CN116100190A - Mo-containing austenitic stainless steel welding strip and preparation method and application thereof - Google Patents
Mo-containing austenitic stainless steel welding strip and preparation method and application thereof Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 74
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- 239000012535 impurity Substances 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 47
- 238000005266 casting Methods 0.000 claims description 42
- 229910000831 Steel Inorganic materials 0.000 claims description 37
- 239000010959 steel Substances 0.000 claims description 37
- 229910000859 α-Fe Inorganic materials 0.000 claims description 29
- 238000005096 rolling process Methods 0.000 claims description 28
- 238000009749 continuous casting Methods 0.000 claims description 22
- 229910052799 carbon Inorganic materials 0.000 claims description 21
- 238000000227 grinding Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 18
- 229910052742 iron Inorganic materials 0.000 claims description 18
- 238000007670 refining Methods 0.000 claims description 18
- 238000005097 cold rolling Methods 0.000 claims description 17
- 238000005098 hot rolling Methods 0.000 claims description 14
- 229910052698 phosphorus Inorganic materials 0.000 claims description 12
- 238000000137 annealing Methods 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000002356 single layer Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 25
- 239000010935 stainless steel Substances 0.000 abstract description 25
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 32
- 239000002184 metal Substances 0.000 description 20
- 229910052751 metal Inorganic materials 0.000 description 20
- 238000005253 cladding Methods 0.000 description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 239000010410 layer Substances 0.000 description 14
- 229910052759 nickel Inorganic materials 0.000 description 11
- 229910001566 austenite Inorganic materials 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 239000000243 solution Substances 0.000 description 8
- 229910000604 Ferrochrome Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
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- 229910000616 Ferromanganese Inorganic materials 0.000 description 4
- 229910001309 Ferromolybdenum Inorganic materials 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 239000012895 dilution Substances 0.000 description 4
- 238000010790 dilution Methods 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 3
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- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910014458 Ca-Si Inorganic materials 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 238000005261 decarburization Methods 0.000 description 1
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Classifications
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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
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention belongs to the technical field of stainless steel production and manufacturing, and particularly relates to a Mo-containing austenitic stainless steel welding strip, and a preparation method and application thereof. The Mo-containing austenitic stainless steel welding strip comprises the following components in percentage by weight: less than or equal to 0.020% of C, less than or equal to 0.2% of Si, less than or equal to 0.6% of Mn, less than or equal to 2.00% of P, less than or equal to 0.010% of S, less than or equal to 21.00% of Cr, less than or equal to 22.00% of 13.00% of Ni, less than or equal to 14.00% of 2.50% of Mo, less than or equal to 3.00% of 0.03% of N, less than or equal to 0.2% of Cu, and the balance of Fe and unavoidable impurities. According to the Mo-containing austenitic stainless steel welding strip, 1-time overlaying is adopted to replace 2-time overlaying in the overlaying process, the overlaying efficiency is improved by more than 1 time, the Mo-containing austenitic stainless steel welding strip is favored by users, and the Mo-containing austenitic stainless steel welding strip has obvious market popularization value.
Description
Technical Field
The invention belongs to the technical field of stainless steel production and manufacturing, and particularly relates to a Mo-containing austenitic stainless steel welding strip, and a preparation method and application thereof.
Background
The stainless steel welding strip is a typical representative of surfacing composite thinning resource-saving stainless steel, and the technical development is fast in recent years, and the stainless steel welding strip is widely applied to the manufacture of high-temperature and high-pressure hydrogen-resistant containers such as nuclear reaction pressure containers, refinery hydrogenation reactors, gasification furnaces in coal chemical industry and the like. The quality of the build-up welding layer of the stainless steel welding strip is directly related to the safe operation of the pressure vessel in severe environments such as high temperature, high pressure, hydrogen and the like for a long time, so the quality requirement is very high, and the build-up welding layer is mainly expressed as follows: 1) In order to reduce the hot crack sensitivity of the stainless steel welding strip surfacing process, the steel purity and the welding strip structure are required to contain a certain proportion of ferrite structure; 2) In order to reduce quality fluctuation of the build-up welding layer, stable and moderate components, stable and moderate mechanical properties, high dimensional accuracy, good surface quality and plate shape, smooth edge after slitting, no burrs and the like are required. Therefore, the steel has complex production process, high manufacturing difficulty and long-term dependence on import.
