CN103045953B - Heat-aging-resistant duplex stainless steel and fabrication method thereof - Google Patents
Heat-aging-resistant duplex stainless steel and fabrication method thereof Download PDFInfo
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- CN103045953B CN103045953B CN201310001748.9A CN201310001748A CN103045953B CN 103045953 B CN103045953 B CN 103045953B CN 201310001748 A CN201310001748 A CN 201310001748A CN 103045953 B CN103045953 B CN 103045953B
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Abstract
The invention relates to the field of metallurgy stainless steel, in particular to heat-aging-resistant duplex stainless steel and a fabrication method thereof. The stainless steel comprises the following components by weight percentage: less than 0.03% of C, 18.0-22.0% of Cr, 8.0-11.0% of Ni, 0.5-1.5% of Mn, 0.2-1.0% of Si, 0.1-0.8% of Mo, less than 0.005% of S, less than 0.03% of P, and the balance of Fe and unavoidable impurities, wherein the ferrite content is less than 20%. The fabrication method comprises the steps of blending according to the component content of the heat-aging-resistant duplex stainless steel, making through an electric arc furnace and argon oxygen refining furnace external refining technology, conducting centrifugal casting or static casting for forming, and conducting solution treatment within 1050-1150 DEG C. The stainless steel has uniform, fine and disconnected ferrite; the ferrite content is lower; the stainless steel has excellent mechanical properties; and the degeneration degree of the mechanical properties of the stainless steel after long-term heat aging is very low.
Description
Technical field
The present invention relates to metallurgical class, stainless steel field, be specifically related to a kind of resistant to heat aging duplex stainless steel.
Background technology
Duplex stainless steel is the stainless steel containing ferrite and austenitic duplex tissue, and it combines the advantage of austenite and ferritic stainless steel well.Compared with austenitic stainless steel, two-phase stainless hardness of steel high and intergranular corrosion resistance and resistance to muriate stress corrosion are significantly improved, and have excellent resistance to pitting performance simultaneously, are also a kind of joint nickel and stainless steels.Compared with ferritic stainless steel, duplex stainless steel plasticity, toughness are higher, and without brittleness at room temperature, intergranular corrosion resistance performance and welding property are significantly increased, and the 475 DEG C of fragility and the thermal conductivity that also maintain ferritic stainless steel high simultaneously, has the features such as superplasticity.Due to the over-all properties that duplex stainless steel is good, the service requirements of bad working environments can be met, be thus widely used in the industry such as nuclear power, ocean, petrochemical industry, boats and ships and military affairs.
Due to containing a certain amount of ferrite, can there is the brittle phenomenon of thermal ageing at 300 ~ 500 DEG C of temperature range life-time service, show as the increase of ferritic hardness in duplex stainless steel, the fracture toughness property reduction of material.Primary Ioops main pipeline in pressurized-water reactor nuclear power plant, Main Coolant pump case and a large amount of valves all select duplex stainless steel, because thermal ageing causes mechanical property serious degradation after long-time running, thus reduce reliability and the security of these key parts, finally affect the safe operation of Nuclear power plants.The life of Nuclear power plants is generally 40-60, and the usage period belonging to non-exchange key part also must higher than the lifetime of Nuclear power plants, and the two-phase stainless steel therefore selected must have long service security.
The duplex stainless steel generally used at present, its ferrite content is generally higher than 15%, and ferrite size more greatly and mutually through, has excellent over-all properties before such being organized in does not use.But after long term heat ageing, greatly and mutually through ferrite can form brittle rapid passage in the material, this can cause the sharply deterioration of duplex stainless steel material mechanical performance to size.Therefore, a kind of ferrite content of very necessary exploitation is lower, the evenly tiny and disconnected resistant to heat aging duplex stainless steel of ferrite form.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of resistant to heat aging two-phase stainless steel is provided, this material ferrite content is lower, ferrite form is evenly tiny and be not communicated with, significantly can weaken the performance degradation of material after long term heat ageing, thus extend its work-ing life.
Resistant to heat aging duplex stainless steel provided by the invention is by weight percentage containing, for example lower composition: C < 0.03, Cr 18.0-22.0, Ni 8.0-11.0, Mn 0.5-1.5, Si 0.2-1.0, Mo 0.1-0.8, S < 0.005, P < 0.03, and surplus is Fe and inevitable impurity.Ferrite content requires < 20%, and ferrite is evenly tiny and be not communicated with.
Each composition preferred content (% by weight) is:
C 0.01-0.03, Cr 19.0-21.5, Ni 8.5-10.0, Mn 0.5-1.2, Si 0.2-0.8, Mo 0.1-0.5, S < 0.005, P < 0.03, surplus is Fe and inevitable impurity.Ferrite content scope 5-15%, ferrite is evenly tiny and be not communicated with.
