CN105002431B - A kind of chromium-manganese-nitrogen austenitic stainless steel and preparation method thereof - Google Patents
A kind of chromium-manganese-nitrogen austenitic stainless steel and preparation method thereof Download PDFInfo
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- CN105002431B CN105002431B CN201510424465.4A CN201510424465A CN105002431B CN 105002431 B CN105002431 B CN 105002431B CN 201510424465 A CN201510424465 A CN 201510424465A CN 105002431 B CN105002431 B CN 105002431B
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Abstract
The invention discloses a kind of chromium-manganese-nitrogen austenitic stainless steel, it is characterised in that its chemical composition includes by weight：Carbon (C) 0.50 0.70%, 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%, balance of Fe and inevitable impurity.The present invention controls golden method, i.e. intermediate frequency furnace melting and adds AOD to blow using duplex, it is ensured that the content of nitrogen in foundry alloy.Stainless steel of the invention has mechanical performance higher, particularly adds niobium and vanadium to make austenitic stainless steel foundry alloy that the cooperation of casting crystal grain thinning is reached while improving intensity, and it is consistent with plasticity perfection to embody intensity, is particularly well-suited to cast master alloy and uses.
Description
Technical field
The present invention relates to austenitic stainless steel technical field, especially a kind of chromium-manganese-nitrogen austenitic stainless steel and its preparation
Method.
Background technology
General austenitic stainless steel contains certain nickel, and nickel is the one of the chief elements of austenitizing, its main effect
It is to be formed and stable austenite, stainless steel is obtained good intensity, plasticity and toughness.The production of austenitic stainless steel needs to disappear
Substantial amounts of nickel element is consumed, nickel is a kind of more rare and expensive rare element, the development of the section bar material that is unfavorable for economizing on resources,
And nickel element has potential sensitization, there is teratogenesis, carcinogenic etc. to endanger to organism.Therefore development is replaced with other elements
The low nickel and nickel-less austenitic stainless steel of nickel or reduction nickel content not only contribute to reduces cost, can also improve the use of stainless steel
Security.Chromic manganese nitrogen series stainless steel replaces Ni with Mn-N, and material cost is significantly reduced.
Chinese patent CN200610051695.1, CN200710163986.4, CN200710146063.8,
CN200610103367.1, CN201310281613.2, CN201310281614.7 etc. are disclosed and are replaced nickel using manganese-nitrogen etc.
Between 0.5%-3.5%, these technologies reduce Austria to a certain extent for austenitic stainless steel preparation method, wherein nickel content
Nickel content in family name's body stainless steel, but still contain a small amount of nickel.Commercialization chromium-manganese-nitrogen stainless steel contains a small amount of nickel mostly at present,
Such as 0Cr18Mn13Ni3N, because such alloy is to control not reaching requirements at the higher level to the content of nitrogen using single melting, so containing
There is a small amount of nickel, performance tensile strength and corrosion resistance are not ideal enough.
Therefore, it is necessary to provide one kind, without nickel, nitrogen content reaches desirable, and strength character is closed better than existing business again
Gold, is particularly suitable for the foundry alloy of casting, to solve many defects that existing business chromium-manganese-nitrogen stainless steel is present.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention 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 uses following technical scheme：
A kind of chromium-manganese-nitrogen austenitic stainless steel, it is characterised in that its chemical composition includes by weight：
Balance of Fe and inevitable impurity.
Preferably, described inevitable impurity includes phosphorus (P) and sulphur (S), based on stainless steel gross mass, wherein P≤
0.035%, S≤0.030%.
Preferably, described stainless steel is also comprising the vanadium (V) for accounting for stainless steel gross mass 0.5-1.5%.
Preferably, described stainless steel is also comprising the niobium (Nb) for accounting for stainless steel gross mass 1.0-2.5%.
A kind of method for preparing above-mentioned chromium-manganese-nitrogen austenitic stainless steel, it is characterised in that comprise the following steps：
(1) melting is carried out in the raw material antivacuum intermediate frequency furnace of input that above-mentioned stainless steel will be prepared, molten steel is obtained；
(2) molten steel obtained by step (1) melting is transferred in Ar-O_2 furnace (AOD) and is blown；
(3) will be transferred in tundish by the molten steel after step (2) blowing, by horizontal casting method, molten steel is pulled into directly
Footpath is the foundry alloy pole of 100mm；
(4) in intermediate frequency furnace being transferred to by the foundry alloy pole that step (3) continuous casting is obtained again after melting, precision casting
Cause various sprays.
Preferably, the chemical composition of the molten steel for being obtained by step (1) melting is by weight comprising carbon (C) 0.50-
0.70%, 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%, balance of Fe and inevitable impurity.
Preferably, smelting time is 135-140min in step (1), and temperature is 1480-1580 DEG C, normal pressure.
