CN102650019A - High-strength and high-hardness medium-chromium ferritic stainless steel and manufacturing method thereof - Google Patents
High-strength and high-hardness medium-chromium ferritic stainless steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to high-strength and high-hardness medium-chromium ferritic stainless steel, which comprises the following chemical components in weight percentage: 0.02-0.10 percent of C, 0.30-0.80 percent of Si, 0.40-1.0 percent of Mn, 16.0-20.0 percent of Cr, 0.02-0.08 percent of N, 0-0.3 percent of Ti, 0.08-0.4 percent of V, 0-0.3 percent of Nb and the balance Fe and unavoidable impurities, wherein V percent is not less than 4*N percent. A manufacturing method for the ferritic stainless steel comprises the following steps of: electric furnace and argon oxygen decarburization two-step smelting, casting, hot rolling, cover annealing, acid washing, cold rolling and cold-annealing acid washing, wherein the finish rolling temperature of the hot rolling is controlled to between 800 DEG C and 950 DEG C; the annealing temperature of the hot rolling is controlled to between 800 DEG C and 900 DEG C; the annealing time is 16-24 hours; an in-furnace slow cooling mode is adopted to serve as a cooling mode; the annealing temperature of the cold rolling is controlled to between 900 DEG C and 1000 DEG C, the annealing time is 1-2 minutes, and a spray rapid cooling mode is adopted to serve as the cooling mode. The tensile strength of the obtained steel is 450-600MPa, the yield strength is 250-350MPa, the Vickers hardness is 145-170, and the coefficient of elongation is 30-40 percent.
Description
Technical field
The present invention relates to ferritic stainless steel, particularly relate to the middle chrome ferritic stainless steel and the method for manufacture thereof of HS and high firmness.
Background technology
Middle chrome ferritic stainless steel iron occupies important status in ferritic stainless steel family.Therefore compare with low chrome ferritic stainless steel, it has better solidity to corrosion, compares with high chromium content ferrite stainless steel, and good formability is arranged again, is very suitable for household electrical appliances, kitchen guarding's goods etc. to solidity to corrosion and the formability industry that all has certain requirements.With chrome ferritic stainless steel SUS430 in typical is example; Its purposes in industries such as household electrical appliances is very extensive; From miscellaneous household electrical appliance such as microwave oven inside and outside shell, washing machine inner tub, electric cooker, inner container of electric water heater, electric hot water bottles; To kitchen and toilet facility, tableware, hardware products etc. such as dishwashers, baking box, kitchen range, disinfection cupboard, and other various casees, cabinet, platform, frame etc.China is a household electrical appliances big producing country, but main at present 304 austenitic stainless steels and 430 ferritic stainless steels of using, external is main with ferritic steel then like the U.S. and Japan.In recent years, along with the fluctuation of international nickel valency, the cost advantage of ferritic stainless steel is more outstanding.Therefore, China's ferritic stainless steel especially in chrome ferritic stainless steel huge usage space is arranged on market.
As everyone knows; 430 stainless steels are a kind of middle chrome ferritic stainless steels the most commonly used in the ferritic stainless steel family; But; Conventional 430 application in a lot of industries have received certain restriction again, wherein have one very important reasons be the requirement that conventional 430 mechanical property can not satisfy the user, comprise intensity and hardness.A relatively more outstanding example is in the tableware manufacturing; 430 since good cost performance obtained comparatively widely using, but some high-end tableware manufacturing concern because conventional 430 mechanical property is undesirable; When the outlet Europe or the U.S., received the query of buying the merchant.Finally make manufacturer have to use instead other materials.Except the tableware manufacturing; Other industry such as sanitary equipment, kitchen tools, electric rail brush; Hard-disk cartridge manufacturing etc.; In order to guarantee that these products make product failure in the fracture that receives can not deform under certain load effect, perhaps polish more easily on the surface in manufacturing processed, and these manufacturings are all had higher requirement to 430 mechanical property.
At present, some enterprises of producing stainless steel of home and abroad have been certain about the application prospect of high-strength ferritic stainless steel, release some products of high-strength ferritic stainless steel one after another.But no matter should see, be to improve from composition or technology, and the intensity of chrome ferritic in improving all also has a lot of technological difficulties to capture.With chrome ferritic stainless steel 430 in commonly used is example, and at first, 430 generally use under as-annealed condition, and using-system is ferritic and carbide, and grain fineness number is generally about 8 grades, therefore is difficult to strengthen matrix through phase transformation and grain refining again.Secondly, improve the strength of materials, need strictness to be controlled to partition ratio through the precipitating reinforcing effect that adds microalloy element, rolling and thermal treatment process, the technology output window is narrower, and the production difficulty is bigger.
