CN112719692B - 900 MPa-grade high-strength steel gas shielded solid welding wire and preparation method thereof - Google Patents
900 MPa-grade high-strength steel gas shielded solid welding wire and preparation method thereof Download PDFInfo
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- CN112719692B CN112719692B CN202110354929.4A CN202110354929A CN112719692B CN 112719692 B CN112719692 B CN 112719692B CN 202110354929 A CN202110354929 A CN 202110354929A CN 112719692 B CN112719692 B CN 112719692B
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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
- B23K35/3066—Fe as the principal constituent with Ni 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
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
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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
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Abstract
The invention provides a 900 MPa-grade high-strength steel gas shielded solid welding wire and a preparation method thereof, and relates to the technical field of welding. The chemical components of the material by weight percentage are as follows: c: 0.04-0.06%, Si: 0.2-0.3%, Mn: 1.3-1.5%, Ni: 3.0-3.4%, Cr: 0.4-0.6%, Mo: 0.5 to 0.7%, Ti: 0.04-0.1%, P: 0.006% or less, S: less than 0.005 percent, and the balance of Fe. The preparation method is to prepare the solid welding wire by adopting the desulfurized molten iron. The solid welding wire produced by the invention has better strength and plasticity and toughness, and can meet the hardness elimination requirement of the high-strength steel welded component of 900MPa or above; the preparation method of the invention can be used for preparing the solid welding wire which meets the strength and the plasticity and toughness in a suitable way, so that the welded solid welding wire meets the hardness eliminating requirement of the high-strength steel welded component of 900MPa or above.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a 900 MPa-grade high-strength steel gas shielded solid welding wire and a preparation method thereof.
Background
With the rapid development of science and technology, low-alloy high-strength steel is more and more widely applied to important projects such as buildings, hydropower plants, vehicles, cranes, pressure vessels, petrochemical engineering and the like, the application range of high-strength-grade steel is gradually enlarged, and the number of matched welding materials meeting the requirements of high strength and high toughness is relatively small, particularly, the welding materials meeting the requirement of the overall hardening elimination treatment after welding of the high-strength steel are extremely lost, so that the application of the high-strength steel is limited.
At present, for high-strength steel of 900MPa or above, the existing welding material can meet the requirement on strength, but the poor ductility and toughness often cause cracking of the high-strength steel of 900MPa or above after welding, and particularly can not meet the requirement on hardness elimination of a high-strength steel welded component of 900MPa or above, thus the application progress of the high-strength steel is slow.
Disclosure of Invention
The invention aims to provide a 900 MPa-grade high-strength steel gas-shielded solid welding wire which has better strength and ductility and toughness and can meet the hardness-eliminating requirement of a high-strength steel welded component of 900MPa or above.
The second purpose of the invention is to provide a preparation method of a 900MPa grade high-strength steel gas shielded solid welding wire, which can be used for preparing the solid welding wire which meets the strength and the plastic toughness and meets the hardness-eliminating requirement of a high-strength steel welded component of 900MPa or above after welding.
The embodiment of the invention is realized by the following technical scheme:
a900 MPa-grade high-strength steel gas shielded solid welding wire comprises the following chemical components in percentage by weight: c: 0.04-0.06%, Si: 0.2-0.3%, Mn: 1.3-1.5%, Ni: 3.0-3.4%, Cr: 0.4-0.6%, Mo: 0.5 to 0.7%, Ti: 0.04-0.1%, P: 0.006% or less, S: less than 0.005 percent, and the balance of Fe.
