CN102719767B - Economic duplex stainless steel with excellent cold forging performance and manufacturing method thereof - Google Patents
Economic duplex stainless steel with excellent cold forging performance and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses economic duplex stainless steel with excellent cold forging performance and a manufacturing method thereof. The economic duplex stainless steel comprises the following chemical composition in percentage by weight: 0.01 to 0.07 percent of C, 0.1 to 1.0 percent of Si, 4.0 to 7.0 percent of Mn, 21.5 to 23.5 percent of Cr, 1.8 to 3.5 percent of Ni, 0.08 to 0.15 percent of N, 0 to 0.5 percent of Mo, 0.1 to 1.5 percent of Cu and the balance of Fe and inevitable impurities. The Ni is replaced by a proper amount of Mn and N, in order to guarantee the corrosion resistance of the alloy, the Cr content is controlled to 21.5 to 23.5 percent, and 0 to 0.5 percent of Mo is added; in order to reduce the yield strength and work-hardening rate of materials and improve the cold forging performance of the materials, the N content is controlled between 0.08 and 0.15 percent, and 0.1 to 1.5 percent of Cu is added. The economic duplex stainless steel has excellent corrosion resistance and excellent cold forging performance and can be applied to stainless steel fasteners, silk screen and other industries in a large scale under the condition that the content of the Ni, Mo and other precious metals is low, and 304-austenitic stainless steel with high cost is partially substituted.
Description
Technical field
The present invention relates to field of metallurgy, especially a kind of economical diphase stainless steel and manufacture method thereof with excellent cold heading performance.
Background technology
Be made up of ferrite and austenitic duplex under duplex stainless steel room temperature, wherein the ratio of arbitrary phase is not less than 40%, and therefore duplex stainless steel has the advantage of ferritic stainless steel and austenitic stainless steel concurrently.Compared with austenitic stainless steel, the intensity of duplex stainless steel, particularly yield strength significantly improves, and is approximately the twice of austenitic stainless steel; Intergranular corrosion resistance, anticorrosion stress-resistant, resistance to corrosion fatigue and wear resisting property significantly improve.With ferritic stainless steel ratio, its toughness is high, brittle transition temperature is low, intergranular corrosion resistance and weldability are significantly improved, and remains the advantage that ferritic steel thermal conductivity is high, the coefficient of expansion is little simultaneously.
The development experience of duplex stainless steel three important stages:
The trade mark developed before 1971 is first-generation duplex stainless steel, and due to the restriction of smelting condition, the content of C, N all cannot accurately control, and after its welding, performance sharply declines.
The trade mark of exploitation in 1971 ~ 1989 years belongs to s-generation duplex stainless steel, and representing steel grade is S32205.By means of invention and the application of nineteen sixty-eight stainless steel precision sweetening process-argon oxygen decarburization (AOD), nitrogen content in duplex stainless steel can be made to significantly improve, carbon content is accurately controlled, thus significantly improving weld seam, the toughness of heat affected zone and corrosion resistance nature, nitrogen also reduces the synthesis speed of phase between poisonous metal simultaneously.
The trade mark occurred after nineteen ninety is third generation duplex stainless steel, its development presents two kinds of trend: improve steel interalloy constituent content on the one hand further to obtain more high strength and more excellent corrosion resistance nature, as SAF2906 and SAF3207 that Sweden SANDVIK develops; On the other hand exploitation low nickel content and containing Mo or only containing the economical diphase stainless steel of a small amount of Mo, to reduce costs, as LDX 2101, S32202 etc.
Along with highlighting gradually the importance of manufacturers and user of Precious Metals Resources, the exploitation of economical diphase stainless steel becomes the important R&D direction of current duplex stainless steel.Economical diphase stainless steel, by special alloy designs, reduces the content of precious metal nickel and molybdenum in alloy, thus significantly reduces material cost.
Conventional austenite equivalent calculation formula is as the formula (1):
Ni
eq=Ni+30(C＋N)+0.5Mn+0.25Cu (1)
Evaluate the PREN(equivalent of resistance to spot corrosion of the resistance to pitting attack performance of duplex stainless steel) as shown in Equation (2):
PREN=Cr%+3.3Mo%+30N%-Mn% (2)
From formula (1), Mn, N, Cu can be adopted to replace Ni, thus reduce costs, replace traditional high molybdenum, the duplex stainless steel of high nickel content, this is the basis of economical diphase stainless steel exploitation.