CN101050509A discloses a kind of Martensite Stainless Steel of high-strength and high-ductility, and its intensity has reached 1700-1800MPa, and it is (mass percent): C≤0.02% that this tempering is learned moity, Si≤0.1%; Mn≤0.1%, S≤0.01%, P≤0.01%; Cr 10.0-11.5%, Ni 11.7-12.5%, Mo 0.5-2.0%; Ti 1.2-1.7%, Al 0.02-0.5%, all the other are Fe.This invention compared with prior art has low cost, HS, high-fracture toughness, high anti-corrosion advantage.But the main body of this invention is a Martensite Stainless Steel; Because martensitic stucture can obtain through austenite cooling under the high temperature; And the generation phase transformation strengthening, the intensity of steel is significantly improved, but corresponding with it be that the plasticity and the toughness of material declines to a great extent; Therefore this invention plasticity and toughness reguirements that can only be applied in material is not too high place, and range of application receives very big restriction.，
CN1334883A discloses a kind of high-strength, high-toughness stainless steel of excellent in resistance to delayed fracture, this invention provides that a kind of building materials use can resistance for delayed fracture with improve the high-strength high corrosion resisting stainless steel of flexible.This invention particular content is; A kind of like this high-strength, high-toughness stainless steel and CARBURIZING FURNACE FOR STAINLESS FASTENER and method of manufacture thereof of excellent in resistance to delayed fracture are provided; Be that it is with mass percent; Contain the C of 0.01-0.25%, the Si of 0.05-1.0%, the Mn of 0.1-2.0%, the Ni of 0.1-3.0%, the Cr of 11.0-16.0%, the N of 0.01-0.15%, the Mo of 0.01-3.0%; Perhaps also contain more than one elements among the W of Nb and 0.05-0.5% of Ti, 0.05-0.5% of B and/or the 0.05-0.5% of 0.001-0.005%, it has less than 10% ferritic and from 1 micron dark skin section of outmost surface at the material central part have martensite and the austenitic mixed structure of 3-30% at least.The intensity that it should be noted that this invention guarantees by the austenite and the martensite on surface, and toughness guarantees that by the ferritic structure of heart portion though this design can improve the intensity and the toughness of material simultaneously, thermal treatment process is complicated, and cost is higher.
JP2004307901A discloses a kind of have good mechanical property ferritic stainless steel and working method thereof.The composition of this steel has comprised appropriate C, N, and Si, Mn, P, S, Cr, Cu, Ni, Mo, Al, and Ti, and satisfy 100P%+Mo%≤3.5%, Si%+Mn%+Ni%+Cu%≤0.5%.The grain fineness number of this invention final finished is at 7 to 10 grades.This invention is satisfied the effect that certain formula is controlled the second phase precipitation strength in the steel grade through control element content; And through controlling the performance that grain fineness number improves steel; But it is to be noted that in reality is produced wanting the content of accurate element to satisfy certain formula is not an easy thing, contains Cu in this invention in addition; Precious metals such as Ni have increased the cost of this invention undoubtedly.
Summary of the invention
The object of the present invention is to provide the middle chrome ferritic stainless steel of a kind of HS and high firmness.
Chrome ferritic stainless steel all has good performance at aspects such as solidity to corrosion and formabilities in the tradition, but in some goods industry, especially need carry out the goods industry of polished finish to the surface, often has intensity and hardness problem of lower.The present invention requires to solve is in not reducing under chrome ferritic stainless steel formability and the corrosion proof prerequisite; The intensity of chrome ferritic stainless steel and hardness in the raising; The raising of hardness can increase the polishability of product surface; Make the goods industry use cost of labor still less just can reach same polishing effect, and the raising of intensity can reduce the thickness of the used metallic substance of goods industry, this has very important significance to enterprise's control production cost.
Be the realization above-mentioned purpose, the middle chrome ferritic stainless steel of HS of the present invention and high firmness, its weight percent chemical ingredients is: C:0.02-0.10%; Si:0.30-0.80%, Mn:0.40-1.0%, Cr:16.0-20.0%; N:0.02-0.08%, Ti:0-0.3%, V:0.08-0.4%; Nb:0-0.3%, V% >=4 * N%, all the other are iron and unavoidable impurities.
