tempering, it is high-strength with Mn in improving 690MPa grades of low C
The low-temperature impact toughness of tough cut deal welding point；
Mn tough cut deal chemical compositions high are by weight percentage in 690MPa grades of described low C：C:0.038~0.07%,
Mn:4.97~5.45%, Si:0.19~0.20%, S:0.0012~0.006%, P:0.004~0.009%, Al:0.01~
0.023%, Cu:0.12~0.31%, Ni:0.21~0.32%, Mo:0.16~0.23%, Cr:0.39~0.42%, surplus
It is Fe and other inevitable impurity；
Mn tough cut deals high are organized as the reverted austenite Ovshinsky of tempered martensite and small stable in 690MPa grades of described low C
Body.
2. post weld heat treatment method according to claim 1, it is characterised in that：Described welding method is gas shield
Weldering.
3. post weld heat treatment method according to claim 1, it is characterised in that technological parameter is as follows：
(1) protective gas is 80%Ar+20%CO2, 15~20L/min of shield gas flow rate；
(2) 150~200 DEG C of weld preheating temperature；
(3) multi-layer multi-pass welding process is used, 200~250A of welding current, 25~30V of weldingvoltage, speed of welding 5mm/s,
10~15KJ/cm of thermal weld stress；
(4) 150~200 DEG C of interlayer temperature；
(5) post weld heat treatment technique：630~650 DEG C of 15~30min of insulation, are air cooled to room temperature.
4. post weld heat treatment method according to claim 2, it is characterised in that：Gage of wire 1.2mm.
5. post weld heat treatment method according to claim 1, it is characterised in that：Mn is high-strength in 690MPa grades of described low C
Tough cut deal thickness 20~30mm, 720~735MPa of yield strength, 780~840MPa of tensile strength, elongation percentage 24.0~
27.5%, -40 DEG C of 149~186J of ballistic work.
6. post weld heat treatment method according to claim 4, it is characterised in that：The mechanical property of the welding wire is：Surrender
Intensity >=620MPa, 700~890MPa of tensile strength, elongation percentage >=18%, -40 DEG C of ballistic work >=47J.
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|---|---|---|---|---|
| CN107511566A (en) * | 2017-10-24 | 2017-12-26 | 徐州市华圆机械厂 | A kind of welding method for being heat-treated destressing |
| CN108356417A (en) * | 2018-02-07 | 2018-08-03 | 钢铁研究总院 | A kind of heat treatment method improving high strength and ductility medium managese steel laser weld joint plasticity |
| CN109161791A (en) * | 2018-08-29 | 2019-01-08 | 宝山钢铁股份有限公司 | 690MPa rank ship and Marine Engineering Steel and its manufacturing method with superior low-temperature toughness |
| CN110527793A (en) * | 2019-09-06 | 2019-12-03 | 武汉科技大学 | A kind of heat treatment method improving low chromium type stainless steel welded joint low-temperature flexibility |
| CN110814568A (en) * | 2019-10-21 | 2020-02-21 | 东北大学 | High-toughness medium manganese steel gas shielded welding wire |
| CN111515530A (en) * | 2020-05-19 | 2020-08-11 | 上海工程技术大学 | Laser wire feeding welding method for aluminum-silicon coating hot forming steel |
| US20210054953A1 (en) * | 2019-08-20 | 2021-02-25 | KLINGER Kempchen GmbH | Flange connection having a weld ring gasket |
| CN115283787A (en) * | 2022-09-05 | 2022-11-04 | 中国石油化工股份有限公司 | Welding process of steel for high-pressure hydrogen storage |
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| CN104805378A (en) * | 2015-05-13 | 2015-07-29 | 东北大学 | High strength and toughness ultra-low carbon medium manganese steel middle-thickness plate and preparation method thereof |
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| CN115283787A (en) * | 2022-09-05 | 2022-11-04 | 中国石油化工股份有限公司 | Welding process of steel for high-pressure hydrogen storage |
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