CN112247399A - 700 MPa-level annealing-free drawing high-strength steel gas protection solid welding wire - Google Patents
700 MPa-level annealing-free drawing high-strength steel gas protection solid welding wire Download PDFInfo
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- CN112247399A CN112247399A CN202011305164.7A CN202011305164A CN112247399A CN 112247399 A CN112247399 A CN 112247399A CN 202011305164 A CN202011305164 A CN 202011305164A CN 112247399 A CN112247399 A CN 112247399A
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
Abstract
The invention provides a 700 MPa-grade annealing-free drawing high-strength steel gas protection solid welding wire, which comprises the following chemical components in percentage by weight: c: 0.05 to 0.11 percent; si: 0.40-0.80%; mn: 1.60-1.80%; p < 0.015%; s is less than 0.010%; cr: 0.10-0.30%; ti: 0.08-0.16%; mo: 0.20-0.40%; ni: 0.60-1.00%; the balance being Fe. The 700 MPa-grade annealing-free drawing high-strength steel gas-shielded solid welding wire provided by the invention determines the component ranges of C, Si, Mn, Cr, Mo, Ni, Mo and Ti, the weld metal has high strength and excellent low-temperature impact toughness, the all-position welding process performance is good, the weld surface is smooth and uniform, the weld bead appearance is attractive, and the 700 MPa-grade annealing-free drawing high-strength steel gas-shielded solid welding wire is suitable for all-position welding of 700 MPa-grade high-strength steel.
Description
Technical Field
The invention relates to the technical field of welding materials, in particular to a 700 MPa-grade annealing-free drawing high-strength steel gas protection solid welding wire.
Background
With the development of industry, energy and construction industries mainly using large steel structures are under vigorous development, and in recent years, the implementation of light weight strategies of engineering structures attracts general attention of people, and the high strength steel becomes the development trend of the current steel industry, and meanwhile, with the development of new alloy design and advanced manufacturing processes, the strength and toughness of the high strength steel are continuously improved. The continuous requirement of welding components on high strength and the continuous popularization and application of novel high-strength steel lead people to continuously improve the welding process, and simultaneously, higher requirements are provided for high-strength steel welding materials, so that the demand of various high-performance high-quality high-end welding materials for strategic novel industries is increased greatly. At present, a high-strength steel welding material in domestic market can meet the requirement that a deposited metal has tensile strength larger than 700MPa and is not annealed and drawn rarely, such a traditional high-strength steel welding wire coil alloy system contains a large amount of Cr elements, the work hardening is obvious, a finished product after a coil is roughly drawn to 4.1mm has high tensile strength and poor shaping, the fine drawing process is difficult, and the coil is softened by one or more heat treatment (annealing) processes after the rough drawing production process so as to ensure that the coil is drawn to the specification of the finished product; the strength and the hardness of the annealed wire rod are unstable; thereby affecting the welding process performance of the finished welding wire and having common low-temperature impact toughness.
Based on the fact that certain gap exists between the current domestic 700 MPa-grade annealing-free drawing high-strength steel welding wire and abroad, particularly, welding materials matched with the 700 MPa-grade high-strength steel cannot well meet the use requirements in some aspects, the development of an ER70-G welding wire which is free of annealing drawing, stable in production process, excellent in welding process stability and good in weld joint strength and toughness matching is urgently needed to meet the requirements of production and market; the market competitiveness of the product is improved.
The chemical components of the weld metal play an important role in the structure transformation, the mechanical property of the weld metal mainly depends on the microstructure, the content of alloy elements in the welding wire is properly improved, the solid solution amount of the alloy elements in a ferrite matrix is increased, the strength of the weld metal can be improved, meanwhile, the hardenability of the weld metal added with the alloy elements is increased, the continuous cooling transformation process of the weld metal is influenced, and the impact absorption energy can be obviously reduced due to the appearance of the hardenability structure. Therefore, the development of the high-strength steel welding wire must simultaneously consider the strength and the low-temperature impact absorption energy, but the development of the high-strength grade high-strength steel solid welding wire in China has no mature experience at present.
