CN107460406A - Middle carbon high-toughness superhigh intensity speciality steel and its production method - Google Patents

Middle carbon high-toughness superhigh intensity speciality steel and its production method Download PDF

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CN107460406A
CN107460406A CN201710726344.4A CN201710726344A CN107460406A CN 107460406 A CN107460406 A CN 107460406A CN 201710726344 A CN201710726344 A CN 201710726344A CN 107460406 A CN107460406 A CN 107460406A
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steel
toughness
speciality
superhigh intensity
carbon high
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闫志杰
胡勇
郑晓华
李怡宏
王效岗
刘坤
何少龙
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Taiyuan University of Science and Technology
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Taiyuan University of Science and Technology
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Abstract

The present invention relates to a kind of middle carbon high-toughness superhigh intensity speciality steel and its production method, it belongs to iron and steel smelting technology field.The present invention mainly solves low intensity existing for existing medium carbon steel, poor toughness and can not meet top load, high-frequency, the technical problem of large impact operating mode.The technical solution adopted by the present invention is：Middle carbon high-toughness superhigh intensity speciality steel, wherein：The composition expression formula of the speciality steel is CaSibMncMdFeeWherein M is made up of 2 kinds in Cu, Al, Ni, Nb, W, Bi, Ti, V, RE (rare earth), Cr, Ca, Mg, Mo, Sb, B, Zn and Zr or two or more alloying element with any percentage by weight, a, b, c, d, e are weight percentage, and a+b+c+d+e=100%.Advantages of the present invention is：1. using the alloying element of low cost；2. use common electric induction furnace melting, it is not necessary to vacuum environment；3. resulting mechanical property is all from not by the as-cast specimen of conducting forging processing processing.