The build-up welding layer is generally divided into two layers, build-up welding is carried out on low alloy steel, the first layer is a base coat, 309L stainless steel welding belts are used, the second layer is a corrosion-resistant layer, 316L stainless steel welding belts are used, the two layers of build-up welding are one-time complete build-up welding, and the corrosion-resistant layer after build-up welding is 316L stainless steel. However, the build-up welding is required to build up welding twice, the working efficiency is low, and the build-up welding can be completed in a large pressure container generally more than half a month. Therefore, on the basis of two layers of overlaying, a single-layer overlaying technology is developed, namely, the effect of twice overlaying is achieved by adopting one-time overlaying of a 309Lmo stainless steel welding strip containing Mo, so that a large amount of time can be saved, and the production efficiency is improved.
Disclosure of Invention
The invention provides a Mo-containing austenitic stainless steel welding strip, a preparation method and application thereof, and aims to solve the problems of long working time and low surfacing efficiency of the existing stainless steel welding strip caused by adopting double-layer surfacing.
Specifically, the Mo-containing austenitic stainless steel welding strip comprises the following components in percentage by weight: less than or equal to 0.020% of C, less than or equal to 0.2% of Si, less than or equal to 0.6% of Mn, less than or equal to 2.00% of P, less than or equal to 0.010% of S, less than or equal to 21.00% of Cr, less than or equal to 22.00% of 13.00% of Ni, less than or equal to 14.00% of 2.50% of Mo, less than or equal to 3.00% of 0.03% of N, less than or equal to 0.2% of Cu, and the balance of Fe and unavoidable impurities.
The Mo-containing austenitic stainless steel welding strip comprises the following components in percentage by weight: 0.015% or less of C or less than 0.020%, 0.3% or less of Si or less than 0.5%, 1.50% or less of Mn or less than 2.00%, P or less than 0.020%, S or less than 0.010%, 21.00% or less of Cr or less than 21.50%, 13.50% or less of Ni or less than 14.00%, 2.60% or less of Mo or less than 2.90%, 0.04% or less of N or less than 0.05%, cu or less than 0.1% and the balance of Fe and unavoidable impurities.
The welding strip of the Mo-containing austenitic stainless steel has the ferrite number FN of 9-14%.
On the other hand, the invention also provides a preparation method of the Mo-containing austenitic stainless steel welding strip, which comprises the following steps:
(1) Molten iron pretreatment, converter smelting, VOD furnace refining and LF furnace refining are carried out to obtain molten steel with qualified components;
(2) Continuously casting the molten steel to obtain a continuous casting plate blank;
(3) And grinding and heating the continuous casting slab, performing hot rolling, cold rolling and annealing, and splitting to obtain the Mo-containing austenitic stainless steel welding strip.
According to the preparation method of the Mo-containing austenitic stainless steel welding strip, in the refining process of the VOD furnace, the vacuum degree of the VOD furnace is less than 2mbar, the furnace feeding temperature is more than or equal to 1620 ℃, and the carbon content is reduced to below 0.015wt% by oxygen blowing.
According to the preparation method of the Mo-containing austenitic stainless steel welding strip, in the LF furnace refining process, ca-Si wires are fed at the speed of 4m/t before weak stirring, meanwhile, fe-B is added according to the molten steel amount of 0.3Kg/t, and the outlet temperature is controlled at 1500-1510 ℃.
According to the preparation method of the Mo-containing austenitic stainless steel welding strip, argon is blown into a crystallizer for 5min before casting in the continuous casting process, the casting temperature is 1450-1480 ℃, and the pulling speed is controlled to be 0.9-1.1mm/min.
According to the preparation method of the Mo-containing austenitic stainless steel welding strip, the heating temperature of the continuous casting slab is 1200-1260 ℃, and the heat preservation time is 180-220min.
According to the preparation method of the Mo-containing austenitic stainless steel welding strip, the final rolling temperature of hot rolling is more than or equal to 1030 ℃, and the rate of the last rolling Cheng Bianxing of cold rolling is controlled to be 45-50%; the annealing temperature is 1060-1100 ℃, and the heat preservation time is 0.3-0.7min.
In a further aspect, the invention also provides an application of the Mo-containing austenitic stainless steel welding strip in single-layer build-up welding.
The technical scheme of the invention has the following beneficial effects:
(1) The Mo-containing austenitic stainless steel welding strip has uniform components, low content of C, P, S and other elements, and the ferrite number FN is controlled to 9-14%, so that the ferrite of the cladding metal is effectively ensured to be 3-8%, the stability of a structure at high temperature is ensured, and the cracking of the cladding metal in the surfacing process is avoided;
(2) According to the Mo-containing austenitic stainless steel welding strip, 1-time overlaying is adopted to replace the original 2-time overlaying (TEQ 309 L+TEQ316L) in the overlaying process, the overlaying efficiency is improved by more than 1 time, the favor of users is obtained, and the Mo-containing austenitic stainless steel welding strip has obvious market popularization value.