From formula (1), nitrogen forms 30 times that austenitic ability is Ni.In addition, from formula (2), N can significantly improve the PREN value of material, thus is conducive to the solidity to corrosion improving duplex stainless steel steel.Therefore, nitrogen is one of most important element in duplex stainless steel.But the one side raising of N content can cause smelts difficulty increase, hot workability declines, and causes difficulty to manufacture; On the other hand, N content raising can cause the intensity of duplex stainless steel to significantly improve, in cold-heading process and the follow-up course of processing, cause grinding tool loss serious.
From formula (1), Mn forms the half that austenitic ability makes Ni, but Mn cost is low, therefore usually adopts higher Mn content to replace Ni.But Mn has disadvantageous effect to duplex stainless steel corrosion resistance nature, as shown in Equation (2), namely often add the manganese of 1%, alloy PREN value reduction by 1 will be made.If ensure the excellent corrosion resistance nature of material, its content must be controlled.The reason that Mn affects pitting corrosion resistance is that manganese and sulphur form MnS and is mingled with, and this dissolving be mixed in corrosive medium, usually becomes the starting point of spot corrosion, crevice corrosion.
From formula (1), Cu is weak austenite former, can be used for replacing Ni.But the very important effect of Cu is stable austenite, reduces hardness and be inclined to work hardening, thus raising stainless steel cold heading performance.For duplex stainless steel, because its tissue and austenitic stainless steel exist significant difference, intensity comparatively austenitic stainless steel will significantly improve, and therefore especially needs the hardness and the work hardening tendency that reduce duplex stainless steel by adding Cu.
From the first-generation to third generation duplex stainless steel, comprise existing economical diphase stainless steel, the trend of development is that nitrogen content increases gradually, close to the solubility limit of nitrogen.It is that intensity improves that the content of nitrogen improves the direct impact brought, and the mechanics after welding and corrosion resistance nature improve.Obviously, this for needing to weld, the Application Areas of holding capacity is necessary, but then unfavorable for needing the field of cold upset forming because too high nitrogen content will cause intensity too high, cold-heading will be difficult.Therefore, the industry that current duplex stainless steel system is not adapted at needing to carry out cold-heading uses.
European patent EP 1327008 discloses a kind of austenite-ferrite duplex stainless steel, its composition range (% by weight): 0.02 ~ 0.07%C, 3.0 ~ 8.0%Mn, 19.0 ~ 23.5%Cr, 1.1 ~ 1.7%Ni, 0.1 ~ 2.0%Si, 0.15 ~ 0.3%N, the alloying element that may comprise have Mo or W being not more than 1.0%, the Cu being not more than 1.0%.Obtain successful Application in fields such as bridge, storage tank, nuclear powers at present, become the representative steel grade of economical diphase stainless steel.This steel grade is obtain high strength and excellent weldability, and N content is about 0.2%.
The Mn content of US Patent No. 4828630,4 ~ 8%, adds the N of content between 0.05 ~ 0.15% simultaneously.But its Cr content is lower, is 17 ~ 21.5%, is unfavorable for the corrosion resistance nature of material.
Chinese patent CN101215674 is typical in Mn, N economical diphase stainless steel for Ni.Consider that its Cr content is 18 ~ 20%, and not containing Mo, the PREN value of this duplex stainless steel is lower, the corrosion resisting property of material declines.Need to replace Ni completely with the Mn of 4 ~ 7% and the N of 0.15 ~ 0.3%, intensity is higher.
Mn content controls 2 ~ 4% by the economical diphase stainless steel designed by European patent EP 2258885, thus improves the corrosion resistance nature of material.The key point of this patent is to the addition of a certain amount of V, utilizes V to suppress the activity of N, thus avoids the nitride of Cr in weld heat-affected zone to separate out, thus improves erosion resistance and the impelling strength of weld seam.
