CN101148739A - Middle-chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel and manufacturing method thereof - Google Patents
Middle-chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel and manufacturing method thereof Download PDFInfo
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Abstract
The RE-containing medium Cr wrinkling resistant ferritic stainless steel has the chemical components including C not more than 0.02 wt%, N not more than 0.02 wt%, Si not more than 0.50 wt%, Mn not more than 0.50 wt%, P not more than 0.03 wt%, S not more than 0.02 wt%, Cr 16-20 wt%, Ni not more than 1.00 wt%, Mo not more than 2.00 wt%, Ti not more than 0.30 wt%, Nb not more than 0.40 wt%, O not more than 0.015 wt%, RE 0.01-0.20 wt%, and Fe and inevitable impurity for the rest. The ferritic stainless steel features low C and N contents, medium Cr content, containing RE, high wrinkling resistance, etc. It is suitable for punching formation to make product.
Description
Technical field
The invention belongs to stainless steel product and manufacturing field thereof, chromium rare earth-containing ferrite wrinkle-resistant stainless steel and manufacture method thereof in relating generally to.
Background technology
Ferritic stainless steel, particularly C, middle Cr that N content is lower are high-purity or super-purity ferrite stainless steel is favored more and more, this is to compare because of the higher ferritic stainless steel of it and traditional C, N content, corrosion resistance nature and shape performance and all have significant improvement, in its over-all properties of many application scenarios not second to nickeliferous austenitic stainless steel.But pressed part industry at thinner thickness, C, the high-purity or super-purity ferrite stainless steel that N content is lower, wrinkling after shaping is more serious, influence the forming property and the visual appearance of product, become a bottleneck that enlarges C, high-purity or super-purity ferrite stainless steel range of application that N content is lower.Wrinkling is a kind of undesirable surface imperfection that ferritic stainless steel produces when dependent variable is big in forming process, and this defective occurs in the rolling direction that is parallel to plate, shows as narrow concave and convex stripe.Therefore, be necessary to study and develop high-purity ferrite stainless steel with good wrinkle resistance.
Chinese patent application CN98801478 has announced anti-deep drawing quality and good ferrite stainless steel and the manufacture method thereof of anti-ridging, principal element content in the stainless steel is limited, deep-draw and anti-wrinkle deformability are by the content of constraint V and Nb, mainly the temperature range that defines billet heating temperature and hot roughing on the manufacture method, do not relate to the interpolation of rare earth in this patent of invention, the effect of rare earth element is not related to.On the other hand, along with domestic and international further investigation, the concrete application of all adding in carbon steel, high quality steel and stainless steel field relevant for rare earth element to the rare earth element effect.
Chinese patent application CN200610012416 has announced middle content chromium copper, iron-containing antiseptic anticreas rustless steel sheet belt and manufacture method thereof, this invention makes common middle chrome ferritic stainless steel have antibiotic crease-resistant function by the batch annealing that adds rare earth, Cu element and hot rolled strip, do not relate to the worse high-purity ferrite stainless steel of crease resistance, and do not relate to the adding method of the continuous annealing process and the rare earth element of hot rolled strip.
Summary of the invention
Chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel and manufacture method thereof in the object of the present invention is to provide, it has good wrinkle resistance in forming process.
For achieving the above object, technical scheme of the present invention is,
Middle chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel, its chemical ingredients mass percent is:
C≤0.02
N≤0.02
Si≤0.50
Mn≤0.50
P≤0.03
S≤0.02
Cr16～20
Ni≤1.00
Mo≤2.00
Ti≤0.30
Nb≤0.40
O≤0.015
Rare earth 0.01～0.20
Surplus Fe and inevitable impurity.
In above-mentioned Chemical Composition, chromium is the alloying element that makes ferritic stainless steel have ferritic structure and have good corrosion resistance.Ferritic stainless steel is in Oxidant, and chromium can make and generate chromic oxide (Cr on the stainless surface rapidly
2O
3) passive film.The rustless property of ferritic stainless steel and corrosion proof acquisition are because under the medium effect, chromium has promoted the passivation of steel and made steel keep stablizing passive result.Chromium is solidity to corrosion to ferritic stainless steel performance impact maximum.Show that mainly chromium improves the scale resistance medium of steel and the performance of acid chloride medium; Chromium also improves the anti-local corrosion of steel, such as the performance of stress corrosion under intergranular corrosion, pitting attack, crevice corrosion and some condition.Chromium rank high-purity ferrite stainless steel in the invention belongs to, chromium remains on 16-20%.
