CN108611569A - 520B precipitation-hardening stainless steels steel ingot and its production method - Google Patents
520B precipitation-hardening stainless steels steel ingot and its production method Download PDFInfo
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Abstract
The invention discloses 520B precipitation-hardening stainless steels steel ingot and its production method, the chemical composition (wt%) by weight percentage of 520B precipitation-hardening stainless steel steel ingots is：C：0.042~0.060；Mn：≤1.00；Si：≤0.65；S：≤0.005；P：≤0.015；Cr：13.0~14.5；Ni：5.0~6.0；Mo：1.30~1.80；Cu：1.32~2.00；Nb：0.27~0.45, remaining Fe.Production method includes the following steps：Raw material select；Electric arc furnace smelting；VODC vacuum refining furnaces refine；Tapping；Cast；Demoulding；Annealing；Forging；Forging roughing；Property heat treatment；Physical and chemical testing, dimension control finally obtain 520B precipitation-hardening stainless steel steel ingot finished products.The 520B precipitation-hardening stainless steels of the present invention are a kind of martensitic precipitations, have corrosion resistance, high intensity, high rigidity and good welding performance, are suitable for the civil infrastructures fields such as aerospace, medical instrument and machine-building.
Description
Technical field
The invention belongs to steel technical fields, and in particular to 520B precipitation-hardening stainless steels steel ingot and its production method.
Background technology
As aircraft industry continues to develop, higher design requirement is proposed to the key component important parts of aviation flight equipment,
Especially high intensity, the performance of high tenacity, resistance to high fatigue.520B is a kind of martensitic precipitation, is had corrosion-resistant
Property, high intensity, high rigidity and good welding performance, it is great to be widely used in aerospace, medical instrument and machine-building etc.
Engineering structure field.Therefore, many novel precipitation-hardening stainless steels are developed.The type and chemistry of precipitation-hardening stainless steel
Ingredient is divided into：1, martensite type：Martensitic precipitation can be divided into martensitic precipitation hardening type and martensite ag(e)ing again
Constrictive type.But the supply of material state of various martensite type precipitation-hardening stainless steels is martensite, as long as finished product is simply at timeliness
Reason can reach precipitation-hardening effect；2, semiaustenitic type：Semiaustenitic precipitation-hardening stainless steel, supply of material state are austenite.
This kind of steel must pass through special heat treatment before precipitation-hardening processing.
Invention content
In order to meet the needs of aircraft equipment development, the technical solution adopted by the present invention is：520B precipitation-hardening stainless steels
Steel ingot, chemical composition (wt%) by weight percentage are：
C：0.042~0.060；Mn：≤1.00；Si：≤0.65；S：≤0.005；P：≤0.015；Cr：13.0~14.5；
Ni：5.0~6.0；Mo：1.30~1.80；Cu：1.32~2.00；Nb：0.27~0.45, remaining Fe.
The production method of 520B precipitation-hardening stainless steel steel ingots, includes the following steps：
1) raw material select：Select S≤0.030%, the steel scraps of P≤0.030% and Cr, Ni, Mo, Cu, Nb alloy；
2) electric arc furnace smelting：Make C >=0.80%, Si≤0.70%, Mn≤1.0% in melting stage, Cr≤14.0%, Ni≤
6.0%, Mo≤1.80%, Cu≤1.8%, Nb≤0.45%, P≤0.020%；The heat of oxidation make decarburized amount >=0.40%, C >=
0.70%, P≤0.008%, S≤0.006%；Reducing agent is added in reduction period molten steel and forms white slag, bath temperature is kept
1700 DEG C, subsequent molten steel is transferred to tundish, and skims in tundish, and level of residue≤1.5kg/t subsequently enters VODC vacuum fines
Furnace refines；
3) VODC vacuum refining furnaces refine：VOD stages, 80~120mbar of vacuum degree, oxygen flow 550M3/ h, argon flow
5M3/h；VCD stages, vacuum degree≤5mbar, 10~15 minutes pumpdown times, argon flow 5M3/h；The VOH stages, by molten steel weight
Amount often adds 1% aluminium that 250 DEG C of calculating can be improved, and is warming up to 1650~1670 DEG C, 500~600M of oxygen flow3/ h, vacuum degree 350
