CN110438416A - Method for eliminating surface cracks of ultra-wide high-nitrogen austenitic stainless steel medium plate - Google Patents

Method for eliminating surface cracks of ultra-wide high-nitrogen austenitic stainless steel medium plate Download PDF

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CN110438416A
CN110438416A CN201910821781.3A CN201910821781A CN110438416A CN 110438416 A CN110438416 A CN 110438416A CN 201910821781 A CN201910821781 A CN 201910821781A CN 110438416 A CN110438416 A CN 110438416A
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temperature
rolling
steel
slab
stainless steel
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CN110438416B (en
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徐海健
沙孝春
闵承鑫
石锋涛
韩楚菲
王文仲
王东旭
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Angang 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
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  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a method for eliminating surface cracks of a medium-thickness plate of ultra-wide high-nitrogen austenitic stainless steel. The proportion of medium axialite in the continuous casting billet is not lower than 85 percent; after the casting blank is polished, the surface roughness Ra is less than or equal to 100 mu m, and high-temperature antioxidant coating is sprayed; the casting blank is treated at the temperature of 980-1100 ℃ in the pre-preheating section, 1100-1230 ℃ in the heating section and 1200-1230 ℃ in the soaking section in sequence and then discharged from the furnace, and the furnace time is 3-4 h; the first stage rolling temperature is more than or equal to 1150 ℃, and the final rolling temperature is more than or equal to 950 ℃; and in the second stage, the initial rolling temperature is more than or equal to 1120 ℃, the final rolling temperature is more than or equal to 950 ℃, the high-temperature solid solution temperature is 980-1050 ℃, the in-furnace time is 2-5 min/mm, and the steel is cooled to room temperature by water. The width of the product is 2200-4000 mm, and the thickness is 20-60 mm. The surface crack rejection rate is reduced from more than 10 percent to less than 2 percent. The product is suitable for high-toughness and high-strength impact-loaded structural parts.

Description

A method of eliminating ultra-wide high-nitrogen austenitic stainless steel surface crack of plate
Technical field
The present invention relates to austenite stainless steel plate rolling technical field, in particular to a kind of elimination ultra-wide high-nitrogen austenitic The method of stainless steel surface crack of plate.
Background technique
With domestic big aircraft experiment wind tunnel laboratory construction in recent years, water vapor pressure force container, Nuclear Safety equipment, The fast development of the industries such as shipping industry, to the austenitic stainless steel cut deal with high low temperature tensile strength and high tenacity Demand increases increasingly, nitrogenous austenitic stainless steel due under high temperature and extremely low temperature all have good plasticity and toughness, it is cold and hot plus Work performance and resistance to local corrosion performance and be widely used in the fields such as petroleum, chemical industry, aerospace and the energy, these fields require material It can reach -196 DEG C using temperature is minimum.Currently, more next to wide cut, large scale nitrogenous austenitic stainless steel hot rolled steel plate demand Bigger, this can reduce splicing weldering mainly due to the use of wide cut, large scale austenitic stainless steel that width is 2200~4000mm Seam reduces manufacturing process wlding flaw detection work amount, reduces cost of equipment maintenance, increases the safety of equipment.Meanwhile it being greatly reduced The prefabricated cost of batch production shortens nitrogenous austenitic stainless steel procurement cycle, promotes engineering-built speed, before wide application Scape.It is uncontrolled warm-natured in hot procedure since nitrogenous austenitic stainless steel continuous casting billet contains 0.1%~0.3% nitrogen Drop, is unavoidably rolled within the scope of brittlement phase Precipitation Temperature, when brittleness Phase Proportion is higher, is easy to cause hot-rolling edge cracking And the generation of face crack, and hot processing temperature is lower, the bigger side of broadening ratio, the cracked phenomenon of surface of steel plate is more serious.By This splits and the generation of face crack as it can be seen that how to solve side, is the key that the exploitation of high-nitrogen austenitic stainless steel cut deal.