Carbon and nitrogen are unwelcome in ferritic stainless steel, but have no idea to avoid fully.Carbon and nitrogen in the ferrite, except making the steel reinforcement, all shortcomings of ferritic stainless steel, for example, the brittle transition temperature height, notch sensitivity is big, degradation is all relevant with carbon, nitrogen in the steel under the postwelding solidity to corrosion, why carbon and nitrogen have no idea to avoid fully is because contain very high nitrogen in the atmosphere, and steel-making is removed carbon and nitrogen though can remove partly with most of with also containing carbon in starting material chromium, the steel scrap etc. in smelting process, then is very difficult if will remove fully, and carbon, nitrogen are low more in the steel, and the ferritic stainless steel wrinkling is serious more.Take all factors into consideration control (C+N)≤0.04%.
Except carbon, nitrogen, contain the stainless oxygen content in steel of rare-earth ferrite, not only influential to toughness, and the brittle transition temperature of steel is raise.The more important thing is that oxygen level is strict with and is controlled at O≤0.015% for the effectively effect of performance rare earth element.
The vital role of molybdenum mainly is to improve the anti-spot corrosion and the slit and corrosion resistant performance of ferritic stainless steel, promotes the passivation of ferrochrome exothermic, improves Corrosion Resistance of Stainless Steels.But the molybdenum too high levels improves the Sensitivity of Stress Corrosion of the cold rolling attitude of ferritic stainless steel, therefore keeps Mo≤2.0% in the chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel in this, can select in right amount according to service requirements.
Nickel can improve room-temperature mechanical property, intensity and the toughness of ferritic stainless steel, and the brittle transition temperature of steel is moved down, also can further improve the corrosion resistance nature of steel in some medium, centering chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel cold shaping performance and wrinkle resistance improve highly beneficial.But nickel is strong austenite former, for chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel in guaranteeing has single ferritic structure, avoid the crystal grain component segregation to cause the stainless steel wrinkle resistance to descend, keep Ni≤1.00% in the chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel in this.
Titanium and niobium are ferrite former, an amount of titanium and niobium can make the carbon, nitride of chromium in the stainless steel then form titanium, niobium the crystal grain of carbon, nitride and refinement ferritic stainless steel, improve the intergranular corrosion resistance performance of ferritic stainless steel.Take all factors into consideration the influence of titanium, niobium alloy element, keep Ti≤0.30%, Nb≤0.40% in the chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel in this.
Silicon, manganese etc. are indispensable alloying elements in the stainless steel, can be used as deoxidant element,, improve the surface quality of cold rolled sheet in order to improve the purity of molten stainless steel, keep Si≤0.50% among the present invention in the chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel, Mn≤0.50%.
Trace rare-earth element can not only cleaning molten steel, and solidified structure that can the refinement steel, changes character, form and the distribution of inclusion, thereby improves every performance of steel.Rare earth is a surface active element, is enriched in crystal boundary, can improve the cleanliness factor of crystal boundary; Rare earth is again the potent inhibitor of local reduction, and that can improve steel prolongs plasticity, toughness and corrosive nature etc.Chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel middle-weight rare earths element is controlled at the scope of 0.01-0.20% among the present invention, to add the low-carbon and nitrogen high-purity ferrite stainless steel that micro-rare earth element obtains to have good wrinkle resistance, can select content of rare earth in right amount according to service requirements.