~450mbar, argon flow 5M3/ h adjusts each ingredient to prescribed requirement；VD stages, vacuum degree≤1.0mbar, pumpdown time
＞ 20 minutes, argon flow 5M3/h；
4) it taps：Molten steel is transferred to ladle at a temperature of 1600 DEG C, and 1.5~2.5kg/t silico-calcium deoxidiers are first added in ladle,
The swash of wave final deoxidizing when molten steel enters ladle；
5) it pours into a mould：Molten steel calmness 7~8 minutes, are used in combination argon for protecting pouring, prevent secondary oxidation before cast；
6) it demoulds：It is cold first to carry out the mould of a period of time, is demoulded after cooling；
7) it anneals：Annealing process is 680 DEG C × 10~15h, is come out of the stove air-cooled；
8) it forges：Initial forging temperature be 1150 DEG C, final forging temperature >=850 DEG C, forging ratio >=2.0, ratio of elongation >=2.0, always than
≥4.0；
9) forging roughing：Roughing is carried out to forging, and is detected using ultrasonic examination；
10) property heat treatment：Solution treatment is carried out successively：1050 DEG C × 1h water coolings or oil cooling；Intermediate adjustment processing：850
DEG C × 1.5h oil cooling or water coolings；Ageing treatment：620 DEG C × 4~6h, water cooling；
11) physical and chemical testing, dimension control are carried out after property heat treatment successively, finally obtains 520B precipitation-hardening stainless steel steel
Ingot finished product.
It is made annealing treatment after the forging as a preferred embodiment of the above solution, annealing process is that 620 DEG C × 10~12h goes out
Stove is air-cooled.
The mould cool time presses formula T (h)=35R as a preferred embodiment of the above solution,2(M) × 1.2, R is mode radius.
The beneficial effects of the invention are as follows：The 520B precipitation-hardening stainless steels of the present invention are a kind of martensitic precipitation hardening stainless
Steel has corrosion resistance, high intensity, high rigidity and good welding performance, is suitable for aerospace, medical instrument and machinery system
Make equal civil infrastructures field.
Specific implementation mode
520B precipitation-hardening stainless steel steel ingots, chemical composition (wt%) by weight percentage are：C：0.042~0.060；
Mn：≤1.00；Si：≤0.65；S：≤0.005；P：≤0.015；Cr：13.0~14.5；Ni：5.0~6.0；Mo：1.30~
1.80；Cu：1.32~2.00；Nb：0.27~0.45, remaining Fe.
The production method of 520B precipitation-hardening stainless steel steel ingots, includes the following steps：
(1) raw material select：Select S≤0.030%, the steel scraps of P≤0.030% and Cr, Ni, Mo, Cu, Nb alloy；
(2) electric arc furnace smelting：Make C >=0.80%, Si≤0.70%, Mn≤1.0%, Cr≤14.0%, Ni in melting stage
≤ 6.0%, Mo≤1.80%, Cu≤1.8%, Nb≤0.45%, P≤0.020%；The heat of oxidation make decarburized amount >=0.40%, C >=
0.70%, P≤0.008%, S≤0.006%；Reducing agent is added in reduction period molten steel and forms white slag, bath temperature is kept
1700 DEG C, subsequent molten steel is transferred to tundish, and skims in tundish, and level of residue≤1.5kg/t subsequently enters VODC vacuum fines
Furnace refines；
(3) VODC vacuum refining furnaces refine：VOD stages, 80~120mbar of vacuum degree, oxygen flow 550M3/ h, argon flow
5M3/h；VCD stages, vacuum degree≤5mbar, 10~15 minutes pumpdown times, argon flow 5M3/h；The VOH stages, by molten steel weight
Amount often adds 1% aluminium that 250 DEG C of calculating can be improved, and is warming up to 1650~1670 DEG C, 500~600M of oxygen flow3/ h, vacuum degree 350
~450mbar, argon flow 5M3/ h adjusts each ingredient to prescribed requirement；VD stages, vacuum degree≤1.0mbar, pumpdown time
＞ 20 minutes, argon flow 5M3/h；
(4) it taps：Molten steel is transferred to ladle at a temperature of 1600 DEG C, and 1.5~2.5kg/t silico-calcium deoxidations are first added in ladle
Agent, the swash of wave final deoxidizing when molten steel enters ladle；
(5) it pours into a mould：Molten steel calmness 7~8 minutes, are used in combination argon for protecting pouring, prevent secondary oxidation before cast；
(6) it demoulds：First the mould of progress a period of time is cold, and mould cool time presses formula T (h)=35R2(M) × 1.2, R is mould half
Diameter demoulds after cooling；
(7) it anneals：Annealing process is 680 DEG C × 10~15h, is come out of the stove air-cooled.
