CN112080696B - Wire rod with excellent low-temperature toughness for 90 kg-grade welding wire and manufacturing method thereof - Google Patents
Wire rod with excellent low-temperature toughness for 90 kg-grade welding wire and manufacturing method thereof Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 11
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 238000010583 slow cooling Methods 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 238000009987 spinning Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 description 31
- 239000002184 metal Substances 0.000 description 30
- 239000010936 titanium Substances 0.000 description 13
- 239000007789 gas Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 8
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- 238000005728 strengthening Methods 0.000 description 7
- 239000000956 alloy Substances 0.000 description 5
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
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- 229910001563 bainite Inorganic materials 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
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- 238000007670 refining Methods 0.000 description 3
- 238000012827 research and development Methods 0.000 description 3
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- 229910052720 vanadium Inorganic materials 0.000 description 3
- 206010039509 Scab Diseases 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Arc Welding In General (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a wire rod for a 90 kg-grade welding wire with excellent low-temperature toughness and a manufacturing method thereof, wherein the wire rod comprises the following steps: 0.05-0.08%, Si: 0.50-0.80%, Mn: 1.50% -1.85%, Ni: 2.20 to 2.50 percent, more than or equal to 1.1 percent of Cr and less than or equal to 1.3 percent of Mo, more than or equal to 0.5 percent of Cr and less than or equal to 0.7 percent of Mo, more than or equal to 0.5 percent of Mo and less than or equal to 0.7 percent of Ti: 0.04 to 0.07 percent of the total weight of the composition, P: less than or equal to 0.008 percent, S: less than or equal to 0.005 percent, Als: less than or equal to 0.02 percent, less than or equal to 1.5ppm of H, less than or equal to 20ppm of O, less than or equal to 50ppm of N, and the balance of Fe and impurities. The yield strength Rp0.2 is more than 750MPa, the tensile strength Rm is more than 1000MPa, and the elongation A is more than or equal to 19 percent.
Description
Technical Field
The invention relates to a hot-rolled wire rod, in particular to a wire rod for a 90 kg-grade welding wire with excellent low-temperature toughness and a manufacturing method thereof.
Background
The technical development of steel enterprises provides comprehensive technical support for the research and development of high-strength and ultrahigh-strength steel materials, the technical level of the domestic high-strength and ultrahigh-strength steel materials reaches the international advanced level, steel for low-temperature environments of 90kg level and above is the mainstream of the demand in the fields of engineering machinery, mining machinery, hydropower industry, port equipment, ocean structures and the like, the usage amount is obviously increased, but the difference between the overall performance and research and development capacity of the welding materials and the level of steel in China is large at present, and the performance of a welding seam in a welding structure restricts the performance of the steel and the improvement of the overall structural performance, so that the problem of neck in China is solved. And the wire rod is the basis for producing welding materials meeting the requirements. Therefore, research and development of the 90 kg-grade hot-rolled wire rod which can meet the requirements of high strength, high toughness and low temperature environment are key for improving the comprehensive mechanical property of the welding material cladding metal.