The manufacture method of chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel in of the present invention, it comprises the steps:
1) smelting and casting
The total oxygen content of molten steel before the strict control adding rare earth alloy in smelting, require total oxygen content≤150ppm, before the tapping casting, add rare earth alloy, it is casting immediately after rare earth alloy adds, control rare earth alloy adding back and the time of watering between the steel are≤50 seconds, be that rare earth alloy adds adding and the churning time in the molten steel, require to be controlled at≤50 seconds;
Be cast into ingot casting or strand, pouring temperature is controlled at 1530 ± 30 ℃, and the interpolation by rare earth alloy makes proportion of equiaxed grain in the casting blank solidification tissue 〉=40%;
2) ingot casting or strand cogging
Ingot casting or strand adopt hammer cogging or continuous casting and rolling, and when adopting hammer cogging, the Heating temperature of ingot casting or strand is 1000～1100 ℃, and final forging temperature is not less than 900 ℃, slow cooling;
3) hot rolling
According to the steel specification of customer requirements, carry out hot rolling after ingot casting or the strand cogging, the Heating temperature of steel blank is 1000～1100 ℃, and finishing temperature is controlled at 800～950 ℃, air cooling;
4) hot-roll annealing pickling
Strip after the hot rolling adopts the continuous annealing pickling, and annealing temperature remains 950～1050 ℃, and soaking time was not less than 1 minute;
5) cold rolling
The stainless steel hot-rolling strip can adopt a rolling process or two rolling processes after the continuous annealing pickling between the cold rolling finished product of acquisition, accumulative total cold rolling draft 〉=70%.The cold rolling draft of accumulative total is low excessively, will cause the decline of the finished product wrinkle resistance;
6) cold rolling after annealing, pickling
Annealing after cold rolling, cleanup acid treatment, annealing temperature remain 950～1050 ℃, and the treatment time is 1t～20t min., and t is a material thickness, and the thickness of cold rolled sheet when promptly annealing, unit are mm.
Further, smelting employing any smelting technology in vacuum induction furnace, electric arc furnace+external refining or converter+external refining smelts.
Adopt converter-external refining-continuous casting or electric furnace-external refining-continuous casting process; If when adopting continuous casting, the continuous caster that continuous casting must adopt charged magnetic to stir makes proportion of equiaxed grain in the continuously cast bloom solidified structure 〉=40%.
Chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel and preparation method thereof comprises following processing step among the present invention: master operations such as smelting and casting, ingot casting or strand cogging, hot rolling, hot-roll annealing pickling, cold rolling and cold rolling after annealing pickling:
1, smelting and casting
Chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel can be in vacuum induction furnace, electric arc furnace+external refining among the present invention, and any smelting technology is smelted in converter+external refining.
Strict control adds the total oxygen content of molten steel before the rare earth alloy in smelting, requires total oxygen content≤150ppm, and too high total oxygen content will cause the severe oxidation of the rare earth alloy that adds, and the purity and the crease resistance of product had a negative impact; And before the tapping casting, add rare earth alloy, it is casting immediately after rare earth alloy adds, strict control rare earth alloy adding back and the time of watering between the steel are≤50 seconds, be that rare earth alloy adds adding and the churning time in the molten steel, requirement is controlled at≤and 50 seconds, will cause the oxidation of rare earth alloy long pitch time.
Pouring temperature is controlled at 1530 ± 30 ℃, and the interpolation by rare earth alloy makes proportion of equiaxed grain in the casting blank solidification tissue 〉=40%.Pouring temperature is too high, is difficult to realize the control of proportion of equiaxed grain, and pouring temperature is low excessively, causes molten steel to solidify in advance easily and can not cast.
The present invention is applicable to big production converter-external refining-continuous casting, electric furnace-external refining-continuous casting process.If when adopting continuous casting, its continuous casting process can adopt the existing continuous casting process that does not contain the high-purity ferrite stainless steel of rare earth, the continuous caster that continuous casting must adopt charged magnetic to stir makes proportion of equiaxed grain in the continuously cast bloom solidified structure 〉=40%.
2, ingot casting or strand cogging
Ingot casting or strand can adopt hammer cogging or continuous casting and rolling, and when adopting hammer cogging, the Heating temperature of ingot casting or strand is 1000-1100 ℃, and final forging temperature is not less than 900 ℃, slow cooling.Too high Heating temperature will cause the grain coarsening of ingot casting or strand, the wrinkle resistance of deterioration the finished product, and low excessively Heating temperature will cause the increase of resistance to deformation and be unfavorable for finishing smoothly of course of hot rolling.
3, hot rolling
According to the steel specification of customer requirements, carry out hot rolling after ingot casting or the strand cogging, the Heating temperature of steel blank is 1000-1100 ℃, and finishing temperature is controlled at 800-950 ℃, air cooling.Too high Heating temperature will cause the grain coarsening of ingot casting or strand, the wrinkle resistance of deterioration the finished product, and low excessively Heating temperature will cause the increase of resistance to deformation and be unfavorable for finishing smoothly of course of hot rolling.Too high finishing temperature consumes the deformation energy storage of hot rolled strip easily, causes the decline of the finished product wrinkle resistance, and low excessively finishing temperature will cause the increase of resistance to deformation and be unfavorable for finishing smoothly of course of hot rolling.
