CN101722382A - High-strength welding wires of gas shielded welding needing thermal refining after welding - Google Patents
High-strength welding wires of gas shielded welding needing thermal refining after welding Download PDFInfo
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- CN101722382A CN101722382A CN200810201556A CN200810201556A CN101722382A CN 101722382 A CN101722382 A CN 101722382A CN 200810201556 A CN200810201556 A CN 200810201556A CN 200810201556 A CN200810201556 A CN 200810201556A CN 101722382 A CN101722382 A CN 101722382A
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Abstract
The invention relates to welding wires, in particular to high-strength welding wires needing hardening and tempering after welding, comprising the following chemical components by weight percent: 0.03-0.12 wt% of C, 0.30-0.80 wt% of Si, 1.2-2.2 wt% of Mn, 1.0-2.0 wt% of Ni, 0.05-0.30 wt% of Cu, 0.10-0.50 wt% of Cr, 0.20-0.80 wt% of Mo, 0.03-0.20 wt% of Ti, equal to or less than 0.015 wt% of S, less than or equal to 0.020 wt% of P, and the balance Fe and inevitable impurity elements. As for the welding wires after rich Ar gas shielded welding, under the thermal refining state, the mechanical property of the obtained welded metal is follows: yield strength ReL is equal to or greater than 630MPa, tensile strength Rm is equal to or greater than 780MPa, elongation A is equal to or greater than 20%, and absorbed energy Akv is equal to or greater than 60J under the temperature of -40 DEG C. The welded metal of the welding wires has high strength, good low-temperature toughness and favorable welding technological property after hardening and tempering.
Description
Technical field
The present invention relates to a kind of welding wire, especially postwelding needs the high strength welding wire of modifier treatment.
Background technology
At present, above high-strength steel sheet and some high-strength foundry goods, the forging of Yield strength 700 MPa has been widely used in fields such as engineering machinery, mining machinery, port and pier machinery.The welding of this high-strength steel is produced can divide the two class situations of work usually, and a kind of situation is earlier steel grade to be carried out modifier treatment, then welds, and promptly postwelding no longer needs heat treatment; Another kind of situation is earlier steel grade to be welded, and then carries out whole modifier treatment again.Existing postwelding heat treated high-strength steel welding material of needs and welding method thereof are as follows:
Chinese patent CN1120479 discloses a kind of high strength and toughness welding wire, it mainly is applicable to MAG method welding gas cylinder, the chemical composition prescription of welding wire is as follows: C:0.03～0.1%, Si:0.20～0.50%, Mn:1.0～1.6%, Ni:2.8～3.5%, Cr:0.80～1.40%, Mo:0.40～0.65%, V:0.002～0.08%, Ti:0.002～0.05%, S :≤0.008%, P≤0.008%, O :≤0.005%, N≤0.005%, wherein V+Ti (weight)≤0.10%.The combination property of its deposited metal can reach: tensile strength is 750～850MPa, and yield strength is not less than 670MPa, and percentage elongation is not less than 15% ,-50 ℃ A
KvBe not less than 70J.This welding wire contains the V microalloy element, and it adopts the composite refining effect of V+Ti, is the key that final weld seam can obtain high-intensity high-tenacity.
Japan Patent JP59004993A discloses " WELDING METHOD OFTEMPERED TYPE STEEL PIPE " (welding method of tempering shape steel tube), the welding wire of this patent disclosure is a kind of welding wire for submerged-arc welding, solder flux coupling with specific basicity, after the submerged arc welding, thereby obtain to have the welded tube of good obdurability after the tempering.Welded tube is heated to 900-1100 ℃ earlier and quenches, and then tempering process is: temperature 600-700 ℃ of temperature retention time is not less than 5 minutes, and welded tube gained weld metal has good low-temperature flexibility, ductile-brittle transition temperature≤-50 ℃.The tensile strength of the weld metal under the normal temperature is not less than 500MPa.The chemical composition of the welding wire for submerged-arc welding of welded still pipe consists of: C:0.05～0.15%, Si :≤0.1%, Mn:1.0-2.0%, Ni:3.0-9.0%, Cu :≤1.0%, P≤0.015%, S≤0.010%, clout are iron and unavoidable impurities, and flux basicity answers 〉=1.5, especially working as its basicity value is 1.5～2.5, and effect is better.This method postwelding need carry out modifier treatment, but the tensile strength of weld metal only is the 500MPa level, does not belong to Materials with High Strength, and it is a kind of welding wire for submerged-arc welding, and the acquisition of its mechanical property need be complementary with specific solder flux.