Before the application of the invention, CN 110640350A discloses an ultrahigh-strength gas shielded welding wire and a wire rod, which comprises the following chemical components in percentage by mass: c: 0.05-0.15%, Si: 0.65% -0.80%, Mn: 1.7-2.0%, S is less than or equal to 0.01%, P is less than or equal to 0.015%, Cr: 0.18% -0.28%, Ni: 1.4% -1.8%, Mo: 0.2-0.6%, Ti: 0.10% -0.20%, V: 0.01-0.05%, N: 0.007-0.014%, and 0-0.05% of rare earth elements are added. In order to obtain ultrahigh tensile strength, a certain amount of rare earth elements and higher V, Ti and other microalloy elements are added, and meanwhile, in order to achieve the purposes of precipitation strengthening and solid solution strengthening of the higher microalloy elements, the content of N elements is intentionally increased, so that the smelting difficulty is greatly increased, and if the control is improper, the phenomenon that the content of gas in the wire rod is higher, so that the inclusion is more is caused, and the subsequent drawing and welding effects are influenced is avoided. And the C, Mn element content is higher, which may cause higher carbon equivalent, and affect the weldability and crack resistance of the weld metal material. CN 111101066A discloses a steel wire rod for bainite high-strength welding wires and a production method thereof, and the steel wire rod comprises the following chemical components: c: 0.05 to 0.11 percent, Si: 0.35-0.65%, Mn: 1.60-1.80%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Cr: 0.25% -0.37%, Ni: 1.45-1.85%, Mo: 0.42-0.52%, Ti: 0.13 to 0.16 percent. On one hand, the tensile strength of the wire rod is more than or equal to 900MPa, but the strength of deposited metal and a welding joint after the wire rod is drawn into a welding wire for welding is not clear, the wire rod cannot be applied to welding of 90 kg-grade high-strength steel, and the wire rod cannot be applied to a low-temperature environment; on the other hand, the content of C in the wire rod is 0.05-0.11%, the content of Mn in the wire rod is 1.60-1.80%, and the content of C, Mn is high, which may also cause high carbon equivalent of weld metal, affect the weldability and crack resistance of the weld metal material, and excessive microalloy element Ti increases the cost and smelting difficulty, and affects the strength and low-temperature toughness of the weld metal.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a hot-rolled wire rod for a 90 kg-grade gas shielded welding wire with excellent low-temperature toughness and a manufacturing method thereof, and develops the hot-rolled wire rod for a high-strength and high-toughness gas shielded welding material, which meets the requirements of excellent welding manufacturability and welding stability in a low-temperature environment of-40 ℃ and below.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wire rod for a 90 kg-grade welding wire with excellent low-temperature toughness comprises the following chemical components in percentage by weight: c: 0.05-0.08%, Si: 0.50-0.80%, Mn: 1.50% -1.85%, Ni: 2.20 to 2.50 percent, more than or equal to 1.1 percent of Cr and less than or equal to 1.3 percent of Mo, more than or equal to 0.5 percent of Cr and less than or equal to 0.7 percent of Mo, more than or equal to 0.5 percent of Mo and less than or equal to 0.7 percent of Ti: 0.04 to 0.07 percent of the total weight of the composition, P: less than or equal to 0.008 percent, S: less than or equal to 0.005 percent, Als: less than or equal to 0.02 percent, less than or equal to 1.5ppm of H, less than or equal to 20ppm of O, less than or equal to 50ppm of N, and the balance of Fe and impurities.
The wire rod of the invention has the following chemical component design principle:
c can improve the strength of deposited metal, but can also reduce the low-temperature toughness of the deposited metal at the same time, and influences the welding manufacturability, so that the control of the carbon content in a proper range is the basis for improving the matching of the welding manufacturability and the strengthening and toughening of the welding seam. The wire rod adopts a low-carbon design idea, and the content of carbon element is controlled to be 0.05-0.08%.
Si is a deoxidizing element, can improve welding manufacturability, also has the effect of improving the strength of weld deposit metal but reducing welding low-temperature toughness, and if the silicon content in a wire rod is low, the oxygen content in the weld is easily too high to influence the low-temperature impact toughness of the weld; if the silicon content in the wire rod is too high, the low-temperature impact toughness of the welding seam is also reduced. Therefore, the content of Si is controlled between 0.50 percent and 0.80 percent.
Mn is one of the main strengthening elements in the present invention, and improves the strength by solid solution strengthening. The addition of a proper amount of Mn in the wire rod is also beneficial to deoxidizing weld metal, can improve the strength and low-temperature impact toughness of the weld metal and improve welding manufacturability, but the high Mn content can reduce the elongation and simultaneously deteriorate the low-temperature toughness and weldability. Therefore, the Mn content in the invention is controlled to be 1.50-1.85%.
Phosphorus and sulfur elements have adverse effects on the low-temperature toughness of weld metal, and should be reduced as much as possible, and the requirement of P in the wire rod is as follows: less than or equal to 0.008 percent, S: less than or equal to 0.005 percent.