Detailed Description
The present invention will be described in detail with reference to the following embodiments for a full understanding of the objects, features, and effects of the present invention. The process of the present invention is carried out by methods or apparatus conventional in the art, except as described below. The following terms have the meanings commonly understood by those skilled in the art unless otherwise indicated.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values for the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range description features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to include any and all subranges subsumed therein.
The single-layer build-up welding achieves the effect of twice build-up welding, a great amount of work is required to be carried out on component design, the proportion of elements such as Cr, ni, mo and the like of materials, the ferrite content and the like are controlled, hot cracks are avoided when the build-up welding is solidified, and meanwhile, the problem of how to avoid cracking of a stainless steel welding strip in the smelting and continuous casting production process is considered, so that the component design and smelting production of the stainless steel welding strip are comprehensively considered.
Specifically, the Mo-containing austenitic stainless steel welding strip comprises the following components in percentage by weight: less than or equal to 0.020% of C, less than or equal to 0.2% of Si, less than or equal to 0.6% of Mn, less than or equal to 2.00% of P, less than or equal to 0.010% of S, less than or equal to 21.00% of Cr, less than or equal to 22.00% of 13.00% of Ni, less than or equal to 14.00% of 2.50% of Mo, less than or equal to 3.00% of 0.03% of N, less than or equal to 0.2% of Cu, and the balance of Fe and unavoidable impurities.
Preferably, the Mo-containing austenitic stainless steel welding strip comprises, by weight, 0.015% or less of C or less than 0.020%, 0.3% or less of Si or less than 0.5%, 1.50% or less of Mn or less than 2.00%, P or less than 0.020%, S or less than 0.010%, 21.00% or less of Cr or less than 21.50%, 13.50% or less of Ni or less than 14.00%, 2.60% or less of Mo or less than 2.90%, 0.04% or less of N or less than 0.05%, cu or less than 0.1% and the balance of Fe and unavoidable impurities.
The reasons for the limitation of the content range of the main alloying element will be explained below.
C is an austenite phase forming element, and in order to ensure that C of cladding metal after surfacing is less than or equal to 0.025%, C in a base metal is considered to enter the cladding metal, so that the C content of the cladding metal is improved, and in a component system of a stainless steel welding strip for surfacing, C cannot be higher than 0.020%. However, since C is an austenite forming element, too low a content of C may result in a decrease in austenite phase, an increase in ferrite content, and deterioration in the thermoplasticity of the steel, which is disadvantageous for subsequent hot rolling production. Meanwhile, in order to improve the strength of the cladding metal and increase the wear resistance of the cladding metal, a small amount of C is required to be added to be more than 0.01%, so that the high-temperature strength of the cladding metal is improved. Therefore, the C content is controlled below 0.020%, and the optimal range is 0.015-0.020%, so that the ferrite requirement can be ensured, the cracking can be avoided, the strength of the cladding metal can be ensured, and the wear resistance is improved.
Si is ferrite phase forming element, in order to ensure that the Si of cladding metal after surfacing is less than or equal to 1.0%, meanwhile, high Si is considered to cause solidification cracks, si in a stainless steel welding strip cannot be too high, meanwhile, si is considered to be a deoxidizer in a smelting process, so that the improvement of the purity of steel is greatly facilitated, meanwhile, the wettability of cladding metal in the surfacing process can be increased by Si, and the attractiveness of a welding line is improved. Therefore, the Si content is controlled to be 0.2% or less and 0.6% or less, and the optimum range is 0.3% or less and 0.5% or less.
Mn is an austenite phase forming element, and in order to ensure that Mn of cladding metal after surfacing is less than or equal to 2.00 percent, and meanwhile, the solubility of N element in steel can be improved by considering Mn, so that Mn is controlled according to the upper limit, namely Mn is more than or equal to 1.50 percent and less than or equal to 2.00 percent.
P, S is an easily segregated element whose solubility in the ferrite phase is much greater than its solubility in the austenite phase (e.g., P has a solubility in the ferrite phase of 2.8% and in the normal temperature austenite phase of only 0.025%). The P, S exceeding the solubility precipitates and forms low-melting-point eutectic crystals of Fe-FeS, ni-Ni3S2, ni-Ni3P and the like with Fe, ni and the like, the melting point of the eutectic crystals is 600-800 ℃, the melting point of the eutectic crystals is far lower than the melting point of austenite (1300-1360 ℃), and cracks are formed under the action of shrinkage stress in the later stage of solidification. The stainless steel welding strip is generally used as a harmful element, and the lower the control is, the better the control is, so that the control of P is less than or equal to 0.020 percent and S is less than or equal to 0.010 percent.