For improving the corrosion resistance nature of material further, Mn content controls, below 4%, to carry high-Cr to 21 ~ 24.5% by US Patent No. 479863 simultaneously, and adds a small amount of Mo(<1%).By controlling the content of these and the closely-related alloying element of material corrosion resistance, its corrosion resistance nature can reach the level of austenitic stainless steel 316 L.This steel grade Mn, N content is lower and Ni content is higher, and cost is higher.
European patent EP 2410068A1 is a kind of for improving the duplex stainless steel that press working forming property designs.The N content of this steel grade is lower to be controlled below 0.07%, its yield strength in below 400MPa, Erichsen value at more than 11mm.
Equally, for improving the corrosion resistance nature of material further, Mo is increased to 0.5 ~ 2.5% by Chinese patent CN101090988.The compositing range of the alloy compositions of its patent application guarantees that alloy CPT is higher than 20 DEG C, and its N content is between 0.15 ~ 0.2%.
The patent of all economical diphase stainless steels does not all relate to the cold heading performance of material above.For the material needing cold-heading, require that its intensity is low, work hardening is weak, and current economical diphase stainless steel system is for pursuing economy and weldability, usually can containing higher N content, and Cu content is then lower, is not suitable for cold-heading.
Summary of the invention
The object of the invention is to provide a kind of economical diphase stainless steel and the manufacture method thereof with excellent cold heading performance, there is low cost and good cold heading performance, good corrosion resistance nature, lower intensity and work hardening rate, the industry such as stainless steel support, silk screen can be widely used in, thus replace 304 austenitic stainless steels containing 8% nickel; Yield strength after the wire rod annealing obtained, between 360 ~ 450MPa, does not ftracture when cold heading performance can ensure the cold-heading pressure of 80%.
For achieving the above object, technical scheme of the present invention is:
The present invention uses the Mn of 4 ~ 7%, and certain N replaces Ni, thus makes Ni content between 1.8 ~ 3%; For ensureing excellent cold heading performance, and reduce the strength of materials and work hardening, N content is controlled 0.08 ~ 0.15%, and add the Cu of 0.1 ~ 1.5%; For ensureing excellent corrosion resistance nature, overcoming the disadvantageous effect of Mn content to corrosion resistance nature, Cr content is controlled 21.5 ~ 23.5%, and add the Mo being less than 0.5%.
Particularly, a kind of economical diphase stainless steel with excellent cold heading performance of the present invention, its chemical component weight per-cent is: C 0.01 ~ 0.07%, Si 0.1 ~ 1.0%, Mn 4.0 ~ 7.0%, Cr21.5 ~ 23.5%, Ni 1.8 ~ 3.5%, N 0.08 ~ 0.15%, Mo 0 ~ 0.5%, Cu 0.1 ~ 1.5%, all the other are Fe and inevitable impurity.
Further, duplex stainless steel of the present invention also can to comprise in W, B more than one, W≤0.5%, B≤0.01%, weight percent meter.
In present component design:
C carbon is strong austenite former, and from formula (1), its austenitic formation effect is equivalent to 30 times of Ni, therefore can replace Ni to a certain extent, promotes the formation of austenite structure.In addition, carbon is very strong austenite stable element, and austenite can be suppressed to martensitic phase transformation.But when carbon content is too high, after carbon is combined with chromium, form rich chromium carbide at crystal boundary, cause corrosive nature significantly to decline.In addition, carbon has significant solution strengthening effect, and the too high meeting of carbon content causes the strength of materials to improve, cold-heading difficulty.And too low carbon content is by the difficulty in increase preparation process and cost.Therefore, designing carbon content in steel of the present invention is 0.01 ~ 0.07%.
Si silicon is the element usually contained in iron and steel, because silicon is good deoxidant element in fusion process, therefore contains the silicon of more than 0.1% in general dual phase steel.In duplex stainless steel, silicon is that ferrite is formed and stable element, and for balancing two phase contents, silicone content improves the corresponding raising nickel equivalent of inevitable requirement, thus increases cost.The more important thing is, silicon can accelerate the precipitation of intermetallic phase, for manufacture and use procedure unfavorable.Therefore, designing silicone content in steel of the present invention is 0.1 ~ 1.0%.