In the invention, C is a main element for ensuring the strength of the solid welding wire, but is also a brittle element in a high-strength steel welding seam, if the content of C is too high, the crack resistance and the impact toughness of the welding wire can be influenced, and the production and the manufacture of welding wire steel are not facilitated; therefore, the weight percentage of C in the welding wire is controlled within the range of 0.04-0.06%, so that the strength of the solid welding wire is ensured, and the influence on the crack resistance and impact toughness of the welding wire is avoided;
si is a commonly used deoxidizer in welding wire production, can improve the welding process performance, and can reduce the ductility and toughness of the welding wire while effectively improving the strength of the welding wire, so that in order to ensure the ductility and toughness of the welding wire, the weight percentage of Si is controlled within the range of 0.2-0.3%, and the ductility and toughness of the welding wire can be ensured while effectively improving the strength of the welding wire;
mn is an austenite stabilizing element, the strength of the welding wire can be improved through solid solution strengthening, the acicular ferrite content of the welding wire is refined and remarkably increased along with the increase of the Mn content, the content of eutectoid ferrite is reduced, the number of side plate bar ferrite is obviously reduced, and Wei-Kirschner tissues are formed in the welding wire due to the excessively high Mn content, so that the ductility and toughness of the welding wire are reduced; therefore, the weight percentage of Mn in the welding wire is controlled within the range of 1.3-1.5% so as to ensure the plasticity and toughness of the welding wire;
according to the invention, the content of C, Si and Mn is controlled, so that the strength of the welding wire is effectively improved, the plasticity and toughness of the welding wire can be ensured, and the cracking of high-strength steel of 900MPa or above after welding can be effectively avoided.
In the invention, Ni is an austenite stabilizing element, is a main element for ensuring the low-temperature toughness of weld metal, and has similar action with Mn;
TiO and TiN formed by Ti and O, N have higher melting points, can be used as nucleation cores of acicular ferrite, can prevent the growth of austenite grains and refine the grains; trace Ti can obviously improve the weld structure, improve the low-temperature toughness and ensure the crack resistance;
when the Cr element and the Ni element are used together, the hardenability can be effectively improved, and simultaneously, the Cr element can be used for strengthening a matrix in a solid solution manner, so that the comprehensive performance of the welding wire after high-temperature tempering at 550 ℃ is ensured; however, too high Cr content increases the brittle transition temperature of the wire, decreasing weldability; therefore, the weight percentage of Cr in the welding wire is controlled within the range of 0.4-0.6%, and the welding performance of the welding wire is prevented from being reduced due to overhigh Cr content;
mo can strongly inhibit the nucleation and growth of pearlite, promote the generation of a bainite structure and enable the welding wire to obtain a medium-temperature transformation structure within a wide cooling temperature range; the strengthening effect is similar to that of Cr, the gamma phase region can be reduced by excessively high Mo content, the phase change temperature interval is shortened, replacement solid solution strengthening is generated, lattice distortion is caused, and the impact toughness of the material is reduced, so that the toughness of the welding wire is not favorable by excessively high Mo content; therefore, the weight percentage of Mo in the welding wire is controlled within the range of 0.5-0.7%; the influence of the excessively high Mo content on the plasticity and toughness of the welding wire is avoided;
s, P is a harmful element that reduces the toughness of the upper platform and increases the ductile-brittle transition temperature, leading to hydrogen induced cracking; therefore, the S, P content in the welding wire is strictly controlled;
according to the invention, through the optimized proportion of the alloy (Ni, Ti, Cr and Mo), the ductility and toughness of the welding wire can be effectively ensured, and the contents of S and P are strictly controlled, so that the impurities in the welding wire are reduced, the purity of the welding wire is ensured, and the hardness eliminating requirement of the welding wire on high-strength steel welded components of 900MPa or above can be effectively met.
Further, the preparation method of the 900 MPa-grade high-strength steel gas shielded solid welding wire comprises the following steps:
s1: adopting the desulfurized molten iron containing the chemical components in percentage to smelt molten steel by using a vacuum furnace, casting the molten steel into a continuous casting billet in the whole process under the protection of nitrogen, and rolling the continuous casting billet into a wire rod by using a rolling mill;
s2: and sequentially carrying out shelling, acid pickling, borax coating, rough drawing, tempering treatment, fine drawing and copper plating treatment on the prepared wire rod to prepare a finished solid welding wire with the diameter of 0.8-1.6 mm.
