CN101285148A - Method for preparing high nitrogen and nickel-less austenitic stainless steel - Google Patents

Method for preparing high nitrogen and nickel-less austenitic stainless steel Download PDF

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CN101285148A
CN101285148A CN 200810050792 CN200810050792A CN101285148A CN 101285148 A CN101285148 A CN 101285148A CN 200810050792 CN200810050792 CN 200810050792 CN 200810050792 A CN200810050792 A CN 200810050792A CN 101285148 A CN101285148 A CN 101285148A
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high nitrogen
steel
nitrogen alloy
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alloy
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CN100532609C (en
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季长涛
刘云旭
王淮
吴化
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Shanghai Li Chen enterprise management center (limited partnership)
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Changchun University of Technology
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Abstract

The invention provides a method for smelting and manufacturing a high-nitrogen nickel-free austenitic stainless steel under normal pressure. The method comprises the following: a step of rapidly adding high-nitrogen alloy before or when the refined Cr-Mn base steel to be poured is poured; a step of stirring the mixture rapidly; a step of quickly casting the steel liquid which is not or little dissolved in the high-nitrogen alloy to make blank material; a step of dealing with the blank material through thermal deformation process and solution treatment to obtain the single phase austenitic stainless steel with 0.6-1.2 weight percent of nitrogen. The method can be carried out under the normal pressure without being smelted at high pressure. Moreover, the method has the advantages of low cost, high efficiency, simple process and accurate control of N, can produce various profiles and is suitable for the mass production.

