CN105002431A - Chrome-manganese-nitrogen austenitic stainless steel and preparation method thereof - Google Patents
Chrome-manganese-nitrogen austenitic stainless steel and preparation method thereof Download PDFInfo
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- CN105002431A CN105002431A CN201510424465.4A CN201510424465A CN105002431A CN 105002431 A CN105002431 A CN 105002431A CN 201510424465 A CN201510424465 A CN 201510424465A CN 105002431 A CN105002431 A CN 105002431A
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Abstract
The invention discloses chrome-manganese-nitrogen austenitic stainless steel. The chrome-manganese-nitrogen austenitic stainless steel is characterized by comprising, by weight ratio, 0.50%-0.70% of carbon (C), silicon (Si) smaller than or equal to 0.25%, 9.0%-12.0% of manganese (Mn), 18.5%-23.5% of chrome (Cr), 0.4%-0.8% of nitrogen (N), 0.75%-1.8% of molybdenum (Mo) and the balance Fe and inevitable impurities. A duplex metallurgy method is adopted, that is, medium-frequency induction furnace smelting is combined with AOD converting, and the content of the nitrogen in mother alloy is guaranteed. The stainless steel has the high mechanical property; especially niobium and vanadium are added, so that the strength of the mother alloy of the austenitic stainless steel is improved; meanwhile, cooperation of refined grains of a casting is achieved, prefect consistency of strength and plasticity is embodied, and the chrome-manganese-nitrogen austenitic stainless steel is especially suitable for mother alloy casting.
Description
Technical field
The present invention relates to austenitic stainless steel technical field, especially a kind of chromium-manganese-nitrogen austenitic stainless steel and preparation method thereof.
Background technology
General austenitic stainless steel is all containing certain nickel, and nickel is the one of the chief elements of austenitizing, and its main effect is formed and stable austenite, makes stainless steel obtain good intensity, plasticity and toughness.The nickel element that the need of production consumption of austenitic stainless steel is a large amount of, nickel is the more rare and expensive rare elements of one, the development of the shaped material that is unfavorable for economizing on resources, and nickel element has potential sensitization, has teratogenesis, the harm such as carcinogenic to organism.Therefore develop and replace the low nickel of nickel or minimizing nickel content and nickel-less austenitic stainless steel to be not only conducive to reducing costs with other elements, also can improve stainless safety in utilization.Chromic manganese nitrogen series stainless steel replaces Ni with Mn-N, and material cost significantly reduces.
Chinese patent CN200610051695.1, CN200710163986.4, CN200710146063.8, CN200610103367.1, CN201310281613.2, CN201310281614.7 etc. disclose the austenitic stainless steel preparation method that employing manganese-nitrogen etc. replaces nickel, wherein nickel content is between 0.5%-3.5%, these technology reduce the nickel content in austenitic stainless steel to a certain extent, but still containing a small amount of nickel.Current commercial chromium-manganese-nitrogen stainless steel mostly containing a small amount of nickel, as 0Cr18Mn13Ni3N, because this type of alloy adopts single melting to control not reach requirements at the higher level to the content of nitrogen, so containing a small amount of nickel, performance tensile strength and solidity to corrosion not ideal enough.
Therefore, nitrogen content reaches desirable without nickel to be necessary to provide one, and strength property is better than again existing commercial alloy, is particularly applicable to the mother alloy cast, to solve many defects that existing business chromium-manganese-nitrogen stainless steel exists.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of not nickeliferous chromium-manganese-nitrogen austenitic stainless steel and preparation method thereof.
In order to achieve the above object, the present invention is by the following technical solutions:
A kind of chromium-manganese-nitrogen austenitic stainless steel, it is characterized in that, its chemical composition comprises by weight:
Surplus is Fe and inevitable impurity.
Preferably, described inevitable impurity comprises phosphorus (P) and sulphur (S), by stainless steel total mass, wherein P≤0.035%, and S≤0.030%.
Preferably, described stainless steel also comprises the vanadium (V) accounting for stainless steel total mass 0.5-1.5%.
Preferably, described stainless steel also comprises the niobium (Nb) accounting for stainless steel total mass 1.0-2.5%.
