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 PDFInfo
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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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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 55
- 239000010959 steel Substances 0.000 claims abstract description 55
- 229910001199 N alloy Inorganic materials 0.000 claims abstract description 49
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- 229910001566 austenite Inorganic materials 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 239000006104 solid solution Substances 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 229910000765 intermetallic Inorganic materials 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000005266 casting Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 2
- 239000011572 manganese Substances 0.000 description 19
- 239000011651 chromium Substances 0.000 description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 229910052804 chromium Inorganic materials 0.000 description 7
- 229910052748 manganese Inorganic materials 0.000 description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 4
- 241001062472 Stokellia anisodon Species 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- -1 diffusion Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000002003 electron diffraction Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200810050792 CN100532609C (en) | 2008-06-04 | 2008-06-04 | Method for preparing high nitrogen and nickel-less austenitic stainless steel |
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| CN 200810050792 CN100532609C (en) | 2008-06-04 | 2008-06-04 | Method for preparing high nitrogen and nickel-less austenitic stainless steel |
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| CN101285148A true CN101285148A (en) | 2008-10-15 |
| CN100532609C CN100532609C (en) | 2009-08-26 |
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Cited By (9)
| 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 |
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| 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 |
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2008
- 2008-06-04 CN CN 200810050792 patent/CN100532609C/en not_active Expired - Fee Related
Cited By (9)
| 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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| CN100532609C (en) | 2009-08-26 |
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