Ni is the most main element for improving the toughness of the weld metal, particularly the low-temperature impact toughness in the invention. The Ni element is too low, the low-temperature toughness of the weld metal is insufficient, but the Ni element is too high, if the Ni element exceeds 2.5%, the cost is not increased, and the hot cracking tendency of the weld is also increased, and in combination with the two factors, the Ni element content is controlled to be 2.20% -2.50%, on one hand, the austenite area is enlarged through the Ni element, and the Ni element is infinitely dissolved in gamma-Fe, so that the ductile-brittle transition temperature is reduced in the repeated heating and cooling process of welding, the low-temperature toughness of the weld metal is improved, on the other hand, the hot cracking tendency of the weld metal is reduced, and the cost of a wire rod is controlled.
The Cr and Mo elements are main elements for improving the strength of the weld metal, and a proper amount of Cr and Mo elements are added, so that the hardenability of the weld metal is improved, crystal grains are refined, and the strength and low-temperature toughness of the weld metal are improved through solid solution strengthening and precipitation strengthening. However, excessive Cr and Mo can cause hardening of welding seams, increase crack sensitivity of deposited metal, easily cause cracking of welding seam metal and reduce low-temperature toughness of the welding seams, so that 1.1-1% of Cr + Mo is less than or equal to 1.3%, 0.5-0.7% of Cr is less than or equal to 0.5% of Mo is less than or equal to 0.7%.
Ti is an alloy tuning element for refining weld grains and tissues, and trace Ti is added into the wire rod, so that the strength and low-temperature toughness of weld metal can be improved, and the welding performance is improved. Meanwhile, the titanium has high affinity with oxygen, so that Ti in the welding seam is dispersed and distributed in the welding seam in the form of tiny oxides (TiO), and the refining of metal grains of the welding seam is promoted. However, too high Ti content will cause the size of oxide and nitride to be uneven, and affect the metal performance of the welding seam, so Ti is controlled to be 0.04-0.07%.
Particularly, the content of O, N, H and other gas elements is controlled, and the content of the gas elements is too high, so that the wire rod and the weld metal are easy to crack, crisp and contain more inclusions, which affect the processing performance and welding manufacturability of the wire rod on one hand and reduce the low-temperature toughness of the weld metal on the other hand, therefore, the invention controls the gas element range to be as follows: o is less than or equal to 20ppm, N is less than or equal to 50ppm, and H is less than or equal to 1.5 ppm.
A manufacturing method of a wire rod for a 90 kg-grade welding wire with excellent low-temperature toughness comprises the following steps:
molten iron pretreatment → converter or electric furnace smelting → external refining → square billet continuous casting → square billet heating → square billet continuous rolling into small square billet → small square billet slow cooling, cleaning → small square billet heating → rolling → wire winding and rod winding → packaging and warehousing; slow cooling of the square billet: the continuously rolled square billet enters a slow cooling pit for slow cooling, is slowly cooled to below 100 ℃ and then is taken out of the pit, and is slowly cooled for 48-72 hours, so that on one hand, the temperature gradient of the surface layer of the square billet is reduced, the phase change stress is not increased, the generation of microcracks on the surface of a casting blank is reduced, the defects of cracks, folding, scabbing, lugs and the like on the surface of a wire rod are avoided, the surface quality of a subsequent rolled wire rod is improved, and the problems of wire breakage, more iron scales and the like in the drawing process of the wire rod are avoided; on the other hand, the component segregation is reduced, and the components in the square billet are more uniform.
Rolling a wire rod: if the strength of the wire rod is too high, the technical difficulty of the drawing process of the wire rod is increased, and the wire rod is easy to break in the drawing process, the drawing difficulty of the wire rod is reduced by increasing the rolling and spinning temperature of the wire rod and finishing the phase change of the wire rod at a higher temperature, so that the strength and the hardness of the wire rod are reduced, the cogging temperature of a small square billet is 1000 +/-20 ℃, the finish rolling temperature is 980 +/-15 ℃, the finish rolling temperature of a double module is 960 +/-15 ℃, and the spinning temperature is 950 +/-10 ℃.