Cr is a strong ferrite forming element, can form a compact passivation film on the surface of stainless steel, prevents a matrix from being corroded, and is a main element for improving corrosion resistance of the stainless steel. In order to meet the requirement of cladding metal Cr between 17.5 and 19.5 percent, the Cr content in the stainless steel welding strip is between 21.00 and 23.00 percent in combination with the calculation of the dilution rate of the welding strip in the surfacing process and the burning loss in the surfacing process, and the ferrite content is increased by considering that Cr is too high, so that 21.00 to 22.00 percent is taken, and the optimal control is 21.00 to 21.50 percent.
Ni is a strong austenite forming element, and its main function is to form and stabilize an austenite structure, thereby providing steel with good plasticity and toughness, and improving the weldability of steel. In order to meet the requirement of cladding metal Ni of 11.00-15.00%, the Ni content in the stainless steel welding strip is between 13.00% and less than or equal to 14.00% in combination with calculation of the welding strip dilution rate and cost in the surfacing process, and the Ni content is optimally controlled to be between 13.50% and less than or equal to 14.00%.
Mo is a ferrite forming element, the main function of Mo is to increase the steel in a reducing medium (such as H 2 SO 4 ，H 3 PO 4 And some organic acids and urea environment) and is tunedHigh steel resistance to pitting corrosion and crevice corrosion. In order to meet the requirement of 2.00-3.00% of cladding metal Mo, the Mo content in the stainless steel welding strip is calculated to be 2.50% or less and 3.00% or less by combining the dilution rate and the cost of the welding strip in the surfacing process, and the Ni content is optimally controlled to be 2.60% or less and 2.90% or less.
Cu obviously reduces the hot workability of stainless steel, so in the stainless steel welding strip, cu is controlled to be less than or equal to 0.2 percent, and optimally Cu is controlled to be less than or equal to 0.1 percent.
N has advantages in saving precious metal, improving the strength of the material and improving the corrosion resistance by using nickel nitride, but excessive nitrogen reduces the hot workability of the material, and meanwhile, pores are easily formed by precipitation in the surfacing process, so that the control range of nitrogen is 0.03-0.08%, and optimally 0.04-0.05%.
In the Mo-containing austenitic stainless steel welding strip, the stability of a structure at high temperature is guaranteed through the synergistic effect between elements, and cracking of cladding metal in the overlaying process is avoided, so that the effect of primary twice overlaying can be achieved by performing one-time overlaying on the welding strip.
Furthermore, in order to ensure that the cladding metal does not generate microcracks after overlaying and has good structural stability, the ferrite content of the cladding metal should be ensured to be 3-8%, and according to the influence of the dilution rate in the overlaying process, the ferrite content of the stainless steel welding strip should be ensured to be 9-14%. When the ferrite content is less than 9%, the ferrite content of the cladding metal is possibly less than 3%, and the solidification crack risk exists in the surfacing process; when the ferrite content is greater than 14%, the clad metal is prone to "hydrogen stripping" (hydrogen enters the build-up layer under hydrogen-critical conditions, causing the build-up layer to strip off the substrate).
The ferrite content of the welding strip is calculated through a WRC-1992 formula, the ferrite content is calculated by inputting C, ni, N, cu, mn, si, cr, mo and the like, wherein C, ni, N, cu, mn is an austenite forming element, and Si, cr and Mo are ferrite forming elements.
On the other hand, the invention also provides a preparation method of the Mo-containing austenitic stainless steel welding strip, which comprises the following steps:
(1) Molten iron pretreatment, converter smelting, VOD furnace refining and LF furnace refining are carried out to obtain molten steel with qualified components;
(2) Continuously casting the molten steel to obtain a continuous casting plate blank;
(3) And grinding and heating the continuous casting slab, performing hot rolling, cold rolling and annealing, and splitting to obtain the Mo-containing austenitic stainless steel welding strip.
The main process parameters involved in the preparation method of the Mo-containing austenitic stainless steel ribbon of the present invention will be described in detail below, wherein processes not noted are performed according to the prior art.
Pretreatment of molten iron
The three-desilication treatment (desilication, dephosphorization and desulfurization) is carried out on the blast furnace molten iron, so that the molten iron P is less than or equal to 0.006wt% and the S is less than or equal to 0.025wt%.
Converter smelting
Adding ferromanganese, ferrochrome, nickel plates, ferromolybdenum and other alloys into a converter in batches, wherein [ P ] in the ferromanganese, ferrochrome, nickel plates, ferromolybdenum and other alloys is less than or equal to 0.020%, and high-quality auxiliary materials are selected to ensure the purity of the steel.
