CN102312175B - Method for manufacturing stainless steel plate used for thermonuclear fusion reactor - Google Patents

Method for manufacturing stainless steel plate used for thermonuclear fusion reactor Download PDF

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Publication number
CN102312175B
CN102312175B CN2011101844668A CN201110184466A CN102312175B CN 102312175 B CN102312175 B CN 102312175B CN 2011101844668 A CN2011101844668 A CN 2011101844668A CN 201110184466 A CN201110184466 A CN 201110184466A CN 102312175 B CN102312175 B CN 102312175B
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molten steel
steel
nitrogen
molten
plate
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CN102312175A (en
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刘承志
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Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5264—Manufacture of alloyed steels including ferro-alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C22/00—Alloys based on manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/04—Alloys based on tungsten or molybdenum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/06—Alloys based on chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C28/00—Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21B—FUSION REACTORS
    • G21B1/00—Thermonuclear fusion reactors
    • G21B1/11—Details
    • G21B1/17—Vacuum chambers; Vacuum systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/10—Nuclear fusion reactors
    • 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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  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention relates to a method for manufacturing a stainless steel plate used for a thermonuclear fusion reactor, which comprises the following steps: I raw materials is prepared; II equipment is smelted: molten iron, chromium iron, nickel plate, manganese iron, ferrosilicon and molybdenum iron are added into an electric furnace or a converter for fusing and dumping into a VOD furnace to fuse, the molten steel is reduced and then nitrogen is blown according to the amount in a formula (1); wherein in the formula of Y=2.5*f*X*t: X denotes nitrogen flow blown into the molten steel, the unit is liter/minute.ton; t denotes nitrogen blowing time, the unit is minute; f denotes coefficient, the value range is 0.60-1.0; Y denotes increased value of nitrogen content required by the product, ppm; III steel is tapped when the mass percentage of the molten steel by LF treatment process meets the requirement; IV the steel ingot or continuous casting slab is cast after the tapping; V the steel plate is rolled along the width direction by a hot rolling process, and then the steel plate is rotated for 90 degrees and then rolled along the other direction. According to the invention, the stainless steel plate has small variation on tensile strength of vertical and transversal direction and small difference on elongation performance.

Description

A kind of thermonuclear fusion heap manufacture method of stainless steel plate
Technical field
The present invention relates to a kind of thermonuclear fusion heap (comprising experimental reactor) manufacture method of stainless steel plate.
Background technology
Thermonuclear fusion is the advanced Nuclear Power technology, wherein ITER (the international thermonuclear fusion heap of International Thermonuclear Experimental Reactor) is the novel fusion nuclear power experimental plan of European Union, the U.S., China, Japan, Russia, India, seven countries and regions' participation of Korea S, the stainless-steel sheet specification of quality of its demand is very high, adopt the steel plate of existing fabrication process, 1) Co, Nb, Ti element are difficult to satisfy the ITER claimed range in the molten steel, and wherein products C o content is generally more than 0.10%; 2) adopt nitro-alloy to increase the molten steel nitrogen content, such as nitrogenize ferromanganese, nitrided ferro-chromium, can increase foreign substance in molten steel content, the A in the product, B, C, D type (thick, thin) inclusion all are difficult to reach respectively 0 grade-1.5 grades, and inclusion total amount rank is difficult to be controlled at 0 grade-6 grades; 3) hot-rolled steel sheet greater than 15%, generally can reach for 40% (representing to represent along rolling direction with directions X perpendicular to rolling direction with Y-direction) along the tensile strength of rolling direction and vertical rolling direction, elongation characteristics otherness.There is very large difference in common product in tensile strength, the elongation characteristics of X, Y-direction: the value of [(directions X performance-Y-direction performance) ÷ directions X performance] * 100% is more than or equal to 15%, generally about 40%, make its product when all directions are stressed, security reduces greatly, affects product and uses.
Summary of the invention
Use the above-mentioned deficiency of the manufacture method of stainless steel plate in order to overcome existing thermonuclear fusion heap, the invention provides a kind of stainless steel plate manufacture method for the thermonuclear fusion heap, the stainless steel plate that present method is made is less along tensile strength, the elongation characteristics otherness of rolling direction and vertical rolling direction.
Thermonuclear fusion heap (the ITER plan belongs to experimental reactor project of thermonuclear fusion heap) with the weight percent of stainless steel plate material composition is:
0＜C≤0.08%; 0＜Si≤0.75%; 0＜Mn≤2.00%; P≤0.03%; S≤0.01%; Cr 16.00%-22.50%; Ni 8.00%-14.00%; Mo 0.01%-3.00%; 0＜Co≤0.10%; N 0.01%-0.25%; 0＜Nb≤0.10%; 0＜Ta≤0.10%; All the other are Fe and inevitable impurity.
Thermonuclear fusion heap stainless steel plate specification limit: (6-60) * (1500-3100) * (4000-12000) mm.
For three deficiencies of existing thermonuclear fusion heap with the manufacture method of stainless steel plate, the present invention mainly by smelting, operation of rolling technological design, has improved above deficiency.