Preferably, Nb:0.05-0.3%, Ti:0.05-0.3%.
C and N: carbon, nitrogen all are gap solid solution atoms in the steel, but nitrogen solubleness in steel is more much higher than carbon, and nitride is more stable more tiny than carbide, and the solubleness in ferritic is also lower, and the alligatoring tendency is little, and particle is more stable.Therefore, the nitrogen pick-up meeting forms more nitrogen compound in the steel, stops grain growth, in steel, plays crystal grain thinning, and to the steel of identical content of vanadium, precipitated phase has stronger strengthening effect.In the present invention, carbon and nitrogen are very important alloying elements, play important effect to improving stainless intensity and hardness.C is a kind of strong austenite former; The increase of C can improve steel austenite ratio at high temperature; Thereby in process of cooling subsequently, produce phase transformation, the refinement ferrite crystal grain, N is except being the austenite former equally; Can also become the precipitate of VN with V-arrangement, thereby the steel matrix is played the effect of precipitation strength.Can produce solidity to corrosion to stainless steel again but the carbon nitrogen content is too high, therefore ill effects such as toughness reduction, have certain upper limit and lower limit control to the control of C and N.Be controlled at 0.02-0.12% like C, N is controlled at 0.02-0.08%.
P and S:P and S are harmful elements, and P is deleterious for hot workability, and S can be in the crystal grain edge separation, and the crystal grain edge is become fragile, and the formation of MnS is also to the solidity to corrosion of steel and harmful in addition.Therefore the content of P and S should be on the low side as far as possible on the basis of existing steel-making ability.Be controlled at below 0.05% like P, S is controlled at below 0.01%.
Cr: chromium is the main effect that makes ferritic stainless steel have ferritic structure and have good corrosion resistance; In ferritic stainless steel, with the increase of chromium amount to the main influence of the tissue of steel be quicken α ' phase and σ mutually formation and deposition and make the ferrite crystal grain of steel thicker.Because household electrical appliances generally have higher requirement to formability with steel, so chromium content of the present invention can not be too high to prevent that α ' phase from producing injurious effects with σ formation and deposition mutually to formability.Cr content is controlled at 16-20% among the present invention.
Nb and Ti:Nb and Ti can form TiN with the carbon nitrogen in the steel in the process of continuous casting, (C N) waits precipitate to Nb; These precipitates become the heterogeneous nucleation particle of molten steel in molten steel, promoted the formation of continuously cast bloom equiax crystal, and the raising of continuously cast bloom equiax crystal is to improving the crease resistance of ferritic stainless steel; Plasticity all has important effect, in addition, and TiN; Nb (C, N) these precipitates are separated out in the matrix of steel, and obstruction dislocation glide is arranged equally; Form precipitation strength, improve steel strength, the effect of hardness.Control Nb is below 0.3% among the present invention, and Ti is below 0.3%.Preferably, addition is 0.05-0.3% when adding Nb and/or Ti, and Ti is 0.05-0.3%.
The deposition that the adding of V:V can be about 1000 ℃ forms VN with the N element of steel grade separates out, because separating out of VN is very tiny, and Nano grade often, therefore, the effect of precipitation strength is very obvious.In addition; In steel, form tiny vanadium carbide and vanadium nitride; Through the effect of tiny carbonitride particle pinning crystal boundary, in heat-processed, stop austenite crystal to be grown up, in recrystallize controlled rolling process, stop the austenitic recrystallize of deformation; Delay growing up of recrystallize austenite crystal and separate out, significantly improve the intensity of steel through the deposition of carbonitride.Control V is 0.08-0.4% among the present invention.
Another object of the present invention provides the method for manufacture of the middle chrome ferritic stainless steel of HS and high firmness.
Steel of the present invention existing stainless steel production line capable of using; Electric furnace+AOD two-step approach is smelted; After pickling is moved back in casting → hot rolling → cover annealing → pickling → cold rolling → cold, obtain this invention, it should be noted that the hot rolled finishing temperature is controlled between 800 ℃-950 ℃, the temperature of hot-roll annealing is controlled between 800 ℃-900 ℃; Time, the type of cooling adopted slow cooling in the stove at 16-24 hour; And cold rolled annealed temperature is controlled between 900 ℃-1000 ℃, and the time, the type of cooling adopted water smoke cold soon at 1-2 minute.