Wherein, the high quality auxiliary materials include: mold flux, tundish covering agent, tundish nozzle, etc.
Alloy elements are added to a proper range as much as possible in a converter, and the alloy adjustment components are added as little as possible in an LF furnace.
Refining in VOD furnace
In the refining process of the VOD furnace, the vacuum degree of the VOD furnace is controlled to be less than 2mbar, the furnace feeding temperature is more than or equal to 1620 ℃, thereby realizing the aims of rapid decarburization and denitrification and improving the refining efficiency.
The carbon content in the molten iron is removed to below 0.015wt% by oxygen blowing.
LF furnace refining
To ensure ferrite contents between 9-14%, fine tuning of the composition is required. Adding high-carbon ferrochrome to adjust the carbon content, blowing nitrogen into an LF furnace to increase nitrogen, increasing nickel on a nickel plate, and the like.
Before weak stirring, ca-Si wire is fed at the speed of 4m/t for further deoxidization, and Fe-B is added according to the molten steel amount of 0.3Kg/t, so that the hot workability of the steel billet is improved.
The outlet temperature of the LF furnace is controlled at 1500-1510 ℃.
Continuous casting of slabs
And (3) adopting a continuous casting machine to carry out continuous casting, wherein the specification of a continuous casting slab is 200 multiplied by 1240mm, blowing argon into a crystallizer for 5min before casting, and discharging air to prevent molten steel from being oxidized.
The casting temperature is controlled between 1450 and 1480 ℃ and the pulling speed is controlled between 0.9 and 1.1mm/min in the continuous casting process, so that casting is strictly protected and secondary oxidation of molten steel is prevented.
And the electromagnetic stirring is put into the casting blank to improve the structure of the casting blank and the hot workability.
Through detection, the equiaxed crystal proportion of the casting blank is more than 60%, the casting blank has good thermoplasticity, and the edge cracking in the hot rolling and coiling process is effectively avoided. And the surface quality of the casting blank is good, so that the surface quality of the steel belt is good after the cold rolling is finished.
Grinding of casting blank
Grinding the casting blank by adopting a grinding wheel, wherein the grinding rate is 2-3.5%.
Heating of cast blanks
Heating the casting blank in a heating furnace, controlling the temperature to be 1200-1260 ℃ and keeping the temperature for 180-220min, so that the casting blank is softened and uniformly burnt.
Casting blank hot rolling
The hot rolling is carried out in a hot continuous rolling mode to roll into a coil, the thickness of the hot coil is 2.5-3.0mm, and the large-deformation rapid rolling is adopted, wherein the final rolling temperature is more than or equal to 1030 ℃, so that the edge cracking of the steel strip in the hot rolling process is avoided.
The large-deformation rapid rolling is a process of rolling a continuous casting billet with the thickness of 200mm into a steel strip with the thickness of 2.5-3mm by adopting 5-pass rough rolling and 7-pass finish rolling.
Hot coil cold rolling
And (3) rolling the hot coil by adopting a twenty-high rolling mill, and rolling the thickness of the steel plate from 2.5-3.0mm to 0.4-0.5mm of the thickness of the finished product, thereby ensuring the quality of the plate shape.
Wherein, the rate of the last cold-hard rolling Cheng Bianxing is controlled to be 45-50%, the steel strip is not annealed, the steel strip is ensured to be in a semi-hard state, and the method is suitable for a long-distance surfacing process.
Annealing of cold rolls
Annealing temperature is 1060-1100 ℃, and heat preservation time is 0.3-0.7min.
Slitting
The steel coil is striped according to the width requirement of a user, the precision control of tool setting is paid attention to, and the burr of the finished product is ensured to be less than or equal to 5 percent.
In some preferred embodiments, the main process route of the present invention is, if solid solution delivery: molten iron pretreatment, converter, VOD furnace, LF furnace, slab continuous casting, casting blank grinding, casting blank heating, hot continuous rolling, hot wire solution treatment, cold rolling, cold wire solution treatment, parting and the like.
In still other preferred embodiments, the main process route of the present invention is, if semi-chilled delivery: molten iron pretreatment, converter, VOD furnace, LF furnace, slab continuous casting, casting blank grinding, casting blank heating, hot continuous rolling, hot wire solution treatment, cold rolling, cold wire solution treatment, cold rolling, parting and the like.
The Mo-containing austenitic stainless steel welding strip prepared by the method has good surface quality of the cold plate, meets the requirements of performance, achieves the original twice overlaying effect after monolayer overlaying by a user, and greatly improves the overlaying production efficiency.
Examples
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods without specific conditions noted in the following examples follow conventional methods and conditions. The starting materials used in the following examples are all conventionally commercially available.