Description

A kind of manufacture method of high nitrogen and nickel-less austenitic stainless steel
Technical field
The present invention relates to a kind of stainless smelting manufacture method, particularly relate to a kind of method of making high nitrogen and nickel-less austenitic stainless steel of smelting.
Background technology
Along with Cr (chromium)-Ni (nickel) austenitic stainless steel demand increases sharply, it is poor that the Ni resource becomes, and its price also continues soaring, makes the Ni element account for 60~80% of such steel cost.Therefore, the austenitic stainless steel of manufacturing with other element substitution Ni puted forth effort to research and develop in countries in the world.Wherein, useful and cheap element N (nitrogen) is made high N as replacement Ni and do not have the focus that the Ni austenitic stainless steel becomes research.
At present the difficult point of making high nitrogen and nickel-less austenitic stainless steel for Ni with N be N under normal pressure in molten steel solubleness extremely low (N content (wt%)<0.0045), extremely difficulty retains in high-temperature molten steel in a large number, and N 〉=0.6 when adding a certain amount of Mn (manganese) in the N content (wt%) 〉=1.2 of solid solution in the steel or the steel could all replace Ni.If under normal pressure, in molten steel, add N alloy or Nization thing, can make it be decomposed into N2 gas rapidly, overflow on the molten steel surface, " eruption " phenomenon takes place.For improving the N content in the molten steel, countries such as Germany, Austria, Bulgaria realize that operating pressure prepares high-nitrogen austenitic stainless steel at the pressurization electroslag furnace equipment of 4~20MPa, can make N add-on maximum reach 2.1 (wt%).But this steelmaking process (from smelting to casting process) need continue to finish under high-pressure state, makes this smelting technology be restricted greatly because of technology and equipment complexity, production cost height and potential safety hazard.Smelt operating pressure if reduce, the nitrogen content in the then high nitrogen steel is difficult to improve, and generally can only obtain the non-Ovshinsky height nitrogen steel of N content (wt%)<0.4.And propose in the patent application (02132853.6), can adopt vacuum induction furnace smelting and in control N atmosphere substep add the alloy cpd of nitrogen in batches and take off assorted raw material, though this alloy smelting method can be removed impurity, but disagree with the reality of smelting high nitrogen stainless steel, because nitride under normal pressure or negative pressure or vacuum state or nitrogen alloy dissolve back N and can rapid " eruption " overflow in molten steel, be difficult to obtain height and contain the N dimension, only under high-pressure state, just might suppress overflowing of N.This point can obtain explanation in another disclosed patent application (200410022051.0), promptly use rough vacuum (negative pressure) to smelt and can only obtain the high nitrogen steel of N content at 0.0085 (wt%), with high nitrogen height (in) manganese austenitic stainless steel needs the N content of 〉=0.6 (wt%) to differ greatly.Point out in addition, said carbon (C), chromium (Cr), manganese (Mn), molybdenum (Mo), copper (Cu) etc. should content and solution treatment in austenitic stainless steel be all steel alloy principle general knowledge in the patent application (02132853.6), and identical or close with the alloying constituent and the post-processed method of external smelting high-nitrogen austenitic stainless steel, therefore be difficult to supported in the claims.
Although need smelting high-nitrogen nickel-less austenitic stainless steel under high pressure at present, be difficult to realize and under normal pressure, smelt, the present invention proposes a kind of method of making high nitrogen and nickel-less austenitic stainless steel under the normal pressure that can be implemented in.
Summary of the invention
The objective of the invention is to provide the method for smelting and make high nitrogen and nickel-less austenitic stainless steel under a kind of normal pressure (0.1MPa).This method can make things convenient for, stably obtain the controlled high quality high nitrogen and nickel-less austenitic stainless steel of N content.
In normal pressure (0.1Mpa) liquid steel, be easy to overflow but the principle that is difficult to from the crystal form steel, run out of according to N, crucial thinking of the present invention is to have changed conventional alloying dissolving to smelt the method that adds N, and adopt after smelting non-nitrogen base alloy steel, Xiang Gangzhong adds high nitrogen alloy (nitride or nitrogen alloy) with the non-dissolving method that adds " alterant ", and pour into a mould during not dissolved or micro dissolution at high nitrogen alloy, high nitrogen alloy is mixed remain in the base alloy steel that solidifies.Then by the thermal distortion processing and the solution treatment of this steel, make the high nitrogen alloy decomposition that is blended in the steel, diffusion, solid solution in austenite, thereby made high nitrogen and nickel-less austenitic stainless steel.This concrete grammar of making high nitrogen and nickel-less austenitic stainless steel under normal pressure is:
Little carbon Cr-Mn basis molten steel that refining is to be cast adds high nitrogen alloy fast before cast or in the cast, and carry out short mix and stir, fast will thisly contain molten steel not molten or the slightly soluble high nitrogen alloy again and be cast into steel, again by thermal distortion processing and solution treatment the decomposition of the high nitrogen alloy in the steel, solid solution in austenite.
Above-mentioned said little carbon Cr-Mn basis molten steel is C≤0.1 (wt%), P and S≤0.01 (wt%), is the ferrous alloy of main alloying constituent with Cr, Mn.In the molten steel of little carbon Cr-Mn basis, also can add beneficial elements such as Cu, Mo, Al, Ti, V on a small quantity.