Disclosure of Invention
In view of the above, the invention aims to provide a 700 MPa-grade annealing-free drawing high-strength steel gas protection solid welding wire, the component ranges of C, Si, Mn, Cr, Mo, Ni, Mo and Ti are determined, the 700 MPa-grade high-strength steel is welded by adopting the welding wire, the weld metal has high strength and excellent low-temperature impact toughness, the all-position welding process performance is good, the weld surface is smooth and uniform, and the weld bead appearance is attractive. The welding method is suitable for all-position welding of 700MPa grade high-strength steel.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a700 MPa-grade annealing-free drawing high-strength steel gas protection solid welding wire comprises the following chemical components in percentage by weight: c: 0.05 to 0.11 percent; si: 0.40-0.80%; mn: 1.60-1.80%; p < 0.015%; s is less than 0.010%; cr: 0.10-0.30%; ti: 0.08-0.16%; mo: 0.20-0.40%; ni: 0.60-1.00%; the balance being Fe.
C is a main element for ensuring the strength of the weld metal, but the excessive C causes splashing to influence the technological performance of the welding wire, and simultaneously promotes the formation of high-carbon martensite to influence the impact toughness of the weld metal. The welding process performance and the welding seam toughness of the welding wire can be ensured by controlling the carbon element in a proper range, so that the content of C in the welding wire is controlled within the range of 0.05-0.11%.
Si is a deoxidizing element and also plays a role in solid solution strengthening. Si increases the strength of the weld metal, but decreases the toughness of the weld metal. The content of Si in the welding wire is low, the deoxidation is insufficient, and the low-temperature impact toughness of the welding line is influenced; the high Si content promotes the hardening of the weld metal, reduces the low-temperature toughness of the weld metal, increases welding spatter and reduces the technological performance of the welding wire. The welding wire contains a proper amount of Si, so that non-metallic inclusions in a welding seam can be reduced, the impact toughness of welding seam metal can be improved, and the content of Si in the welding wire is controlled to be 0.4-0.8%.
Mn is a strengthening element and a deoxidizing element of weld metal, and the welding wire needs to have enough Mn content to achieve the deoxidizing effect. Mn is an austenite stabilizing element, the volume fraction of acicular ferrite of the weld metal can be improved by adding Mn into the welding wire, the quantity of proeutectoid ferrite is reduced, a low-carbon bainite structure is easy to obtain, and the increase of the manganese content can improve the high toughness of the steel and the strength of the steel. Therefore, the Mn content in the welding wire is controlled to be 1.6-1.8%.
Cr is an element that expands the γ phase region, lowers the γ → α transformation critical temperature, and allows austenite transformation to proceed at a lower temperature. The hardness of the weld metal increases with increasing Cr content, increasing substantially linearly at low Mn content but non-linearly at high Mn content. The influence of Cr on the weld strength is similar to that of Mn, the weld metal strength is increased with the increase of Cr content, but the effect of Cr is weaker than that of Mn, and when the Cr content exceeds 0.3%, a side plate bar ferrite with a second phase is generated with the increase of C content, so that the toughness of the weld is deteriorated and the work hardening tendency is obvious. Therefore, the Cr content in the welding wire is controlled to be 0.1-0.3%.
Mo is an element for reducing a gamma phase region, is a medium-strength carbide forming element and mainly has the function of delaying the transformation of proeutectoid ferrite so as to be beneficial to forming a bainite structure. Mo is solid-dissolved in austenite or exists in the form of carbide in the weld, and strongly suppresses pearlite transformation. The proper Mo content can obviously shorten the incubation period of bainite transformation, further prolong the incubation period of ferrite-pearlite transformation and is beneficial to obtaining a medium-temperature transformation structure under a wider cooling condition. Therefore, the Mo content in the welding wire is controlled to be 0.2-0.4%.
Ni: is an austenite stabilizing element, Ni is infinitely dissolved in gamma-Fe, and plays a role in solid solution strengthening in weld metal, and can increase acicular ferrite precipitation and refinement tissues. Ni has a similar action to Mn, but is weaker than Mn and is a weak strengthening alloy element. In the whole cooling speed range of the weld metal, Ni can reduce the transformation temperature, and the reduction degree of the starting transformation temperature of the side plate bar ferrite is obviously larger than that of the starting transformation temperature of the acicular ferrite. This effect of Ni is more favorable for the formation of acicular ferrite when Mn is contained in the weld metal. Therefore, the Ni content in the welding wire is controlled between 0.6 and 1.0 percent.