Mn manganese is a kind of relatively weak austenitic formation and stable element, and its austenitic formation effect is only the half of nickel.But manganese cost is very low, manganese therefore can be utilized to replace nickel to a certain extent.In addition the interpolation of manganese can significantly improve the solubleness of nitrogen, and therefore economical diphase stainless steel is usually containing higher Mn.But manganese is all negative on the impact of stainless erosion resistance substantially.According to the experimental formula (2) of the resistance to pitting attack performance of stainless steel, often add the manganese of 1%, alloy PREN value reduction by 1 will be made, be equivalent to counteract the Mo of the interpolation 0.3% or Cr of 1% to the raising of pitting resistance.For taking into account cost and the corrosion resistance nature of material, in steel of the present invention, control Mn content is 4.0 ~ 7.0%.
Cr chromium is the most important element that stainless steel obtains corrosion resistance nature, and be also a kind of ferrite former, therefore Cr is most important alloying element in duplex stainless steel.For duplex stainless steel, when chromium content is lower, solidity to corrosion will decline; In addition austenitic stability declines, and cold-heading difficulty, therefore the minimum control of Cr content of the present invention is 21.5%.But when chromium too high levels, not only can increase the precipitation tendency of intermetallic phase, carbide and nitride, and for reaching ferrite and the balance of austenite phase, austenite former content will be increased, thus increase cost.Therefore in steel of the present invention, Cr content is the highest controls 23.5%.
Ni nickel is austenizer main in austenitic stainless steel and duplex stainless steel.And the impelling strength of steel can be improved, reduce the ductil-brittle transition temperature of steel.Along with nickel content increases, impelling strength especially low-temperature impact toughness significantly improves.But because nickel is expensive, be the principal element determining stainless steel production cost, therefore in steel of the present invention, nickel content controls 1.8% ~ 3.5%.
N nitrogen element is indispensable in modern duplex stainless steel, most important alloying element.First N is the element of a kind of formation and stable austenite phase.In austenite equivalent calculation formula (1), the austenitic formation ability of nitrogen is 30 times of nickel.Secondly, nitrogen can improve the corrosion resistance nature of austenite phase, especially resistance to pitting attack performance and slit and corrosion resistant performance, and in the calculation formula (2) of PREN value, its equivalent of resistance to spot corrosion is 30 times of chromium.In addition, the cost of nitrogen is extremely low, and therefore replacing Ni with it can significantly reduce costs.But nitrogen is also very strong solution strengthening element, will intensity and the hardness of duplex stainless steel be significantly improved, disadvantageous effect will be caused to cold-heading.Too high nitrogen content also can will increase the risk of nitride formation, and reduce toughness and the solidity to corrosion of material, high nitrogen content can improve melting and hot worked difficulty simultaneously, causes being difficult to produce on existing product line.Therefore, nitrogen in steel content of the present invention controls 0.08 ~ 0.15%.
Mo molybdenum is very beneficial for the corrosion resistance nature improving steel, especially when with chromium compound action.According to RREN value calculation formula (2), its equivalent of resistance to spot corrosion is 3.3 times of chromium.Its mechanism is stable passive film and the enrichment of promotion chromium element in passive film.For controlling the cost of material, and ensure the corrosion resistance nature of material excellence, Mo content is controlled below 0.5%.
Cu copper is a kind of more weak austenite former, can Substitute For Partial nickel, reduces costs.What is more important, Cu is the alloying element of stable austenite, and austenite can be suppressed to martensitic transformation, thus reduces austenite cold hardening speed, improves cold heading performance.Therefore, a certain amount of Cu must be added in the present invention.But be unfavorable for hot workability during copper too high levels.Therefore in steel of the present invention, Cu content controls between 0.1-1.5%.
W tungsten is one of optional element in the present invention.The effect of tungsten in dual phase steel is similar to molybdenum, can improve the corrosion resistance nature of steel.Tungsten can also reduce the activity at austenite/ferritic phase interface, suppresses the formation of intermetallic phase.But promote when W content is too high that intermetallic phase generates on the contrary.Therefore in steel of the present invention, W content controls below 0.5%.