Prepare a method for above-mentioned chromium-manganese-nitrogen austenitic stainless steel, it is characterized in that, comprise the following steps:
(1) above-mentioned for preparation stainless raw material is dropped in antivacuum medium-frequency induction furnace carry out melting, obtain molten steel;
(2) molten steel obtained through step (1) melting is proceeded to blowing in Ar-O_2 furnace (AOD);
(3) molten steel after step (2) blowing is proceeded in tundish, by horizontal casting method, molten steel is pulled into the mother alloy pole that diameter is 100mm;
(4), after the mother alloy pole obtained through step (3) continuous casting being proceeded in medium-frequency induction furnace melting again, precision casting becomes various spray.
Preferably, the chemical composition of the molten steel obtained through step (1) melting comprises carbon (C) 0.50-0.70% by weight, silicon (Si)≤0.25%, manganese (Mn) 9.0-12.0%, chromium (Cr) 18.5-23.5%, nitrogen (N) 0.4-0.8%, molybdenum (Mo) 0.75-1.85%, vanadium (V) 0.5-1.5%, niobium (Nb) 1.0-2.5%, surplus is Fe and inevitable impurity.
Preferably, in step (1), smelting time is 135-140min, and temperature is 1480-1580 DEG C, normal pressure.
Preferably, in step (2) molten steel converting process, need the content controlling chromium, manganese, nitrogen.
Preferably, in step (2), duration of blast is 15-20min.
Preferably, the mother alloy pole of step (4), in medium-frequency induction furnace, is heated to 1030 ± 10 DEG C, chilling solution treatment.
The present invention carries out alloying with manganese and nitrogen element, makes it to form single austenite structure structure, and simultaneously because the solution strengthening of nitrogen can improve the intensity of this alloy, suitable manufacture is born has certain corrosion proof various cast member compared with heavy loading.Nitrogen is one of important meals element making alloy austenite, and its ability suppressing ferrite to be formed is 30 times of nickel, can not obtain complete austenite structure with alloying of manganese, only has their cda alloy to turn into forming stable austenite matrix.
Austenitic stainless cast steel part normally uses under higher stress condition, and in order to improve the work-ing life of foundry goods, the present invention also added niobium and vanadium.Niobium can improve alloy strength (Mpa), and it in the alloy can fixed carbon, plays precipitation hardening effect, thus put forward heavy alloyed creep property, and niobium also has Grain refinement simultaneously, thus also can put forward heavy alloyed impelling strength.Because niobium is by the Dispersed precipitate of tiny carbide particle, in austenitic alloy, can prevent oxidizing medium from corroding between lattice.
Vanadium is strong carbonization and nitrogen element forming element, forms carbide particle Dispersed precipitate, put forward heavy alloyed creep properties and persistence with carbon, makes cast product while possessing higher-strength due to grain refining, keeps good plasticity and toughness.
The present invention adopts duplex to control golden method, and namely antivacuum Medium frequency induction melting adds Ar-O_2 furnace (AOD) blowing technology, while control nitrogen element, makes the chemical composition of alloy obtain fine homogeneity and consistence.
Chromium-manganese-nitrogen stainless steel mother alloy without nickel disclosed by the invention, there is higher mechanical property, particularly add the cooperation reaching foundry goods crystal grain thinning while niobium and vanadium make austenitic stainless steel mother alloy improve intensity, embody intensity perfect consistent with plasticity, be specially adapted to cast master alloy and use.
Embodiment
Embodiment 1
A kind of chromium-manganese-nitrogen austenitic stainless steel, it is characterized in that, its chemical composition comprises by weight:
Prepare a method for above-mentioned chromium-manganese-nitrogen austenitic stainless steel, it is characterized in that, comprise the following steps:
(1) dropped in antivacuum medium-frequency induction furnace by above-mentioned for preparation stainless raw material and carry out melting, smelting time is 140min, and temperature is 1500 DEG C, and normal pressure, obtains molten steel;
(2) molten steel obtained through step (1) melting is proceeded to blowing in Ar-O_2 furnace (AOD), need the content controlling chromium, manganese, nitrogen, blowing 20min, nitrogen accounts for 0.42% of quality of molten steel;
(3) molten steel after step (2) blowing is proceeded in tundish, by horizontal casting method, molten steel is pulled into the mother alloy pole that diameter is 100mm;
(4) proceed in medium-frequency induction furnace by the mother alloy pole obtained through step (3) continuous casting, be heated to 1030 ± 10 DEG C, after chilling solid solution, precision casting becomes various spray.