Japan Patent JP 58138589A discloses " Welding 3.5 per cent nickel steel-involves using high nickel content steel welding wire followed by heattreatment " (adopt the welding wire of high nickel content and carry out subsequent heat treatment welding 3.5%Ni steel).The chemical composition of this welding wire consists of: C 0.02-0.08%, and Si 0.15-0.30%, Mn0.30-1.00%, Ni 8.0-11.0%, clout are iron and unavoidable impurities.This steel adopts two-sided single-run welding or single face two pass soldering method.Welding portion is through a post weld heat treatment that is higher than 550 ℃ then.This welding 3.5%Ni steel is applied to the chemical plant or is used for the storage of liquid gas, C, and Si, the Mn element has improved the hardenability characteristic of welding assembly.The Ni element has been guaranteed the reasonable Ni content of weld metal.Technology for Heating Processing has further improved the low-temperature flexibility of welding assembly.This patent postwelding does not need to carry out modifier treatment, and the disclosed welding wire of this patent is the special welding wire of welding 3.5%Ni steel, belongs to a kind of high Ni welding wire (Ni 8.0-11.0%), is mainly used in the manufacturing low-temperature (low temperature) vessel.
Summary of the invention
The object of the present invention is to provide a kind of postwelding to need the high-strength gas welding protection wire of modifier treatment, this welding wire can welded high-strength low-alloy structural steel and high strength casting, forging, welding back intensity height, and low-temperature flexibility is good.
The present invention is achieved in that a kind of postwelding needs the high-strength gas welding protection wire of modifier treatment, is characterized in that the welding wire chemical composition is (wt%): C:0.03～0.12; Si:0.30～0.80; Mn:1.2～2.2, Ni:1.0～2.0, Cu:0.05～0.30; Cr:0.10～0.50; Mo:0.20～0.80, Ti:0.03～0.20, S :≤0.015; P :≤0.020, surplus is Fe and unavoidable impurities element.
Described welding wire is at argon-rich gas shielded postwelding, and the mechanical property of gained deposited metal is under the quenched and tempered state: yield strength ReL 〉=630MPa, tensile strength Rm 〉=780MPa, percentage elongation A 〉=20%, the impact absorbing energy A in the time of-40 ℃
Kv〉=60J.
Therefore welding wire of the present invention needs certain alloying component owing to need the postwelding modifier treatment, will guarantee good low-temperature impact toughness, solderability and economy simultaneously, and alloying component should be simple as far as possible.Its alloy is C-Si-Mn-Ni-Cr-Mo-Ti, and it improves the intensity and the low-temperature flexibility of deposited metal by means such as solution strengthening, precipitation strength, refined crystalline strengthenings.The qualification of concrete chemical composition be the reasons are as follows:
C: to improving intensity very big contribution being arranged, is the most cheap alloy strengthening element.Carbon is the indispensable element that austenite is transformed into hardening constituents such as martensite, bainite, but the carbon content increase can make its percentage elongation reduce, plasticity, low-temperature flexibility, and cold deformation ability variation, the drawing property of this butt welding wire rod is unfavorable.The scope of the selection of C of the present invention is 0.03～0.12%.
Si: be deoxidant element, certain solution strengthening effect is arranged in steel, can influence the toughness of steel but content is too high, and make the welding performance variation, reasonable range is 0.30～0.80%.
Mn: as the essential element of strengthen welds metal strength, it also is the effective element that improves the quenching degree of steel, can partly replace Mo to reduce the cost of alloy of steel.If but the manganese too high levels can cause the toughness and the weldability variation of steel, is 1.2～2.2% so limit the scope of manganese.
Ni: promote that austenite changes to acicular ferrite, reduce austenite simultaneously, suppress the formation of eutectoid ferrite to ferritic phase transition temperature.Along with the raising of Ni content in the weld metal, the low-temperature flexibility of weld metal tends towards stability; But because Ni is a kind of relatively more expensive alloying element, for reducing the cost of alloy of steel, the scope that the present invention limits nickel is 1.0～2.0%.
Cu: a certain amount of copper content can effectively prevent the generation of hydrogen embrittlement, and this point is very much important for high-strength welding wire steel.Owing to contain 1% Ni content at least in the welding wire of the present invention, therefore add the reduction that a little copper can not cause low-temperature flexibility, can also gain in strength to a certain extent simultaneously.To limit the scope of copper be 0.05～0.30% in the present invention based on these factors.