4, hot-roll annealing pickling
Strip after the hot rolling adopts the continuous annealing pickling, and annealing temperature remains 950～1050 ℃, and soaking time was not less than 1 minute.Chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel can guarantee the wrinkle resistance that it is good by the continuous annealing acid cleaning process of hot rolled strip in this, compares with batch annealing to improve the unit time production capacity greatly and reduce production costs.Annealing temperature is too high, causes the alligatoring of recrystal grain easily, thus the wrinkle resistance of deterioration the finished product, and annealing temperature is low excessively, can not realize the perfect recrystallization of hot rolled strip, also with the wrinkle resistance of deterioration the finished product.Soaking time is too short, can not realize the perfect recrystallization of hot rolled strip equally.
5, cold rolling
The stainless steel hot-rolling strip can adopt a rolling process or two rolling processes after the continuous annealing pickling between the cold rolling finished product of acquisition, (" get different according to raw thickness and finished product thickness; carry out twice or thrice possibly sometimes when cold rolling; and twice cold rolling between, all want process annealing and pickling, such process is called a rolling process ", referring to works such as " stainless steel " Lu Shiying, the Atomic Energy Press, September nineteen ninety-five, first version P454) added up cold rolling draft 〉=70%.The cold rolling draft of accumulative total is low excessively, will cause the decline of the finished product wrinkle resistance.
6, cold rolling after annealing pickling
During annealing and pickling after cold rolling was handled, annealing temperature remained 950～1050 ℃, and the treatment time is 1t-20t min., and t is the thickness of material thickness (unit is mm) cold rolled sheet during for annealing.Annealing temperature is too high, causes the alligatoring of recrystal grain easily, thus the wrinkle resistance of deterioration the finished product, and annealing temperature is low excessively, can not realize the perfect recrystallization of hot rolled strip, also with the wrinkle resistance of deterioration the finished product.Soaking time is long, causes the alligatoring of recrystal grain easily, thus the wrinkle resistance of deterioration the finished product, and soaking time is too short, can not realize the perfect recrystallization of hot rolled strip equally.
Beneficial effect of the present invention
Chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel in of the present invention is characterized in low-carbon and nitrogen, middle chromium rank, contains the ferritic stainless steel of rare earth, and crease resistance is better; Particularly, it can enlarge as cast condition proportion of equiaxed grain and thinning solidification structure, the component segregation that column crystal causes when reducing ingot casting or casting blank solidification, reduce the material viscous deformation ununiformity that causes by component segregation in the following process process, thereby can obviously improve high-purity ferrite stainless steel cold rolling and be shaped after show wrinkling defective, be suitable for punching press, molded article industry.
Description of drawings
Fig. 1 a, Fig. 1 b are respectively the low power macrostructure of the embodiment of the invention 3 and the common middle chrome ferritic stainless steel ingot casting of Comparative Examples.
Fig. 2 be the embodiment of the invention 3 (on) with Comparative Examples common in surface wrinkling shape figure during chrome ferritic stainless steel (descending) test block 15% tensile deformation.
Embodiment
Embodiment is referring to table 1.
Middle chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel of the present invention as can be seen has proportion of equiaxed grain and the better anti-wrinkling property higher than the common middle chrome ferritic stainless steel of Comparative Examples from Fig. 1, Fig. 2.
Table 1 unit: mass percent
| Embodiment | C | N | Si | Mn | P | S | Cr | Ni | Mo | Ti | Nb | O | Ce | Fe |
| 1 | 0.02 | 0.020 | 0.50 | 0.50 | 0.03 | 0.02 | 20.00 | 1.00 | 2.00 | 0.30 | 0.40 | 0.015 | 0.20 | Surplus |
| 2 | 0.018 | 0.014 | 0.28 | 0.35 | 0.03 | 0.02 | 18.97 | 1.00 | 1.98 | 0.30 | 0.35 | 0.012 | 0.183 | Surplus |
| 3 | 0.015 | 0.015 | 0.24 | 0.30 | 0.03 | 0.02 | 18.30 | 1.00 | 1.75 | 0.30 | 0.31 | 0.015 | 0.018 | Surplus |
| 4 | 0.014 | 0.012 | 0.31 | 0.38 | 0.03 | 0.02 | 19.20 | 1.00 | 1.83 | 0.30 | 0.40 | 0.014 | 0.015 | Surplus |
| 5 | 0.010 | 0.011 | 0.21 | 0.31 | 0.03 | 0.02 | 16.00 | 1.00 | 1.91 | 0.30 | 0.40 | 0.015 | 0.01 | Surplus |
Through obtaining the ingot casting of proportion of equiaxed grain 〉=40% after smelting and the casting, cold rolling the reaching repeatedly of process hot rolling, a rolling process or two rolling processes obtains the good rare earth-containing high-purity ferrite stainless-steel cold-rolling strip of crease resistance after annealing, the pickling.