Application No. is 201810798758.2 patents to disclose a kind of processing side of SP700 titanium alloy wide cut deal Method.This method is using the fiery hot rolling of rolling direction mutually perpendicular two, and comprehensively control first rolls and the road of the second rolling The technological parameters such as secondary deflection, total deformation and total deformation difference, substantially reduce the anisotropy of SP700 titanium alloy plate, The structural homogenity of SP700 titanium alloy plate is improved, it is 800~2500mm that width, which is finally prepared, with a thickness of 5~30mm SP700 titanium alloy wide cut deal.However, this method production technology is complicated, high production cost, and does not account for high pressure water and remove The influence that squama technique generates plate surface quality.
The patent of application number 201410582327.4 discloses a kind of preparation side of 304LN nuclear power austenitic stainless steel Method is slightly refined by EAF electric arc furnaces, AOD refining, casting, and hot-working forging is finally heat-treated.Preparation method of the invention Processing step is simple, easy to operate, by the strict control to stainless steel chemical component and to smelting, forging, heat treatment process Optimization design, to further increase the corrosion resisting property and mechanical property of 304LN nuclear power austenitic stainless steel, however this method Primary to prepare 304LN austenitic stainless steel by forging method, compared with rolling, cost will be much higher than the cost of rolling, no Suitable for large-scale batch production.
Application No. is 201611037354.9 patents to disclose plate hot-working table in a kind of 2205 two phase stainless steels of elimination The method of facial cleft line, it is characterised in that: slab selection and reconditioning；Slab heating, preheating section temperature are 1100~1150 DEG C, heating Duan Wendu is 1150~1240 DEG C, and soaking section temperature is 1220~1240 DEG C, and the time in furnace presses 9~10min/ of slab thickness 10mm；20~25MPa high-pressure water descaling；Roughing start rolling temperature is greater than 1150 DEG C, and reduction ratio rolls 8~11 passages less than 25%, 35~45mm of workpiece thickness；Finish rolling start rolling temperature is greater than 1050 DEG C, and finishing temperature is greater than 950 DEG C, and reduction ratio is rolled less than 18% Make 8~12 passages.Its advantage is that Rational choice blank specification, Proper Match rolling temperature and reduction ratio after reconditioning optimization heating Etc. parameters, effectively prevent plate surface crack defect in 2205 two phase stainless steels.However, there is no consider optimization steel-making for this method And continuous casting process improves proportion of equiaxed grain in continuous casting billet, and does not account for carrying out stainless steel surface reconditioning spraying to plate table The influence that face quality generates, also not to consideration this influence factor (not defined to board width after steel rolling) of broadening ratio. It follows that it is nitrogenous to develop to provide a kind of method for eliminating ultra-wide high-nitrogen austenitic stainless steel hot rolled steel plate face crack The key problem of austenite stainless steel hot-rolling cut deal.
Summary of the invention
Technical problem to be solved by the present invention lies in the deficiencies in the prior art, provide a kind of elimination ultra-wide nitrogenous Ovshinsky The method of body stainless steel hot-rolling surface crack of plate.This method is using optimization continuous casting stage electromagnetic agitation technique, casting billet surface Reconditioning and spraying antioxidant coating, and using two fiery hot rollings, and the passage of the rolling of comprehensively control first and the second rolling becomes The technological parameters such as shape amount control high-pressure water descaling technique, and it is 2200~4000mm that width, which is finally prepared, with a thickness of 20~ The nitrogenous austenitic stainless steel cut deal of 60mm solves nitrogenous austenitic stainless steel hot rolled steel plate and is also easy to produce side and splits and surface The problem of crackle, face crack rejection rate are reduced to 2% hereinafter, made steel plate average room temperature mechanics by 10% or more of initial stage Performance are as follows: yield strength >=250MPa, tensile strength >=560MPa, elongation percentage >=50%；- 196 DEG C of mechanical properties are as follows: surrender is strong Degree >=350MPa, tensile strength >=1250MPa, elongation percentage >=40%.
The nitrogenous austenitic stainless steel cut deal is mainly suitable for the structural portion for high tenacity, the high-intensitive load that is hit Part, for national large aerospace, the wind-tunnel mechanical system of space equipment, power station steam-water separator, steamer Bigpian and Nuclear Safety The structures such as equipment.
