CN102794574A - Welding process for martensite heat resistant steel - Google Patents
Welding process for martensite heat resistant steel Download PDFInfo
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- CN102794574A CN102794574A CN2012102546177A CN201210254617A CN102794574A CN 102794574 A CN102794574 A CN 102794574A CN 2012102546177 A CN2012102546177 A CN 2012102546177A CN 201210254617 A CN201210254617 A CN 201210254617A CN 102794574 A CN102794574 A CN 102794574A
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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
-
- 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
-
- 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
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
- B23K9/29—Supporting devices adapted for making use of shielding means
- B23K9/291—Supporting devices adapted for making use of shielding means the shielding means being a gas
- B23K9/293—Supporting devices adapted for making use of shielding means the shielding means being a gas using consumable electrode-rod
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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
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Abstract
The invention relates to a welding process, and in particular relates to a welding process for martensite heat resistant steel. The welding process comprises the following steps: selecting welding rods of AWSA5.5E9015-B9 levels, and adopting a pre-heating temperature of 150-250 DEG C, an interlayer temperature of 200-350 DEG C, welding current of 120-220A, voltage of 15-25V, and welding speed of 8-24 cm/min, wherein in the whole welding process, the temperature is kept between 150 DEG C and 350 DEG C; the width of each welding seam is controlled to be 8-20 mm; the thickness of the welding seam on each layer is controlled to be 2-4 mm; cooling the welding rods to 90-150 DEG C after welding, and carrying out heat preservation for one hour; and performing post-weld heat treatment after completely changing the super-cooled austenite. The welding process provided by the invention is unique, ensures that the welding seam performance of martensite heat resistant steel ZGZG1Cr10MoVNbN materials can satisfy the performance requirements of base materials, and especially ensures that the plasticity index elongation of the welding seams reaches the standard the same as that of the base materials.
Description
Technical field
The present invention relates to a kind of welding procedure, especially relate to a kind of martensite heat-resistant steel welding technology.
Background technology
Fired power generating unit develops towards the big capacity direction of high parameter at present, and vapor (steam) temperature and pressure further improve, and have developed some novel martensite heat resisting steel and austenitic heat-resistance steels for this reason.The alloying element content of these steel boiler steel than before is higher, and welding performance descends by contrast to some extent.The highest vapor (steam) temperature has surpassed 600 ℃, and steam pressure surpasses 25MPa, but also in continuous rising, but this depends on the development of heat resisting steel.It is that NF616, E911, T/P122 are HCM12A etc. that the novel martensite heat resisting steel that is applied to super critical boiler at present has T/P91, T/P92, and wherein most materials rely on and import, and domestic weldability and property of welded joint research to this type material is still few.Because the fast development of supercritical unit, the further lifting of supercritical unit parameter receives the restriction of material, though the production that present ZG1Cr10MoVNbN inner casing foundry goods can domesticize, the manufactory that produces the ZG1Cr10MoVNbN inner casing is also few.
Indexs such as intensity, impact flexibility all can satisfy the requirement of mother metal during the qualification of welding procedure of ZG1Cr10MoVNbN material; Hardness requirement to this type of material weld seam among the industry standard DL/T868-2004 of State Grid " qualification of welding procedure rules " is: weld seam and heat affected area hardness are not less than 90% of mother metal hardness number; Be not higher than mother metal ball hardness number+100HB, and hardness is less than 350HB.But present welding procedure can't reach standard-required.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, provide a kind of process unique, guarantee that martensite heat resisting cast steel ZGZG1Cr10MoVNbN material Weld Performance satisfies the performance requirement of mother metal, the plasticity index percentage elongation that especially can guarantee weld seam also can reach and a kind of martensite heat-resistant steel welding technology of mother metal same standard.