Preferably, among the present invention, hot-roll annealing adopts BAF (bell type annealing furnace) annealing.Because this steel grade at high temperature has austenite-ferrite duplex structure; Can produce a large amount of hot rolling martensite after the hot rolling; Bell type annealing furnace can make martensite have adequate time to be decomposed into ferritic and carbide because annealing time is longer, and mechanical property of the present invention is produced wholesome effect.
Preferably, among the present invention, coldly move back pickling and adopt that APC (continuous annealing pickling unit) is cold to move back pickling.Because continuous annealing furnace can produce higher annealing temperature, make the ferritic structure perfect recrystallization after cold rolling, can produce wholesome effect to mechanical property of the present invention.
On formability and solidity to corrosion, still continued the excellent comprehensive performances of middle chrome ferritic stainless steel through the high-strength middle chrome ferritic stainless steel of mentioned component and process program development; In addition, during this is high-strength in chrome ferritic stainless steel and the routine chrome ferritic stainless steel compare, have very excellent mechanical property; Be embodied in tensile strength 450-600MPa; Ys 250-350MPa, Vickers' hardness is at 145-170, unit elongation 30-40%.
Table 1 is seen in the contrast of the composition of chrome ferritic stainless steel and prior art in of the present invention.
The performance comparison of chrome ferritic stainless steel and prior art is seen table 2 in of the present invention.
The performance comparison of table 2 steel of the present invention and prior art steel
| Numbering | Ys (MPa) | Tensile strength (MPa) | Unit elongation (%) |
| The present invention | 250-350 | 450-600 | 25-35 |
| CN101050509A | 700-900 | 1000-1200 | 8-15 |
| CN1334883A | 500-700 | 800-1000 | 10-16 |
| JP2004307901 | - | 400-450 | 20-30 |
| JP02175843A | - | 400-450 | 20-30 |
| JP08291332A | - | 400-450 | 20-30 |
| JP10140292A | - | 400-450 | 20-30 |
| JP10273732A | - | 400-450 | 20-30 |
| SUS430 | 240-280 | 400-450 | 20-30 |
| B430LNT | 200-260 | 380-420 | 30-40 |
Compare with middle chrome ferritic stainless steel commonly used on the market at present; The present invention is owing to added V; Nb, microalloy elements such as Ti, and the adding proportion of V and N limited; Hot rolling finishing temperature during simultaneously to production; Hot-roll annealing temperature and time and cold rolled annealed temperature and time define, and can bring into play the precipitation strength of microalloy element and the phase transformation strengthening effect of mother metal to greatest extent, prepare all chrome ferritic stainless steels in chrome ferritic stainless steel high-strength in common of intensity and hardness.
Description of drawings
Fig. 1 is a heat treating regime of the present invention, and wherein, solid line is the hot plate annealing process among the figure, and dotted line is the cold drawing annealing process.
Embodiment
Below through specific embodiment characteristics of the present invention and effect are described.
The chemical ingredients of the embodiment of the invention is seen table 3, and the main technique condition is seen table 4.
Electric furnace+AOD two-step approach is smelted; Obtain this invention after moving back pickling through casting → hot rolling → BAF cover annealing → pickling → cold rolling → APC is cold; Wherein the hot rolled finishing temperature is controlled between 800 ℃-950 ℃, and hot-roll annealing is shown in realization among Fig. 1, and annealing temperature is controlled between 800 ℃-900 ℃; Time was controlled at 16-24 hour, and the type of cooling adopts slow cooling in the stove; And cold rolled annealed shown in dotted line among Fig. 1, annealing temperature is controlled between 900 ℃-1000 ℃, and the time, the cold mode of moving back adopted water smoke cold soon at 1-2 minute.
Embodiment 1
Carry out electric furnace+AOD two-step approach according to the composition of embodiment in the table 31 and smelt, and obtain this embodiment steel after moving back pickling through casting → hot rolling → BAF cover annealing → pickling → cold rolling → APC is cold according to the processing parameter of the operational path of Fig. 1 and table 2.Wherein the hot rolled finishing temperature is controlled at 800 ℃, and hot-roll annealing is shown in solid line among Fig. 1, and annealing temperature is controlled at 820 ℃, and the time was controlled at 16 hours, and the type of cooling adopts slow cooling in the stove; And cold rolled annealed shown in dotted line among Fig. 1, annealing temperature is controlled at 850 ℃, and the time, the cold mode of moving back adopted water smoke cold soon at 1 minute.Its performance is seen table 4.