This thermonuclear fusion heap comprises following step successively with the manufacture method of stainless steel plate:
I prepares raw material: take molten iron, ferrochrome, nickel plate, ferromanganese, ferrosilicon and molybdenum-iron as raw material.Wherein the nickel plate requires Co content: 0＜Co≤0.5%; The P requirement is in the molten iron: P≤0.03%.
Molten iron, ferrochrome, nickel plate, ferromanganese, ferrosilicon are the compositions that makes the molten steel of smelting with the weight proportion of molybdenum-iron, meet thermonuclear fusion heap with the requirement of the weight percent of iron, chromium, nickel, manganese, silicon and molybdenum in the stainless steel plate.
II smelting equipment, technique:
Adopt VOD stainless steel smelting equipment to smelt by stainless steel-making process, smelt any smelting that method, converter+VOD and electric furnace+AOD+VOD smelts method with electric furnace+VOD.
After smelting in molten iron, ferrochrome, nickel plate, ferromanganese, ferrosilicon and molybdenum-iron adding electric furnace or the converter, pour in the VOD stove and smelt, carbon period top blast oxygen 3-10m 3/ t molten steel, bottom blowing nitrogen flow 〉=5L/mint molten steel; Decarburization is complete, bottom blowing nitrogen flow 〉=10L/mint, stirring 〉=10min; Adding ferrosilicon (mainly be the raw material of reduction, enter molten steel silicone content about 0.4%) 3-10kg/t molten steel, lime 3-25kg/t molten steel reduce, and by (1) formula bottom blowing nitrogen amount, control the molten steel nitrogen increased amount after the reduction.
Y＝2.5×f×X×t (1)
In the formula: X---be blown into the molten steel nitrogen flow, unit liter/min clock ton;
T---the nitrogen blowing time, unit minute;
F---coefficient, span 0.60-1.0;
Y---product needed increases nitrogen content value, ppm (1,000,000/).
III LF treatment process:
Molten steel is entered furnaceman LF position, adjust liquid steel temperature by LF stove heated by electrodes, before going out LF stove processing station, add aluminium, the add-on of molten steel per ton is 0.3-1.5kg (generally adds aluminum shot (piece) or feeding aluminum steel 0.3-1.5kg/t (molten steel), perhaps add the aluminium powder of 0.3-1.5kg/t (molten steel) at the top of the slag); By the nitrogen flushing amount in 1 liter of-2 liter/mins of clock ton nitrogen blowing 〉=after 2 minutes; Add 0.3-2.0 kg/tonne of molten steel of Ca-Si line, again by 1 liter of-2 liter/mins of clock ton nitrogen blowing of nitrogen flushing amount 〉=2 minutes.The tapping when mass percent of the composition of molten steel reaches following the requirement:
0＜C≤0.08%; 0＜Si≤0.75%; 0＜Mn≤2.00%; P≤0.03%; S≤0.01%; Cr 16.00%-22.50%; Ni 8.00%-14.00%; Mo 0.01%-3.00%; 0＜Co≤0.10%; N 0.01%-0.25%; 0＜Nb≤0.10%; 0＜Ta≤0.10%; All the other are Fe and inevitable impurity.
IV steel tapping casting steel ingot or continuously cast bloom.
Slab requires:
(the finished product require width-raw material width of plate slab) * 100%/width of plate slab is controlled at 30%-100%.
The V hot rolling technology:
Slab heating temperature 1230-1310 ℃; The heat-up time 〉=(slab thickness numerical value mm * 1 minute) control.
Slab rolling: be rolled by steel plate is extended along width (Y-direction) first, width of plate slab after rolling and product requirement width phase difference are at 15 millimeters---in the time of 80 millimeters, (width of plate slab is less than product width) stops rolling, the steel plate 90-degree rotation, along being extended, directions X is rolled, until steel plate thickness when satisfying the national standard tolerance, is finished rolling.
Above-mentioned thermonuclear fusion heap is characterized in that in Step II I LF treatment process with the manufacture method of stainless steel plate, the tapping when mass percent of the composition of molten steel reaches following the requirement:
0＜C≤0.03%; 0＜Si≤0.75%; 0＜Mn≤2.00%; P≤0.03%; S≤0.01%; Cr 16.00%-18.50%; Ni 10.00%-14.00%; Mo 2.00%-3.00%; 0＜Co≤0.05%; N 0.12%-0.17%; 0＜Nb≤0.10%; 0＜Ta≤0.10%; All the other are Fe and inevitable impurity.
Above-mentioned thermonuclear fusion heap is characterized in that in Step II I LF treatment process with the manufacture method of stainless steel plate, the tapping when mass percent of the composition of molten steel reaches following the requirement:
0＜C≤0.03%; 0＜Si≤0.75%; 0＜Mn≤2.00%; P≤0.03%; S≤0.01%; Cr 16.00%-18.50%; Ni 10.00%-14.00%; Mo 2.00%-3.00%; 0＜Co≤0.05%; N 0.01%-0.10%; 0＜Nb≤0.10%; 0＜Ta≤0.10%; All the other are Fe and inevitable impurity.