Example 1
For the user order steel grade TEQ309LMo, 0.4X50 (mm), solid solution state.
The design process route comprises molten iron pretreatment, a 90-ton converter, a VOD furnace, an LF furnace, slab continuous casting, casting blank grinding, casting blank heating, hot continuous rolling, hot wire solution treatment, cold rolling, cold wire solution treatment, parting and the like. Mainly comprises the following steps:
(1) And (3) molten iron pretreatment: three-desilication treatment (desilication, dephosphorization and desulfurization) is carried out on 45 tons of blast furnace molten iron, and the molten iron P is measured: 0.005%, S:0.020%.
(2) Adding alloy into a converter: 2.1 ton ferromanganese (Mn: 80-87%, C:0.2%, P: 0.10%), 29 ton ferrochrome (Cr: 62-72%, C:6%, P: 0.018%), 12.2 ton nickel plate (Ni: 99%), 3.5 ton ferromolybdenum (Mo: 65-75%, C:0.10%, P: 0.05%) and the like are added in batches, and decarburized by oxygen blowing, wherein the C content is reduced from 0.788% to 0.224%.
The chemical components after tapping of the converter are as follows by mass percent:
c:0.224%; si:0.159%; mn:1.6123%; p:0.0146%; s: 0.01334%; cr:21.23%; ni:13.4553%; mo:2.6234.00%; cu:0.0113%; n:0.1994%; the balance of Fe and unavoidable impurities
VOD refining: the VOD furnace vacuum degree is 1.5mbar, the furnace temperature is 1635 ℃, and the carbon content is removed to be below 0.015 percent by oxygen blowing.
The chemical components after tapping in the VOD furnace are as follows by mass percent:
c:0.0064%; si:0.3308%; mn:1.7327%; p:0.015%; s:0.0021%; cr:21.0684%; ni:13.4146%; mo:2.6715%; cu:0.012%; n:0.0209%; the balance of Fe and unavoidable impurities. Ferrite number FN:17.7%.
Refining in an LF furnace: to ensure ferrite contents between 9-14%, fine tuning of the composition is required. Adding high-carbon ferrochrome to adjust the carbon content, blowing nitrogen into an LF furnace to increase nitrogen, increasing nickel on a nickel plate, and the like. Feeding Ca-Si wire 4m/t before weak stirring, adding Fe-B in the amount of 0.3Kg/t molten steel, and controlling the outlet temperature at 1503 ℃.
The steel tapping chemical composition of the LF furnace comprises the following components in percentage by mass:
c:0.0184%; si:0.3402%; mn:1.8143%; p: 0.016; s:0.001%; cr:21.1022%; ni:13.5121%; mo:2.6117%; cu:0.010%; n:0.0459%; the balance of Fe and unavoidable impurities. Ferrite number FN:12.6%.
(5) Continuous slab casting: the specification of the continuous casting slab is 200 multiplied by 1240mm, the casting temperature is 1455-1465 ℃, and the pulling speed is controlled to be 1.0mm/min. The low power of the casting blank shows 65% of equiaxed crystal.
(6) Grinding a casting blank: grinding by adopting a grinding wheel, wherein the grinding rate is 2.0%.
(7) Heating a casting blank: heating the casting blank in a heating furnace, controlling the temperature to 1220 ℃, and preserving the heat for 200min.
(8) And (3) hot rolling casting blanks: the hot rolling adopts a hot continuous rolling mode to roll into a coil, the thickness of the hot coil is 2.5mm, the large deformation rapid rolling is adopted, and the final rolling temperature is 1035 ℃.
(9) Cold rolling of hot coil: the twenty-roller rolling is adopted, the thickness of the finished product is 0.4mm from 2.5mm, and the plate type quality is ensured.
(10) And (3) cold roll annealing: annealing temperature is 1080 ℃, and heat preservation time is 0.5min.
(11) Splitting: the steel coil is striped according to the width requirement of 50mm, and the burrs of the finished product are ensured to be less than or equal to 5 percent.
The produced cold plate has good surface quality and performance meeting the requirements, achieves the original twice overlaying effect after single-layer overlaying by a user, and greatly improves the production efficiency.
Example 2
For the user order steel grade TEQ309LMo,0.5 x 60 (mm), semi-chilled.
The design process route comprises molten iron pretreatment, 90 ton converter, VOD furnace, LF furnace, slab continuous casting, casting blank grinding, casting blank heating, hot continuous rolling, hot wire solution treatment, cold rolling, cold wire solution treatment, cold rolling, parting and the like. Mainly comprises the following steps:
(1) And (3) molten iron pretreatment: performing three-desilication treatment (desilication, dephosphorization and desulfurization) on 46 tons of blast furnace molten iron, and measuring the molten iron P:0.006%, S:0.018%.