Embodiment 2
Carry out electric furnace+AOD two-step approach according to the composition of embodiment in the table 32 and smelt, and obtain this embodiment steel after moving back pickling through casting → hot rolling → BAF cover annealing → pickling → cold rolling → APC is cold according to the processing parameter of the operational path of Fig. 1 and table 2.Wherein the hot rolled finishing temperature is controlled at 850 ℃, and hot-roll annealing is shown in solid line among Fig. 1, and annealing temperature is controlled at 900 ℃, and the time was controlled at 18 hours, and the type of cooling adopts slow cooling in the stove; And cold rolled annealed shown in dotted line among Fig. 1, annealing temperature is controlled at 850 ℃, and the time, the cold mode of moving back adopted water smoke cold soon at 2 minutes.Performance is seen table 4.
Table 3
Embodiment 3
Carry out electric furnace+AOD two-step approach according to the composition of embodiment in the table 33 and smelt, and obtain this embodiment steel after moving back pickling through casting → hot rolling → BAF cover annealing → pickling → cold rolling → APC is cold according to the processing parameter of the operational path of Fig. 1 and table 2.Wherein the hot rolled finishing temperature is controlled at 900 ℃, and hot-roll annealing is shown in solid line among Fig. 1, and annealing temperature is controlled at 800 ℃, and the time was controlled at 20 hours, and the type of cooling adopts slow cooling in the stove; And cold rolled annealed shown in dotted line among Fig. 1, annealing temperature is controlled at 900 ℃, and the time, the cold mode of moving back adopted water smoke cold soon at 1 minute.Its performance is seen table 4.
Embodiment 4
Carry out electric furnace+AOD two-step approach according to the composition of embodiment in the table 34 and smelt, and obtain this embodiment steel after moving back pickling through casting → hot rolling → BAF cover annealing → pickling → cold rolling → APC is cold according to the processing parameter of the operational path of Fig. 1 and table 2.Wherein the hot rolled finishing temperature is controlled at 950 ℃, and hot-roll annealing is shown in solid line among Fig. 1, and annealing temperature is controlled at 800 ℃, and the time was controlled at 22 hours, and the type of cooling adopts slow cooling in the stove; And cold rolled annealed shown in dotted line among Fig. 1, annealing temperature is controlled at 900 ℃, and the time, the cold mode of moving back adopted water smoke cold soon at 1.5 minutes.Its performance is seen table 4.
Embodiment 5
Carry out electric furnace+AOD two-step approach according to the composition of embodiment in the table 35 and smelt, and obtain this embodiment steel after moving back pickling through casting → hot rolling → BAF cover annealing → pickling → cold rolling → APC is cold according to the processing parameter of the operational path of Fig. 1 and table 2.Wherein the hot rolled finishing temperature is controlled at 950 ℃, and hot-roll annealing is shown in solid line among Fig. 1, and annealing temperature is controlled at 850 ℃, and the time was controlled at 24 hours, and the type of cooling adopts slow cooling in the stove; And cold rolled annealed shown in dotted line among Fig. 1, annealing temperature is controlled at 900 ℃, and the time, the cold mode of moving back adopted water smoke cold soon at 1.5 minutes.Its performance is seen table 4.
Embodiment 6
Carry out electric furnace+AOD two-step approach according to the composition of embodiment in the table 16 and smelt, and obtain this embodiment steel after moving back pickling through casting → hot rolling → BAF cover annealing → pickling → cold rolling → APC is cold according to the processing parameter of the operational path of Fig. 1 and table 2.Wherein the hot rolled finishing temperature is controlled at 900 ℃, and hot-roll annealing is shown in solid line among Fig. 1, and annealing temperature is controlled at 870 ℃, and the time was controlled at 16 hours, and the type of cooling adopts slow cooling in the stove; And cold rolled annealed shown in dotted line among Fig. 1, annealing temperature is controlled at 900 ℃, and the time, the cold mode of moving back adopted water smoke cold soon at 2 minutes.Its performance is seen table 4.