The invention has the beneficial effects that: the wire rod for the C-Si-Mn-Ni-Cr-Mo-Ti gas-shielded welding material with good low-temperature toughness and 90kg grade is provided, on the basis of an ultra-low carbon alloy material, through relatively simple reasonable matching of alloy elements such as Cr, Mo, Ni, Ti and the like, no other micro-alloy elements such as Nb, V and the like are needed to be added, no precious metal elements such as rare earth and the like are needed to be added, and effective control of harmful elements such as P, S, O, N, H and gas elements is assisted, so that the wire rod produced by the method can be used for preparing the gas-shielded welding wire with outstanding strength and low-temperature toughness, and the welding material can be suitable for Ar + 5% -50% CO2Full position automatic and semi-automatic welding of shielding gas. 1) Compared with the prior art, the smelting process of the wire rod designed by the invention does not need to add rare earth or B and other alloy elements which are difficult to smelt, and is simple and economic. Through effective treatment of the blank and reasonable rolling process, the wire rod has good surface quality and no defects of cracks, folding, scabbing, ears and the like, so that the wire rod designed by the invention has good processing performance and can be processed into gas-shielded welding wires meeting various specifications. 2) The hot rolled wire rod for the gas shielded welding material of ocean engineering and ships developed and developed by the method has yield strength Rp0.2 more than 750MPa, tensile strength Rm more than 1000MPa and elongation A more than or equal to 19 percent. 3) The wire rod manufactured by the method is drawn into a welding wire, the yield strength Rp0.2 of the deposited metal after welding is more than 900MPa, the tensile strength Rm is more than or equal to 990MPa, and the KV is at-40 DEG C2≥50J。
Drawings
FIG. 1 is a wire rod organization chart of example 1;
FIG. 2 is a wire rod organization chart of example 2.
Detailed Description
The following description is given with reference to specific examples:
FIG. 1 is a photograph (500 times) of the microstructure of a wire rod made according to the embodiment of example 1 etched with a 4% nital solution under an optical microscope, and the microstructure of the wire rod is a bainite structure.
FIG. 2 is a photograph of the microstructure of the wire rod manufactured according to the embodiment of example 2 corroded by the 4% nital solution under a scanning electron microscope, and the microstructure of the wire rod is a bainite structure.
The hot-rolled wire rod for the 900 MPa-grade gas shielded welding wire used in the low-temperature environment is manufactured by applying the hot-rolled wire rod, and the chemical components are shown in the following table 1 in percentage by weight.
TABLE 1 chemical composition
| C | Si | Mn | P | S | Ni | Cr | Mo | Ti | Al | |
| Example 1 | 0.051 | 0.66 | 1.51 | 0.072 | 0.0041 | 2.22 | 0.56 | 0.70 | 0.061 | 0.015 |
| Example 2 | 0.062 | 0.78 | 1.62 | 0.074 | 0.0023 | 2.43 | 0.58 | 0.55 | 0.042 | 0.018 |
| Example 3 | 0.053 | 0.51 | 1.84 | 0.052 | 0.0015 | 2.25 | 0.60 | 0.54 | 0.052 | 0.012 |
| Example 4 | 0.052 | 0.71 | 1.74 | 0.024 | 0.0046 | 2.33 | 0.72 | 0.52 | 0.064 | 0.019 |
| Example 5 | 0.079 | 0.78 | 1.56 | 0.031 | 0.0049 | 2.42 | 0.69 | 0.50 | 0.070 | 0.014 |
| Example 6 | 0.067 | 0.65 | 1.58 | 0.023 | 0.0036 | 2.35 | 0.50 | 0.72 | 0.045 | 0.010 |
| Example 7 | 0.077 | 0.69 | 1.79 | 0.049 | 0.0028 | 2.31 | 0.66 | 0.60 | 0.069 | 0.016 |
| Example 8 | 0.061 | 0.76 | 1.64 | 0.056 | 0.0019 | 2.49 | 0.64 | 0.61 | 0.049 | 0.009 |
| Example 9 | 0.075 | 0.59 | 1.69 | 0.077 | 0.0025 | 2.29 | 0.65 | 0.66 | 0.056 | 0.017 |
TABLE 2 gas content
TABLE 3 Rolling Process parameters of wire rods
| The initial rolling temperature/. degree.C | The temperature of finish rolling is higher than | temperature/deg.C of the inlet double module | Spinning temperature/. degree.C | |
| Example 1 | 1015 | 992 | 971 | 958 |
| Example 2 | 1012 | 993 | 974 | 955 |
| Example 3 | 983 | 968 | 951 | 941 |
| Example 4 | 991 | 973 | 962 | 948 |
| Example 5 | 1001 | 976 | 948 | 940 |
| Example 6 | 1008 | 984 | 955 | 946 |
| Example 7 | 999 | 979 | 946 | 949 |
| Example 8 | 1005 | 981 | 969 | 956 |
| Example 9 | 996 | 989 | 961 | 951 |
TABLE 4 tensile Properties of the wire rod
Table 5 shows the tensile properties and low-temperature toughness at-40 ℃ of deposited metals obtained by welding Q890 high-strength steel plates 20 and 60mm thick at a heat input of 10 KJ/cm.