Cr: chromium is one of intensified element important in the steel, and C curve is moved to right.Chromium and manganese cooperate, and can effectively improve the hardenability of steel, and its segregation tendency is little than manganese, increase steel plate quenching degree element so also can partly substitute molybdenum.If but too high levels can reduce steel plate toughness, increase welding crack sensibility, its zone of reasonableness is 0.10-0.50%.
Mo: effectively increase the quenching degree and the hardenability of steel, obtain evenly tiny martensite, ferrite bainite tissue after steel is quenched, can significantly improve the intensity and the toughness of steel.The scope that the present invention limits molybdenum is 0.20～0.80%.
Ti: strong carboritride forming element, but their tiny precipitated phase thinning microstructure, the intensity and the toughness of raising steel.By this tiny precipitated phase, can hinder growing up of steel plate quenching when heating austenite crystal, thereby obtain the more tiny axle quenching structure that waits, impel obtain martensite-bainite organize more tiny, thereby can obtain good low-temperature impact toughness.In addition, titanium mainly plays deoxidation, denitrification in weld metal.In the molten bath, combine generation TiO, when solid-state phase changes, provide the forming core basis for AF with O2.But more Ti can reduce the percentage elongation of steel plate, so its content is limited to 0.03-0.20%.
P, S: impurity content is low more, and steel is just pure more, and toughness can be good more.The factor of comprehensive steel-making cost is controlled at P≤0.020% respectively, S≤0.015%.
The present invention has following beneficial effect: welding wire of the present invention welds and after modifier treatment, deposited metal has good mechanical performance, especially good low-temperature flexibility; Owing to contain a certain amount of copper in the component of weld wire of the present invention, have good anti-hydrogen embrittlement ability.Welding wire of the present invention can be used for the gas shield welding of low-alloy structural steel that tensile strength is 800MPa or high strength casting, forging, belongs to and waits strong coupling, the especially suitable situation of welding assembly when the modifier treatment of postwelding needs; Also can be used for the welding of the low-alloy structural steel of 900MPa and 1000MPa or high strength casting, forging, belong to low strong coupling.
The specific embodiment
The chemical composition scope of welding wire according to the present invention is with the 300t converter smelting, be rolled into
Wire rod, carry out again roughly pulling out, intermediate annealing processing, finishing drawing technology and copper-plating technique, finally generate
Welding wire, the chemical composition of welding wire sees Table 1.
Test piece for welding adopts the railway forging hook tail frame, and the trade mark of steel is 25MnCrNiMoA, and thickness of slab 20mm, groove type are 60 ° of single face V-type butt joints, gap, bottom surface 12mm.Adopt argon-rich gas shielded weldering, gas ratio: Ar80%+CO
220%, weld preheating, preheat temperature and interlayer temperature are controlled at about 300 ℃, and sweating heat is imported about 18kJ/cm.Postwelding carries out modifier treatment to test specimen: be heated to 900 ℃ of insulations 30 minutes, and shrend, after the quenching, 60 minutes tempering process of 580 ℃ of insulations, air cooling are carried out in butt joint.Cut the tensile sample and the impact test of deposited metal in this test piece for welding, carry out performance test, result of the test sees Table 2.
The finished product chemical composition (wt%) of table 1 embodiment welding wire
| Numbering | ??C | ??Si | ??Mn | ??Ni | ??Cu | ??Cr | ??Mo | ??Ti | ??S | ??P |
| ??1 | ??0.10 | ??0.30 | ??2.2 | ??1.8 | ??0.20 | ??0.20 | ??0.20 | ??0.03 | ??0.003 | ??0.011 |
| ??2 | ??0.03 | ??0.40 | ??1.8 | ??1.5 | ??0.15 | ??0.10 | ??0.38 | ??0.10 | ??0.002 | ??0.013 |
| ??3 | ??0.12 | ??0.50 | ??1.6 | ??1.3 | ??0.10 | ??0.40 | ??0.45 | ??0.06 | ??0.005 | ??0.005 |
| ??4 | ??0.06 | ??0.60 | ??1.4 | ??1.0 | ??0.05 | ??0.50 | ??0.65 | ??0.20 | ??0.010 | ??0.015 |
| ??5 | ??0.08 | ??0.80 | ??1.2 | ??2.0 | ??0.30 | ??0.30 | ??0.80 | ??0.16 | ??0.015 | ??0.020 |
The mechanical property of table 2 embodiment welding wire deposited metal
A in the table 2
Kv *Be the impact numerical value mean value of five deposited sample CVN tests (Charpy V test).By table 2 as seen, welding wire of the present invention is at argon-rich gas shielded postwelding, and the mechanical property of gained deposited metal is under the quenched and tempered state: yield strength ReL 〉=630MPa, tensile strength Rm 〉=780MPa, percentage elongation A 〉=20%, the impact absorbing energy A in the time of-40 ℃
Kv〉=60J.