Description

Middle carbon high-toughness superhigh intensity speciality steel and its production method
Technical field
The present invention relates to a kind of middle carbon high-toughness superhigh intensity speciality steel and its production method, it belongs to iron and steel smelting technology Field.
Background technology
Ferrous materials are the irreplaceable basic material of the development of the national economy and grand strategy goods and materials, be it is most widely used, The maximum 26S Proteasome Structure and Function material of yield, has the characteristics of performance is plastic, can be recycled.Generally, the intensity of steel and Toughness is conflict, and intensity is higher, and corresponding toughness is poorer.And under top load, high-frequency, the operating mode of large impact, it is necessary to Spare and accessory parts have both high intensity and high tenacity simultaneously.Under the fast-developing overall background of especially current high ferro, the gear of military service high ferro, Bearing, wheel equity propose higher requirement to performances such as intensity and toughness.
Low carbon high alloy steel cost is high, processing difficulties.By contrast, the cost of middle carbon high-alloy steel is relatively low, application field It is wider.The performance of carbon high-alloy steel is in typical case at present：Yield strength σs=800~900MPa, tensile strength sigmab=1000~ 1200MPa, impact flexibility αk=30~50J/cm2.The performance of these steel alloys not yet reaches unimach, and (yield strength is not Less than 1370MPa, tensile strength is not less than 1620MPa) requirement, the also very big rising space.Importantly, toughness compared with It is low, it is impossible to meet the operating mode of top load, high-frequency, large impact.
The content of the invention
Present invention aim to address low intensity, poor toughness existing for existing medium carbon steel and top load, high frequency can not be met The technical problem of rate, large impact operating mode, there is provided a kind of middle carbon high-toughness superhigh intensity speciality steel and its production method.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
Middle carbon high-toughness superhigh intensity speciality steel, wherein：The composition expression formula of the speciality steel is CaSibMncMdFee, wherein M By 2 kinds in Cu, Al, Ni, Nb, W, Bi, Ti, V, RE (rare earth), Cr, Ca, Mg, Mo, Sb, B, Zn and Zr or two or more alloy Element is formed with any percentage by weight, and a, b, c, d, e are weight percentage, and a+b+c+d+e=100%,
Further, the CaSibMncMdAlloying element total content a+b+c+d >=8.0%.
A kind of method for producing described middle carbon high-toughness superhigh intensity speciality steel, it is made up of the following steps：
1) percentage by weight according to the speciality composition of steel carries out feed proportioning, and the raw material of dispensing use simple metal Or steel scrap, the carburant for adjusting phosphorus content, the additional materials needed in fusion process of intermediate alloy, definite ingredients；
2) by the part steel scrap in step 1) dispensing and scaling loss be small and the metal of infusibility or intermediate alloy consolidation be placed in sense Electric melting furnace is answered, subsequently powers on fusing；Constantly toward addition dispensing in electric furnace melt in fusion process, until whole dispensings have melted Finish；The metal or intermediate alloy of easy scaling loss finally melt；
3) molten steel obtained to step 2) fusing carries out composition adjustment, the content of each element is in component requirements scope； Equitemperature carries out Metamorphism treatment after reaching 1550 DEG C, the addition of alterant is the 1.0~2.0% of Metal Weight；It is described rotten Agent is made up of the raw material of following weight percentage：Mischmetal 45%, rare earth ferrosilicon 15%, Alsical 30% and other micro- Alloying element 10% is measured, other trace alloying elements are made up of the raw material of following weight percentage：Zr 24%, Cu 21%th, Sb 28%, Bi 25% and B 2%；
4) molten steel after step 3) Metamorphism treatment is stood 3~5 minutes, is subsequently heated to 1600 DEG C to come out of the stove and pours into casting Part；
5) casting obtained to step 4) is heat-treated using annealing, quenching and tempering process, adjusts the performance of steel；Move back Fiery temperature, hardening heat Accm+ 50~100 DEG C, hardening media is water base or oil-based media；Temperature is not higher than 300 DEG C.
The invention has the advantages that the speciality steel produced by technical scheme, is not only obtained general The untouchable superhigh intensity of steel, more valuable is that of obtaining higher toughness.By optimized alloy composition and Technology for Heating Processing, Acquisition matrix is based on martensite, the carbide of small and dispersed distribution is used as the microstructure for strengthening phase；Obtain more than 1400MPa Yield strength, tensile strength more than 1800MPa and more than 100J/cm2Impact flexibility mechanical property.With prior art Compare, advantages of the present invention is：1. using the alloying element of low cost；2. use common electric induction furnace melting, it is not necessary to vacuum Environment；3. resulting mechanical property is all from not by the as-cast specimen of conducting forging processing processing.
The middle carbon high-toughness superhigh intensity speciality steel of the present invention has very big application potential in numerous areas, especially high Parts under load, high-frequency, large impact operating mode, such as the gear of high ferro, bearing, wheel equity.
Embodiment
Embodiment 1
The composition expression formula of middle carbon high-toughness superhigh intensity speciality steel in the present embodiment is CaSibMncMdFee, wherein M by The alloying element composition of following weight percentage：Cr 25%, Mo 20%, V 20%, Nb 10%, Ti 5%, the and of Cu 10% Al 10%, a, b, c, d, e are weight percentage, and a+b+c+d+e=100%, a=0.25%, b=0.7%, c=1.8%, D=6.0%.
A kind of method for producing above-mentioned middle carbon high-toughness superhigh intensity speciality steel, it is made up of the following steps：
1) steel scrap, ferromanganese, ferrochrome, molybdenum-iron, vanadium iron, ferro-niobium, titanium, copper, aluminium raw material are pressed into composition by weight percent dispensing 150kg, wherein silicon content are adjusted by rare earth ferrosilicon, and the content of carbon is adjusted by carburant；