Embodiment 2
A kind of chromium-manganese-nitrogen austenitic stainless steel, it is characterized in that, its chemical composition comprises by weight:
Prepare a method for above-mentioned chromium-manganese-nitrogen austenitic stainless steel, it is characterized in that, comprise the following steps:
(1) dropped in antivacuum medium-frequency induction furnace by above-mentioned for preparation stainless raw material and carry out melting, smelting time is 140min, and temperature is 1580 DEG C, and normal pressure, obtains molten steel;
(2) molten steel obtained through step (1) melting is proceeded to blowing in Ar-O_2 furnace (AOD), need the content controlling chromium, manganese, nitrogen, blowing 20min, nitrogen accounts for 0.51% of quality of molten steel;
(3) molten steel after step (2) blowing is proceeded in tundish, by horizontal casting method, molten steel is pulled into the mother alloy pole that diameter is 100mm;
(4) proceed in medium-frequency induction furnace by the mother alloy pole obtained through step (3) continuous casting, be heated to 1030 ± 10 DEG C, after chilling solid solution, precision casting becomes various spray.
Embodiment 3
A kind of chromium-manganese-nitrogen austenitic stainless steel, it is characterized in that, its chemical composition comprises by weight:
Prepare a method for above-mentioned chromium-manganese-nitrogen austenitic stainless steel, it is characterized in that, comprise the following steps:
(1) dropped in antivacuum medium-frequency induction furnace by above-mentioned for preparation stainless raw material and carry out melting, smelting time is 140min, and temperature is 1580 DEG C, and normal pressure, obtains molten steel;
(2) molten steel obtained through step (1) melting is proceeded to blowing in Ar-O_2 furnace (AOD), need the content controlling chromium, manganese, nitrogen, blowing 20min, nitrogen accounts for 0.51% of quality of molten steel;
(3) molten steel after step (2) blowing is proceeded in tundish, by horizontal casting method, molten steel is pulled into the mother alloy pole that diameter is 100mm;
(4) proceed in medium-frequency induction furnace by the mother alloy pole obtained through step (3) continuous casting, be heated to 1030 ± 10 DEG C, after chilling solid solution, precision casting becomes various spray.
Embodiment 4
A kind of chromium-manganese-nitrogen austenitic stainless steel, it is characterized in that, its chemical composition comprises by weight:
Prepare a method for above-mentioned chromium-manganese-nitrogen austenitic stainless steel, it is characterized in that, comprise the following steps:
(1) dropped in antivacuum medium-frequency induction furnace by above-mentioned for preparation stainless raw material and carry out melting, smelting time is 140min, and temperature is 1500 DEG C, and normal pressure, obtains molten steel;
(2) molten steel obtained through step (1) melting is proceeded to blowing in Ar-O_2 furnace (AOD), need the content controlling chromium, manganese, nitrogen, blowing 20min, nitrogen accounts for 0.69% of quality of molten steel;
(3) molten steel after step (2) blowing is proceeded in tundish, by horizontal casting method, molten steel is pulled into the mother alloy pole that diameter is 100mm;
(4) proceed in medium-frequency induction furnace by the mother alloy pole obtained through step (3) continuous casting, be heated to 1030 ± 10 DEG C, after chilling solid solution, precision casting becomes various spray.
The stainless steel of embodiment 1-4 and currently available products 0Cr18Mn13Ni3N, the chemical composition comprised is as shown in table 1.
Embodiment 5
The stainless steel that embodiment 1-4 is obtained and currently available products 0Cr18Mn13Ni3N carry out performance test, and test result is as shown in table 2.
Table 1 embodiment 1-4 and currently available products 0Cr18Mn13Ni3N comprise chemical composition
Note: the mass ratio excluding S and P in embodiment 1-4 and commercially available prod 0Cr18Mn13Ni3N in table 1, also excludes the mass ratio of Ni in the 0Cr18Mn13Ni3N of commercially available prod.
The stainless steel that table 2 embodiment 1-4 is obtained and currently available products 0Cr18Mn13Ni3N the performance test results
Claims (10)
1. chromium-manganese-nitrogen austenitic stainless steel, is characterized in that, its chemical composition comprises by weight:
Surplus is Fe and inevitable impurity.
2. chromium-manganese-nitrogen austenitic stainless steel according to claim 1, is characterized in that, described inevitable impurity comprises phosphorus (P) and sulphur (S), by stainless steel total mass, wherein P≤0.035%, and S≤0.030%.