Specific technical solution is:
A method of eliminating ultra-wide nitrogenous austenitic stainless steel hot rolled steel plate face crack, involved steel grade chemistry Composition by weight percent are as follows: C 0.025%~0.1%, Si 0.05%~1%, Mn 1.6%~6%, Cr 10%~ 20.0%, Ni 10%~15%, P≤0.025%, S≤0.003%, N 0.10%~0.35%, Ca 0.0010%~ 0.0020%, Als≤0.05%, surplus are Fe and inevitable impurity.
Specifically comprise the following steps:
(1) it makes steel: being smelted by following compositions, chemical component weight percentage are as follows: C 0.025%~0.1%, Si 0.05%~1%, Mn 1.6%~6%, Cr 10%~20.0%, Ni 10%~15%, P≤0.025%, S≤ 0.003%, N 0.10%~0.3%, Ca 0.0010%~0.0020%, Als≤0.05%, surplus is for Fe and unavoidably Impurity.Using molten iron+steel scrap, or molten iron is used alone, simultaneously by electric furnace steel making, AOD decarburization, the steel-making of VOD deoxidation three-step approach It carries out feeding Si-Ca-Ba silk and the processing of titanium silk after VOD, obtains the molten steel for meeting component requirements；
(2) continuous casting: control 1~1.5m/min of continuous casting process pulling rate, two cold stages apply strong electromagnetic stirring, and agitating mode is Positive and negative rotation alternate agitation inverts 2~5s of mixing time, 1000~2000A of electric current, frequency wherein rotating forward 10~15s of mixing time For 5~20Hz, molten steel is made to obtain continuous casting billet by continuous casting, and proportion of equiaxed grain is not less than 85% in continuous casting billet；
(3) reconditioning and spraying: continuous casting billet carries out the warm online reconditioning in surface of band, is carried out using grinding wheel to slab upper and lower surface complete Then reconditioning, surface roughness Ra≤100 μm use high temperature anti-oxidation coating (Al to the slab spraying after reconditioning2O3), spraying With a thickness of 0.1~0.2mm.
(4) slab heats: the slab of reconditioning and spraying antioxidant coating being sent into walking beam furnace and is heated, is cast It comes out of the stove after successively preheated section of base, bringing-up section and soaking zone processing；Its preheating section temperature range is 980~1100 DEG C, has been avoided Evil phase Cr2Section is precipitated in N, and bringing-up section temperature range is 1100~1230 DEG C, is dissolved harmfulness, and be uniformly distributed in steel, Soaking section temperature section is 1200~1230 DEG C, controls autstenitic grain size, time inside furnace 3~4 hours, avoids heating time mistake It is long, it is cracked near crystal boundary；
(5) high-pressure water descaling: the first rolling sequence, before open rolling using high pressure water to after coming out of the stove slab carry out de-scaling 1~ 2min, 20~25MPa of descaling mill pressure；Second rolling sequence, before open rolling using high pressure water to after coming out of the stove slab carry out de-scaling 1~ 1.5min closes the cooling water that section roller-way is rectified in roughing to heat in the second rolling sequence, and controls roll cooling water flow velocity and be 400~800m3/ h avoids a large amount of cooling waters from flowing in surface of steel plate, and the uncontrolled warm-natured drop of surface of steel plate is made to lead to face crack It generates；
(6) first stage: start rolling temperature >=1150 DEG C is rolled, reduction ratio≤25% is rolled, rolling pony-roughing pass carries out table Face de-scaling, rolling pass 3~5 times, 2~5m/s of mill speed, using infrared radiation thermometer to steel during first rolling The temperature of base is monitored, and when temperature is lower than 950 DEG C, stops rolling.Intermediate slab is back in heating furnace and is in temperature It is mended under conditions of 1200~1230 DEG C temperature 1.5~2 hours；Rolling second stage: start rolling temperature >=1120 DEG C, finishing temperature >= 950 DEG C, rolling reduction ratio≤20%, rolling pass 4~6 times, 2~5m/s of mill speed, when reduction in pass is less than 5mm, It can be controlled by 5mm drafts, extreme trace carries out surface de-scaling after rolling；
(7) it is heat-treated: high temperature solid solution, 980~1050 DEG C of temperature, 2~5min/mm of time inside furnace, water cooling to room temperature.