Preferably, it is necessary to control the content of chromium, manganese, nitrogen in step (2) molten steel converting process.
Preferably, duration of blast is 15-20min in step (2).
Preferably, the foundry alloy pole of step (4) is heated to 1030 ± 10 DEG C, at chilling solid solution in intermediate frequency furnace
Reason.
The present invention is to carry out alloying with manganese and nitrogen, is allowed to form single austenite structure structure, simultaneously because
The solution strengthening of nitrogen can improve the intensity of the alloy, and suitable manufacture bears have certain corrosion proof various castings compared with heavy load
Forging piece.Nitrogen is to make one of important meals element of alloy austenite, and the ability that it suppresses ferrite formation is 30 times of nickel, is used
Alloying of manganese can not possibly obtain complete austenite structure, and only their cda alloyization effect could form stable austenite base
Body.
Austenitic stainless cast steel part is typically what is used under the conditions of higher stress, in order to improve the service life of casting,
The present invention also added niobium and vanadium.Niobium can be with improve alloy strength (Mpa), and it in the alloy being capable of fixed carbon, a precipitation-hardening
Effect, so as to improve the croop property of alloy, while niobium also has Grain refinement, thus can also improve the impact of alloy
Toughness.Due to the Dispersed precipitate that niobium passes through tiny carbide particle, in austenitic alloy, oxide isolation can be prevented to lattice
Between corrode.
Vanadium is strong carbonization and nitrogen formation element, and carbide particle Dispersed precipitate is formed with carbon, improves the creep of alloy
Property and persistence, make cast product while possessing higher-strength due to crystal grain refinement, keep preferable plasticity and toughness.
The present invention controls golden method using duplex, i.e., antivacuum Medium frequency induction melting adds Ar-O_2 furnace (AOD) converting process, in control
While nitrogen processed, the chemical composition of alloy is set to have obtained fine uniformity and uniformity.
Chromium-manganese-nitrogen stainless steel foundry alloy without nickel disclosed by the invention, with mechanical performance higher, particularly adds
Niobium and vanadium make austenitic stainless steel foundry alloy that the cooperation of casting crystal grain thinning is reached while improving intensity, embody intensity with modeling
Property it is perfect consistent, be particularly well-suited to cast master alloy and use.
Specific embodiment
Embodiment 1
A kind of chromium-manganese-nitrogen austenitic stainless steel, it is characterised in that its chemical composition includes by weight：
A kind of method for preparing above-mentioned chromium-manganese-nitrogen austenitic stainless steel, it is characterised in that comprise the following steps：
(1) melting is carried out in the raw material antivacuum intermediate frequency furnace of input that above-mentioned stainless steel will be prepared, smelting time is
140min, temperature is 1500 DEG C, and normal pressure obtains molten steel；
(2) blowing is, it is necessary to control chromium, manganese, nitrogen in the molten steel obtained by step (1) melting being transferred into Ar-O_2 furnace (AOD)
Content, blow 20min, and nitrogen accounts for the 0.42% of quality of molten steel；
(3) will be transferred in tundish by the molten steel after step (2) blowing, by horizontal casting method, molten steel is pulled into directly
Footpath is the foundry alloy pole of 100mm；
(4) the foundry alloy pole obtained by step (3) continuous casting is transferred in intermediate frequency furnace, is heated to 1030 ± 10
DEG C, after chilling solid solution, hot investment casting is into various sprays.
Embodiment 2
A kind of chromium-manganese-nitrogen austenitic stainless steel, it is characterised in that its chemical composition includes by weight：
A kind of method for preparing above-mentioned chromium-manganese-nitrogen austenitic stainless steel, it is characterised in that comprise the following steps：
(1) melting is carried out in the raw material antivacuum intermediate frequency furnace of input that above-mentioned stainless steel will be prepared, smelting time is
140min, temperature is 1580 DEG C, and normal pressure obtains molten steel；
(2) blowing is, it is necessary to control chromium, manganese, nitrogen in the molten steel obtained by step (1) melting being transferred into Ar-O_2 furnace (AOD)
Content, blow 20min, and nitrogen accounts for the 0.51% of quality of molten steel；
(3) will be transferred in tundish by the molten steel after step (2) blowing, by horizontal casting method, molten steel is pulled into directly
Footpath is the foundry alloy pole of 100mm；
(4) the foundry alloy pole obtained by step (3) continuous casting is transferred in intermediate frequency furnace, is heated to 1030 ± 10
DEG C, after chilling solid solution, hot investment casting is into various sprays.
