CN103045953A - 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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- CN103045953A CN103045953A CN2013100017489A CN201310001748A CN103045953A CN 103045953 A CN103045953 A CN 103045953A CN 2013100017489 A CN2013100017489 A CN 2013100017489A CN 201310001748 A CN201310001748 A CN 201310001748A CN 103045953 A CN103045953 A CN 103045953A
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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, the stainless steel field is specifically related to a kind of resistant to heat aging duplex stainless steel.
Background technology
Duplex stainless steel is the stainless steel that contains ferrite and austenite duplex structure, and it combines the advantage of austenite and ferritic stainless steel well.Compare with austenitic stainless steel, two-phase stainless hardness of steel height and intergranular corrosion resistance and the corrosion of anti-chloride stress cracking are significantly improved, and have simultaneously good anti-pitting performance, also are a kind of joint nickel and stainless steels.Compare 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 ℃ of fragility and the thermal conductivity that also maintain simultaneously ferritic stainless steel are high, have the characteristics such as superplasticity.Because the good over-all properties of duplex stainless steel can satisfy the service requirements of bad working environments, thereby be widely used in the industry such as nuclear power, ocean, petrochemical industry, boats and ships and military affairs.
Thermal ageing embrittlement phenomenon can occur owing to contain a certain amount of ferrite at 300 ~ 500 ℃ of temperature range life-time service in duplex stainless steel, and showing as ferritic hardness increases, and the fracture toughness property of material reduces.Primary loop piping in the pressurized-water reactor nuclear power plant, Main Coolant pump case and a large amount of valves are all selected duplex stainless steel, after long-time running, cause the mechanical property serious degradation owing to thermal ageing, thereby reduced reliability and the security of these key parts, finally affected the safe operation of Nuclear power plants.Be generally 40-60 the life of Nuclear power plants, and the usage period that belongs to non-exchange key part also must be higher than the lifetime of Nuclear power plants, and the two-phase stainless steel of therefore selecting must have the long service security.
The duplex stainless steel that generally uses at present, its ferrite content generally is higher than 15%, and the large and mutually perforation of ferrite size has excellent over-all properties before such being organized in do not used.But behind the long term heat ageing, size ferrite large and that mutually connect can form the rapid passage of embrittlement in material, and this can cause the rapid deterioration of duplex stainless steel material mechanical performance.Therefore, a kind of ferrite content of very necessary exploitation is lower, and the ferrite form is tiny and disconnected resistant to heat aging duplex stainless steel evenly.
Summary of the invention
The objective 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, the ferrite form is evenly tiny and be not communicated with, can significantly weaken the performance degradation of material behind the long term heat ageing, thereby prolong its work-ing life.
Resistant to heat aging duplex stainless steel provided by the invention contains following 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 by weight percentage, 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 are Fe and inevitable impurity.Ferrite content scope 5-15%, ferrite are evenly tiny and be not communicated with.
The preparation method is as follows:
According to resistant to heat aging duplex stainless steel component content batching, adopt electric arc furnace+argon oxygen decarburizing furnace furnace outer refining process to smelt, by rotary casting or static casting cast molding.In 1050-1150 ℃ of temperature range, carry out solution treatment.A kind of preparation method of 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 ℃;
3. type tube or mold are preheating to 200-250 ℃, by rotary casting or static casting cast molding;
4. teeming temperature 1500-1600 ℃, the centrifugal casting moulded barrel rotating speed is 400-500r/min;
5. 300-350 ℃ of bottom knockout;
6. product is through 1050-1150 ℃ of solution treatment, and the time is to be no less than 10h;
7. adopt Water Quenching after the solution treatment, the time is 15-30min, and water temperature is lower than 40 ℃.
Further, the two-link smelting process of described electric arc furnace+argon oxygen decarburizing furnace comprises the steps:
1) raw material is placed in the electric smelting furnace, tap to tap time, 60-70min guaranteed that tapping temperature is higher than 1600 ℃;
2) molten steel is transferred to argon oxygen decarburizing furnace and carries out external refining, temperature range: 1580 ~ 1730 ℃, refining time is controlled 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 is compared with traditional duplex stainless steel and is had more even tiny tissue, ferrite is circle obtuse and does not mutually connect, and ferrite content is relatively lower, guaranteed that product has good mechanical property, the thermal ageing degeneration of material significantly weakens behind the long term heat ageing simultaneously.
2. the adding of Mo element has guaranteed the pitting corrosion resistant performance of material, and lower Mo content can not make the heat aging performance degeneration aggravation of material simultaneously.
3. the Si element can the refinement ferrite crystal grain, improves the mechanical property of material, and Si content is controlled in the specified range, has avoided that the thermal ageing trend that causes strengthens because ferrite content raises.
Embodiment
Embodiment 1:
The resistant to heat aging two-phase stainless steel chemical composition that 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, surplus is Fe and inevitable impurity.At first, raw material is placed fusing in the electric smelting furnace, smelts, tap to tap time, 60min guaranteed that tapping temperature is higher than 1600 ℃; Molten steel is transferred to argon oxygen decarburizing furnace again and carries out external refining, temperature range: 1600 ℃, refining time is controlled at 90min, 1630 ℃ of tapping temperatures; Type tube is preheating to 220 ℃, by the rotary casting moulding, 1550 ℃ of teeming temperatures, the type tube rotating speed is 450r/min; 325 ℃ of bottom knockouts; Through 1100 ℃ of solution treatment, the time is to be 10h.Adopt Water Quenching after the solution treatment, the time is 20min, 30 ℃ of water temperatures.