TABLE 5 tensile Properties and Low temperature toughness of deposited metals
| Rp0.2/MPa | Rm/MPa | A/％ | -40℃KV2/J | |
| Example 1 | 909 | 1028 | 19.5 | 60 51 51 |
| Example 2 | 924 | 999 | 19.3 | 74 61 56 |
| Example 3 | 914 | 1004 | 19.6 | 65 70 59 |
| Example 4 | 922 | 997 | 20.6 | 56 72 69 |
| Example 5 | 910 | 1011 | 21.0 | 71 73 60 |
| Example 6 | 920 | 1015 | 19.8 | 61 66 59 |
| Example 7 | 916 | 1019 | 21.1 | 72 60 68 |
| Example 8 | 919 | 1006 | 19.9 | 54 69 75 |
| Example 9 | 917 | 1013 | 20.5 | 74 61 68 |
The hardness of the deposited metal is measured by a 10kg Vickers hardness tester, the hardness of the weld joint with the minimum heat input of 10KJ/cm is measured, the hardness is shown in Table 6, the hardness of the weld joint metal is lower than 400HV, the low hardening tendency of the wire rod drawn welding wire is reflected, and the low crack tendency of the welding material is reflected.
TABLE 6 hardness of deposited metal
Claims (1)
1. A wire rod for a 90 kg-grade welding wire with excellent low-temperature toughness is characterized by comprising the following chemical components in percentage by weight: c: 0.05% -0.08%, Si: 0.65% -0.80%, Mn: 1.62% -1.85%, Ni: 2.20-2.49%, 1.1% or more of Cr and Mo is less than or equal to 1.3%, 0.56% or more of Cr is less than or equal to 0.7%, 0.60% or more of Mo is less than or equal to 0.7%, Ti: 0.04% -0.07%, P: less than or equal to 0.008 percent, S: less than or equal to 0.005 percent, Als: less than or equal to 0.02 percent, less than or equal to 1.5ppm of H, less than or equal to 20ppm of O, less than or equal to 50ppm of N, and the balance of Fe and impurities; the yield strength Rp0.2 of the wire rod is more than 750 MPa; the tensile strength Rm of the wire rod is more than 1000 MPa; the elongation A of the wire rod is more than or equal to 19 percent;
the manufacturing method of the wire rod for the 90 kg-grade welding wire with excellent low-temperature toughness comprises the steps of molten iron pretreatment, smelting, square billet continuous casting, square billet slow cooling, wire rod rolling and wire laying; the rolling of the wire rod is as follows: the initial rolling temperature is 1000 +/-20 ℃, the finish rolling temperature is 976-993 ℃, the finish rolling temperature of the double modules is 960 +/-15 ℃, and the spinning temperature is 950 +/-10 ℃; the slow cooling of the square billet comprises the following steps: slowly cooling to below 100 ℃ and taking out of the pit, and slowly cooling for 48-72 hours.
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| CN112853216A (en) * | 2021-01-07 | 2021-05-28 | 鞍钢集团北京研究院有限公司 | High-strength high-toughness low-alloy steel wire and preparation method and application thereof |
| CN115369330B (en) * | 2022-10-24 | 2023-03-24 | 张家港荣盛特钢有限公司 | 90-kilogram gas shielded welding wire with high welding performance and preparation method thereof |
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