Embodiment 3
A kind of chromium-manganese-nitrogen austenitic stainless steel, it is characterised in that its chemical composition includes by weight：
A kind of method for preparing above-mentioned chromium-manganese-nitrogen austenitic stainless steel, it is characterised in that comprise the following steps：
(1) melting is carried out in the raw material antivacuum intermediate frequency furnace of input that above-mentioned stainless steel will be prepared, smelting time is
140min, temperature is 1580 DEG C, and normal pressure obtains molten steel；
(2) blowing is, it is necessary to control chromium, manganese, nitrogen in the molten steel obtained by step (1) melting being transferred into Ar-O_2 furnace (AOD)
Content, blow 20min, and nitrogen accounts for the 0.51% of quality of molten steel；
(3) will be transferred in tundish by the molten steel after step (2) blowing, by horizontal casting method, molten steel is pulled into directly
Footpath is the foundry alloy pole of 100mm；
(4) the foundry alloy pole obtained by step (3) continuous casting is transferred in intermediate frequency furnace, is heated to 1030 ± 10
DEG C, after chilling solid solution, hot investment casting is into various sprays.
Embodiment 4
A kind of chromium-manganese-nitrogen austenitic stainless steel, it is characterised in that its chemical composition includes by weight：
A kind of method for preparing above-mentioned chromium-manganese-nitrogen austenitic stainless steel, it is characterised in that comprise the following steps：
(1) melting is carried out in the raw material antivacuum intermediate frequency furnace of input that above-mentioned stainless steel will be prepared, smelting time is
140min, temperature is 1500 DEG C, and normal pressure obtains molten steel；
(2) blowing is, it is necessary to control chromium, manganese, nitrogen in the molten steel obtained by step (1) melting being transferred into Ar-O_2 furnace (AOD)
Content, blow 20min, and nitrogen accounts for the 0.69% of quality of molten steel；
(3) will be transferred in tundish by the molten steel after step (2) blowing, by horizontal casting method, molten steel is pulled into directly
Footpath is the foundry alloy pole of 100mm；
(4) the foundry alloy pole obtained by step (3) continuous casting is transferred in intermediate frequency furnace, is heated to 1030 ± 10
DEG C, after chilling solid solution, hot investment casting is into various sprays.
The stainless steel and existing product 0Cr18Mn13Ni3N of embodiment 1-4, comprising chemical composition it is as shown in table 1.
Embodiment 5
Stainless steel obtained in embodiment 1-4 carries out performance test, test result such as table with existing product 0Cr18Mn13Ni3N
Shown in 2.
The chemical composition that the embodiment 1-4 of table 1 and existing product 0Cr18Mn13Ni3N are included
Note：The mass ratio of S and P in embodiment 1-4 and commercially available prod 0Cr18Mn13Ni3N is excluded in table 1, is also excluded
The mass ratio of Ni in the 0Cr18Mn13Ni3N of commercially available prod.
Stainless steel obtained in the embodiment 1-4 of table 2 and existing product 0Cr18Mn13Ni3N the performance test results
Claims (5)
1. a kind of method for preparing chromium-manganese-nitrogen austenitic stainless steel, it is characterised in that comprise the following steps：
(1) melting is carried out in the raw material of stainless steel being put into antivacuum intermediate frequency furnace, under normal pressure, smelting time is 135-
140min, temperature is 1480-1580 DEG C, obtains molten steel；
(2) molten steel obtained by step (1) melting is transferred in Ar-O_2 furnace (AOD) and is blown, duration of blast is 15-20min；
(3) will be transferred in tundish by the molten steel after step (2) blowing, by horizontal casting method, molten steel is pulled into a diameter of
The foundry alloy pole of 100mm；
(4) the foundry alloy pole obtained by step (3) continuous casting is transferred to melting again in intermediate frequency furnace, it is heated to 1030 ±
10 DEG C, chilling solution treatment, hot investment casting is into various sprays；The wherein raw material of stainless steel, by weight its chemistry into
Dividing includes：
Balance of Fe and inevitable impurity.
2. the method for preparing chromium-manganese-nitrogen austenitic stainless steel according to claim 1, it is characterised in that described can not
Avoiding impurity includes phosphorus (P) and sulphur (S), based on stainless steel gross mass, wherein P≤0.035%, S≤0.030%.
3. the method for preparing chromium-manganese-nitrogen austenitic stainless steel according to claim 1, it is characterised in that described is stainless
Steel is also comprising the vanadium (V) for accounting for stainless steel gross mass 0.5-1.5%.
4. the method for preparing chromium-manganese-nitrogen austenitic stainless steel according to claim 1 or 3, it is characterised in that described
Stainless steel is also comprising the niobium (Nb) for accounting for stainless steel gross mass 1.0-2.5%.
5. the method for preparing chromium-manganese-nitrogen austenitic stainless steel according to claim 1, it is characterised in that step (2) steel
, it is necessary to control the content of chromium, manganese, nitrogen in liquid converting process.
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| CN111519006B (en) * | 2020-04-24 | 2021-04-20 | 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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| CN101353768B (en) * | 2008-09-26 | 2010-09-01 | 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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