2) the part steel scrap in step 1) dispensing is placed in intermediate frequency furnace the fusing that is powered, be added portionwise in fusion process The intermediate alloys such as ferrochrome, molybdenum-iron, vanadium iron, ferro-niobium, titanium, copper, aluminium and simple metal, are eventually adding ferromanganese；
3) molten steel obtained to step 2) fusing carries out composition adjustment, reaches claimed range.Reach 1550 Deng liquid steel temperature Metamorphism treatment is carried out after DEG C, the addition of alterant is the 1.0~2.0% of Metal Weight；The alterant is by following weight hundred Divide the raw material composition of ratio：Mischmetal 45%, rare earth ferrosilicon 15%, Alsical 30% and other trace alloying elements 10%, other trace alloying elements are made up of the raw material of following weight percentage：Zr 24%, Cu 21%, Sb 28%, Bi 25% and B 2%；
4) molten steel after step 3) Metamorphism treatment is stood 3~5 minutes, is subsequently heated to 1600 DEG C to come out of the stove and pours intoCylinder casting；
5) casting that step 4) obtains is heat-treated：1) anneal：After 900~1000 DEG C of temperatures 2~4 hours Air cooling after cooling to 400 DEG C with the furnace；2) quench：Water quenching after being incubated 1.0~1.5 hours at 800~850 DEG C；3) it is tempered：150 ~250 DEG C insulation 2~4 hours after air cooling.
The speciality steel produced as stated above, performance reach σs=1300~1350MPa, tensile strength sigmab=1600~ 1650MPa, impact flexibility αk≥200J/cm2。
Embodiment 2
The composition expression formula of middle carbon high-toughness superhigh intensity speciality steel in the present embodiment is CaSibMncMdFee, wherein M by The alloying element composition of following weight percentage：Cr 20%, Mo 25%, V 25%, Nb 10%, Ti 10%, Cu 5%, Al 5%, a, b, c, d, e are weight percentage, and a+b+c+d+e=100%, a=0.35%, b=0.5%, c=1.3%, d= 7.0%.
A kind of method for producing above-mentioned middle carbon high-toughness superhigh intensity speciality steel, it is made up of the following steps：
1) raw material such as steel scrap, ferromanganese, ferrochrome, molybdenum-iron, vanadium iron, ferro-niobium, titanium, copper, aluminium are matched somebody with somebody by composition by weight percent Expect 150kg, the content of wherein silicon is adjusted by rare earth ferrosilicon, and the content of carbon is adjusted by carburant；
2) the part steel scrap in step 1) dispensing is placed in intermediate frequency furnace the fusing that is powered, be added portionwise in fusion process Ferrochrome, molybdenum-iron, vanadium iron, ferro-niobium, titanium, copper, aluminium intermediate alloy and simple metal, are eventually adding ferromanganese；
3) molten steel obtained to step 2) fusing carries out composition adjustment, reaches claimed range, waits liquid steel temperature to reach 1550 Metamorphism treatment is carried out after DEG C, the addition of alterant is the 1.0~1.5% of Metal Weight；The alterant is by following weight hundred Divide the raw material composition of ratio：Mischmetal 45%, rare earth ferrosilicon 15%, Alsical 30% and other trace alloying elements 10%, other trace alloying elements are made up of the raw material of following weight percentage：Zr 24%, Cu 21%, Sb 28%, Bi 25% and B 2%；
4) molten steel after step 3) Metamorphism treatment is stood 3~5 minutes, is subsequently heated to 1600 DEG C to come out of the stove and pours intoCylinder casting；
5) casting that step 4) obtains is heat-treated：1) anneal：After 900~1000 DEG C of temperatures 2~4 hours Air cooling after cooling to 400 DEG C with the furnace；2) quench：Water quenching after being incubated 1.0~1.5 hours at 800~850 DEG C；3) it is tempered：150 ~250 DEG C insulation 2~4 hours after air cooling.
The speciality steel produced as stated above, performance reach σs=1350~1400MPa, tensile strength sigmab=1650~ 1700MPa, impact flexibility αk≥150J/cm2。
Embodiment 3
The composition expression formula of middle carbon high-toughness superhigh intensity speciality steel in the present embodiment is CaSibMncMdFee, wherein M by The alloying element composition of following weight percentage：Cr20%, Mo 25%, V 25%, Nb 10%, Ti 10%, Cu 5% and W 5%, a, b, c, d, e are weight percentage, and a+b+c+d+e=100%, a=0.45%, b=0.3%, c=0.9%, d= 8.0%.
A kind of method for producing above-mentioned middle carbon high-toughness superhigh intensity speciality steel, it is made up of the following steps：
1) raw materials such as steel scrap, ferromanganese, ferrochrome, molybdenum-iron, vanadium iron, ferro-niobium, ferrotungsten, titanium, copper are matched somebody with somebody by composition by weight percent Expect 150kg, the content of wherein silicon is adjusted by rare earth ferrosilicon, and the content of carbon is adjusted by carburant；
2) the part steel scrap in step 1) dispensing is placed in intermediate frequency furnace the fusing that is powered, be added portionwise in fusion process The intermediate alloys such as ferrochrome, molybdenum-iron, vanadium iron, ferro-niobium, ferrotungsten, titanium, copper and simple metal, are eventually adding ferromanganese；
3) molten steel obtained to step 2) fusing carries out composition adjustment, reaches claimed range, waits liquid steel temperature to reach 1550 Metamorphism treatment is carried out after DEG C, the addition of alterant is the 1.0~1.5% of Metal Weight；The alterant is by following weight hundred Divide the raw material composition of ratio：Mischmetal 45%, rare earth ferrosilicon 15%, Alsical 30% and other trace alloying elements 10%, other trace alloying elements are made up of the raw material of following weight percentage：Zr 24%, Cu 21%, Sb 28%, Bi 25% and B 2%；
4) molten steel after step 3) Metamorphism treatment is stood 3~5 minutes, is subsequently heated to 1600 DEG C to come out of the stove and pours intoCylinder casting；
5) casting that step 4) obtains is heat-treated：1) anneal：After 900~1000 DEG C of temperatures 2~4 hours Air cooling after cooling to 400 DEG C with the furnace；2) quench：Water quenching after being incubated 1.0~1.5 hours at 800~850 DEG C；3) it is tempered：150 ~250 DEG C insulation 2~4 hours after air cooling.
The speciality steel produced as stated above, performance reach σs=1400~1450MPa, tensile strength sigmab=1700~ 1800MPa, impact flexibility αk≥100J/cm2。
M in above-described embodiment can also by Cu, Al, Ni, Nb, W, Bi, Ti, V, RE (rare earth), Cr, Ca, Mg, Mo, Sb, B, 2 kinds in Zn and Zr or two or more alloying element are formed with any percentage by weight.
Further, the CaSibMncMdAlloying element total content a+b+c+d >=8.0%.