Ti is added as a microalloy element, and a trace amount of Ti and N are added to form TiN particles, so that metal grains of the weld metal are effectively prevented from growing and refining grains, the Ti can also reduce the formation of a pro-eutectoid ferrite, and the content of acicular ferrite is increased.
S, P are harmful elements that severely deteriorate the weld performance, mainly by lowering the upper plateau toughness and increasing the ductile to brittle transition temperature, leading to hydrogen induced cracking. At the same level, S has a 4-fold detrimental effect as P. Therefore, the amount of S, P, especially S, in the weld must be strictly controlled to limit their detrimental effects. In the invention, S, P is controlled to be S less than 0.010 and P less than 0.015.
Further, the chemical components comprise the following components in percentage by weight: 0.075% of C, 1.52% of Mn, 0.66% of Si, 0.15% of Cr, 0.33% of Mo, 0.62% of Ni and 0.05% of Ti.
Further, the chemical components comprise the following components in percentage by weight: c: 0.06%, Mn: 1.68%, Si: 0.65%, Cr: 0.15%, Mo: 0.30%, Ni: 0.65%, Ti: 0.09 percent.
Further, 80% Ar + 20% CO was used2Melting with argon-rich mixed gasAnd (5) metallization welding.
The invention also provides a preparation method of the 700 MPa-grade annealing-free drawing high-strength steel gas-shielded solid welding wire, which comprises the following steps:
1) controlling the sulfur content of the molten iron fed into the furnace by adopting desulfurized molten iron;
2) adopting a converter for steelmaking, selecting raw materials with low S, P content, adopting a top-bottom combined blowing process, and controlling C, S, P at a smelting end point to be at a lower level;
3) after deoxidation alloying, adopting external refining processes such as LF furnace and the like to smelt molten steel with components meeting the requirements;
4) the molten steel is cast into a continuous casting billet by a variety casting machine under full protection, and the continuous casting billet is rolled into a wire rod by a high-speed non-twisting mill;
5) the wire rod is made into a finished product welding wire through shelling, acid washing, borax coating, rough drawing, fine drawing and copper plating.
Further, the diameter of the wire rod is phi 5.5 mm.
Further, the diameter of the finished welding wire is phi 1.2 mm.
Compared with the prior art, the 700 MPa-grade annealing-free drawing high-strength steel gas protection solid welding wire has the following advantages:
1. the welding wire is smelted by an industrial converter, rolled by a high-speed non-twisting mill and drawn to be processed into a finished welding wire, and the production is easy to realize.
2. The welding wire adopts 80% Ar + 20% CO2The argon-rich mixed gas welding has the advantages of small welding spatter, good arc stability and all-position operability, beautiful welding seam formation and excellent welding process performance of the welding wire.
3. The welding wire adopts 80% Ar + 20% CO2The argon-rich mixed gas welding is carried out, the yield strength Rel of deposited metal is more than or equal to 6100MPa, the tensile strength Rm is more than or equal to 700MPa, the elongation is more than or equal to 16 percent, and the impact energy at minus 40 ℃ is more than or equal to 27J.
4. The invention can realize the drawing process of the traditional high-strength steel welding wire without annealing and can obviously improve the stability of the welding wire product with the strength grade and the welding process performance, thereby having obvious economic and social benefits.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail with reference to examples.
Example 1:
a700 MPa-grade annealing-free drawing high-strength steel gas protection solid welding wire comprises the following chemical components (in percentage by weight): 0.075 of C, 1.52 of Mn1, 66 of Si0.66, 0.15 of Cr0.33 of Mo0, 0.62 of Ni0, 0.05 of Ti0, and the balance of iron and inevitable impurities.