It is 2200~4000mm that width is obtained prepared by mentioned component, process program, with a thickness of nitrogenous Austria of 20~60mm Family name's body stainless steel cut deal solves the problems, such as that nitrogenous austenitic stainless steel hot rolled steel plate is also easy to produce side and splits and face crack, Face crack rejection rate is reduced to 2% hereinafter, made steel plate average room temperature mechanical property are as follows: surrender by 10% or more of initial stage Intensity >=250MPa, tensile strength >=560MPa, elongation percentage >=50%；- 196 DEG C of mechanical properties are as follows: yield strength >=350MPa, Tensile strength >=1250MPa, elongation percentage >=40%.
The utility model has the advantages that
(1) by optimization continuous casting stage electromagnetic agitation technique (control agitating mode and time), continuous casting billet etc. is greatly improved Axialite rate, while appropriate reconditioning and high-pressure water descaling are carried out to casting billet surface, high quality high nitrogen Ovshinsky is produced from source Body stainless steel hot-rolling cut deal product is laid a good foundation.
(2) the surface spraying of blank and heat preservation method influence rolling very big, and temperature is excessively high to will cause slab severe oxidation, Crystallite dimension roughening, causes the operation of rolling to crack；Temperature is too low, and resistance of deformation is big, and leads to subsequent operation of rolling temperature It is too low, influence product surface quality.So the present invention selection casting billet surface is sprayed, and be strict controlled in furnace temperature with Time ensure that steel plate in final rolling temperature, improves plate surface quality.
(3) present invention is using two fiery hot rollings, and comprehensively control first rolls and the pass deformation etc. of the second rolling Technological parameter controls high-pressure water descaling technique, ensure that rolling carries out at a higher temperature, and finishing temperature control is existed It 950 DEG C or more, avoids harmful phase and section is precipitated, greatly reduce the tendency that steel plate forms crackle, help to obtain high surface matter Dimension plate.
(4) present invention finally be prepared width be 2200~4000mm, with a thickness of 20~40mm nitrogen austenite not Become rusty steel wide cut cut deal, solves ultra-wide nitrogenous austenitic stainless steel hot rolled steel plate and is also easy to produce that side is split and face crack is asked Topic, face crack rejection rate are reduced to 2% hereinafter, made steel plate average room temperature mechanical property are as follows: bend by 10% or more of initial stage Take intensity >=250MPa, tensile strength >=560MPa, elongation percentage >=50%；- 196 DEG C of mechanical properties are as follows: yield strength >= 350MPa, tensile strength >=1250MPa, elongation percentage >=40%.
Specific embodiment
For following embodiment for illustrating the content of present invention, these embodiments are only the general description of the content of present invention, The content of present invention is not limited.
Wherein table 1 is the chemical component of embodiment steel, and table 2 is the smelting process system of embodiment steel, and table 3 is embodiment steel The processing method of slab；Table 4 is the descaling method of embodiment steel；Table 5 is the milling method of embodiment steel；Table 6 is embodiment steel Each reduction in pass；Table 7 is embodiment steel solid solution craft；Table 8 is the stainless Steel Properties of embodiment.
The chemical component (wt, %) of 1 embodiment of the present invention of table
Embodiment C Si Mn Cr Ni N Ca Als
1 0.026 0.35 1.65 18.6 11.2 0.12 0.0011 0.021
2 0.032 0.7 2.0 16.2 12.2 0.20 0.0012 0.019
3 0.059 0.35 4.0 17.3 12.3 0.19 0.0012 0.032
4 0.067 0.8 1.9 15.2 13.2 0.31 0.0017 0.024
5 0.086 0.91 5.2 19.1 14.1 0.27 0.0016 0.039
Note: impurity element P≤0.025% in steel；S≤0.003%；0≤0.0050%
The smelting process system of 2 embodiment steel of table
The processing method of 3 embodiment steel slab of table
The descaling method of 4 embodiment steel of table
The milling method of 5 embodiment steel of table
6 each reduction in pass of embodiment steel of table
7 embodiment steel solid solution craft of table
Embodiment Solid solubility temperature/DEG C Time inside furnace/(minmm-1)
1 1020 3
2 1050 2.5
3 1030 3.5
4 980 2
5 1040 5
The stainless Steel Properties of 8 embodiment of table
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.