In order to realize goal of the invention, the present invention realizes through following mode:
A kind of martensite heat-resistant steel welding technology is characterized in that: this welding procedure is that to select the diameter of AWS A5.5 E9015-B9 grade for use be the welding rod of 4.0mm or 5.0mm, welding current 120-220A; Voltage 15-25V adopts 150 ~ 250 ℃ preheat temperature, 200-350 ℃ of interlayer temperature; Speed of welding 8-20cm/min., temperature remains between 150-350 ℃ in the whole welding process, and the per pass weld width is controlled at 8-20mm; The THICKNESS CONTROL 2-4mm of every layer of weld seam; When being cooled to 90-150 ℃ after welding is accomplished, be incubated 1 hour, overcooling austenite is changed carry out post weld heat treatment again after complete;
Said post weld heat treatment technology is tempering, is to be heated to 710-760 ℃ and to be incubated with 40 ℃/h～70 ℃/programming rate of h, is incubated 6-12 hour, the air cooling of coming out of the stove after slowly cooling to 200 ℃ with the cooling velocity of 30～50 ℃/h then;
Said post weld heat treatment technology is normalizing; It is programming rate with 50～100 ℃/h; Be heated to 1030-1055 ℃; Be incubated that air cooling is to room temperature after 8 hours, tempering is heated to 720-770 ℃ with the programming rate of 40～70 ℃/h, slowly cools to less than the air cooling of coming out of the stove after 200 ℃ with stove after temperature retention time 6-12 hour;
Said big electric current increases speed of welding when welding, and makes heat be input as 8-31kJ/cm;
The chemical composition of said wlding is: C is 0.08-0.13, Si≤0.30, and Mn≤1.2, P≤0.01, S≤0.01, Cr8.0-10.5, Mo are 0.85-1.20, and Ni is 0.45, and V is 0.15-0.30, and N is 0.02-0.07, Nb is 0.02-0.07.
The present invention has following effect:
1) process is unique: the present invention provides to such an extent that welding procedure is to select the welding rod of AWS A5.5 E9015-B9 grade for use, adopts 150 ~ 250 ℃ preheat temperature, 200-350 ℃ of interlayer temperature; Welding current 120-220A, voltage 15-25V, speed of welding 8-20cm/min.; Temperature remains between 150-350 ℃ in the whole welding process; The per pass weld width is controlled at 8-20mm, and the THICKNESS CONTROL 2-4mm of every layer of weld seam is when being cooled to 90-150 ℃ after welding is accomplished; Be incubated 1 hour, carry out post weld heat treatment again after making overcooling austenite change fully; Method provided by the invention is carried out the selection of wlding according to industry standard and standard; For the high-alloy steel material according to etc. the principle of chemical composition coupling select the wlding of AWS A5.5 E9015-B9 grade; Guarantee chemical composition and the mechanical performance and the mother metal coupling of weld metal, ZGZG1Cr10MoVNbN is a martensite type refractory steel.Welding ubiquitous problem according to bibliographical information for the martensite heat resisting steel of 9-12%Cr material is that the impact flexibility of weld metal is relatively poor and near the softening problem of mother metal weld heat-affected zone, can cause workpiece to re-use in the process and destroy.ZG1Cr10MoVNbN material of the present invention reduces the embrittlement tissue in order to make in the welding process, the main method that improves preheat temperature that adopts, and minimum preheat temperature is greater than 200 ℃; The solidification cooling of weld seam when reducing welding with this; And temperature between the road of strict control welding, following time of staying of high temperature of avoiding weld seam again long cause organizing thick, thereby influence the decline of the impact flexibility of weld seam; So temperature is less than 300 ℃ between the Control Welding Process road, and rationally controls each item welding condition.
2) guarantee chemical composition and the mechanical performance and mother metal coupling of weld seam weld metal: the present invention carries out the selection of wlding according to industry standard and standard, for the high-alloy steel material according to etc. the wlding of the chemical composition principle selection AWS A5.5 E9015-B9 grade of mating, the chemical composition of wlding is, and: C is 0.08-0.13; Si≤0.30, Mn≤1.2, P≤0.01; S≤0.01, Cr8.0-10.5, Mo are 0.85-1.20; Ni is 0.45; V is 0.15-0.30, and N is 0.02-0.07, and Nb is chemical composition and mechanical performance and the mother metal coupling that 0.02-0.07 guarantees the weld seam weld metal.