Above-mentioned thermonuclear fusion heap is characterized in that in Step II I LF treatment process with the manufacture method of stainless steel plate, the tapping when mass percent of the composition of molten steel reaches following the requirement:
0＜C≤0.08%; 0＜Si≤0.75%; 0＜Mn≤2.00%; P≤0.03%; S≤0.01%; Cr 18.00%-20.00%; Ni 8.00%-10.00%; Mo 0.01%-0.20%; 0＜Co≤0.05%; N 0.01%-0.10%; 0＜Nb≤0.10%; 0＜Ta≤0.10%; All the other are Fe and inevitable impurity.
This thermonuclear fusion heap can effectively increase nitrogen content, reduction inclusion content in melting steel content in the product with the manufacture method of stainless steel plate; Residual element content, inclusion content, mechanical property can reach: 1) 0＜Co in the molten steel≤0.10%, 0＜Nb≤0.1%; 2) A in the product, B, C, 0 grade to 1.5 grades respectively of D type (thick, thin) inclusion, 0 grade to 6.0 grades of the total rank of while inclusion; 3) make the stainless steel hot rolled steel plate less along tensile strength, the elongation characteristics otherness of rolling direction and vertical rolling direction, be generally 0%-15%.
Embodiment
Below by the embodiment of embodiment to the manufacture method of this thermonuclear fusion heap usefulness stainless steel plate, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
The type of stainless steel of present embodiment is 316L (N)-IG.
Grade of steel: 316L (N)-IG, the weight percent of composition requires:
0＜C≤0.08%; 0＜Si≤0.75%; 0＜Mn≤2.00%; P≤0.03%; S≤0.01%; Cr 16.00%-22.50%; Ni 8.00%-14.00%; Mo 0.01%-3.00%; 0＜Co≤0.10%; N 0.01%-0.25%; 0＜Nb≤0.10%; 0＜Ta≤0.10%; All the other are Fe and inevitable impurity.
Product specification: 30 * 1500 * 6000mm.
The step of present embodiment is as follows successively:
I prepares raw material:
The thermonuclear fusion heap that present embodiment is smelted is with 82 tons of stainless molten steels, needs with 2.05 tons of 42.4 tons of molten iron, 22.1 tons in ferrochrome, 11.5 tons of nickel plates, 2.1 tons in ferromanganese, ferrosilicon and 3.4 tons of molybdenum-irons; The composition of the molten steel of smelting meets thermonuclear fusion heap with the requirement of the weight percent of iron, chromium, nickel, manganese, silicon and molybdenum in the stainless steel plate.
The weight percent of each material composition is as follows:
All the other are Fe for hot metal composition: C 3.68% Si 0.08% P 0.013% S 0.008%.
Ferrochrome: C 7.42% Si 1.06% P 0.028% S 0.006% Cr more than 67.2% is Fe.
All the other are impurity for nickel plate: Ni 99.93% Co 0.03%.
Ferromanganese: C 9.07% Si 1.06% P 0.034% S 0.012% Mn72.9% is remaining to be Fe.
Ferrosilicon: C 0.12% P 0.048% S 0.038% Si75.3% is remaining to be Fe.
Molybdenum-iron: C 0.02% P 0.02% S 0.009% Mo62.6% is remaining to be Fe.
II smelting equipment, technique:
Raw material that will be above-mentioned adds in 90 tons of K-OBM-S converters to be smelted, and when the composition of molten steel and temperature reach following the requirement, molten steel is poured in 90 tons of VOD stoves smelt.
C 0.22％ Si 0.10％ Mn 1.82％ Cr 16.23％
Ni 13.81％ P 0.016％ S 0.002％ N 1874ppm
Mo 2.15％ Co 0.03％， Nb 0.01％， Ta 0.010％
All the other are Fe and inevitable impurity, 1586 ℃ of liquid steel temperatures.
The VOD stove is smelted whole process bottom blowing nitrogen, carbon period top blast oxygen 5.2m 3/ t molten steel, 6.2 liter/mins of clock tons of carbon period nitrogen flow molten steel; Decarburization is complete, and 11.5 liter/mins of clock tons of bottom blowing nitrogen flow molten steel stirred 15 minutes; Molten steel nitrogen content 320ppm, adding ferrosilicon 4.8kg/t molten steel, lime 680kg reduce, and molten steel nitrogen increased amount aim parameter 400ppm after the reduction according to calculating formula (1) formula, tries to achieve 11.5 liter/mins of clock tons of bottom blowing nitrogen flow molten steel and blew 25 minutes.The weight percent that molten steel goes out the VOD composition is:
C 0.008％ Si 0.41％ Mn 1.78％ Cr 16.27％
Ni 13.75％ P 0.016％ S 0.002％ N 717ppm
Mo 2.13％ Co 0.03％， Nb 0.01％， Ta 0.010％
All the other are Fe and inevitable impurity, 1577 ℃ of liquid steel temperatures.