Above-mentioned said usefulness contains the steel that molten steel not molten or the slightly soluble high nitrogen alloy is cast into and is meant steel ingot or continuous casting steel billet or tangible steel part.
Above-mentioned said little carbon Cr-Mn basis molten steel adds high nitrogen alloy fast in cast method is applicable to the manufacturing of pouring into a mould the solid shape steel part to mold; Also be applicable to manufacturing to crystallizer cast continuous casting steel billet.That is: the method for above-mentioned said little carbon Cr-Mn basis molten steel adding high nitrogen alloy in cast can be that molten steel is added high nitrogen alloy when mold is poured into a mould; Also can be that molten steel is also evenly added high nitrogen alloy when continuous cast mold pours into continuously continuously.
Above-mentioned said high nitrogen alloy is meant nitride or nitrogen-containing alloy or both mixtures.
Above-mentioned said high nitrogen alloy be shaped as granular or strip or sheet or above-mentioned mixing shape.If add high nitrogen alloy before cast, then the granularity of high nitrogen alloy can be chosen between 2~50 orders by high nitrogen alloy composition difference; If add high nitrogen alloy in cast, then the granularity of high nitrogen alloy can be chosen between 30~300 orders by high nitrogen alloy composition difference.
Above-mentioned said high nitrogen alloy can be the high nitrogen alloy of the surface exposure of common prilling process acquisition, also can be the high nitrogen alloy that there is coating material on the surface.The surface coated purpose of high nitrogen alloy is in order to stop or to slow down the dissolving of high nitrogen alloy in molten steel, prolonging mixing time.
Above-mentioned said coating material is pure metal or alloy or metallic compound.As Fe (iron), Cr (chromium), Mn (manganese), TiN (titanium nitride) etc.Above-mentioned said coating material can adopt the method for plating or electroless plating or vapour deposition to obtain.
It can be by the mobile stirring of molten steel cast or induction stirring or Argon stirring that above-mentioned said short mix stirs.
Adding high nitrogen alloy before the above-mentioned said cast and carrying out the churning time that short mix stirs is 5~100s.
The temperature of above-mentioned said solution treatment is 950~1150 ℃, and soaking time is 6~15h.The reason that soaking time is long is high nitrogen alloy dissolving or just be slightly soluble in the steel behind the steel casting solidification, the solution treatment that will make therefore that high nitrogen alloy fully decomposes, diffusion, solid solution then needs the long period in austenite.The temperature of solution treatment and soaking time also should be determined according to adding high nitrogen alloy composition and granularity.
The invention has the advantages that: provide under a kind of normal pressure and to have smelted and make the high nitrogen and nickel-less austenitic stainless steel method, that smelting equipment requires is simple, production cost is low, efficient is high, technology is simple, control N accurately, be convenient to extensive actual production.Can obtain the austenitic stainless steel that 0.6~1.2 (wt%) height contains the N amount.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the undissolved metallographic structure figure of high nitrogen alloy in the high nitrogen and nickel-less austenitic stainless steel of the present invention.
Fig. 2 is the metallographic structure figure after the high nitrogen alloy dissolving in the high nitrogen and nickel-less austenitic stainless steel of the present invention.
Fig. 3 is high nitrogen and nickel-less austenitic stainless steel transmission electron microscope of the present invention (TEM) structure observation figure.
Fig. 4 is high nitrogen and nickel-less austenitic stainless steel TEM electron diffraction ring figure of the present invention.
Embodiment
Embodiment 1:
Carry out converter refining after earlier just refining the Cr-Mn basis steel of 100kg with induction furnace, adjusting chemical ingredients is (wt%): C 0.03; Cr 9; Mn 14; Si 0.58; Mo 1.5; P≤0.02; S≤0.02; Yu Weitie.
With the 12kg granularity is that high nitrogen ferrochrome alloy and the 3kg granularity that 20 purposes contain 63%Cr, 8%N is that 80 purpose chromium nitrides are mixed and made into the high nitrogen alloy powder.
Cr-Mn basis molten steel and the high nitrogen alloy for preparing are mixed solid material pour into the square crystallizer of 20 * 80mm together, carry out induction stirring simultaneously, rapid solidification is a steel billet.Metallographic examination can see that strip and globular do not dissolve nitride and high temperature ferrite as shown in Figure 1.
Steel billet is heated to 1200 ℃ is rolled into and carries out solutionizing behind the sheet material and handle, the solutionizing temperature is 1000 ℃.Its metallographic examination as shown in Figure 2, high nitrogen alloy is dissolved fully.Analyze through transmission electron microscope (TEM) structure observation (as shown in Figure 3) and electron diffraction ring (as shown in Figure 4) again, prove single-phase austenite structure.Performance analysis shows: its erosion resistance is significantly better than the 1Cr18Ni9Ti austenitic stainless steel; Yield strength σ 0.2〉=550Mpa, tensile strength reaches σ b〉=890Mpa, unit elongation δ 〉=40%.Composition check (wt%): C0.05; Cr 18; Mn 12; Si 0.46; N 0.78; Mo1.2; P≤0.02; S≤0.02; Yu Weitie.
Embodiment 2:
Refining 100kgCr-Mn basis steel, adjusting chemical ingredients is (wt%): C 0.03; Cr12; Mn18; Si 0.58; Mo 1.5; P≤0.02; S≤0.02; Yu Weitie.Control molten steel temperature: 1650 ℃.
The high nitrogen ferrochrome alloy powder of adding surface plating Cr in molten steel (50 orders, 63%Cr, 8%N) 15kg, and behind the induction stirring 30s, pour into the high ingot mould of cooling power fast, and be rapidly solidificated into steel ingot, carry out hot rolling and solution treatment more as described above.Composition check (wt%): C0.045; Cr 21; Mn 15; Si 0.42; N 0.93; Mo1.2; P≤0.02; S≤0.02; Yu Weitie.Microstructure is the single-phase austenite of face-centered cubic lattice.