B boron is also one of optional element of the present invention.Adding mainly for improving the hot workability of duplex stainless steel of boron.But B too high levels can cause the compound forming B in duplex stainless steel, serious plasticity and the toughness reducing material.Therefore in the present invention, B content controls below 0.01%.
A kind of manufacture method with the economical diphase stainless steel of excellent cold heading performance of the present invention, comprises the following steps:
1) smelt
Smelt by following composition,
Duplex stainless steel, its chemical component weight per-cent is: C 0.01 ~ 0.07%, Si 0.1 ~ 1.0%, Mn 4.0 ~ 7.0%, Cr 21.5 ~ 23.5%, Ni 1.8 ~ 3.5%, N 0.08 ~ 0.15%, Mo 0 ~ 0.5%, Cu 0.1 ~ 1.5%, all the other are Fe and inevitable impurity; Smelting process selects vacuum induction to smelt, and electric furnace-argon oxygen decarburization AOD or electric furnace-argon oxygen decarburization AOD-external refining LF stove are smelted;
2) cast
Molten steel is carried out die casting or continuous casting, and controlling superheating temperature during die casting is 20 ~ 50 DEG C, and ingot casting need through just rolling into bloom; Or employing continuous cast method, for avoiding the effusion of nitrogen, controlling superheating temperature during continuous casting is 20 ~ 50 DEG C, and slab pulling rate is 0.8 ~ 2m/min;
3) rolling
To bloom or continuously cast bloom heating, Heating temperature is to 1000 ~ 1200 DEG C and be incubated, and bar and wire rod rolling process unit is rolled into the Bar Wire Product of required specification;
4) solution treatment and pickling, its solid solution temperature controls at 1000 ~ 1130 DEG C; For ensureing surface quality, carry out salt bath pickling to the material after solid solution, salt temperature is 300 ~ 500 DEG C;
Further, described duplex stainless steel also to comprise in W, B more than one, W≤0.5%, B≤0.01%, weight percent meter.
In duplex stainless steel of the present invention, N content is lower than 0.15%, and thermoplasticity is better, can carry out the production of gren rod; Add certain Cu, the cold working characteristic had, the production of cold-drawn wire rod etc. can be carried out.Consider the balance of austenite element and ferrite element, for obtaining suitable two-phase proportion, the annealing temperature of hot rolling and cold-drawn controls between 1000 ~ 1130 DEG C.Consider that Cr content of the present invention is greater than 21.5%, Mn content and is greater than 4%, oxidation characteristic is variant with conventional stainless steel, adopts conventional acid cleaning process to be difficult to remove surface scale.For the surface quality obtained, carry out salt bath cleanup acid treatment to material, salt temperature is 300 ~ 500 DEG C.
The present invention is compared with prior art:
The basic ideas of existing economical diphase stainless steel Composition Design, for being main added elements with Cr, Mn, Ni, N etc., replace Ni by Mn and N.Namely patent CN101215674, EP1327008 are typical high Mn, the high N economical diphase stainless steel designs for Ni, and Mn content is higher, and Ni content is below 1.7%.For improving the corrosion resistance nature of material further, then must suitably reduce Mn content, or improve Cr, Mo content.Patent CN101090988, is increased to more than 0.5% by Mo content; Patent US6551420B1, is increased to more than 1.4% by Mo content; Mn content then controls below 4% by patent US5672215, US4798635, and suitably carries high-Cr; For improving welding property further, patent EP 2258885 also added certain V.
The present invention obtains lower cost, and the Mn by 4 ~ 7% carrys out alternative Ni; For ensureing the corrosion resistance nature of alloy, Cr content being controlled 21.5 ~ 23.5%, adding the Mo being less than 0.5 simultaneously; For obtaining good cold-forming property, especially cold heading performance, controls N content below 0.15%, and adds the Cu being less than 1.5%.
Beneficial effect of the present invention:
1, utilize the Mn of 4.0 ~ the 7.0% and N of 0.08 ~ 0.15% to carry out alternative Ni, Ni content is controlled 1.8 ~ 3.5%, both ensured impelling strength under the low temperature of alloy, significantly fallen low-alloyed material cost again.
2, Mn content is controlled to 4.0 ~ 7.0%, for compensating manganese to the disadvantageous effect of corrosion resistance nature; Cr content is controlled 21.5 ~ 23.5%.Add the Mo being less than 0.5% and improve corrosion resistance nature further.