The molten steel is smelted by the desulfurized molten iron containing the chemical components in percentage by weight in a vacuum furnace, and the molten steel is cast into a continuous casting billet by adopting nitrogen protection in the whole process, so that the purity of the components of the welding wire can be ensured, and the content of impurity elements influencing the plasticity and toughness of the welding wire is reduced to the maximum extent.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
1. the invention can ensure the strength and the plasticity and toughness of the welding wire by controlling the content proportion of each chemical component, improve the crack resistance of the high-strength steel after welding and meet the hardness-eliminating requirement of the high-strength steel after welding.
2. The preparation method of the solid welding wire further reduces the content of impurity elements influencing the plasticity and toughness of the welding wire in the production process, ensures the purity of the solid welding wire and ensures that the produced solid welding wire has excellent performance.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The embodiment of the invention provides a 900 MPa-grade high-strength steel gas shielded solid welding wire and a preparation method thereof.
Example 1
The embodiment provides a 900 MPa-grade high-strength steel gas shielded solid welding wire which comprises the following chemical components in percentage by weight: c: 0.04%, Si: 0.2%, Mn: 1.3%, Ni: 3.0%, Cr: 0.5%, Mo: 0.5%, Ti: 0.04%, P: 0.003%, S: 0.005% and the balance Fe.
The embodiment also provides a preparation method of the 900 MPa-grade high-strength steel gas shielded solid welding wire, which comprises the following steps:
s1: adopting the desulfurized molten iron containing the chemical components in percentage by weight to smelt molten steel by using a vacuum furnace, casting the molten steel into a continuous casting billet in the whole process under the protection of nitrogen, and rolling the continuous casting billet into a wire rod by using a rolling mill;
s2: and sequentially carrying out shelling, acid pickling, borax coating, rough drawing, tempering treatment, fine drawing and copper plating treatment on the prepared wire rod to prepare a finished solid welding wire with the diameter of 0.8 mm.
Example 2
The embodiment provides a 900 MPa-grade high-strength steel gas shielded solid welding wire which comprises the following chemical components in percentage by weight: c: 0.05%, Si: 0.25%, Mn: 1.42%, Ni: 3.1%, Cr: 0.6%, Mo: 0.55%, Ti: 0.05%, P: 0.004%, S: 0.002%, and the balance of Fe.
The embodiment also provides a preparation method of the 900 MPa-grade high-strength steel gas shielded solid welding wire, which comprises the following steps:
s1: adopting the desulfurized molten iron containing the chemical components in percentage by weight to smelt molten steel by using a vacuum furnace, casting the molten steel into a continuous casting billet in the whole process under the protection of nitrogen, and rolling the continuous casting billet into a wire rod by using a rolling mill;
s2: and sequentially carrying out shelling, acid pickling, borax coating, rough drawing, tempering treatment, fine drawing and copper plating treatment on the prepared wire rod to prepare a finished solid welding wire with the diameter of 1.6 mm.
Example 3
The embodiment provides a 900 MPa-grade high-strength steel gas shielded solid welding wire which comprises the following chemical components in percentage by weight: c: 0.055%, Si: 0.3%, Mn: 1.5%, Ni: 3.3%, Cr: 0.4%, Mo: 0.65%, Ti: 0.08%, P: 0.006%, S: 0.004%, and the balance of Fe.
The embodiment also provides a preparation method of the 900 MPa-grade high-strength steel gas shielded solid welding wire, which comprises the following steps:
s1: adopting the desulfurized molten iron containing the chemical components in percentage by weight to smelt molten steel by using a vacuum furnace, casting the molten steel into a continuous casting billet in the whole process under the protection of nitrogen, and rolling the continuous casting billet into a wire rod by using a rolling mill;
s2: and sequentially carrying out shelling, acid pickling, borax coating, rough drawing, tempering treatment, fine drawing and copper plating treatment on the prepared wire rod to prepare a finished solid welding wire with the diameter of 1.0 mm.