Claims (6)

1, a kind of method of under normal pressure, making high nitrogen and nickel-less austenitic stainless steel, it is characterized in that little carbon Cr-Mn basis molten steel that refining is to be cast adds high nitrogen alloy fast before cast or in the cast, and carry out short mix and stir, fast will thisly contain molten steel not molten or the slightly soluble high nitrogen alloy again and be cast into steel, again by thermal distortion processing and solution treatment the decomposition of the high nitrogen alloy in the steel, solid solution in austenite.
2, the method for claim 1, the method that it is characterized in that said little carbon Cr-Mn basis molten steel adding high nitrogen alloy in cast is that molten steel is added high nitrogen alloy when mold is poured into a mould, or molten steel is also evenly added high nitrogen alloy when continuous cast mold pours into continuously continuously.
3,, it is characterized in that said high nitrogen alloy is the high nitrogen alloy of the surface exposure of common prilling process acquisition, or the surface there is the high nitrogen alloy of coating material as claim 1,2 described methods.
4, method as claimed in claim 3 is characterized in that said coating material is pure metal or alloy or metallic compound.
5, the method for stating as claim 1 is characterized in that it is by the mobile stirring of molten steel cast or induction stirring or Argon stirring that said short mix stirs.
6, as claim 1,5 described methods, it is characterized in that adding high nitrogen alloy before the said cast and carrying out the churning time that short mix stirs is 5~100s.
CN 200810050792 2008-06-04 2008-06-04 Method for preparing high nitrogen and nickel-less austenitic stainless steel Expired - Fee Related CN100532609C (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104862577A (en) * 2014-10-14 2015-08-26 长春工业大学 Method for manufacturing high-nitrogen steel by utilization of carbon-containing ferrochrome
CN105108098A (en) * 2015-09-30 2015-12-02 吉林常春高氮合金研发中心有限公司 Technology for centrifugal casting of high-nitrogen austenitic stainless steel pipe at normal pressure
CN105296869A (en) * 2012-04-23 2016-02-03 钢铁研究总院 Stainless steel material and manufacturing methods thereof
CN105562644A (en) * 2015-12-18 2016-05-11 吉林常春高氮合金研发中心有限公司 Method for manufacturing propeller casting for high nitrogen austenite stainless steel vessel
CN104862578B (en) * 2014-10-23 2016-08-24 长春工业大学 A kind of chromogen breeze manufactures the method for high nitrogen steel
CN106480279A (en) * 2016-12-28 2017-03-08 长春实越节能材料有限公司 A kind of high nitrogen steel stone oil drill collar surface corrosion-resistant that improves loses anti abrasive method
WO2018103087A1 (en) * 2016-12-09 2018-06-14 孙瑞涛 Method for manufacturing high-nitrogen austenitic stainless steel propeller casting for ship
CN112063912A (en) * 2020-09-22 2020-12-11 攀钢集团攀枝花钢铁研究院有限公司 Nitrogen alloying method of martensitic stainless steel for plastic mould
CN113046534A (en) * 2021-03-15 2021-06-29 长春工业大学 Preparation method of high-nitrogen nickel-free austenitic stainless steel with high twin crystal density

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106513619B (en) * 2016-12-02 2018-05-08 机械科学研究总院青岛分院有限公司 The technique of centrifugal casting high-nitrogen austenitic stainless steel steel pipe under a kind of normal pressure

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105296869A (en) * 2012-04-23 2016-02-03 钢铁研究总院 Stainless steel material and manufacturing methods thereof
CN104862577A (en) * 2014-10-14 2015-08-26 长春工业大学 Method for manufacturing high-nitrogen steel by utilization of carbon-containing ferrochrome
CN104862578B (en) * 2014-10-23 2016-08-24 长春工业大学 A kind of chromogen breeze manufactures the method for high nitrogen steel
CN105108098A (en) * 2015-09-30 2015-12-02 吉林常春高氮合金研发中心有限公司 Technology for centrifugal casting of high-nitrogen austenitic stainless steel pipe at normal pressure
CN105562644A (en) * 2015-12-18 2016-05-11 吉林常春高氮合金研发中心有限公司 Method for manufacturing propeller casting for high nitrogen austenite stainless steel vessel
WO2018103087A1 (en) * 2016-12-09 2018-06-14 孙瑞涛 Method for manufacturing high-nitrogen austenitic stainless steel propeller casting for ship
CN106480279A (en) * 2016-12-28 2017-03-08 长春实越节能材料有限公司 A kind of high nitrogen steel stone oil drill collar surface corrosion-resistant that improves loses anti abrasive method
CN112063912A (en) * 2020-09-22 2020-12-11 攀钢集团攀枝花钢铁研究院有限公司 Nitrogen alloying method of martensitic stainless steel for plastic mould
CN113046534A (en) * 2021-03-15 2021-06-29 长春工业大学 Preparation method of high-nitrogen nickel-free austenitic stainless steel with high twin crystal density

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