III LF treatment process:
Molten steel is adjusted temperature to 1586 ℃ by LF stove heated by electrodes, and the top of the slag adds the aluminium powder of 0.5kg/t (molten steel) before the departures, by the nitrogen flushing amount 1.8 liter/mins of clock ton steel nitrogen blowing after 6 minutes; Add 0.6 kg/tonne of molten steel of Ca-Si line, again by the nitrogen flushing amount 1.1 liter/mins of clock ton nitrogen blowing 7 minutes.The composition weight percent is before the pouring molten steel:
C 0.012％ Si 0.43％ Mn 1.77％ Cr 16.26％
Ni 13.77％ P 0.016％ S 0.002％ N 751ppm
Mo 2.15％ Co 0.03％， Nb 0.01％， Ta 0.010％
All the other are Fe and inevitable impurity.7.2 tons of cast slabs of pouring molten steel.
The IV slab requires:
The steel ingot rolling specs is: 180 (thick) * 1000 (wide) * 1800 (length) mm.Compare with the width of product: (product width-width of plate slab) * 100%/width of plate slab=(1500-1000) * 100%/1000=50%.
The V hot rolling technology:
Two roller cogging-4-roller hot-rolling mills are rolled.
Slab heating temperature 1280-1300 ℃; 203 minutes heat-up times (heat-up time is greater than (slab thickness numerical value mm * 1 minute)).
Slab rolling: after slab goes out process furnace, be rolled along 1000mm direction extension (Y-direction) by blank 180 (thick) * 1000 (wide) * 1800 (length) mm first, when the base width reaches 1550mm, the steel plate 90-degree rotation, along being extended, 1800mm length direction (directions X) is rolled, when steel plate thickness reaches 30.4mm, finish rolling.
The main test item value of product:
1) Co 0.03%, Nb 0.01% in the molten steel;
2) inclusion in the product
A B C D
Thin thickness thickness thickness is thick
0.5 0 1.0 0 0.5 0 1.0 0
3) mechanical property
Directions X: tensile strength 593Mp/mm 2Elongation 56%.
Y-direction: tensile strength 566Mp/mm 2Elongation 49%.
[(directions X tensile strength properties-Y-direction tensile strength properties) ÷ directions X tensile strength properties] * 100%=4.6%＜15%.
[(directions X elongation characteristics-Y-direction elongation characteristics) ÷ directions X elongation characteristics] * 100%=12.5%＜15%.
Embodiment two
The type of stainless steel of present embodiment is 316LN.
Grade of steel: 316LN, the weight percent of composition requires:
0＜C≤0.03%; 0＜Si≤0.75%; 0＜Mn≤2.00%; P≤0.03%; S≤0.01%; Cr 16.00%-18.50%; Ni 10.00%-14.00%; Mo 2.00%-3.00%; 0＜Co≤0.05%; N 0.12%-0.17%; 0＜Nb≤0.10%; 0＜Ta≤0.10%; All the other are Fe and inevitable impurity.
Product specification: 35 * 1800 * 5000mm.
The step of present embodiment is as follows successively:
(1) prepare raw material:
The thermonuclear fusion heap that present embodiment is smelted is with 85 tons of stainless molten steels, needs with 2.2 tons of 44.4 tons of molten iron, 23.2 tons in ferrochrome, 11.8 tons of nickel plates, 1.6 tons in ferromanganese, ferrosilicon and 3.5 tons of molybdenum-irons; The composition of the molten steel of smelting meets thermonuclear fusion heap with the requirement of the weight percent of iron, chromium, nickel, manganese, silicon and molybdenum in the stainless steel plate.
The weight percent of each material composition is as follows:
All the other are Fe for hot metal composition: C 3.44% Si 0.010% P 0.012% S 0.009%.
Ferrochrome: C 7.42% Si 1.06% P 0.028% S 0.006% Cr more than 67.2% is Fe.
All the other are impurity for nickel plate: Ni 99.93% Co 0.03%.
Ferromanganese: C 9.07% Si 1.06% P 0.034% S 0.012% Mn72.9% is remaining to be Fe.
Ferrosilicon: C 0.12% P 0.048% S 0.038% Si75.3% is remaining to be Fe.
Molybdenum-iron: C 0.02% P 0.02% S 0.009% Mo62.6% is remaining to be Fe.
(2) smelting equipment, technique:
Above-mentioned raw material is added in 90 tons of K-OBM-S converters, when the composition of molten steel and temperature reach following the requirement, molten steel poured in 90 tons of VOD stoves smelt;
C 0.18％ Si 0.09％ Mn 1.30％ Cr 16.52％
Ni 13.58％ P 0.018％ S 0.002％ N 2133ppm
Mo 2.14％ Co 0.03％， Nb 0.01％， Ta 0.010％
All the other are Fe and inevitable impurity, 1580 ℃ of liquid steel temperatures.