Claims (3)

1. a kind of method for eliminating ultra-wide high-nitrogen austenitic stainless steel surface crack of plate, the production technology of steel plate include: Steel smelting-continuous casting-reconditioning and spraying-slab heating-high-pressure water descaling-rolling-heat treatment, which is characterized in that
(1) it makes steel: using molten iron+steel scrap, or molten iron is used alone, pass through electric furnace steel making, AOD decarburization, VOD deoxidation three-step approach It makes steel and carries out feeding Si-Ca-Ba silk and the processing of titanium silk after VOD；
(2) continuous casting: 1~1.5m/min of pulling speed of continuous casting, two cold stages apply strong electromagnetic stirring, and agitating mode is that positive and negative rotation is alternately stirred It mixes, wherein rotating forward 10~15s of mixing time, inverts 2~5s of mixing time, 1000~2000A of electric current, frequency is 5~20Hz, even Proportion of equiaxed grain is not less than 85% in slab；
(3) reconditioning: continuous casting billet carries out the warm online reconditioning in surface of band, carries out full reconditioning, surface roughness Ra to slab upper and lower surface ≤100μm；
(4) slab heats: slab after reconditioning is sent into heating furnace and is heated, successively preheated section of slab, bringing-up section and It comes out of the stove after soaking zone processing；Its preheating section temperature range is 980~1100 DEG C, and bringing-up section temperature range is 1100~1230 DEG C, Soaking section temperature section is 1200~1230 DEG C, controls autstenitic grain size, 3~4h of time inside furnace；
(5) high-pressure water descaling: the first rolling sequence carries out 1~2min of de-scaling to slab after coming out of the stove using high pressure water before open rolling, removes 20~25MPa of squama machine pressure；Second rolling sequence carries out 1~1.5min of de-scaling to slab after coming out of the stove using high pressure water before open rolling, In the second rolling sequence, the cooling water that section roller-way is rectified in roughing to heat is closed, and control roll cooling water flow velocity be 400~ 800m3/h；
(6) roll: the rolling first stage: start rolling temperature >=1150 DEG C roll reduction ratio≤25%, and rolling pony-roughing pass carries out table Face de-scaling, rolling pass 3~5 times, 2~5m/s of mill speed, using infrared radiation thermometer to steel during first rolling The temperature of base is monitored, and when temperature is lower than 950 DEG C, stops rolling；Intermediate slab is back in heating furnace and is in temperature It is mended under conditions of 1200~1230 DEG C temperature 1.5~2 hours；Rolling second stage: start rolling temperature >=1120 DEG C, finishing temperature >= 950 DEG C, rolling reduction ratio≤20%, rolling pass 4~6 times, 2~5m/s of mill speed, when reduction in pass is less than 5mm, It can be controlled by 5mm drafts, extreme trace carries out surface de-scaling after rolling；
(7) it is heat-treated: high temperature solid solution, 980~1050 DEG C of temperature, 2~5min/mm of time inside furnace, water cooling to room temperature.
2. the method according to claim 1 for eliminating ultra-wide high-nitrogen austenitic stainless steel surface crack of plate, special Sign is that slab spraying high temperature antioxidant coating after reconditioning, coating thickness is 0.1~0.2mm.
3. a kind of side for eliminating ultra-wide high-nitrogen austenitic stainless steel surface crack of plate according to claim 1 or 2 Method, which is characterized in that in the austenitic stainless steel of production by weight percentage, contain N 0.10%~0.35%, finished steel Plate gauge lattice are wide 2200~4000mm, 20~60mm of thickness, average room temperature mechanical property are as follows: yield strength >=250MPa, tension are strong Degree >=560MPa, elongation percentage >=50%；- 196 DEG C of mechanical properties are as follows: yield strength >=350MPa, tensile strength >=1250MPa, Elongation percentage >=40%.
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