3) obtain the seam organization of excellent combination property: welding procedure design provided by the invention reaches following performance requirement: the tensile strength at weld seam position is greater than 670MPa; The yield strength at weld seam position is greater than 550MPa; The contraction percentage of area at weld seam position is greater than 35%; The percentage elongation at weld seam position is greater than 15% after the tempering post weld heat treatment, and the percentage elongation that adds weld seam position after the modified heat treatment of tempering through normalizing after the welding is greater than 18%.
4) adopt different post weld heat treatment technology to realize the optimum optimization of Weld Performance: method provided by the invention guarantees that through welding parameter reasonable in design the intensity of weld seam and tissue meet the demands.Carry out weld seam cooling velocity in the weld preheating reduction process; Reduce the tendency of hardenability of weld seam; Make weld seam remain on a rational temperature scope through temperature between the road in each road of control welding process; Avoid the weld seam embrittlement tissue that overstand causes between the high-temperature region, the cooled and solidified speed through restriction welding current, voltage and speed of welding parameter control sweating heat input and molten bath adopts the temper bead/ annealing bead technology to control the hardness of weld seam and heat affected area; Adopt different post weld heat treatment technology to realize the optimum optimization of Weld Performance.
5) design of process provided by the invention has promoted the plasticity and toughness of weld seam to greatest extent under the prerequisite that guarantees weld strength, makes the use of material safer.The results of property of this technological design satisfies the requirement of welding evaluation standard fully, can realize producing in batches.
The specific embodiment
Embodiment one: adopt 200 ℃ of minimum preheat temperatures, 200-300 ℃ of interlayer temperature, 4.0mm welding rod, welding current 130-170A, voltage 15-25V, speed of welding 10-20cm/min..Temperature remains between 200-300 ℃ in the whole welding process, and the per pass weld width is controlled 8-20mm again, and big electric current increases speed of welding when welding, and makes the heat input be controlled at 8-31kJ/cm.The THICKNESS CONTROL 2-4mm of every layer of weld seam makes down one deck road welding bead play drawing effect to the last layer welding bead.Insulation is 1 hour when being cooled to 90-150 ℃ after welding is accomplished, and carries out post weld heat treatment again after making overcooling austenite change fully.The postwelding tempering heat treatment process: be heated to 710-760 ℃ with programming rate and be incubated less than 50 ℃/h, temperature retention time 6-12 hour, the air cooling of coming out of the stove after slowly cooling to 200 ℃ with cooling velocity then less than 40 ℃/h.
Postwelding performance test results tensile strength detected value is: 690-780MPa; The yield strength detected value is: 550-642MPa; Percentage elongation is: 15-19%; The contraction percentage of area is all greater than 50%; The weld hardness detected value is (HV10): weld seam: 235-290HV, heat affected area: 250-300HV, mother metal: 220-270HV.
Embodiment two: adopt 200 ℃ of minimum preheat temperatures; 350 ℃ of top temperature; 5.0mm welding rod, welding current 180-200A, voltage 15-25V avoids the scaling loss of the excessive alloying element that causes of welding current; Speed of welding adopts 15-20cm/min.Temperature remains between 200-250 ℃ in the whole welding process, and the per pass weld width is controlled 8-15mm again, makes the heat input be controlled at 10-25kJ/cm.The THICKNESS CONTROL 3-4mm of every layer of weld seam.Insulation is 1 hour when being cooled to 90-150 ℃ after welding is accomplished, and carries out post weld heat treatment again after making overcooling austenite change fully.The postwelding tempering heat treatment process: be heated to 710 ± 10 ℃ with programming rate and be incubated less than 50 ℃/h, temperature retention time 6-8 hour, the air cooling of coming out of the stove after slowly cooling to 200 ℃ with cooling velocity then less than 40 ℃/h.
Postwelding performance test results tensile strength detected value is: 900-920MPa; The yield strength detected value is: 800-810MPa; Percentage elongation is: 15-16%; The contraction percentage of area 59%; The weld hardness detected value is (HV10): weld seam: 255-300HV, heat affected area: 250-320HV, mother metal: 220-270HV.