The VOD stove is smelted whole process bottom blowing nitrogen, carbon period top blast oxygen 4.2m 3/ t molten steel, 5.6 liter/mins of clock tons of carbon period nitrogen flow molten steel; Decarburization is complete, and 12.1 liter/mins of clock tons of bottom blowing nitrogen flow molten steel stirred 18 minutes; Molten steel nitrogen content 522ppm, adding ferrosilicon 5.1kg/t molten steel, lime 620kg reduce, and molten steel nitrogen increased amount aim parameter 1000ppm after the reduction according to calculating formula (1) formula, tries to achieve 12.8 liter/mins of clock tons of bottom blowing nitrogen flow molten steel and blew 52 minutes.Molten steel goes out the VOD composition:
C 0.012％ Si 0.38％ Mn 1.25％ Cr 16.43％
Ni 13.52％ P 0.018％ S 0.002％ N 1531ppm
Mo 2.14％ Co 0.03％， Nb 0.01％， Ta 0.010％
All the other are Fe and 1541 ℃ of inevitable impurity steel water temps.
(3) LF treatment process:
Molten steel is by LF stove heated by electrodes, and 1541 ℃ of liquid steel temperatures are from adjusting temperature to 1588 ℃, and molten steel adds the aluminum steel of 0.61kg/t (molten steel) before the departures, by the nitrogen flushing amount 1.6 liter/mins of clock ton steel nitrogen blowing after 3 minutes; Add 0.5 kg/tonne of molten steel of Ca-Si line, again by the nitrogen flushing amount 1.0 liter/mins of clock ton nitrogen blowing 5 minutes.Composition before the pouring molten steel:
C 0.012％ Si 0.38％ Mn 1.25％ Cr 16.43％
Ni 13.52％ P 0.018％ S 0.002％ N 1558ppm
Mo 2.14％ Co 0.03％， Nb 0.01％， Ta 0.010％
7.2 tons of cast slabs of pouring molten steel.
(4) slab requires:
The steel ingot rolling specs is: 180 (thick) * 1000 (wide) * 2100 (length) mm.Compare with the width of product: (product width-width of plate slab) * 100%/width of plate slab=(1800-1000) * 100%/1000=80%.
(5) hot rolling technology:
Two roller cogging-4-roller hot-rolling mills are rolled.
Slab heating temperature 1280-1300 ℃; 203 minutes heat-up times are greater than (slab thickness numerical value mm * 1 minute).
Slab rolling: after slab goes out process furnace, be rolled along 1000mm direction extension (Y-direction) by blank 180 (thick) * 1000 (wide) * 2100 (length) mm first, when the base width reaches 1800mm, the steel plate 90-degree rotation, along being extended, 2100mm length direction (directions X) is rolled, when steel plate thickness reaches 35.3mm, finish rolling.
The main test item value of product:
1) Co 0.03%, Nb 0.01% in the molten steel;
2) inclusion in the product
A B C D
Thin thickness thickness thickness is thick
0 0 0.5 0 0 0 1.0 0
3) mechanical property
Directions X: tensile strength 613Mp/mm 2Elongation 51%.
Y-direction: tensile strength 592Mp/mm 2Elongation 47%.
[(directions X tensile strength properties-Y-direction tensile strength properties) ÷ directions X tensile strength properties] * 100%=7.8%＜15%.
[(directions X elongation characteristics-Y-direction elongation characteristics) ÷ directions X elongation characteristics] * 100%=3.4%＜15%.
Embodiment three
The type of stainless steel of present embodiment is 316L.
Grade of steel: 316L, the weight percent of composition requires:
0＜C≤0.03%; 0＜Si≤0.75%; 0＜Mn≤2.00%; P≤0.03%; S≤0.01%; Cr 16.00%-18.50%; Ni 10.00%-14.00%; Mo 2.00%-3.00%; 0＜Co≤0.05%; N 0.01%-0.10%; 0＜Nb≤0.10%; 0＜Ta≤0.10%; All the other are Fe and inevitable impurity.
Product specification: 20 * 2000 * 8000mm.
The step of present embodiment is as follows successively:
(1) prepare raw material:
The thermonuclear fusion heap that present embodiment is smelted is with 86 tons of stainless molten steels, needs with 2.45 tons of 45 tons of molten iron, 23.6 tons in ferrochrome, 12.0 tons of nickel plates, 1.6 tons in ferromanganese, ferrosilicon and 3.6 tons of molybdenum-irons; The composition of the molten steel of smelting meets thermonuclear fusion heap with the requirement of the weight percent of iron, chromium, nickel, manganese, silicon and molybdenum in the stainless steel plate.
The weight percent of each material composition is as follows:
All the other are Fe for hot metal composition: C 3.61% Si 0.011% P 0.013% S 0.009%.
Ferrochrome: C 7.42% Si 1.06% P 0.028% S 0.006% Cr more than 67.2% is Fe.
All the other are impurity for nickel plate: Ni 99.93% Co 0.03%.
Ferromanganese: C 9.07% Si 1.06% P 0.034% S 0.012% Mn72.9% is remaining to be Fe.
Ferrosilicon: C 0.12% P 0.048% S 0.038% Si75.3% is remaining to be Fe.
Molybdenum-iron: C 0.02% P 0.02% S 0.009% Mo62.6% is remaining to be Fe.
