CN103255352B - Method for improving and forming austenite in ultra-low carbon austenitic stainless steel bar - Google Patents
Method for improving and forming austenite in ultra-low carbon austenitic stainless steel bar Download PDFInfo
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- CN103255352B CN103255352B CN201310137061.8A CN201310137061A CN103255352B CN 103255352 B CN103255352 B CN 103255352B CN 201310137061 A CN201310137061 A CN 201310137061A CN 103255352 B CN103255352 B CN 103255352B
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Abstract
The invention provides a method for improving and forming austenite in an ultra-low carbon austenitic stainless steel bar and belongs to the field of metallurgy. The ultra-low carbon austenitic stainless steel bar is made of 022Cr19Ni10 steel or 022Cr17Ni12Mo2 steel; and according to the method, the equivalent weight of Cr/the equivalent weight of Ni is set as 1.40-1.90 in a stainless steel smelting technological link, and the nitrogen content is 600-800PPm in the smelting process, wherein the equivalent weight of Cr is equal to Cr plus 1.5Si plus Mo plus 0.5Nb, and the equivalent weight of Ni is equal to Ni plus 30(C+N) plus 0.5Mn. The detection values of the product produced by the method are in line with requirements. Compared with the conventional ultra-low carbon austenitic stainless steel bar, the ultra-low carbon austenitic stainless steel bar has the advantages that the tensile strength is increased by 10N/mm<2>, and the hardness is increased by 15HBW. The method has the advantages that the performance is ensured, the production cost is also reduced, the consumption of nickel alloy is reduced, and the consumption of nickel can be reduced by 0.8%-1.1%.
Description
Technical field
The invention belongs to smelter stainless steel production field, described ultra-low carbon austenitic stainless steel bar refers to 022Cr19Ni10 and 022Cr17Ni12Mo2.
Background technology
Current steel-making enterprise adopts the method increasing nickel content to improve in steel and forms the Ovshinsky scale of construction.This method cost is high.
Along with the proposition of the new concept such as resource-conserving, recycle, and in market competition, low cost, high-quality product will occupy leading and advantage.
Summary of the invention
In order to reduce production cost, the present invention proposes to improve in a kind of ultra-low carbon austenitic stainless steel bar of low cost to form austenitic method, it can stablize the formation of the Ovshinsky scale of construction in ultra-low carbon austenitic stainless steel, improves intensity and the hardness value of ultra-low carbon austenitic stainless steel bar.
Technical scheme of the present invention is: ultra-low carbon austenitic stainless steel bar of the present invention is 022Cr19Ni10 steel or 022Cr17Ni12Mo2 steel;
Described 022Cr19Ni10 steel, element mass percent is C is≤0.025, Si be 0.20-0.70, Mn is 1.55-1.95, P≤0.035, S≤0.005, Cr be 18.00-18.60, Ni are that 8.00-8.50, Mo are≤0.50, N is 0.060-0.080, and all the other be iron and inevitable impurity.Its tensile strength Rm is 520-615 N/mm
2; Hardness HBW is 158-180.
022Cr17Ni12Mo2 steel of the present invention, element mass percent is C is≤0.025, Si be 0.20-0.70, Mn is 1.00-1.50, P≤0.035, S≤0.005, Cr be 16.50-17.00, Ni be 10.00-10.50, Mo be 2.00-2.50, N are 0.060-0.080, and all the other are iron and inevitable impurity.Its tensile strength Rm is 481-719 N/mm
2; Hardness HBW is 145-175.
In stainless steel-making process link, setting Cr equivalent/Ni equivalent=1.40 ~ 1.90, in smelting process, nitrogen content is 600-800PPm; Wherein Cr equivalent=Cr+1.5Si+ Mo+0.5Nb; Ni equivalent=Ni+30(C+N)+0.5Mn;
Above-mentioned calculation formula is Cr equivalent and the Ni equivalent calculation formula of Delong figure in stainless steel-special steel book series.
The Product checking value that the present invention produces all meets the requirements, and compared with existing ultra-low carbon austenitic stainless steel bar, tensile strength adds 10 N/mm
2, hardness adds 15HBW.The present invention both ensure that performance again reduced production cost, had saved nickelalloy consumption, can reduce nickel 0.8-1.1%.
Embodiment
Embodiment one: 022Cr17Ni12Mo2 steel, its element mass percent is C is 0.015, Si is 0.50, Mn is 1.20, P is 0.015, S is 0.003, Cr is 16.82, Ni is 10.23, Mo is 2.11, N is 0.068, and all the other are iron and inevitable impurity; Adopt omnidistance nitrogen flushing, comprise successively:
Preprocessed molten iron, K-OBM-S converter smelting, the refining of VOD and LF stove, wherein:
Preprocessed molten iron: P≤0.010%, S≤0.025%, T >=1230 DEG C, ladle band quantity of slag < 0.3t;
Bottom blowing nitrogen control 15-22N/cm in K-OBM-S stainless steel smelting process
2, flow presses 30-35m
3, controlled N:400-700PPm;
VOD oxygen blast terminates rear boiling time>=10min, vacuum tightness≤3mbar continuous hold-time>=5min, carry out omnidistance bottom blowing nitrogen control 10-12N/cm
2, flow presses 20-25m
3, N:600-800PPm;
LF stove: feed silico-calcium (containing Ca:28%) (or pure calcium line conversion for the silicon-calcium wire) weak churning time >=10min of 3-4m/t BOTTOM ARGON BLOWING and molten steel is not exposed, N:600-800PPm.