Embodiment three: adopt 150 ℃ of minimum preheat temperatures; 350 ℃ of top temperature; 4.0mm welding rod, welding current 120-160A, voltage 15-25V avoids the scaling loss of the excessive alloying element that causes of welding current; Speed of welding adopts 8-20cm/min.The whole welding process temperature remains on 150-350 ℃.The postwelding quenching-and-tempering process: normalizing is with the programming rate less than 100 ℃/h; Be heated to 1030-1055 ℃; Be incubated after 8 hours air cooling to room temperature; Tempering is heated to 720-770 ℃ with the programming rate less than 50 ℃/h, and temperature retention time is greater than slowly cooling to less than the air cooling of coming out of the stove after 200 ℃ with stove after 6-12 hour.
Performance test results tensile strength detected value is: 720-780MPa; The yield strength detected value is: 560-625MPa; Percentage elongation is: 18-25%; The contraction percentage of area:>50%; The weld hardness detected value is (HV10): weld seam: 245-274HV, heat affected area: 255-289HV, mother metal: 232-260HV.
Embodiment four: adopt 150 ℃ of minimum preheat temperatures; 350 ℃ of top temperature; 5.0mm welding rod, welding current 200-220A, voltage 15-25V; Speed of welding adopts 8-20cm/min.The whole welding process temperature remains on 150-350 ℃.The postwelding quenching-and-tempering process: normalizing is with the programming rate less than 100 ℃/h; Be heated to 1030-1055 ℃; Be incubated after 8 hours air cooling to room temperature; Tempering is heated to 720-740 ℃ with the programming rate less than 50 ℃/h, and temperature retention time is greater than slowly cooling to less than the air cooling of coming out of the stove after 200 ℃ with stove after 10-12 hour.
Performance test results tensile strength detected value is: 780-870MPa; The yield strength detected value is: 676-769MPa; Percentage elongation is: 16-17%; The contraction percentage of area 53%; The weld hardness detected value is (HV10): weld seam: 255-285HV, heat affected area: 255-290HV, mother metal: 250-270HV
Above technology reaches the purpose of design invention, has satisfied the performance requirement after material welds.
The chemical composition of above-mentioned wlding is: C is 0.08-0.13, Si≤0.30, and Mn≤1.2, P≤0.01, S≤0.01, Cr8.0-10.5, Mo are 0.85-1.20, and Ni is 0.45, and V is 0.15-0.30, and N is 0.02-0.07, Nb is 0.02-0.07.
Claims (5)
1. martensite heat-resistant steel welding technology is characterized in that: this welding procedure is that to select the diameter of AWS A5.5 E9015-B9 grade for use be the welding rod of 4.0mm or 5.0mm, welding current 120-220A; Voltage 15-25V adopts 150～250 ℃ preheat temperature, 200-350 ℃ of interlayer temperature; Speed of welding 8-20cm/min., temperature remains between 150-350 ℃ in the whole welding process, and the per pass weld width is controlled at 8-20mm; The THICKNESS CONTROL 2-4mm of every layer of weld seam; When being cooled to 90-150 ℃ after welding is accomplished, be incubated 1 hour, overcooling austenite is changed carry out post weld heat treatment again after complete.
2. a kind of martensite heat-resistant steel welding technology as claimed in claim 1; It is characterized in that: said post weld heat treatment technology is tempering; Be to be heated to 710-760 ℃ and to be incubated with 40 ℃/h～70 ℃/programming rate of h; Be incubated 6-12 hour, the air cooling of coming out of the stove after slowly cooling to 200 ℃ with the cooling velocity of 30～50 ℃/h then.
3. a kind of martensite heat-resistant steel welding technology as claimed in claim 1; It is characterized in that: said post weld heat treatment technology is normalizing; Be programming rate, be heated to 1030-1055 ℃, be incubated after 8 hours air cooling to room temperature with 50～100 ℃/h; Tempering is heated to 720-770 ℃ with the programming rate of 40～70 ℃/h, slowly cools to less than the air cooling of coming out of the stove after 200 ℃ with stove after temperature retention time 6-12 hour.
4. a kind of martensite heat-resistant steel welding technology as claimed in claim 1 is characterized in that: said big electric current increases speed of welding when welding, and makes heat be input as 8-31kJ/cm.