(2) smelting equipment, technique:
Above-mentioned raw material is added in 90 tons of K-OBM-S converters, when the composition of molten steel and temperature reach following the requirement, molten steel poured in 90 tons of VOD stoves smelt;
C 0.16％ Si 0.09％ Mn 1.33％ Cr 16.48％
Ni 13.49％ P 0.018％ S 0.002％ N 2170ppm
Mo 2.16％ Co 0.03％， Nb 0.01％， Ta 0.010％
All the other are Fe and inevitable impurity, 1582 ℃ of liquid steel temperatures.
The VOD stove is smelted whole process bottom blowing nitrogen, carbon period top blast oxygen 4.1m 3/ t molten steel, 5.8 liter/mins of clock tons of carbon period nitrogen flow molten steel; Decarburization is complete, and 12.3 liter/mins of clock tons of bottom blowing nitrogen flow molten steel stirred 10 minutes; Molten steel nitrogen content 469ppm, adding ferrosilicon 5.0kg/t molten steel, lime 620kg reduce, and molten steel does not carry out nitrogen pick-up after the reduction, and molten steel goes out the VOD composition:
C 0.010％ Si 0.35％ Mn 1.35％ Cr 16.40％
Ni 13.48％ P 0.018％ S 0.002％ N 469ppm
Mo 2.15％ Co 0.03％， Nb 0.01％， Ta 0.010％
All the other are Fe and 1545 ℃ of inevitable impurity steel water temps.
(3) LF treatment process:
Molten steel is by LF stove heated by electrodes, and 1545 ℃ of liquid steel temperatures are from adjusting temperature to 1585 ℃, and molten steel adds the aluminum steel of 0.60kg/t (molten steel) before the departures, by the nitrogen flushing amount 1.7 liter/mins of clock ton steel nitrogen blowing after 3 minutes; Add 0.5 kg/tonne of molten steel of Ca-Si line, again by the nitrogen flushing amount 1.0 liter/mins of clock ton nitrogen blowing 5 minutes.Composition before the pouring molten steel:
C 0.012％ Si 0.38％ Mn 1.25％ Cr 16.43％
Ni 13.52％ P 0.018％ S 0.002％ N 526ppm
Mo 2.14％ Co 0.03％， Nb 0.01％， Ta 0.010％
7.2 tons of cast slabs of pouring molten steel.
(4) slab requires:
The steel ingot rolling specs is: 180 (thick) * 1000 (wide) * 2100 (length) mm.Compare with the width of product: (product width-width of plate slab) * 100%/width of plate slab=(1800-1000) * 100%/1000=80%.
(5) hot rolling technology:
Two roller cogging-4-roller hot-rolling mills are rolled.
Slab heating temperature 1240-1260 ℃; 215 minutes heat-up times are greater than (slab thickness numerical value mm * 1 minute).
Slab rolling: after slab goes out process furnace, be rolled along 1000mm direction extension (Y-direction) by blank 180 (thick) * 1000 (wide) * 2100 (length) mm first, when the base width reaches 2000mm, the steel plate 90-degree rotation, along being extended, 2100mm length direction (directions X) is rolled, when steel plate thickness reaches 20.1mm, finish rolling.
The main test item value of product:
1) Co 0.03%, Nb 0.01% in the molten steel;
2) inclusion in the product
A B C D
Thin thickness thickness thickness is thick
0 0.5 0.5 0 0 0 1.0 0
3) mechanical property
Directions X: tensile strength 563Mp/mm 2Elongation 50%.
Y-direction: tensile strength 558Mp/mm 2Elongation 48%.
[(directions X tensile strength properties-Y-direction tensile strength properties) ÷ directions X tensile strength properties] * 100%=0.9%＜15%.
[(directions X elongation characteristics-Y-direction elongation characteristics) ÷ directions X elongation characteristics] * 100%=4.0%＜15%.
Embodiment four
The type of stainless steel of present embodiment is 304.
Grade of steel: 304, the weight percent of composition requires:
0＜C≤0.08%; 0＜Si≤0.75%; 0＜Mn≤2.00%; P≤0.03%; S≤0.01%; Cr 18.00%-20.00%; Ni 8.00%-10.00%; Mo 0.01%-0.20%; 0＜Co≤0.05%; N 0.01%-0.10%; 0＜Nb≤0.10%; 0＜Ta≤0.10%; All the other are Fe and inevitable impurity.
Product specification: 35 * 1800 * 5000mm.
The step of present embodiment is as follows successively:
(1) prepare raw material:
The thermonuclear fusion heap that present embodiment is smelted needs with 52.5 tons of molten iron, 25.7 tons in ferrochrome, 7.8 tons of nickel plates, 1.6 tons in ferromanganese, 2.3 tons of ferrosilicon (with 0 ton of molybdenum-iron) with 85 tons of stainless molten steels; The composition of the molten steel of smelting meets thermonuclear fusion heap with the requirement of the weight percent of the iron in the stainless steel plate, chromium, nickel, manganese, silicon.
The weight percent of each material composition is as follows:
All the other are Fe for hot metal composition: C 3.52% Si 0.010% P 0.012% S 0.009%.
Ferrochrome: C 7.42% Si 1.06% P 0.028% S 0.006% Cr more than 67.2% is Fe.