(8) it forges：Initial forging temperature be 1150 DEG C, final forging temperature >=850 DEG C, forging ratio >=2.0, ratio of elongation >=2.0, always than
>=4.0, it is made annealing treatment after forging, annealing process is come out of the stove air-cooled for 620 DEG C × 10~12h；
(9) forging roughing：Roughing is carried out to forging, and is detected using ultrasonic examination；
(10) property heat treatment：Solution treatment is carried out successively：1050 DEG C × 1h water coolings or oil cooling；Intermediate adjustment processing：850
DEG C × 1.5h oil cooling or water coolings；Ageing treatment：620 DEG C × 4~6h, water cooling；
(11) physical and chemical testing, dimension control are carried out after property heat treatment successively, finally obtains 520B precipitation-hardening stainless steels
Steel ingot finished product.
Chemical composition test see the table below：
Mechanics Performance Testing see the table below：
By above-mentioned test result it is found that the 520B precipitation-hardening stainless steel steel ingots of the application, compared with original 520B steel：S
From being optimized to≤0.005 originally≤0.015, sulphide inculsion is reduced, eliminates sulfide banded segregation；P is from original≤0.030 excellent
Change to≤0.015, reduce phosphorous segregation, improves impact flexibility；Room temperature impact work(AKV (J) was increased to >=70 from originally >=55.Together
When, EAF (electric arc furnaces)+VODC (vacuum refining furnace)+argon for protecting pouring is used smelting, reduces nonmetallic folder to the maximum extent
Sundries improves the degree of purity of molten steel, improves the quality of steel.
The preferred embodiment of the present invention has been described in detail above, it should be understood that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations, therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be in the protection domain being defined in the patent claims.
Claims (4)
1.520B precipitation-hardening stainless steel steel ingots, which is characterized in that chemical composition (wt%) by weight percentage is：C：0.042
~0.060；Mn：≤1.00；Si：≤0.65；S：≤0.005；P：≤0.015；Cr：13.0~14.5；Ni：5.0~6.0；Mo：
1.30~1.80；Cu：1.32~2.00；Nb：0.27~0.45, remaining Fe.
The production method of 2.520B precipitation-hardening stainless steel steel ingots, which is characterized in that include the following steps：
1) raw material select：Select S≤0.030%, the steel scraps of P≤0.030% and Cr, Ni, Mo, Cu, Nb alloy；
2) electric arc furnace smelting：Make C >=0.80%, Si≤0.70%, Mn≤1.0% in melting stage, Cr≤14.0%, Ni≤
6.0%, Mo≤1.80%, Cu≤1.8%, Nb≤0.45%, P≤0.020%；The heat of oxidation make decarburized amount >=0.40%, C >=
0.70%, P≤0.008%, S≤0.006%；Reducing agent is added in reduction period, molten steel and forms white slag, bath temperature is kept
1700 DEG C, subsequent molten steel is transferred to tundish, and skims in tundish, and level of residue≤1.5kg/t subsequently enters VODC vacuum fines
Furnace refines；
3) VODC vacuum refining furnaces refine：VOD stages, 80~120mbar of vacuum degree, oxygen flow 550M3/ h, argon flow 5M3/h；
VCD stages, vacuum degree≤5mbar, 10~15 minutes pumpdown times, argon flow 5M3/h；The VOH stages are often added by Metal Weight
250 DEG C of calculating can be improved in 1% aluminium, are warming up to 1650~1670 DEG C, 500~600M of oxygen flow3/ h, vacuum degree 350~
450mbar, argon flow 5M3/ h adjusts each ingredient to prescribed requirement；VD stages, vacuum degree≤1.0mbar, pumpdown time ＞
20 minutes, argon flow 5M3/h；
4) it taps：Molten steel is transferred to ladle at a temperature of 1600 DEG C, and 1.5~2.5kg/t silico-calcium deoxidiers are first added in ladle, work as steel