After measured, the ferrite content of embodiment 1 is 8.0%.Cut the standard impact specimen of 55 * 10 * 10mm from foundry goods, with common duplex stainless steel material in contrast.Below be the impact property of the resistant to heat aging duplex stainless steel of this routine manufacturing and control material with the contrast table of thermal aging time downtrending:
| 400 ℃ of thermal ageings | 0h | 100h | 1000h | 3000h |
| The inventive example (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 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, surplus is Fe and inevitable impurity.At first, raw material is placed fusing in the electric smelting furnace, smelts, tap to tap time, 65min guaranteed that tapping temperature is higher than 1600 ℃; Molten steel is transferred to argon oxygen decarburizing furnace again and carries out external refining, temperature range: 1650 ℃, refining time is controlled at 70min, 1600 ℃ of tapping temperatures; Mold is preheating to 250 ℃, by static casting, 1600 ℃ of teeming temperatures; 300 ℃ of bottom knockouts; Through 1080 ℃ of solution treatment, the time is to be 12h.Adopt Water Quenching after the solution treatment, the time is 30min, 25 ℃ of water temperatures.
After measured, the ferrite content of embodiment 2 is 9.8%.Cut the standard impact specimen of 55 * 10 * 10mm from foundry goods, with common duplex stainless steel material in contrast.Below be the impact property of the resistant to heat aging duplex stainless steel of this routine manufacturing and control material with the contrast table of thermal aging time downtrending:
| 400 ℃ of thermal ageings | 0h | 100h | 1000h | 3000h |
| The inventive example (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 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, surplus is Fe and inevitable impurity.At first, raw material is placed fusing in the electric smelting furnace, smelts, tap to tap time, 69min guaranteed that tapping temperature is higher than 1600 ℃; Molten steel is transferred to argon oxygen decarburizing furnace again and carries out external refining, temperature range: 1730 ℃, refining time is controlled at 65min, 1650 ℃ of tapping temperatures; Mold is preheating to 200 ℃, by static casting, 1500 ℃ of teeming temperatures; 350 ℃ of bottom knockouts; Through 1050 ℃ of solution treatment, the time is to be 10h.Adopt Water Quenching after the solution treatment, the time is 15min, 35 ℃ of water temperatures.
After measured, the ferrite content of embodiment 3 is 11.2%.Cut the standard impact specimen of 55 * 10 * 10mm from foundry goods, with common duplex stainless steel material in contrast.Below be the impact property of the resistant to heat aging duplex stainless steel of this routine manufacturing and control material with the contrast table of thermal aging time downtrending:
| 400 ℃ of thermal ageings | 0h | 100h | 1000h | 3000h |
| The inventive example (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 (4)
1. resistant to heat aging duplex stainless steel, it is characterized in that, contain by weight percentage following 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, surplus is Fe; Contained ferritic content＜20%, ferrite are evenly tiny and be not communicated with.
2. resistant to heat aging duplex stainless steel according to claim 1, it is characterized in that, the weight percent content of described each composition 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 are Fe; Described ferritic content is 5-15%, and ferrite is evenly tiny and be not communicated with.
3. a method for preparing the described resistant to heat aging duplex stainless steel of claim 1 is characterized in that, comprises the steps:
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) two-link smelting process of employing electric arc furnace+argon oxygen decarburizing furnace, tapping temperature 1600-1650 ℃;
3) type tube or mold are preheating to 200-250 ℃, by rotary casting or static casting cast molding;
4) teeming temperature 1500-1600 ℃, the centrifugal casting moulded barrel rotating speed is 400-500r/min;
5) 300-350 ℃ of bottom knockout;
6) product is through 1050-1150 ℃ of solution treatment, and the time is to be no less than 10h;
7) adopt Water Quenching after the solution treatment, the time is 15-30min, and water temperature is lower than 40 ℃.
4. the method for resistant to heat aging duplex stainless steel according to claim 3 is characterized in that, the two-link smelting process of described electric arc furnace+argon oxygen decarburizing furnace comprises the steps:
(1) raw material is placed in the electric smelting furnace, tap to tap time, 60-70min guaranteed that tapping temperature is higher than 1600 ℃;
(2) molten steel is transferred to argon oxygen decarburizing furnace and carries out external refining, temperature range: 1580 ~ 1730 ℃, refining time is controlled at 60 ~ 100min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107779787A (en) * | 2016-08-30 | 2018-03-09 | 浙江大隆合金钢有限公司 | Z2CN19 10NS Nuclear pipings austenitic stainless steels 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02101148A (en) * | 1988-10-07 | 1990-04-12 | Hitachi Ltd | Equipment member excellent in nitric acid resistance |
| 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 |
-
2013
- 2013-01-05 CN CN201310001748.9A patent/CN103045953B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02101148A (en) * | 1988-10-07 | 1990-04-12 | Hitachi Ltd | Equipment member excellent in nitric acid resistance |
| 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 |
|---|
| 何琨 等: "核电用主管道不锈钢的动水腐蚀性能研究", 《核动力工程》 * |
| 张琳琳: "铸造奥氏体不锈钢长时热老化后的组织和性能研究", 《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》 * |
| 曾正涛 等: "压水堆核电站不锈钢主管道铸造", 《核动力工程》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107779787A (en) * | 2016-08-30 | 2018-03-09 | 浙江大隆合金钢有限公司 | Z2CN19 10NS Nuclear pipings austenitic stainless steels 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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