Preparation method is as follows:
According to resistant to heat aging duplex stainless steel component content batching, electric arc furnace+argon oxygen decarburizing furnace furnace outer refining process is adopted to smelt, by rotary casting or static casting cast molding.Solution treatment is carried out in 1050-1150 DEG C of temperature range.A preparation method for resistant to heat aging duplex stainless steel, its step comprises:
1., according to following composition and weight percent content batching: C < 0.03, Cr 18.0-22.0, Ni 8.0-11.0, Mn 0.5-1.5, Si 0.2-1.0, Mo 0.1-0.8, surplus is Fe;
2. adopt the two-link smelting process of electric arc furnace+argon oxygen decarburizing furnace, tapping temperature 1600-1650 DEG C;
3. type tube or mold are preheating to 200-250 DEG C, by rotary casting or static casting cast molding;
4. teeming temperature 1500-1600 DEG C, centrifugal casting moulded barrel rotating speed is 400-500r/min;
5. 300-350 DEG C of bottom knockout;
6. product is through 1050-1150 DEG C of solution treatment, and the time is no less than 10h;
7. adopt Water Quenching after solution treatment, the time is 15-30min, and water temperature is lower than 40 DEG C.
Further, the two-link smelting process of described electric arc furnace+argon oxygen decarburizing furnace comprises the steps:
1) be placed in electric smelting furnace by raw material, tap to tap time, 60-70min, ensured that tapping temperature is higher than 1600 DEG C;
2) molten steel is transferred to argon oxygen decarburizing furnace and carries out external refining, temperature range: 1580 ~ 1730 DEG C, refining time controls at 60 ~ 100min.
Resistant to heat aging duplex stainless steel of the present invention has characteristic and advantage:
1. resistant to heat aging duplex stainless steel of the present invention has evenly tiny tissue compared with traditional duplex stainless steel, ferrite is circle obtuse and mutually not through, and ferrite content is relatively lower, ensure that product has excellent mechanical property, after long term heat ageing, the thermal ageing degeneration of material significantly weakens simultaneously.
2. Mo element add the pitting corrosion resistant performance that ensure that material, simultaneously lower Mo content can not make the heat aging performance of material degenerate aggravation.
3. Si element can fining ferrite grains, improves the mechanical property of material, controls in specified range by Si content, avoids because ferrite content raises the thermal ageing trend increasing caused.
Embodiment
Embodiment 1:
The resistant to heat aging two-phase stainless steel chemical composition that the present embodiment provides is: C 0.028, Cr 20.9, Ni 9.2, Mn 1.0, Si 0.3, Mo 0.2, S 0.004, P 0.028, and surplus is Fe and inevitable impurity.First, raw material is placed in fusing in electric smelting furnace, smelts, tap to tap time, 60min, ensured that tapping temperature is higher than 1600 DEG C; Again molten steel is transferred to argon oxygen decarburizing furnace and carries out external refining, temperature range: 1600 DEG C, refining time controls at 90min, tapping temperature 1630 DEG C; Type tube is preheating to 220 DEG C, shaping by rotary casting, teeming temperature 1550 DEG C, type tube rotating speed is 450r/min; 325 DEG C of bottom knockouts; Through 1100 DEG C of solution treatment, the time is 10h.Adopt Water Quenching after solution treatment, the time is 20min, water temperature 30 DEG C.
After measured, the ferrite content of embodiment 1 is 8.0%.The standard impact specimen of 55 × 10 × 10mm is cut, with common duplex stainless steel material in contrast from foundry goods.Below the contrast table of impact property with thermal aging time downtrending of resistant to heat aging duplex stainless steel manufactured by this example and control material:
| 400 DEG C of thermal ageings | 0h | 100h | 1000h | 3000h |
| Example of the present invention (fall of ballistic work, %) | 0 | 17.9 | 19.5 | 27.6 |
| Reference examples (fall of ballistic work, %) | 0 | 25.7 | 43.9 | 60.2 |
Embodiment 2:
The resistant to heat aging two-phase stainless steel chemical composition that the present embodiment provides is: C 0.025, Cr 21.9, Ni 10.8, Mn 1.2, Si 0.8, Mo 0.1, S 0.004, P 0.028, and surplus is Fe and inevitable impurity.First, raw material is placed in fusing in electric smelting furnace, smelts, tap to tap time, 65min, ensured that tapping temperature is higher than 1600 DEG C; Again molten steel is transferred to argon oxygen decarburizing furnace and carries out external refining, temperature range: 1650 DEG C, refining time controls at 70min, tapping temperature 1600 DEG C; Mold is preheating to 250 DEG C, by static casting, teeming temperature 1600 DEG C; 300 DEG C of bottom knockouts; Through 1080 DEG C of solution treatment, the time is 12h.Adopt Water Quenching after solution treatment, the time is 30min, water temperature 25 DEG C.