Example 4
The embodiment provides a 900 MPa-grade high-strength steel gas shielded solid welding wire which comprises the following chemical components in percentage by weight: c: 0.06%, Si: 0.22%, Mn: 1.45%, Ni: 3.4%, Cr: 0.4%, Mo: 0.7%, Ti: 0.1%, P: 0.005%, S: 0.003% and the balance Fe.
The embodiment also provides a preparation method of the 900 MPa-grade high-strength steel gas shielded solid welding wire, which comprises the following steps:
s1: adopting the desulfurized molten iron containing the chemical components in percentage by weight to smelt molten steel by using a vacuum furnace, casting the molten steel into a continuous casting billet in the whole process under the protection of nitrogen, and rolling the continuous casting billet into a wire rod by using a rolling mill;
s2: and sequentially carrying out shelling, acid pickling, borax coating, rough drawing, tempering treatment, fine drawing and copper plating treatment on the prepared wire rod to prepare a finished solid welding wire with the diameter of 1.4 mm.
Examples of the experiments
Carrying out deposited metal welding experiments on the solid welding wire samples prepared in the embodiments 1-4, wherein Q235 (edge stacking) is selected as a test plate, the thickness is 20mm, the bevel angle is 25 degrees, and the root gap is 16 mm; the welding specification is as follows: welding current 330A, welding voltage 33V, welding speed of 25cm/min, gas flow of 20L/min and interlayer temperature of 150 ℃; the mechanical properties of the weld metal were tested after welding and the results are shown in table 1.
In addition, the solid welding wire samples prepared in the embodiments 1-4 are respectively taken to weld 900MPa grade high-strength steel according to the welding method in the embodiments, the 900MPa grade high-strength steel is selected as a test plate, and the size of the test plate is 300mm multiplied by 150mm multiplied by 40 mm; an asymmetric X-shaped groove is adopted, and the angle of the groove is 25 degrees; the welding specification is as follows: welding current 330A, welding voltage 33V, welding speed 25cm/min and gas flow 20L/min; preheating a metal test plate to be welded at 100 ℃ and controlling the interlayer temperature to be 150 ℃; 80% Ar + 20% CO is adopted in the welding process2Welding the mixed gas; the mechanical properties of the as-welded weld metal were tested after welding, and the results are shown in table 2; the mechanical properties of the heat treated weld metal were tested after the post-weld samples were heat treated, and the results are shown in table 3.
TABLE 1 weld deposit metal mechanical properties
| Test specimen | Yield strength ReL (MPa) | Tensile Strength Rm (MPa) | Elongation after Break (%) | 40 ℃ impact energy KV2 (J) |
| Example 1 | 904 | 958 | 17 | 97 |
| Example 2 | 908 | 956 | 16.5 | 95 |
| Example 3 | 905 | 957 | 17 | 96 |
| Example 4 | 906 | 954 | 16 | 94 |
Mechanical properties of high-strength steel welding seam with surface 2900 MPa level
| Test specimen | Status of state | Tensile Strength Rm (MPa) | 40 ℃ impact energy KV2 (J) |
| Example 1 | Welded state | 956 | 90 |
| Example 2 | Welded state | 961 | 95 |
| Example 3 | Welded state | 960 | 95 |
| Example 4 | Welded state | 965 | 98 |
Mechanical properties of table 3900 MPa-level high-strength steel weld metal
| Test specimen | Status of state | Tensile Strength Rm (MPa) | 40 ℃ impact energy KV2 (J) |
| Example 1 | 550℃×4h | 967 | 65 |
| Example 2 | 550℃×4h | 965 | 67 |
| Example 3 | 550℃×4h | 966 | 65 |
| Example 4 | 550℃×4h | 970 | 68 |
As can be seen from tables 1, 2 and 3: deposition of solid welding wire produced in examples 1 to 4The metal mechanical property meets the performance required by GB/T8110-; the welding seam metal mechanical property of the solid welding wire welded 900 MPa-grade high-strength steel prepared in the embodiments 1-4 also meets the performance required by the GB/T8110-; when the solid welding wire prepared in the embodiment 1-4 is welded with 900MPa grade high-strength steel, the tensile strength R is obtained in a welding state and a heat treatment statemThe strength is larger than or equal to 950 MPa, which indicates that the solid welding wire has higher strength and meets the hardness eliminating requirement of high-strength steel welded components of 900MPa and above; the impact energy at-40 ℃ is more than or equal to 47J, which indicates that the solid welding wire has higher ductility and toughness and excellent crack resistance when being used for matching welding and welding 900 MPa-grade high-strength steel.