(2) Adding alloy into a converter: 2.2 tons of ferromanganese (Mn: 80-87%, C:0.21%, P: 0.11%), 30 tons of ferrochrome (Cr: 62-72%, C:6%, P: 0.019%), 12.4 tons of nickel plate (Ni: 99%), 3.7 tons of ferromolybdenum (Mo: 65-75%, C:0.09%, P: 0.04%) and the like are added in batches, and decarburized by oxygen blowing, wherein the C content is reduced from 0.543% to 0.215%.
The chemical components after tapping of the converter are as follows by mass percent:
c:0.215%; si:0.143%; mn:1.7576%; p:0.0133%; s:0.0144%; cr:21.22%; ni:13.4655%; mo:2.6124.00%; cu:0.0112%; n:0.1476%; the balance of Fe and unavoidable impurities.
(3) VOD refining: the VOD furnace vacuum degree is 1.4mbar, the furnace temperature is 1637 ℃, and the carbon content is removed to be below 0.015 percent by oxygen blowing.
The chemical components after tapping in the VOD furnace are as follows by mass percent:
c:0.0077%; si:0.3422%; mn:1.7623%; p:0.014%; s:0.0011%; cr:21.2333%; ni:13.4765%; mo:2.6261%; cu:0.0113%; n:0.0243%; the balance of Fe and unavoidable impurities. Ferrite number FN:17.5%.
(4) Refining in an LF furnace: to ensure ferrite contents between 9-14%, fine tuning of the composition is required. Adding high-carbon ferrochrome to adjust the carbon content, blowing nitrogen into an LF furnace to increase nitrogen, increasing nickel on a nickel plate, and the like. Before weak stirring, ca-Si wire 4m/t is fed, fe-B is added according to the molten steel amount of 0.3Kg/t, and the outlet temperature is controlled at 1505 ℃.
The steel tapping chemical composition of the LF furnace comprises the following components in percentage by mass:
c:0.0185%; si:0.3411%; mn:1.8290%; p:0.014%; s:0.001%; cr:21.2222%; ni:13.5347%; mo:2.6674%; cu:0.0111%; n:0.0476%; the balance of Fe and unavoidable impurities. Ferrite number FN:13.2%.
(5) Continuous slab casting: the specification of the continuous casting slab is 200 multiplied by 1240mm, the casting temperature is 1458-1467 ℃, and the pulling speed is controlled to be 1.0mm/min. The low power of the casting blank shows 65% of equiaxed crystal.
(6) Grinding a casting blank: grinding by adopting a grinding wheel, wherein the grinding rate is 2.0%.
(7) Heating a casting blank: heating the casting blank in a heating furnace, controlling the temperature to 1220 ℃, and preserving the heat for 200min.
(8) And (3) hot rolling casting blanks: the hot rolling adopts a hot continuous rolling mode to roll into a coil, the thickness of the hot coil is 3.0mm, the large deformation rapid rolling is adopted, and the final rolling temperature is 1038 ℃.
(9) Cold rolling of hot coil: the twenty rollers are adopted for rolling, the thickness is 0.95mm from 3.0mm to the middle, and the plate type quality is ensured.
(10) And (3) cold roll annealing: annealing temperature is 1080 ℃, and heat preservation time is 0.5min.
(11) Cold rolling: rolling from 0.95mm thickness to 0.5mm thickness, and cold rolling deformation rate is 47%.
(12) Splitting: the steel coil is striped according to the width requirement of 60mm, and the burrs of the finished product are ensured to be less than or equal to 5 percent.
The produced cold plate has good surface quality and performance meeting the requirements, achieves the original twice overlaying effect after single-layer overlaying by a user, and greatly improves the production efficiency.
The present invention has been disclosed above in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to those of the embodiments are considered to be covered by the scope of the claims of the present invention. The scope of the invention should, therefore, be determined with reference to the appended claims.
Claims (10)
1. An austenitic stainless steel welding strip containing Mo, which is characterized by comprising the following components in percentage by weight: less than or equal to 0.020% of C, less than or equal to 0.2% of Si, less than or equal to 0.6% of Mn, less than or equal to 2.00% of P, less than or equal to 0.010% of S, less than or equal to 21.00% of Cr, less than or equal to 22.00% of 13.00% of Ni, less than or equal to 14.00% of 2.50% of Mo, less than or equal to 3.00% of 0.03% of N, less than or equal to 0.2% of Cu, and the balance of Fe and unavoidable impurities.