Claims (3)

  1. Carbon high-toughness superhigh intensity speciality steel in 1., it is characterised in that：The composition expression formula of the speciality steel is CaSibMncMdFee, Wherein M is by 2 kinds in Cu, Al, Ni, Nb, W, Bi, Ti, V, RE, Cr, Ca, Mg, Mo, Sb, B, Zn and Zr or two or more alloy member Element is formed with any percentage by weight, and a, b, c, d, e are weight percentage, and a+b+c+d+e=100%,
  2. 2. middle carbon high-toughness superhigh intensity speciality steel according to claim 1, it is characterised in that：The CaSibMncMdAlloy Element total content a+b+c+d >=8.0%.
  3. A kind of 3. method for producing the middle carbon high-toughness superhigh intensity speciality steel described in claim 1 or 2, it is characterised in that under Row step forms：
    1) percentage by weight according to the speciality composition of steel carries out feed proportioning, the raw material of dispensing using simple metal or in Between alloy, the steel scrap of definite ingredients, the carburant for adjusting phosphorus content, the additional materials needed in fusion process；
    2) by the part steel scrap in step 1) dispensing and scaling loss be small and the metal of infusibility or intermediate alloy consolidation to be placed in sensing molten Electric furnace is refined, subsequently powers on fusing；Constantly toward addition dispensing in electric furnace melt in fusion process, until the fusing of whole dispensings finishes； The metal or intermediate alloy of easy scaling loss finally melt；
    3) molten steel obtained to step 2) fusing carries out composition adjustment, the content of each element is in component requirements scope；Isothermal Degree carries out Metamorphism treatment after reaching 1550 DEG C, the addition of alterant is the 1.0~2.0% of Metal Weight；The alterant by The raw material composition of following weight percentage：Mischmetal 45%, rare earth ferrosilicon 15%, Alsical 30% and other micro conjunctions Gold element 10%, other trace alloying elements are made up of the raw material of following weight percentage：Zr 24%, Cu 21%, Sb 28%th, Bi 25% and B 2%；
    4) molten steel after step 3) Metamorphism treatment is stood 3~5 minutes, is subsequently heated to 1600 DEG C to come out of the stove and pours into casting；
    5) casting obtained to step 4) is heat-treated using annealing, quenching and tempering process, adjusts the performance of steel；Annealing temperature Degree, hardening heat Accm+ 50~100 DEG C, hardening media is water base or oil-based media；Temperature is not higher than 300 DEG C.
CN201710726344.4A 2017-08-22 2017-08-22 Middle carbon high-toughness superhigh intensity speciality steel and its production method Pending CN107460406A (en)

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Application publication date: 20171212