Embodiment two: 022Cr17Ni12Mo2 steel, its element mass percent is C is 0.018, Si is 0.45, Mn is 1.28, P is 0.013, S is 0.004, Cr is 16.78, Ni is 10.25, Mo is 2.14, N is 0.075, and all the other are iron and inevitable impurity.Other is identical with embodiment one.
Embodiment three: 022Cr19Ni10 steel, element mass percent is C is 0.010, Si is 0.43, Mn is 1.86, P is 0.013, S is 0.003, Cr is 18.23, Ni is 8.25, Mo is 0.25, N is 0.066, and all the other are iron and inevitable impurity.
Process for making adopts EBT electrosmelting, AOD furnace, the refining of LF refining furnace, wherein,
EBT electric furnace: Composition Control (%) Cr:16.0-19.0 P≤0.028 Cu≤0.18% in bag, station of skimming after electric furnace steel tapping scratches clean slag, in bag slag thick≤50mm.Process only has melting period and oxidation period not to have reduction period without in argon-blowing device EBT electric furnace process, cannot carry out Argon.
AOD furnace: AOD furnace omnidistance nitrogen flushing 16-23 N/cm
2, flow presses 32-38m
3, before tapping, control Argon total amount 18-21m
3/ t, guarantees that nitrogen content enters 600-800PPm.
LF stove:, feed CaSi line 4m/t, omnidistance BOTTOM ARGON BLOWING is blown >=5 minutes (flow 50-250NL/min) firmly; Soft blow >=10 minute (flow 20-50NL/min), in whipping process, molten steel must not be exposed.
embodiment four: 022Cr19Ni10 steel, element mass percent is C is 0.015, Si is 0.40, Mn is 1.80, P is 0.018, S is 0.002, Cr is 18.15, Ni is 8.20, Mo is 0.30, N is 0.07, and all the other are iron and inevitable impurity; Other is identical with embodiment one.
Claims (4)
1. improve in ultra-low carbon austenitic stainless steel bar and form an austenitic method, ultra-low carbon austenitic stainless steel bar is 022Cr19Ni10 steel or 022Cr17Ni12Mo2 steel; In stainless steel-making process link, in smelting process, nitrogen content is 600-800PPm; Wherein Cr equivalent=Cr+1.5Si+ Mo+0.5Nb; Ni equivalent=Ni+30(C+N)+0.5Mn; It is characterized in that Cr equivalent/Ni equivalent=1.40 ~ 1.90; Described 022Cr17Ni12Mo2 steel, element mass percent is C is≤0.025, Si be 0.20-0.70, Mn is 1.00-1.50, P≤0.035, S≤0.005, Cr be 16.50-17.00, Ni be 10.00-10.50, Mo be 2.00-2.50, N are 0.060-0.080, and all the other are iron and inevitable impurity; Its tensile strength Rm is 481 ~ 719 N/mm
2; Hardness HBW is 145 ~ 175.
2. improve in a kind of ultra-low carbon austenitic stainless steel bar according to claim 1 and form austenitic method, it is characterized in that stainless steel-making process adopts EBT electrosmelting, AOD furnace, the refining of LF refining furnace, wherein, EBT electric furnace: smelting process only has melting period and oxidation period not to have reduction period, not Argon, and in ladle, Composition Control scope is Cr:16.0 ~ 19.0, P≤0.028, Cu≤0.18%, station of skimming after electric furnace steel tapping scratches clean slag, in bag slag thick≤50mm; AOD furnace: omnidistance nitrogen flushing 16 ~ 23 N/cm of AOD furnace
2, flow is by 32 ~ 38m
3, before tapping, control Argon total amount 18 ~ 21m
3/ t, guarantees that nitrogen content enters 600 ~ 800PPm; LF stove: feed CaSi line 4m/t, omnidistance BOTTOM ARGON BLOWING blows firmly>=and 5 minutes; Flow 50 ~ 250NL/min; Soft blow>=10 minute, flow 20-50NL/min, in whipping process, molten steel must not be exposed.
3. improve in a kind of ultra-low carbon austenitic stainless steel bar according to claim 1 and form austenitic method, it is characterized in that described 022Cr19Ni10 steel, element mass percent is≤0.025, Si be 0.20-0.70, Mn is 1.55-1.95, P≤0.035, S≤0.005, Cr be 18.00-18.60, Ni are that 8.00-8.50, Mo are≤0.50, N is 0.060-0.080,, all the other are iron and inevitable impurity; Its tensile strength Rm is 520 ~ 615 N/mm
2; Hardness HBW is 158 ~ 180.
4. improve in a kind of ultra-low carbon austenitic stainless steel bar according to claim 3 and form austenitic method, it is characterized in that stainless steel-making process adopts omnidistance nitrogen flushing, comprise successively: preprocessed molten iron, K-OBM-S converter smelting, the refining of VOD and LF stove, wherein: preprocessed molten iron: P≤0.010%, S≤0.025%, T>=1230 DEG C, ladle band quantity of slag < 0.3t; Bottom blowing nitrogen control 15-22N/cm in K-OBM-S converter steelmaking process
2, flow presses 30-35m
3, controlled N:400-700PPm; VOD oxygen blast terminates rear boiling time>=10min, vacuum tightness≤3mbar continuous hold-time>=5min, carry out omnidistance bottom blowing nitrogen control 10-12N/cm
2, flow presses 20-25m
3, N:600-800PPm; LF stove: the silico-calcium 3-4m/t being fed with calcium 28%, the weak churning time>=10min of BOTTOM ARGON BLOWING and molten steel is not exposed, N:600-800PPm.
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| CN110468348B (en) * | 2019-09-16 | 2022-04-29 | 无锡市法兰锻造有限公司 | 022Cr19Ni10 stainless steel flange for nuclear power station and manufacturing method thereof |
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