Embodiment 1
1, smelting and casting
The control rare earth alloy adds the back and time of watering between the steel is 50 seconds, and pouring temperature is controlled at 1560 ℃, and the interpolation by rare earth alloy makes that proportion of equiaxed grain reaches 40% in the casting blank solidification tissue.
2, ingot casting or strand cogging
Ingot casting or strand can adopt hammer cogging or continuous casting and rolling, and when adopting hammer cogging, the Heating temperature of ingot casting or strand is 1100 ℃, 950 ℃ of final forging temperatures, slow cooling.
3, hot rolling
Ingot casting or strand cogging post-heating to 1100 ℃ roll into the hot rolled strip that thickness is 4.0mm, and finishing temperature is 870 ℃, air cooling.
4, hot-roll annealing pickling
Strip after the hot rolling adopts the continuous annealing pickling, and annealing temperature remains 1000 ℃, soaking time 2 minutes.
5, cold rolling
Hot rolled strip after the continuous annealing pickling is carried out the cold rolling of a rolling process, and cold rolling draft is 84%, the cold rolled sheet of cold rolling one-tenth 0.64mm.
6, cold rolling after annealing pickling
During annealing and pickling after cold rolling was handled, annealing temperature remained 980 ℃, and the treatment time is 1min.
Embodiment 2
1, smelting and casting
The control rare earth alloy adds the back and time of watering between the steel is 40 seconds, and pouring temperature is controlled at 1550 ℃, and the interpolation by rare earth alloy makes that proportion of equiaxed grain reaches 42% in the casting blank solidification tissue.
2, ingot casting or strand cogging
Ingot casting or strand can adopt hammer cogging or continuous casting and rolling, and when adopting hammer cogging, the Heating temperature of ingot casting or strand is 1080 ℃, 950 ℃ of final forging temperatures, slow cooling.
3, hot rolling
Ingot casting or strand cogging post-heating to 1080 ℃ roll into the hot rolled strip that thickness is 4.0mm, and finishing temperature is 850 ℃, air cooling.
4, hot-roll annealing pickling
Strip after the hot rolling adopts the continuous annealing pickling, and annealing temperature remains 1050 ℃, soaking time 1 minute.
5, cold rolling
Hot rolled strip after the continuous annealing pickling is carried out the cold rolling of a rolling process, and cold rolling draft is 86%, the cold rolled sheet of cold rolling one-tenth 0.56mm.
6, cold rolling after annealing pickling
During annealing and pickling after cold rolling was handled, annealing temperature remained 970 ℃, and the treatment time is 1min..
Embodiment 3
1, smelting and casting
The control rare earth alloy adds the back and time of watering between the steel is 30 seconds, and pouring temperature is controlled at 1540 ℃, and the interpolation by rare earth alloy makes that proportion of equiaxed grain reaches 43% in the casting blank solidification tissue.
2, ingot casting or strand cogging
Ingot casting or strand can adopt hammer cogging or continuous casting and rolling, and when adopting hammer cogging, the Heating temperature of ingot casting or strand is 1060 ℃, 950 ℃ of final forging temperatures, slow cooling.
3, hot rolling
Ingot casting or strand cogging post-heating to 1060 ℃ roll into the hot rolled strip that thickness is 4.0mm, and finishing temperature is 850 ℃, air cooling.
4, hot-roll annealing pickling
Strip after the hot rolling adopts the continuous annealing pickling, and annealing temperature remains 970 ℃, soaking time 5 minutes.
5, cold rolling
Hot rolled strip after the continuous annealing pickling is carried out the cold rolling of two rolling processes, and cold rolling accumulative total draft is 85%, the cold rolled sheet of cold rolling one-tenth 0.6mm.
6, cold rolling after annealing pickling
During annealing and pickling after cold rolling was handled, annealing temperature remained 970 ℃, and the treatment time is 2.5min.