In conclusion, the 900 MPa-grade high-strength steel gas-shielded solid welding wire has excellent strength and plasticity and toughness, meets the hardness-eliminating requirement of a post-welding component of 900 MPa-grade high-strength steel and above, is matched with and welded with the 900 MPa-grade high-strength steel, and has the advantages of excellent crack resistance, good all-position welding process performance, smooth and uniform weld joint surface and attractive weld bead appearance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A900 MPa-grade high-strength steel gas shielded solid welding wire is characterized by being prepared from any one of the following components in percentage by weight:
the solid welding wire comprises the following chemical components in percentage by weight: c: 0.04%, Si: 0.2%, Mn: 1.3%, Ni: 3.0%, Cr: 0.5%, Mo: 0.5%, Ti: 0.04%, P: 0.003%, S: 0.005% and the balance Fe.
The solid welding wire comprises the following chemical components in percentage by weight: c: 0.05%, Si: 0.25%, Mn: 1.42%, Ni: 3.1%, Cr: 0.6%, Mo: 0.55%, Ti: 0.05%, P: 0.004%, S: 0.002%, and the balance of Fe.
The solid welding wire comprises the following chemical components in percentage by weight: c: 0.055%, Si: 0.3%, Mn: 1.5%, Ni: 3.3%, Cr: 0.4%, Mo: 0.65%, Ti: 0.08%, P: 0.006%, S: 0.004%, and the balance of Fe.
The solid welding wire comprises the following chemical components in percentage by weight: c: 0.06%, Si: 0.22%, Mn: 1.45%, Ni: 3.4%, Cr: 0.4%, Mo: 0.7%, Ti: 0.1%, P: 0.005%, S: 0.003% and the balance Fe.
2. The preparation method of the 900MPa grade high-strength steel gas shielded solid welding wire according to claim 1, characterized by comprising the following steps:
s1: smelting molten steel by adopting desulfurized molten iron containing the chemical components in percentage by weight, casting the molten steel into a continuous casting billet, and rolling the continuous casting billet into a wire rod by a rolling mill;
s2: and sequentially carrying out shelling, acid pickling, borax coating, rough drawing, tempering treatment, fine drawing and copper plating treatment on the prepared wire rod to prepare the finished solid welding wire.
3. The preparation method of the 900MPa grade high-strength steel gas shielded solid welding wire as claimed in claim 2, wherein nitrogen gas is adopted for protection in the whole process of casting molten steel into continuous casting billets in the step S1.
4. The method for preparing the 900MPa grade high-strength steel gas shielded solid welding wire according to claim 2, wherein molten iron is melted in a vacuum furnace in the step S1.
5. The preparation method of the 900MPa grade high strength steel gas shielded solid welding wire according to claim 2, characterized in that the diameter of the prepared finished solid welding wire is 0.8 mm-1.6 mm.
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| CN115502609A (en) * | 2022-10-14 | 2022-12-23 | 成都先进金属材料产业技术研究院股份有限公司 | Niobium-titanium-containing welding wire steel for high-strength steel welding wire for water and high-strength steel and production method thereof |
| CN115558860A (en) * | 2022-10-14 | 2023-01-03 | 成都先进金属材料产业技术研究院股份有限公司 | Welding wire for high-strength steel containing vanadium and niobium, welding wire for high-strength steel and production method of welding wire |
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