Embodiment 7
Carry out electric furnace+AOD two-step approach according to the composition of embodiment in the table 17 and smelt, and obtain this embodiment steel after moving back pickling through casting → hot rolling → BAF cover annealing → pickling → cold rolling → APC is cold according to the processing parameter of the operational path of Fig. 1 and table 2.Wherein the hot rolled finishing temperature is controlled at 850 ℃, and hot-roll annealing is shown in solid line among Fig. 1, and annealing temperature is controlled at 870 ℃, and the time was controlled at 18 hours, and the type of cooling adopts slow cooling in the stove; And cold rolled annealed shown in dotted line among Fig. 1, annealing temperature is controlled at 950 ℃, and the time, the cold mode of moving back adopted water smoke cold soon at 2 minutes.Its performance is seen table 4.
Table 4
Embodiment 8
Carry out electric furnace+AOD two-step approach according to the composition of embodiment in the table 38 and smelt, and obtain this embodiment steel after moving back pickling through casting → hot rolling → BAF cover annealing → pickling → cold rolling → APC is cold according to the processing parameter of the operational path of Fig. 1 and table 2.Wherein the hot rolled finishing temperature is controlled at 800 ℃, and hot-roll annealing is shown in solid line among Fig. 1, and annealing temperature is controlled at 900 ℃, and the time was controlled at 20 hours, and the type of cooling adopts slow cooling in the stove; And cold rolled annealed shown in dotted line among Fig. 1, annealing temperature is controlled at 950 ℃, and the time, the cold mode of moving back adopted water smoke cold soon at 1.5 minutes.Its performance is seen table 4.
Embodiment 9
Carry out electric furnace+AOD two-step approach according to the composition of embodiment in the table 39 and smelt, and obtain this embodiment steel after moving back pickling through casting → hot rolling → BAF cover annealing → pickling → cold rolling → APC is cold according to the processing parameter of the operational path of Fig. 1 and table 2.Wherein the hot rolled finishing temperature is controlled at 800 ℃, and hot-roll annealing is shown in solid line among Fig. 1, and annealing temperature is controlled at 900 ℃, and the time was controlled at 20 hours, and the type of cooling adopts slow cooling in the stove; And cold rolled annealed shown in dotted line among Fig. 1, annealing temperature is controlled at 950 ℃, and the time, the cold mode of moving back adopted water smoke cold soon at 2 minutes.Its performance is seen table 4.
Visible from above result, the high-strength middle chrome ferritic stainless steel of the present invention's process mentioned component and process program development has still continued the excellent comprehensive performances of middle chrome ferritic stainless steel on formability and solidity to corrosion, in addition; During this is high-strength in chrome ferritic stainless steel and the routine chrome ferritic stainless steel compare; Have very excellent mechanical property, be embodied in tensile strength 450-600MPa, ys 250-350MPa; Vickers' hardness is at 145-170, unit elongation 30-40%.
Claims (5)
1. the middle chrome ferritic stainless steel of HS and high firmness, the weight percent of its chemical ingredients is: C:0.02-0.10%, Si:0.30-0.80%; Mn:0.40-1.0%, Cr:16.0-20.0%, N:0.02-0.08%; Ti:0-0.3%, V:0.08-0.4%, Nb:0-0.3%; V% >=4 * N%, all the other are iron and unavoidable impurities.
2. the middle chrome ferritic stainless steel of HS as claimed in claim 1 and high firmness is characterized in that, Nb:0.05-0.3%, Ti:0.05-0.3%.
3. according to claim 1 or claim 2 HS and the middle chrome ferritic stainless steel of high firmness, its tensile strength is 450-600MPa, and ys is 250-350MPa, and Vickers' hardness is 145-170, and unit elongation is 30-40%.
4. like the method for manufacture of the middle chrome ferritic stainless steel of arbitrary described HS of claim 1-3 and high firmness, comprising: electric furnace+AOD two-step approach is smelted, through casting → hot rolling → cover annealing → pickling → cold rolling → continuous annealing pickling, wherein,
The hot rolled finishing temperature is controlled between 800 ℃-950 ℃, and the temperature of hot-roll annealing is controlled between 800 ℃-900 ℃, and annealing time was at 16-24 hour, and the type of cooling adopts slow cooling in the stove;
Cold rolled annealed temperature is controlled between 900 ℃-1000 ℃, and annealing time was at 1-2 minute, and the type of cooling adopts water smoke cold soon.
5. the HS that method as claimed in claim 4 is made and the middle chrome ferritic stainless steel of high firmness, its tensile strength is 450-600MPa, and ys is 250-350MPa, and Vickers' hardness is 145-170, and unit elongation is 30-40%.
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