All the other are impurity for nickel plate: Ni 99.93% Co 0.03%.
Ferromanganese: C 9.07% Si 1.06% P 0.034% S 0.012% Mn72.9% is remaining to be Fe.
Ferrosilicon: C 0.12% P 0.048% S 0.038% Si75.3% is remaining to be Fe.
Molybdenum-iron: C 0.02% P 0.02% S 0.009% Mo62.6% is remaining to be Fe.
(2) smelting equipment, technique:
Above-mentioned raw material is added in 90 tons of K-OBM-S converters, when the composition of molten steel and temperature reach following the requirement, molten steel poured in 90 tons of VOD stoves smelt;
C 0.14％ Si 0.09％ Mn 1.30％ Cr 18.42％
Ni 9.25％ P 0.018％ S 0.002％ N 2133ppm
Mo 0.03％ Co 0.03％， Nb 0.01％， Ta 0.010％
All the other are Fe and inevitable impurity, 1580 ℃ of liquid steel temperatures.
The VOD stove is smelted whole process bottom blowing nitrogen, carbon period top blast oxygen 4.2m 3/ t molten steel, 5.6 liter/mins of clock tons of carbon period nitrogen flow molten steel; Decarburization is complete, and 12.1 liter/mins of clock tons of bottom blowing nitrogen flow molten steel stirred 18 minutes; Molten steel nitrogen content 478ppm, adding ferrosilicon 5.1kg/t molten steel, lime 620kg reduce, and molten steel nitrogen increased amount aim parameter 300ppm after the reduction according to calculating formula (1) formula, tries to achieve 11.0 liter/mins of clock tons of bottom blowing nitrogen flow molten steel and blew 15.6 minutes.Molten steel goes out the VOD composition:
C 0.04％ Si 0.38％ Mn 1.25％ Cr 18.28％
Ni 9.27％ P 0.018％ S 0.002％ N 780ppm
Mo 0.03％ Co 0.03％， Nb 0.01％， Ta 0.010％
All the other are Fe and inevitable impurity, 1556 ℃ of liquid steel temperatures.
(3) LF treatment process:
Molten steel is by LF stove heated by electrodes, and 1556 ℃ of liquid steel temperatures are from adjusting temperature to 1580 ℃, and molten steel adds the aluminum steel of 0.61kg/t (molten steel) before the departures, by the nitrogen flushing amount 1.6 liter/mins of clock ton steel nitrogen blowing after 3 minutes; Add 0.5 kg/tonne of molten steel of Ca-Si line, again by the nitrogen flushing amount 1.0 liter/mins of clock ton nitrogen blowing 5 minutes.Composition before the pouring molten steel:
C 0.04％ Si 0.38％ Mn 1.25％ Cr 18.28％
Ni 9.27％ P 0.018％ S 0.002％ N 802ppm
Mo 0.03％ Co 0.03％， Nb 0.01％， Ta 0.010％
All the other are Fe and inevitable 7.2 tons of cast slabs of impurity pouring molten steel.
(4) slab requires:
The steel ingot rolling specs is: 180 (thick) * 1000 (wide) * 2100 (length) mm.Compare with the width of product: (product width-width of plate slab) * 100%/width of plate slab=(1800-1000) * 100%/1000=80%.
(5) hot rolling technology:
Two roller cogging-4-roller hot-rolling mills are rolled.
Slab heating temperature 1240-1260 ℃; 217 minutes heat-up times are greater than (slab thickness numerical value mm * 1 minute).
Slab rolling: after slab goes out process furnace, be rolled along 1000mm direction extension (Y-direction) by blank 180 (thick) * 1000 (wide) * 2100 (length) mm first, when the base width reaches 1800mm, the steel plate 90-degree rotation, along being extended, 2100mm length direction (directions X) is rolled, when steel plate thickness reaches 35.3mm, finish rolling.
The main test item value of product:
1) Co 0.03%, Nb 0.01% in the molten steel;
2) inclusion in the product
A B C D
Thin thickness thickness thickness is thick
01 0 0.5 0 0 0 1.0 0
3) mechanical property
Directions X: tensile strength 572Mp/mm 2Elongation 50%.
Y-direction: tensile strength 565Mp/mm 2Elongation 48%.
[(directions X tensile strength properties-Y-direction tensile strength properties) ÷ directions X tensile strength properties] * 100%=1.2%＜15%.
[(directions X elongation characteristics-Y-direction elongation characteristics) ÷ directions X elongation characteristics] * 100%=4.0%＜15%.
Above-mentioned four embodiment smelt method or electric furnace+AOD+VOD smelting method smelting at step (two) smelting equipment, technique also available electric furnace+VOD.