5. a kind of martensite heat-resistant steel welding technology as claimed in claim 1, it is characterized in that: the chemical composition of said wlding is: C is 0.08-0.13, Si≤0.30; Mn≤1.2, P≤0.01, S≤0.01; Cr8.0-10.5, Mo are 0.85-1.20, and Ni is 0.45; V is 0.15-0.30, and N is 0.02-0.07, and Nb is 0.02-0.07.
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| CN2012102546177A CN102794574A (en) | 2012-07-23 | 2012-07-23 | Welding process for martensite heat resistant steel |
| PCT/CN2013/075365 WO2014015702A1 (en) | 2012-07-23 | 2013-05-09 | Welding process for martensite heat resistant steel |
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| WO2014015702A1 (en) * | 2012-07-23 | 2014-01-30 | 宁夏共享集团有限责任公司 | Welding process for martensite heat resistant steel |
| CN103643025A (en) * | 2013-12-11 | 2014-03-19 | 安徽三兴检测有限公司 | Method of improving toughness of novel martensite heat-resistant steel A355P91 welding seam |
| CN103978294A (en) * | 2014-06-11 | 2014-08-13 | 东方电气集团东方锅炉股份有限公司 | Welding technology of P92 steel submerged automatic arc welding for power station boiler |
| CN104014916A (en) * | 2014-06-06 | 2014-09-03 | 南通国电电站阀门有限公司 | F91 valve body and 10CrMo910 tubing dissimilar steel welding method |
| CN104874937A (en) * | 2015-06-15 | 2015-09-02 | 唐山师范学院 | Welding technology for bainite heat-resistant steel 12Cr2MoWVTiB |
| CN106350654A (en) * | 2015-07-17 | 2017-01-25 | 四川迪瑞机电设备有限公司 | Treatment method capable of enabling harness of steel welding joints to be uniform |
| CN106735777A (en) * | 2016-12-08 | 2017-05-31 | 苏州热工研究院有限公司 | The welding method for preventing SA335 T/P92 steel weld heat-affected zones granular ferrite from producing |
| CN108723560A (en) * | 2018-07-03 | 2018-11-02 | 华北水利水电大学 | Improve the heat treatment method of high strength weld joints low-temperature flexibility |
| CN108856964A (en) * | 2018-06-29 | 2018-11-23 | 共享铸钢有限公司 | A kind of production method preventing the irrelevant magnetic particle indications of steel-casting |
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| CN103643025A (en) * | 2013-12-11 | 2014-03-19 | 安徽三兴检测有限公司 | Method of improving toughness of novel martensite heat-resistant steel A355P91 welding seam |
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| CN108856964A (en) * | 2018-06-29 | 2018-11-23 | 共享铸钢有限公司 | A kind of production method preventing the irrelevant magnetic particle indications of steel-casting |
| CN108723560A (en) * | 2018-07-03 | 2018-11-02 | 华北水利水电大学 | Improve the heat treatment method of high strength weld joints low-temperature flexibility |
| CN108723560B (en) * | 2018-07-03 | 2021-03-19 | 华北水利水电大学 | Heat treatment method for improving low-temperature toughness of high-strength welded joint |
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| CN109794668B (en) * | 2018-11-28 | 2021-01-01 | 华电电力科学研究院有限公司 | Method for welding closure seam of martensite heat-resistant steel container |
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| CN110434503A (en) * | 2019-07-29 | 2019-11-12 | 沈阳露天采矿设备制造有限公司 | A kind of welding procedure of A743-CA6NM material |
| CN110722307B (en) * | 2019-08-30 | 2021-09-07 | 武汉船用机械有限责任公司 | Welding tool and welding method for martensite heat-resistant steel gland |
| CN112176254A (en) * | 2020-09-22 | 2021-01-05 | 宝武重工有限公司 | High-impact-toughness low-temperature steel and welding process thereof |
| CN112207469A (en) * | 2020-09-23 | 2021-01-12 | 中国化学工程第六建设有限公司 | P91 high-temperature steel pipeline welding and heat treatment process |
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| WO2014015702A1 (en) | 2014-01-30 |
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