The 700 MPa-grade annealing-free drawing high-strength steel gas-shielded solid welding wire is prepared by the following steps:
1) controlling the sulfur content of the molten iron fed into the furnace by adopting desulfurized molten iron;
2) adopting a converter for steelmaking, selecting raw materials with low S, P content, adopting a top-bottom combined blowing process, and controlling C, S, P at a smelting end point to be at a lower level;
3) after deoxidation alloying, adopting external refining processes such as LF furnace and the like to smelt molten steel with components meeting the requirements;
4) the molten steel is cast into a continuous casting billet by a variety casting machine under full protection, and the continuous casting billet is rolled into a wire rod with the diameter of 5.5mm by a high-speed non-twisting mill;
5) the wire rod is made into a finished welding wire with the diameter of 1.2mm by shelling, acid washing, borax coating, rough drawing, fine drawing and copper plating.
The welding wire of the embodiment adopts 80% Ar + 20% CO2And (3) performing deposited metal welding by using the argon-rich mixed gas, wherein the test plate is Q235, the thickness is 20mm, the bevel angle is 22.5 degrees, and the root gap is 12 mm.
The welding specification is as follows: the welding current is 250-270A, the welding voltage is 28-30V, the welding speed is 30cm/min, the gas flow is 20L/min, and the interlayer temperature is less than or equal to 150 ℃.
Yield strength σ s of the deposited metal is 592Mpa, tensile strength σ b is 661Mpa, elongation of the deposited metal is 25%, and impact energy AkV of the deposited metal at-40 ℃ is 90J.
The welding wire of the embodiment adopts 80% Ar + 20% CO2 argon-rich mixed gas to weld 900 MPa-grade steel, the test plate size is 20mm multiplied by 200mm multiplied by 500mm, a V-shaped groove is adopted, and the V-shaped groove angle is 30 degrees.
The specification is as follows: the welding current is 220-260A, the welding voltage is 22-28V, the welding speed is 16-20 cm/min, the gas flow is 20L/min, and the interlayer temperature is 150 ℃.
The tensile strength of the weld metal is sigma b equal to 646Mpa, and the impact energy of the weld metal at 40 ℃ is AkV equal to 70J.
Example 2:
a700 MPa-grade annealing-free drawing high-strength steel gas protection solid welding wire comprises the following chemical components (in percentage by weight): 0.06 of C, 1.68 of Mn1, 0.65 of Si0, 0.15 of Cr0.30 of Mo0, 0.65 of Ni0, and 0.09 of Ti0, and the balance of iron and inevitable impurities.
The 700 MPa-grade annealing-free drawing high-strength steel gas-shielded solid welding wire is prepared by the following steps:
1) controlling the sulfur content of the molten iron fed into the furnace by adopting desulfurized molten iron;
2) adopting a converter for steelmaking, selecting raw materials with low S, P content, adopting a top-bottom combined blowing process, and controlling C, S, P at a smelting end point to be at a lower level;
3) after deoxidation alloying, adopting external refining processes such as LF furnace and the like to smelt molten steel with components meeting the requirements;
4) the molten steel is cast into a continuous casting billet by a variety casting machine under full protection, and the continuous casting billet is rolled into a wire rod with the diameter of 5.5mm by a high-speed non-twisting mill;
5) the wire rod is made into a finished welding wire with the diameter of 1.2mm by shelling, acid washing, borax coating, rough drawing, fine drawing and copper plating.
The welding wire of the embodiment adopts 80% Ar + 20% CO2The argon-rich mixed gas is used for welding deposited metal, the material, specification, bevel angle and welding process of a test plate are the same as those of the example 1, the yield strength sigma s of the deposited metal is 670Mpa, the tensile strength sigma b is 745Mpa, the elongation is 23%, the impact energy AkV at the temperature of-40 ℃ of the deposited metal is 140J,
the welding wire of the embodiment adopts 80% Ar + 20% CO2The argon-rich mixed gas welds 700 MPa-grade steel, the specification of a test plate, the bevel angle and the welding process are the same as those of the example 1, and the tensile strength of weld metal is that sigma b is 790MPaAnd the impact energy of the weld metal at-40 ℃ is AkV-110J.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The utility model provides a 700MPa level exempts from to anneal and draws high-strength steel gas protection solid welding wire which characterized in that: the chemical components of the material by weight percentage are as follows: c: 0.05 to 0.11 percent; si: 0.40-0.80%; mn: 1.60-1.80%; p < 0.015%; s is less than 0.010%; cr: 0.10-0.30%; ti: 0.08-0.16%; mo: 0.20-0.40%; ni: 0.60-1.00%; the balance being Fe.