Swash of wave final deoxidizing when water enters ladle；
5) it pours into a mould：Molten steel calmness 7~8 minutes, are used in combination argon for protecting pouring, prevent secondary oxidation before cast；
6) it demoulds：It is cold first to carry out the mould of a period of time, is demoulded after cooling；
7) it anneals：Annealing process is 680 DEG C × 10~15h, is come out of the stove air-cooled；
8) it forges：Initial forging temperature be 1150 DEG C, final forging temperature >=850 DEG C, forging ratio >=2.0, ratio of elongation >=2.0, always than >=
4.0；
9) forging roughing：Roughing is carried out to forging, and is detected using ultrasonic examination；
10) property heat treatment：Solution treatment is carried out successively：1050 DEG C × 1h water coolings or oil cooling；Intermediate adjustment processing：850℃×
1.5h oil cooling or water cooling；Ageing treatment：620 DEG C × 4~6h, water cooling；
11) physical and chemical testing, dimension control are carried out after property heat treatment successively, finally obtain 520B precipitation-hardening stainless steels steel ingot at
Product.
3. the production method of 520B precipitation-hardening stainless steels steel ingot as claimed in claim 2, which is characterized in that carried out after forging
Annealing, annealing process are come out of the stove air-cooled for 620 DEG C × 10~12h.
4. the production method of 520B precipitation-hardening stainless steels steel ingot as claimed in claim 2, which is characterized in that mould cool time is pressed
Formula T (h)=35R2(M) × 1.2, R is mode radius.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109504835A (en) * | 2018-12-22 | 2019-03-22 | 中南大学 | A kind of copper tungsten enhancing austenitic stainless steel against corrosion and preparation method thereof |
| CN111074048A (en) * | 2019-12-31 | 2020-04-28 | 苏州雷格姆海洋石油设备科技有限公司 | Manufacturing method of 17-4PH material high-temperature and high-pressure resistant forging |
| CN111471940A (en) * | 2020-04-29 | 2020-07-31 | 钢铁研究总院 | High-strength stainless steel rotor and preparation method thereof |
| CN113088654A (en) * | 2021-04-06 | 2021-07-09 | 山西太钢不锈钢股份有限公司 | Production method for improving macrosegregation of niobium-containing ferrite stainless steel plate |
| CN113897531A (en) * | 2021-09-08 | 2022-01-07 | 三鑫重工机械有限公司 | Process for vacuum smelting of corrosion-resistant stainless steel by VOD method |
| CN114317923A (en) * | 2021-12-31 | 2022-04-12 | 无锡透平叶片有限公司 | Hot working process for improving short transverse impact performance of X5CrNiCuNb16-4 turbine blade |
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| CN117926117A (en) * | 2024-01-25 | 2024-04-26 | 浙江大隆合金钢有限公司 | Method for producing NO8810 steel ingot by VODC refining furnace |
| CN117926112A (en) * | 2024-01-25 | 2024-04-26 | 浙江大隆合金钢有限公司 | 316LN stainless steel ingot and preparation method thereof, and preparation method of 316LN stainless steel plate |
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Cited By (14)
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| CN109504835B (en) * | 2018-12-22 | 2022-03-15 | 佛山培根细胞新材料有限公司 | Copper-tungsten reinforced corrosion-resistant austenitic stainless steel and preparation method thereof |
| CN109504835A (en) * | 2018-12-22 | 2019-03-22 | 中南大学 | A kind of copper tungsten enhancing austenitic stainless steel against corrosion and preparation method thereof |
| CN111074048A (en) * | 2019-12-31 | 2020-04-28 | 苏州雷格姆海洋石油设备科技有限公司 | Manufacturing method of 17-4PH material high-temperature and high-pressure resistant forging |
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Application publication date: 20181002 |