Embodiment 4
1, smelting and casting
The control rare earth alloy adds the back and time of watering between the steel is 20 seconds, and pouring temperature is controlled at 1520 ℃, and the interpolation by rare earth alloy makes that proportion of equiaxed grain reaches 44% in the casting blank solidification tissue.
2, ingot casting or strand cogging
Ingot casting or strand can adopt hammer cogging or continuous casting and rolling, and when adopting hammer cogging, the Heating temperature of ingot casting or strand is 1050 ℃, 900 ℃ of final forging temperatures, slow cooling.
3, hot rolling
Ingot casting or strand cogging post-heating to 1050 ℃ roll into the hot rolled strip that thickness is 3.0mm, and finishing temperature is 850 ℃, air cooling.
4, hot-roll annealing pickling
Strip after the hot rolling adopts the continuous annealing pickling, and annealing temperature remains 950 ℃, soaking time 5 minutes.
5, cold rolling
Hot rolled strip after the continuous annealing pickling is carried out the cold rolling of a rolling process, and cold rolling draft is 83%, the cold rolled sheet of cold rolling one-tenth 0.51mm.
6, cold rolling after annealing pickling
During annealing and pickling after cold rolling was handled, annealing temperature remained 950 ℃, and the treatment time is 1min.
Embodiment 5
1, smelting and casting
The control rare earth alloy adds the back and time of watering between the steel is 20 seconds, and pouring temperature is controlled at 1500 ℃, and the interpolation by rare earth alloy makes that proportion of equiaxed grain reaches 45% in the casting blank solidification tissue.
2, ingot casting or strand cogging
Ingot casting or strand can adopt hammer cogging or continuous casting and rolling, and when adopting hammer cogging, the Heating temperature of ingot casting or strand is 1000 ℃, 950 ℃ of final forging temperatures, slow cooling.
3, hot rolling
Ingot casting or strand cogging post-heating to 1050 ℃ roll into the hot rolled strip that thickness is 3.0mm, and finishing temperature is 830 ℃, air cooling.
4, hot-roll annealing pickling
Strip after the hot rolling adopts the continuous annealing pickling, and annealing temperature remains 950 ℃, soaking time 5 minutes.
5, cold rolling
Hot rolled strip after the continuous annealing pickling is carried out the cold rolling of two rolling processes, cold rolling draft partition ratio 60%: 40%, the accumulative total draft is 82%, the cold rolled sheet of cold rolling one-tenth 0.54mm.
6, cold rolling after annealing pickling
During annealing and pickling after cold rolling was handled, annealing temperature remained 970 ℃, and the treatment time is 1min..
Claims (4)
1. middle chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel, its chemical ingredients mass percent is:
C≤0.02
N≤0.02
Si≤0.50
Mn≤0.50
P≤0.03
S≤0.02
Cr16～20
Ni≤1.00
Mo≤2.00
Ti≤0.30
Nb≤0.40
O≤0.015
Rare earth 0.01～0.20
Surplus Fe and inevitable impurity.
2. the manufacture method of chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel in as claimed in claim 1, it comprises the steps:
1) smelting and casting
The total oxygen content of molten steel before the strict control adding rare earth alloy in smelting, require total oxygen content≤150ppm, before the tapping casting, add rare earth alloy, it is casting immediately after rare earth alloy adds, control rare earth alloy adding back and the time of watering between the steel are≤50 seconds, be that rare earth alloy adds adding and the churning time in the molten steel, require to be controlled at≤50 seconds;
Be cast into ingot casting or strand, pouring temperature is controlled at 1 530 ± 30 ℃, and the interpolation by rare earth alloy makes proportion of equiaxed grain in the casting blank solidification tissue 〉=40%;
2) ingot casting or strand cogging
Ingot casting or strand adopt hammer cogging or continuous casting and rolling, and when adopting hammer cogging, the Heating temperature of ingot casting or strand is 1000～1100 ℃, and final forging temperature is not less than 900 ℃, slow cooling;
3) hot rolling
Carry out hot rolling after ingot casting or the strand cogging, the Heating temperature of steel blank is 1000～1100 ℃, and finishing temperature is controlled at 800～950 ℃, air cooling;
4) hot-roll annealing pickling
Strip after the hot rolling adopts the continuous annealing pickling, and annealing temperature remains 950～1050 ℃, and soaking time was not less than 1 minute;
5) cold rolling
The stainless steel hot-rolling strip is adopting a rolling process or two rolling processes after the continuous annealing pickling between the cold rolling finished product of acquisition, accumulative total cold rolling draft 〉=70%;
6) cold rolling after annealing, pickling
Annealing after cold rolling, cleanup acid treatment, annealing temperature remain 950～1050 ℃, and the treatment time is 1t～20tmin., and t is a material thickness, and the thickness of cold rolled sheet when promptly annealing, unit are mm.