3, N content is controlled 0.08 ~ 0.15%, add the Cu of 0.1 ~ 1.5% simultaneously, reduce intensity and the work hardening rate of material, thus improve cold heading performance, also can ensure that material has the processing characteristics such as good cold-drawn.
4, duplex stainless steel of the present invention can utilize existing stainless steel to produce line batch production.
5, alloy has excellent cold heading performance and lower yield strength.Gren rod annealing after yield strength between 360 ~ 450MPa, more traditional economical diphase stainless steel strength degradation about 15%; Its cold heading performance does not ftracture when can ensure the cold-heading pressure of 80%.
Accompanying drawing explanation
Fig. 1 is embodiments of the invention 1 alloy microstructures.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described.
The embodiment of the present invention is for the Production Flow Chart of electric furnace-AOD-continuous casting and hot rolling-annealing and pickling:
Ferrochrome, ferronickel and steel scrap etc. are added electric furnace, melts together with molten iron, subsequently molten steel is poured into AOD furnace, the blowing of de-C, de-O, de-S and increasing N, control N is carried out in AOD furnace, when smelting composition and reaching requirement, pour molten steel into tundish, and cast on vertical-bending caster.The superheating temperature of continuous casting is 20 ~ 50 DEG C, and slab pulling rate is 0.8 ~ 2m/min.Continuous casting square billet is put into process furnace and be heated to 1000 ~ 1200 DEG C, bar and wire rod rolling process unit is rolled down to the Bar Wire Product of required specification.Then carry out solution treatment and pickling, solid solution temperature controls at 1000 ~ 1130 DEG C, thus obtains suitable ferritic-austenitic duplex structure organization and non-scale surface.
Table 1 is depicted as the chemical composition of embodiment of the present invention alloy, and table 2 is embodiment of the present invention manufacturing process and alloy property.
Table 1 gives the economical diphase stainless steel S32101 stainless steel developed at present as a comparison case simultaneously, and hope steel grade of the present invention carries out the chemical composition of 304 austenitic stainless steels substituted in certain fields.Its unit elongation records according to GB/T 228-2007, and pitting potential records according to GB/T17899-1999.
The metallographic structure of the alloy cross section of embodiment 1 as shown in Figure 1.Carry out electrolytic corrosion by after sample polishing also polishing, etching reagent is 40GKOH+100mlH
2o, corrosion current 0.3 ~ 0.8A/cm
2, finally by Quantitative metallography, austenite ratio is analyzed under metaloscope.In figure, dark structure is ferrite, and white tissues is austenite, and austenite accounts for 43% mutually.
Carry out alternative Ni by the visible steel of the present invention of table 1 owing to utilizing the Mn of 4.0 ~ the 7.0% and N of 0.08 ~ 0.15%, compare containing Ni reach 8% 304 austenitic stainless steels more economical; Compare existing economical diphase stainless steel, owing to reducing N content, improve Cu content, its yield strength declines, and cold heading performance improves.
Table 1 unit: weight percent
Table 2
In sum, the present invention uses the Mn of 4 ~ 7%, and certain N replaces Ni, thus makes Ni content between 1.8 ~ 3%, controls N content 0.08 ~ 0.15%, and adds the Cu of 0.1 ~ 1.5%; Cr content controls 21.5 ~ 23.5%, and adds the Mo being less than 0.5%.Yield strength after the wire rod annealing obtained, between 360 ~ 450MPa, does not ftracture when cold heading performance can ensure the cold-heading pressure of 80%.