Claims (4)

1. the manufacture method of using stainless steel plate is piled in a thermonuclear fusion, comprises following step successively:
IPrepare raw material: take molten iron, ferrochrome, nickel plate, ferromanganese, ferrosilicon and molybdenum-iron as raw material;
Wherein the nickel plate requires Co content: 0＜Co≤0.5%; The P requirement is in the molten iron: P≤0.03%;
Molten iron, ferrochrome, nickel plate, ferromanganese, ferrosilicon are the compositions that makes the molten steel of smelting with the weight proportion of molybdenum-iron, meet the requirement that the thermonuclear fusion heap is used the weight percent of iron, chromium, nickel, manganese, silicon and molybdenum in the stainless steel plate;
IISmelting equipment, technique:
Adopt VOD stainless steel smelting equipment to smelt by stainless steel-making process, smelt any smelting that method, converter+VOD and electric furnace+AOD+VOD smelts method with electric furnace+VOD;
After smelting in molten iron, ferrochrome, nickel plate, ferromanganese, ferrosilicon and molybdenum-iron adding electric furnace or the converter, pour in the VOD stove and smelt, carbon period top blast oxygen 3-10m 3/ t molten steel, bottom blowing nitrogen flow 〉=5L/mint molten steel; Decarburization is complete, bottom blowing nitrogen flow 〉=10L/mint molten steel, stirring 〉=10min; Adding ferrosilicon 3-10kg/t molten steel, lime 3-25kg/t molten steel reduce, and by (1) formula bottom blowing nitrogen amount, control the molten steel nitrogen increased amount after the reduction;
Y＝2.5×f×X×t （1）
In the formula: X---be blown into the molten steel nitrogen flow, unit liter/min clock ton;
T---the nitrogen blowing time, unit minute;
F---coefficient, span 0.60-1.0;
Y---product needed increases nitrogen content value, ppm;
IIIThe LF treatment process:
Molten steel is entered furnaceman LF position, adjust liquid steel temperature by LF stove heated by electrodes, before going out the LF stove and processing station, add aluminium, the add-on of molten steel per ton is 0.3-1.5kg; By the nitrogen flushing amount in 1 liter-2 liter/mins clock ton molten steel nitrogen blowing 〉=after 2 minutes; Add 0.3-2.0 kg/tonne of molten steel of Ca-Si line, again by 1 liter of-2 liter/mins of clock ton nitrogen blowing of nitrogen flushing amount 〉=2 minutes;
The tapping when mass percent of the composition of molten steel reaches following the requirement:
0＜C ≤0.08% ； 0＜Si≤0.75% ； 0＜Mn≤ 2.00%； P≤0.03%；
S≤0.01%； Cr 16.00%-22.50%； Ni 8.00%-14.00%；
Mo 0.01%-3.00%； 0＜Co≤0.10%； N 0.01%-0.25%； 0＜ Nb≤0.10%；
0＜Ta≤0.10%; All the other are Fe and inevitable impurity;
IVSteel tapping casting steel ingot or continuously cast bloom;
Slab requires:
(the finished product require width-width of plate slab) * 100%/width of plate slab is controlled at 30%-100%;
VHot rolling technology
Slab heating temperature 1230-1310 ℃; The heat-up time 〉=(slab thickness numerical value mm * 1 minute) control;
Slab rolling is to be rolled by steel plate is extended along width first, width of plate slab after rolling and product requirement width phase difference are at 15 millimeters---in the time of 80 millimeters, stop rolling, the steel plate 90-degree rotation, another direction extension along steel plate is rolled, until steel plate thickness when satisfying the national standard tolerance, is finished rolling.
2. thermonuclear fusion heap according to claim 1 is characterized in that in step with the manufacture method of stainless steel plate IIIIn the LF treatment process, the tapping when mass percent of the composition of molten steel reaches following the requirement:
0＜C≤0.03% ；0＜Si≤0.75%； 0＜Mn≤ 2.00%； P≤0.03%；
S≤0.01%； Cr 16.00%-18.50%； Ni 10.00%-14.00%；Mo 2.00%-3.00%； 0＜Co≤0.05%； N 0.12%-0.17%； 0＜Nb≤0.10%；
0＜Ta≤0.10%; All the other are Fe and inevitable impurity.
3. thermonuclear fusion heap according to claim 1 is characterized in that in step with the manufacture method of stainless steel plate IIIIn the LF treatment process, the tapping when mass percent of the composition of molten steel reaches following the requirement:
0＜C≤0.03% ；0＜Si≤0.75%； 0＜Mn≤ 2.00%； P≤0.03%；
S≤0.01%； Cr 16.00%-18.50%； Ni 10.00%-14.00%；Mo 2.00%-3.00%； 0＜Co≤0.05%； N 0.01%-0.10%； 0＜Nb≤0.10%；
0＜Ta≤0.10%; All the other are Fe and inevitable impurity.
4. thermonuclear fusion heap according to claim 1 is characterized in that in step with the manufacture method of stainless steel plate IIIIn the LF treatment process, the tapping when mass percent of the composition of molten steel reaches following the requirement:
0＜C≤0.08% ；0＜Si≤0.75%； 0＜Mn≤ 2.00%； P≤0.03%；
S≤0.01%； Cr 18.00%-20.00%； Ni 8.00%-10.00%；Mo 0.01%-0.20%；
0＜Co≤0.05%； N 0.01%-0.10%； 0＜Nb≤0.10%；
0＜Ta≤0.10%; All the other are Fe and inevitable impurity.
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