Welding, the especially postwelding of the low-alloy structural steel of the suitable tensile strength 800MPa of welding wire of the present invention or high strength casting, forging need the steel grade of modifier treatment.Main application fields has: the welding production and the manufacturing of important structure such as the forging hook tail frame on the rolling stock, engineering machinery, handling equipment, heavy-duty vehicle, mining machinery.
Claims (2)
1. the high-strength gas welding protection wire of postwelding need modifier treatment is characterized in that the welding wire chemical composition is (wt%): C:0.03～0.12; Si:0.30～0.80; Mn:1.2～2.2, Ni:1.0～2.0, Cu:0.05～0.30; Cr:0.10～0.50; Mo:0.20～0.80, Ti:0.03～0.20, S :≤0.015; P :≤0.020, surplus is Fe and unavoidable impurities element.
2. postwelding as claimed in claim 1 needs the high-strength gas welding protection wire of modifier treatment; it is characterized in that; described welding wire is at argon-rich gas shielded postwelding; the mechanical property of gained deposited metal is under the quenched and tempered state: yield strength ReL 〉=630MPa; tensile strength Rm 〉=780MPa; percentage elongation A 〉=20%, the impact absorbing energy A in the time of-40 ℃
Kv〉=60J.
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| CN200810201556A CN101722382A (en) | 2008-10-22 | 2008-10-22 | High-strength welding wires of gas shielded welding needing thermal refining after welding |
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| CN200810201556A CN101722382A (en) | 2008-10-22 | 2008-10-22 | High-strength welding wires of gas shielded welding needing thermal refining after welding |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101905391A (en) * | 2010-08-26 | 2010-12-08 | 宜昌猴王焊丝有限公司 | Submerged arc welding wire of high tensile pipeline steel |
| CN102294554A (en) * | 2010-06-22 | 2011-12-28 | 宝山钢铁股份有限公司 | 80kg grade gas shielded welding wire with high impact property at 40 DEG C below zero and wire rod |
| CN102615450A (en) * | 2012-04-17 | 2012-08-01 | 武汉科技大学 | Solid welding wire for super martensitic stainless steel and preparation method thereof |
| CN102756219A (en) * | 2011-04-25 | 2012-10-31 | 宝山钢铁股份有限公司 | Welding wire and wire rod as well as application thereof |
| CN103056550A (en) * | 2012-12-25 | 2013-04-24 | 中国船舶重工集团公司第七二五研究所 | Gas shielded welding solder wire with 900-MPa yield strength |
| CN103111772A (en) * | 2013-02-25 | 2013-05-22 | 江苏省沙钢钢铁研究院有限公司 | Weather-resistance steel gas-protection welding wire with excellent toughness under low temperature |
| CN103143857A (en) * | 2013-04-01 | 2013-06-12 | 武汉科技大学 | Copper-containing high-intensity high-toughness submerged arc welding wire and welding process thereof |
| CN103331530A (en) * | 2013-06-14 | 2013-10-02 | 武汉钢铁(集团)公司 | High-plasticity pure-argon-gas shielded welding wire with Rm (tensile strength) larger than or equal to 1100 MPa and using method of high-plasticity pure-argon-gas shielded welding wire |
| CN104148783A (en) * | 2014-07-31 | 2014-11-19 | 南京力源锻造有限公司 | Forged coupler yoke manufacturing method |
| US20160346877A1 (en) * | 2014-11-27 | 2016-12-01 | Baoshan Iron & Steel Co., Ltd. | Superhigh strength gas shielded welding wire and method for manufacturing the same |
| CN107984112A (en) * | 2016-10-26 | 2018-05-04 | 宝山钢铁股份有限公司 | A kind of high-strength submerged-arc welding wire with good low-temperature toughness |
| CN108788518A (en) * | 2018-07-26 | 2018-11-13 | 钢铁研究总院 | Antidetonation is anti-corrosion fire-resistive construction structural steel grade gas shielded welding wires of 690MPa |
| CN109604863A (en) * | 2019-01-14 | 2019-04-12 | 上海连山金属材料有限公司 | A kind of high tough gas protecting welding wire |
| CN109664047A (en) * | 2018-09-17 | 2019-04-23 | 昆山中冶宝钢焊接材料有限公司 | A kind of welding wire for the protection weldering of not preheating gas |