Claims (4)
1. one kind has the economical diphase stainless steel of excellent cold heading performance, its chemical component weight per-cent is: C 0.01 ~ 0.07%, Si 0.1 ~ 1.0%, Mn 4.0 ~ 7.0%, Cr 21.5 ~ 23.5%, Ni 1.8 ~ 3.5%, N 0.08 ~ 0.15%, Mo 0 ~ 0.5%, Cu 0.1 ~ 1.5%, all the other are Fe and inevitable impurity; And adopt following manufacture method, comprising:
1) smelt
Smelt by mentioned component, smelting process selects vacuum induction to smelt, and electric furnace-argon oxygen decarburization AOD or electric furnace-argon oxygen decarburization AOD-external refining LF stove are smelted;
2) cast, adopt die casting or continuous casting
Controlling superheating temperature during die casting is 20 ~ 50 DEG C, and ingot casting is through just rolling into square billet; Controlling superheating temperature during continuous casting is 20 ~ 50 DEG C, and continuously cast bloom pulling rate is 0.8 ~ 2m/min;
3) rolling
To bloom or continuously cast bloom heating, Heating temperature is to 1000 ~ 1200 DEG C and be incubated, and bar and wire rod rolling process unit is rolled into the Bar Wire Product of required specification;
4) solution treatment and pickling, solid solution temperature controls at 1000 ~ 1130 DEG C; For ensureing surface quality, adopt salt bath pickling to the material after solid solution, salt temperature is 300 ~ 500 DEG C.
2. there is the economical diphase stainless steel of excellent cold heading performance as claimed in claim 1, it is characterized in that, also to comprise in W, B more than one, W≤0.5%, B≤0.01%, weight percent meter.
3. there is a manufacture method for the economical diphase stainless steel of excellent cold heading performance, comprise the following steps:
1) smelt
Smelt by following composition, the chemical component weight per-cent of duplex stainless steel is: C 0.01 ~ 0.07%, Si 0.1 ~ 1.0%, Mn 4.0 ~ 7.0%, Cr 21.5 ~ 23.5%, Ni 1.8 ~ 3.5%, N 0.08 ~ 0.15%, Mo 0 ~ 0.5%, Cu 0.1 ~ 1.5%, all the other are Fe and inevitable impurity; Smelting process selects vacuum induction to smelt, and electric furnace-argon oxygen decarburization AOD or electric furnace-argon oxygen decarburization AOD-external refining LF stove are smelted;
2) cast, adopt die casting or continuous casting
Controlling superheating temperature during die casting is 20 ~ 50 DEG C, and ingot casting is through just rolling into square billet; Controlling superheating temperature during continuous casting is 20 ~ 50 DEG C, and continuously cast bloom pulling rate is 0.8 ~ 2m/min;
3) rolling
To bloom or continuously cast bloom heating, Heating temperature is to 1000 ~ 1200 DEG C and be incubated, and bar and wire rod rolling process unit is rolled into the Bar Wire Product of required specification;
4) solution treatment and pickling, solid solution temperature controls at 1000 ~ 1130 DEG C; For ensureing surface quality, adopt salt bath pickling to the material after solid solution, salt temperature is 300 ~ 500 DEG C.
4. have the manufacture method of the economical diphase stainless steel of excellent cold heading performance as claimed in claim 3, it is characterized in that, described duplex stainless steel also to comprise in W, B more than one, W≤0.5%, B≤0.01%, weight percent meter.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613839A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | A kind of high nitrogen and low nickel duplex stainless steel and manufacture method thereof |
| CN101918606A (en) * | 2008-01-22 | 2010-12-15 | 新日铁住金不锈钢株式会社 | Ferrite-austenite stainless steel sheet for structural members excellent in workability and impact absorption characteristics and process for the production of the sheet |
| CN102251194A (en) * | 2010-05-18 | 2011-11-23 | 宝山钢铁股份有限公司 | Two-phase stainless steel cold-rolled sheet with good surface corrosion resistance, and preparation method thereof |
-
2012
- 2012-06-01 CN CN201210179479.0A patent/CN102719767B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101918606A (en) * | 2008-01-22 | 2010-12-15 | 新日铁住金不锈钢株式会社 | Ferrite-austenite stainless steel sheet for structural members excellent in workability and impact absorption characteristics and process for the production of the sheet |
| CN101613839A (en) * | 2008-06-23 | 2009-12-30 | 宝山钢铁股份有限公司 | A kind of high nitrogen and low nickel duplex stainless steel and manufacture method thereof |
| CN102251194A (en) * | 2010-05-18 | 2011-11-23 | 宝山钢铁股份有限公司 | Two-phase stainless steel cold-rolled sheet with good surface corrosion resistance, and preparation method thereof |
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