3. the manufacture method of chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel is characterized in that in as claimed in claim 1, smelts employing any smelting technology in vacuum induction furnace, electric arc furnace+external refining or converter+external refining and smelts.
4. the manufacture method of chromium rare earth-containing high-purity ferrite wrinkle-resistant stainless steel is characterized in that in as claimed in claim 1, and step 1) adopts converter-external refining-continuous casting or electric furnace-external refining-continuous casting process; If when adopting continuous casting, the continuous caster that continuous casting must adopt charged magnetic to stir makes proportion of equiaxed grain in the continuously cast bloom solidified structure 〉=40%.
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| CN102051460A (en) * | 2010-10-29 | 2011-05-11 | 山东理工大学 | Corrosion-resistance optimizing treatment process for Cr-Ni type stainless steel and corrosion-resistant plate |
| CN101768702B (en) * | 2008-12-31 | 2012-05-30 | 宝山钢铁股份有限公司 | Medium-chromium ferrite stainless steel for automobile with high formability and acidic corrosion resistance as well as manufacturing method thereof |
| CN102605262A (en) * | 2011-01-25 | 2012-07-25 | 宝山钢铁股份有限公司 | Ferritic stainless steel and method for manufacturing same |
| CN101812641B (en) * | 2009-02-25 | 2013-09-04 | 宝山钢铁股份有限公司 | Ferrite stainless steel |
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| CN103540859A (en) * | 2013-10-31 | 2014-01-29 | 万宝力不锈钢制品（东莞）有限公司 | High heat-resistant stainless steel coffee pot material and preparation method thereof |
| CN104053808A (en) * | 2012-01-26 | 2014-09-17 | 新日铁住金株式会社 | Case hardening steel material with little heat-treatment strain |
| CN106319382A (en) * | 2015-06-26 | 2017-01-11 | 宝钢不锈钢有限公司 | Low-nickel type medium-chromium ferrite stainless steel and manufacturing method thereof |
| CN107012302A (en) * | 2017-05-12 | 2017-08-04 | 宁波诺宏金属材料技术咨询有限公司 | A kind of anti-creping of stainless steel |
| CN107746938A (en) * | 2017-12-05 | 2018-03-02 | 东北大学 | One kind is containing ultrapure high chromium content ferrite wrinkle-resistant stainless steel of rare earth and preparation method thereof |
| CN108220812A (en) * | 2018-02-05 | 2018-06-29 | 东北大学 | A kind of super ferrite stainless steel of plasticity containing rare earth high-strength and preparation method thereof |
| CN108950417A (en) * | 2018-09-05 | 2018-12-07 | 合肥久新不锈钢厨具有限公司 | A kind of processing technology of tap special stainless steel material |
| CN109648064A (en) * | 2019-01-25 | 2019-04-19 | 北京科技大学 | A kind of method of super austenitic stainless steel solidified structure σ interconvertibility |
| CN113500098A (en) * | 2021-08-20 | 2021-10-15 | 山西太钢不锈钢股份有限公司 | Method for eliminating rolling chromatic aberration of ultrapure ferrite stainless steel by five-rack six-roller continuous rolling mill |
| CN113881891A (en) * | 2021-08-27 | 2022-01-04 | 北京科技大学 | Ferrite stainless steel containing rare earth sulfide nucleating agent and preparation method thereof |
| CN116024489A (en) * | 2021-10-27 | 2023-04-28 | 江苏新华合金有限公司 | 316H plate and production process thereof |
-
2006
- 2006-09-22 CN CNB2006101164201A patent/CN100519810C/en not_active Expired - Fee Related
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| CN101768702B (en) * | 2008-12-31 | 2012-05-30 | 宝山钢铁股份有限公司 | Medium-chromium ferrite stainless steel for automobile with high formability and acidic corrosion resistance as well as manufacturing method thereof |