After measured, the ferrite content of embodiment 2 is 9.8%.The standard impact specimen of 55 × 10 × 10mm is cut, with common duplex stainless steel material in contrast from foundry goods.Below the contrast table of impact property with thermal aging time downtrending of resistant to heat aging duplex stainless steel manufactured by this example and control material:
| 400 DEG C of thermal ageings | 0h | 100h | 1000h | 3000h |
| Example of the present invention (fall of ballistic work, %) | 0 | 18.5 | 22.3 | 32.5 |
| Reference examples (fall of ballistic work, %) | 0 | 25.7 | 43.9 | 60.2 |
Embodiment 3:
The resistant to heat aging two-phase stainless steel chemical composition that the present embodiment provides is: C 0.028, Cr 18.3, Ni 8.3, Mn 1.0, Si 0.3, Mo 0.5, S 0.004, P 0.028, and surplus is Fe and inevitable impurity.First, raw material is placed in fusing in electric smelting furnace, smelts, tap to tap time, 69min, ensured that tapping temperature is higher than 1600 DEG C; Again molten steel is transferred to argon oxygen decarburizing furnace and carries out external refining, temperature range: 1730 DEG C, refining time controls at 65min, tapping temperature 1650 DEG C; Mold is preheating to 200 DEG C, by static casting, teeming temperature 1500 DEG C; 350 DEG C of bottom knockouts; Through 1050 DEG C of solution treatment, the time is 10h.Adopt Water Quenching after solution treatment, the time is 15min, water temperature 35 DEG C.
After measured, the ferrite content of embodiment 3 is 11.2%.The standard impact specimen of 55 × 10 × 10mm is cut, with common duplex stainless steel material in contrast from foundry goods.Below the contrast table of impact property with thermal aging time downtrending of resistant to heat aging duplex stainless steel manufactured by this example and control material:
| 400 DEG C of thermal ageings | 0h | 100h | 1000h | 3000h |
| Example of the present invention (fall of ballistic work, %) | 0 | 20.9 | 25.3 | 37.4 |
| Reference examples (fall of ballistic work, %) | 0 | 25.7 | 43.9 | 60.2 |
Claims (2)
1. a resistant to heat aging duplex stainless steel, it is characterized in that, by weight percentage containing, for example lower composition: C 0.01-0.03, Cr 19.0-21.5, Ni 8.5-10.0, Mn 0.5-1.2, Si 0.2-0.8, Mo 0.1-0.5, S < 0.005, P < 0.03, surplus is Fe; Wherein ferritic content is 5-15%, and ferrite is evenly tiny to be circle obtuse and not to be communicated with; The method preparing described resistant to heat aging duplex stainless steel comprises the steps:
1) according to described composition and weight percent content batching;
2) two-link smelting process of electric arc furnace+argon oxygen decarburizing furnace is adopted, tapping temperature 1600-1650 DEG C;
3) type tube or mold are preheating to 200-250 DEG C, by rotary casting or static casting cast molding;
4) teeming temperature 1500-1600 DEG C, centrifugal casting moulded barrel rotating speed is 400-500r/min;
5) 300-350 DEG C of bottom knockout;
6) product is through 1050-1150 DEG C of solution treatment, and the time is no less than 10h;
7) adopt Water Quenching after solution treatment, the time is 15-30min, and water temperature is lower than 40 DEG C.
2. the method for resistant to heat aging duplex stainless steel according to claim 1, is characterized in that, the two-link smelting process of described electric arc furnace+argon oxygen decarburizing furnace comprises the steps:
(1) be placed in electric smelting furnace by raw material, tap to tap time, 60-70min, ensured that tapping temperature is higher than 1600 DEG C;
(2) molten steel is transferred to argon oxygen decarburizing furnace and carries out external refining, temperature range: 1580 ~ 1730 DEG C, refining time controls at 60 ~ 100min.
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| CN104451428A (en) * | 2014-12-10 | 2015-03-25 | 上海大学兴化特种不锈钢研究院 | Heat-resistant abrasion-resistant double-phase stainless steel casting alloy material |
| CN107779787B (en) * | 2016-08-30 | 2020-07-14 | 浙江大隆合金钢有限公司 | Austenitic stainless steel for Z2CN19-10NS nuclear power pipeline and steel ingot production method |
| CN110117757A (en) * | 2019-05-22 | 2019-08-13 | 二重（德阳）重型装备有限公司 | ZG06Cr25Ni20 casting material and preparation method thereof |
| CN110819910A (en) * | 2019-12-26 | 2020-02-21 | 福建华扬科技有限公司 | Double-phase stainless steel drum new material for horizontal screw separator and preparation method thereof |
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| CN101560634A (en) * | 2009-03-20 | 2009-10-21 | 永兴特种不锈钢股份有限公司 | Abrasion and corrosion resistant nonmagnetic high-strength stainless steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101560634A (en) * | 2009-03-20 | 2009-10-21 | 永兴特种不锈钢股份有限公司 | Abrasion and corrosion resistant nonmagnetic high-strength stainless steel |
Non-Patent Citations (3)
| Title |
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| 压水堆核电站不锈钢主管道铸造;曾正涛 等;《核动力工程》;19990831;第20卷(第4期);第357-358页 * |
| 核电用主管道不锈钢的动水腐蚀性能研究;何琨 等;《核动力工程》;20121231;第33卷(第增刊2期);第83页 * |
| 铸造奥氏体不锈钢长时热老化后的组织和性能研究;张琳琳;《中国优秀硕士学位论文全文数据库(电子期刊) 工程科技I辑》;20111231;B022-65页：第12-14页 * |
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