2. The Mo-containing austenitic stainless steel ribbon according to claim 1, characterized by comprising, in weight percent: 0.015% or less of C or less than 0.020%, 0.3% or less of Si or less than 0.5%, 1.50% or less of Mn or less than 2.00%, P or less than 0.020%, S or less than 0.010%, 21.00% or less of Cr or less than 21.50%, 13.50% or less of Ni or less than 14.00%, 2.60% or less of Mo or less than 2.90%, 0.04% or less of N or less than 0.05%, cu or less than 0.1% and the balance of Fe and unavoidable impurities.
3. Mo-containing austenitic stainless steel welding strip according to claim 1 or 2, characterized in that the ferrite number FN in the Mo-containing austenitic stainless steel welding strip is 9-14%.
4. A method of producing a Mo-containing austenitic stainless steel ribbon according to any one of claims 1 to 3, characterized by comprising:
(1) Molten iron pretreatment, converter smelting, VOD furnace refining and LF furnace refining are carried out to obtain molten steel with qualified components;
(2) Continuously casting the molten steel to obtain a continuous casting plate blank;
(3) And grinding and heating the continuous casting slab, performing hot rolling, cold rolling and annealing, and splitting to obtain the Mo-containing austenitic stainless steel welding strip.
5. The method for producing a Mo austenitic stainless steel ribbon according to claim 4, wherein in the refining process of the VOD furnace, the vacuum degree of the VOD furnace is less than 2mbar, the furnace feeding temperature is not less than 1620 ℃, and the carbon content is removed to below 0.015wt% by oxygen blowing.
6. The method for producing an austenitic stainless steel strip containing Mo according to claim 4, wherein in the refining in the LF furnace, ca-Si wire is fed at a speed of 4m/t while Fe-B is added in an amount of 0.3Kg/t molten steel before weak stirring, and the outlet temperature is controlled at 1500-1510 ℃.
7. The method for producing a Mo austenitic stainless steel strip according to claim 4, wherein argon is blown into the mold for 5min before casting in the continuous casting process, the casting temperature is 1450-1480 ℃, and the drawing speed is controlled to be 0.9-1.1mm/min.
8. The method for producing a Mo-containing austenitic stainless steel ribbon according to claim 4, wherein the heating temperature of the continuously cast slab is 1200-1260 ℃ and the holding time is 180-220min.
9. The method for producing a Mo-containing austenitic stainless steel strip according to claim 4, wherein the final rolling temperature of hot rolling is not less than 1030 ℃, and the rate of the last rolling Cheng Bianxing of cold rolling is controlled to 45-50%; the annealing temperature is 1060-1100 ℃, and the heat preservation time is 0.3-0.7min.
10. Use of the Mo containing austenitic stainless steel weld strip according to any of the claims 1 to 9 in single layer build up welding.
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| JPH03110097A (en) * | 1989-09-22 | 1991-05-10 | Kobe Steel Ltd | Wire for welding austenitic stainless steel |
| CN103205655A (en) * | 2013-03-21 | 2013-07-17 | 宝钢不锈钢有限公司 | Sn-containing austenitic stainless steel and manufacturing method thereof |
| CN103526131A (en) * | 2013-10-31 | 2014-01-22 | 万宝力不锈钢制品（东莞）有限公司 | High-strength stainless steel coffee pot material and preparation method thereof |
| CN109514126A (en) * | 2018-11-06 | 2019-03-26 | 哈尔滨威尔焊接有限责任公司 | A kind of molybdenum stainless steel welding and preparation method thereof, sintered flux and preparation method thereof and a kind of single layer strip electrode electroslag surfacing method |
| CN115922144A (en) * | 2022-12-13 | 2023-04-07 | 振石集团华智研究院(浙江)有限公司 | Austenitic stainless steel welding wire and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03110097A (en) * | 1989-09-22 | 1991-05-10 | Kobe Steel Ltd | Wire for welding austenitic stainless steel |
| CN103205655A (en) * | 2013-03-21 | 2013-07-17 | 宝钢不锈钢有限公司 | Sn-containing austenitic stainless steel and manufacturing method thereof |
| CN103526131A (en) * | 2013-10-31 | 2014-01-22 | 万宝力不锈钢制品（东莞）有限公司 | High-strength stainless steel coffee pot material and preparation method thereof |
| CN109514126A (en) * | 2018-11-06 | 2019-03-26 | 哈尔滨威尔焊接有限责任公司 | A kind of molybdenum stainless steel welding and preparation method thereof, sintered flux and preparation method thereof and a kind of single layer strip electrode electroslag surfacing method |
| CN115922144A (en) * | 2022-12-13 | 2023-04-07 | 振石集团华智研究院(浙江)有限公司 | Austenitic stainless steel welding wire and preparation method thereof |
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