| CN112247399A (en) * | 2020-11-19 | 2021-01-22 | 天津大桥焊丝有限公司 | 700 MPa-level annealing-free drawing high-strength steel gas protection solid welding wire |
| CN112453662A (en) * | 2020-12-03 | 2021-03-09 | 南京钢铁股份有限公司 | Submerged-arc welding process suitable for 1000 MPa-grade high-strength steel |
-
2008
- 2008-10-22 CN CN200810201556A patent/CN101722382A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102294554A (en) * | 2010-06-22 | 2011-12-28 | 宝山钢铁股份有限公司 | 80kg grade gas shielded welding wire with high impact property at 40 DEG C below zero and wire rod |
| CN101905391A (en) * | 2010-08-26 | 2010-12-08 | 宜昌猴王焊丝有限公司 | Submerged arc welding wire of high tensile pipeline steel |
| CN101905391B (en) * | 2010-08-26 | 2013-01-09 | 宜昌猴王焊丝有限公司 | Submerged arc welding wire of high tensile pipeline steel |
| CN102756219B (en) * | 2011-04-25 | 2018-09-04 | 宝山钢铁股份有限公司 | A kind of welding wire, wire rod and its application |
| CN102756219A (en) * | 2011-04-25 | 2012-10-31 | 宝山钢铁股份有限公司 | Welding wire and wire rod as well as application thereof |
| CN102615450B (en) * | 2012-04-17 | 2014-05-21 | 武汉科技大学 | Solid welding wire for super martensitic stainless steel and preparation method thereof |
| CN102615450A (en) * | 2012-04-17 | 2012-08-01 | 武汉科技大学 | Solid welding wire for super martensitic stainless steel and preparation method thereof |
| CN103056550A (en) * | 2012-12-25 | 2013-04-24 | 中国船舶重工集团公司第七二五研究所 | Gas shielded welding solder wire with 900-MPa yield strength |
| CN103111772A (en) * | 2013-02-25 | 2013-05-22 | 江苏省沙钢钢铁研究院有限公司 | Weather-resistance steel gas-protection welding wire with excellent toughness under low temperature |
| CN103143857A (en) * | 2013-04-01 | 2013-06-12 | 武汉科技大学 | Copper-containing high-intensity high-toughness submerged arc welding wire and welding process thereof |
| CN103143857B (en) * | 2013-04-01 | 2014-12-17 | 武汉科技大学 | Copper-containing high-intensity high-toughness submerged arc welding wire and welding process thereof |
| CN103331530A (en) * | 2013-06-14 | 2013-10-02 | 武汉钢铁(集团)公司 | High-plasticity pure-argon-gas shielded welding wire with Rm (tensile strength) larger than or equal to 1100 MPa and using method of high-plasticity pure-argon-gas shielded welding wire |
| CN103331530B (en) * | 2013-06-14 | 2016-05-18 | 武汉钢铁(集团)公司 | A kind of RmHigh-ductility pure argon shield welding wire and the using method thereof of >=1100MPa |
| CN104148783A (en) * | 2014-07-31 | 2014-11-19 | 南京力源锻造有限公司 | Forged coupler yoke manufacturing method |
| CN104148783B (en) * | 2014-07-31 | 2016-06-15 | 南京力源轨道交通装备有限公司 | The manufacture method of forging hook tail frame |
| US20160346877A1 (en) * | 2014-11-27 | 2016-12-01 | Baoshan Iron & Steel Co., Ltd. | Superhigh strength gas shielded welding wire and method for manufacturing the same |
| CN107984112A (en) * | 2016-10-26 | 2018-05-04 | 宝山钢铁股份有限公司 | A kind of high-strength submerged-arc welding wire with good low-temperature toughness |
| CN108788518A (en) * | 2018-07-26 | 2018-11-13 | 钢铁研究总院 | Antidetonation is anti-corrosion fire-resistive construction structural steel grade gas shielded welding wires of 690MPa |
| CN109664047A (en) * | 2018-09-17 | 2019-04-23 | 昆山中冶宝钢焊接材料有限公司 | A kind of welding wire for the protection weldering of not preheating gas |
| CN109604863A (en) * | 2019-01-14 | 2019-04-12 | 上海连山金属材料有限公司 | A kind of high tough gas protecting welding wire |
| CN112247399A (en) * | 2020-11-19 | 2021-01-22 | 天津大桥焊丝有限公司 | 700 MPa-level annealing-free drawing high-strength steel gas protection solid welding wire |
| CN112453662A (en) * | 2020-12-03 | 2021-03-09 | 南京钢铁股份有限公司 | Submerged-arc welding process suitable for 1000 MPa-grade high-strength steel |
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Open date: 20100609 |