2. The 700MPa grade annealing-free drawing high-strength steel gas-shielded solid welding wire according to claim 1, characterized in that: the chemical components of the material by weight percentage are as follows: 0.075% of C, 1.52% of Mn, 0.66% of Si, 0.15% of Cr, 0.33% of Mo, 0.62% of Ni and 0.05% of Ti.
3. The 700MPa grade annealing-free drawing high-strength steel gas-shielded solid welding wire according to claim 1, characterized in that: the chemical components of the material by weight percentage are as follows: c: 0.06%, Mn: 1.68%, Si: 0.65%, Cr: 0.15%, Mo: 0.30%, Ni: 0.65%, Ti: 0.09 percent.
4. The 700MPa grade annealing-free drawing high-strength steel gas shielded solid welding wire according to any one of claims 1 to 3, characterized in that: 80% Ar + 20% CO was used2And (4) performing deposited metal welding by using the argon-rich mixed gas.
5. The preparation method of the 700MPa grade annealing-free drawing high-strength steel gas-shielded solid welding wire according to any one of claims 1 to 3, characterized by comprising the following steps: the method comprises the following steps:
1) controlling the sulfur content of the molten iron fed into the furnace by adopting desulfurized molten iron;
2) adopting a converter for steelmaking, selecting raw materials with low S, P content, adopting a top-bottom combined blowing process, and controlling C, S, P at a smelting end point to be at a lower level;
3) after deoxidation alloying, adopting external refining processes such as LF furnace and the like to smelt molten steel with components meeting the requirements;
4) the molten steel is cast into a continuous casting billet by a variety casting machine under full protection, and the continuous casting billet is rolled into a wire rod by a high-speed non-twisting mill;
5) the wire rod is made into a finished product welding wire through shelling, acid washing, borax coating, rough drawing, fine drawing and copper plating.
6. The preparation method of the 700MPa grade annealing-free drawing high-strength steel gas shielded solid welding wire according to claim 5, characterized in that: the diameter of the wire rod is phi 5.5 mm.
7. The preparation method of the 700MPa grade annealing-free drawing high-strength steel gas shielded solid welding wire according to claim 5, characterized in that: the diameter of the finished welding wire is phi 1.2 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011305164.7A CN112247399A (en) | 2020-11-19 | 2020-11-19 | 700 MPa-level annealing-free drawing high-strength steel gas protection solid welding wire |
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| CN202011305164.7A CN112247399A (en) | 2020-11-19 | 2020-11-19 | 700 MPa-level annealing-free drawing high-strength steel gas protection solid welding wire |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112792479A (en) * | 2021-04-07 | 2021-05-14 | 四川西冶新材料股份有限公司 | High-strength high-toughness gas shielded welding solid welding wire for X90 pipeline steel and preparation method thereof |
| CN114875332A (en) * | 2022-05-30 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Production method of annealing-free wire rod for high-strength alloy welding wire of 80 kilograms or more |
| CN116640992A (en) * | 2023-05-26 | 2023-08-25 | 本钢板材股份有限公司 | Steel H08Mn2CrMo for gas shield welding wire and preparation method thereof |
| CN116657042A (en) * | 2023-05-26 | 2023-08-29 | 本钢板材股份有限公司 | Wire rod steel for high-alloy welding wire and preparation method thereof |
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| CN114875332A (en) * | 2022-05-30 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Production method of annealing-free wire rod for high-strength alloy welding wire of 80 kilograms or more |
| CN116640992A (en) * | 2023-05-26 | 2023-08-25 | 本钢板材股份有限公司 | Steel H08Mn2CrMo for gas shield welding wire and preparation method thereof |
| CN116657042A (en) * | 2023-05-26 | 2023-08-29 | 本钢板材股份有限公司 | Wire rod steel for high-alloy welding wire and preparation method thereof |
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Application publication date: 20210122 |