| CN101812641B (en) * | 2009-02-25 | 2013-09-04 | 宝山钢铁股份有限公司 | Ferrite stainless steel |
| CN102051460B (en) * | 2010-10-29 | 2012-09-05 | 山东理工大学 | Corrosion-resistance optimizing treatment process for Cr-Ni type stainless steel and corrosion-resistant plate |
| CN102051460A (en) * | 2010-10-29 | 2011-05-11 | 山东理工大学 | Corrosion-resistance optimizing treatment process for Cr-Ni type stainless steel and corrosion-resistant plate |
| CN102605262A (en) * | 2011-01-25 | 2012-07-25 | 宝山钢铁股份有限公司 | Ferritic stainless steel and method for manufacturing same |
| CN104053808A (en) * | 2012-01-26 | 2014-09-17 | 新日铁住金株式会社 | Case hardening steel material with little heat-treatment strain |
| US9422613B2 (en) | 2012-01-26 | 2016-08-23 | Nippon Steel & Sumitomo Metal Corporation | Case hardened steel having reduced thermal treatment distortion |
| CN104053808B (en) * | 2012-01-26 | 2016-01-20 | 新日铁住金株式会社 | The surface hardening steel that thermal treatment should diminish |
| CN103526131A (en) * | 2013-10-31 | 2014-01-22 | 万宝力不锈钢制品（东莞）有限公司 | High-strength stainless steel coffee pot material and preparation method thereof |
| CN103540859B (en) * | 2013-10-31 | 2015-05-27 | 万宝力不锈钢制品（东莞）有限公司 | High heat-resistant stainless steel coffee pot material and preparation method thereof |
| CN103526131B (en) * | 2013-10-31 | 2015-07-22 | 万宝力不锈钢制品（东莞）有限公司 | High-strength stainless steel coffee pot material and preparation method thereof |
| CN103526123B (en) * | 2013-10-31 | 2015-10-28 | 万宝力不锈钢制品（东莞）有限公司 | A kind of high tenacity stainless steel coffee pot material and preparation method thereof |
| CN103540859A (en) * | 2013-10-31 | 2014-01-29 | 万宝力不锈钢制品（东莞）有限公司 | High heat-resistant stainless steel coffee pot material and preparation method thereof |
| CN103526123A (en) * | 2013-10-31 | 2014-01-22 | 万宝力不锈钢制品（东莞）有限公司 | High-tenacity stainless steel coffee pot material and preparation method thereof |
| CN106319382B (en) * | 2015-06-26 | 2019-09-10 | 宝钢德盛不锈钢有限公司 | Chrome ferritic stainless steel and its manufacturing method in a kind of low-nickel type |
| CN106319382A (en) * | 2015-06-26 | 2017-01-11 | 宝钢不锈钢有限公司 | Low-nickel type medium-chromium ferrite stainless steel and manufacturing method thereof |
| CN107012302A (en) * | 2017-05-12 | 2017-08-04 | 宁波诺宏金属材料技术咨询有限公司 | A kind of anti-creping of stainless steel |
| CN107012302B (en) * | 2017-05-12 | 2019-01-04 | 宁波诺宏金属材料技术咨询有限公司 | A kind of anti-creping of stainless steel |
| CN107746938A (en) * | 2017-12-05 | 2018-03-02 | 东北大学 | One kind is containing ultrapure high chromium content ferrite wrinkle-resistant stainless steel of rare earth and preparation method thereof |
| CN108220812A (en) * | 2018-02-05 | 2018-06-29 | 东北大学 | A kind of super ferrite stainless steel of plasticity containing rare earth high-strength and preparation method thereof |
| CN108950417A (en) * | 2018-09-05 | 2018-12-07 | 合肥久新不锈钢厨具有限公司 | A kind of processing technology of tap special stainless steel material |
| CN109648064A (en) * | 2019-01-25 | 2019-04-19 | 北京科技大学 | A kind of method of super austenitic stainless steel solidified structure σ interconvertibility |
| CN113500098A (en) * | 2021-08-20 | 2021-10-15 | 山西太钢不锈钢股份有限公司 | Method for eliminating rolling chromatic aberration of ultrapure ferrite stainless steel by five-rack six-roller continuous rolling mill |
| CN113881891A (en) * | 2021-08-27 | 2022-01-04 | 北京科技大学 | Ferrite stainless steel containing rare earth sulfide nucleating agent and preparation method thereof |
| CN116024489A (en) * | 2021-10-27 | 2023-04-28 | 江苏新华合金有限公司 | 316H plate and production process thereof |
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