3. chromium-manganese-nitrogen austenitic stainless steel according to claim 1, is characterized in that, described stainless steel also comprises the vanadium (V) accounting for stainless steel total mass 0.5-1.5%.
4. chromium-manganese-the nitrogen austenitic stainless steel according to claim 1 or 3, is characterized in that, described stainless steel also comprises the niobium (Nb) accounting for stainless steel total mass 1.0-2.5%.
5. prepare a method for the chromium-manganese-nitrogen austenitic stainless steel described in above-mentioned any one claim, it is characterized in that, comprise the following steps:
(1) the stainless raw material described in preparation the claims is dropped in antivacuum medium-frequency induction furnace and carries out melting, obtain molten steel;
(2) molten steel obtained through step (1) melting is proceeded to blowing in Ar-O_2 furnace (AOD);
(3) molten steel after step (2) blowing is proceeded in tundish, by horizontal casting method, molten steel is pulled into the mother alloy pole that diameter is 100mm;
(4), after the mother alloy pole obtained through step (3) continuous casting being proceeded in medium-frequency induction furnace melting again, precision casting becomes various spray.
6. the method preparing chromium-manganese-nitrogen austenitic stainless steel according to claim 5, it is characterized in that, the chemical composition of the molten steel obtained through step (1) melting comprises carbon (C) 0.50-0.70% by weight, silicon (Si)≤0.25%, manganese (Mn) 9.0-12.0%, chromium (Cr) 18.5-23.5%, nitrogen (N) 0.4-0.8%, molybdenum (Mo) 0.75-1.85%, vanadium (V) 0.5-1.5%, niobium (Nb) 1.0-2.5%, surplus is Fe and inevitable impurity.
7. the method preparing chromium-manganese-nitrogen austenitic stainless steel according to claim 5 or 6, is characterized in that, in step (1), smelting time is 135-140min, and temperature is 1480-1580 DEG C, normal pressure.
8. the method preparing chromium-manganese-nitrogen austenitic stainless steel according to claim 5, is characterized in that, in step (2) molten steel converting process, needs the content controlling chromium, manganese, nitrogen.
9. the method preparing chromium-manganese-nitrogen austenitic stainless steel according to claim 5 or 8, is characterized in that, in step (2), duration of blast is 15-20min.
10. the method preparing chromium-manganese-nitrogen austenitic stainless steel according to claim 5, is characterized in that, the mother alloy pole of step (4), in medium-frequency induction furnace, is heated to 1030 ± 10 DEG C, chilling solution treatment.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106244940A (en) * | 2016-08-26 | 2016-12-21 | 天津新伟祥工业有限公司 | A kind of Cr-Mn-N series austenitic heat-resistance steel and preparation method thereof |
| CN111519006A (en) * | 2020-04-24 | 2020-08-11 | 深圳市泛海统联精密制造股份有限公司 | Vacuum solid solution method for high manganese nitrogen nickel-free stainless steel |
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| US2909425A (en) * | 1957-05-31 | 1959-10-20 | Crucible Steel Co America | Austenitic cr-mn-c-n steels for elevated temperature service |
| CN101353768A (en) * | 2008-09-26 | 2009-01-28 | 北京科技大学 | Nitrogen-containing nickel-free stainless steel and metallurgy forming process for powder thereof |
| CN101532115A (en) * | 2009-04-16 | 2009-09-16 | 宁波耀义不锈钢有限公司 | Non-nickel austenite stainless steel |
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| US2909425A (en) * | 1957-05-31 | 1959-10-20 | Crucible Steel Co America | Austenitic cr-mn-c-n steels for elevated temperature service |
| CN101353768A (en) * | 2008-09-26 | 2009-01-28 | 北京科技大学 | Nitrogen-containing nickel-free stainless steel and metallurgy forming process for powder thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106244940A (en) * | 2016-08-26 | 2016-12-21 | 天津新伟祥工业有限公司 | A kind of Cr-Mn-N series austenitic heat-resistance steel and preparation method thereof |
| US10941470B2 (en) | 2016-08-26 | 2021-03-09 | Tianjin New Wei San Industrial Co., Ltd. | Cr-Mn-N austenitic heat-resistant steel and a method for manufacturing the same |
| CN111519006A (en) * | 2020-04-24 | 2020-08-11 | 深圳市泛海统联精密制造股份有限公司 | Vacuum solid solution method for high manganese nitrogen nickel-free stainless steel |
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