CN107675091B - A kind of high-strength high-toughness and low-temperature military service cast steel material and heat treatment method - Google Patents
A kind of high-strength high-toughness and low-temperature military service cast steel material and heat treatment method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
Abstract
The present invention relates to material composition design and Field of Heat-treatment, specially a kind of high-strength high-toughness and low-temperature military service cast steel material (IMR-LS) and heat treatment methods.By weight percentage, the chemical composition ranges of cast steel material are as follows: C 0.13~0.24%, Mn 0.80~1.20%, Si 0.17~0.37%, P≤0.015%, S≤0.01%, Ni 1.40~2.50%, Cr 0.8~1.2%, Mo 0.2~0.4%, V 0.01~0.05%, Ti 0.01~0.04%, B+RE+Nb≤0.05%, surplus Fe.Homogenization and micronization heat treatment process are formulated according to the chemical component of steel, and chooses suitable temperature and is tempered, meets material property.The present invention is by preferred steel grade composition range and carries out peculiar heat treatment, finally making the low temperature military service cast steel material of preparation has high-strength and high ductility attribute, wherein yield strength >=655MPa, tensile strength >=795MPa, elongation percentage >=14%, the reduction of area at fracture is greater than 30%, and V mouthfuls of material impacts are greater than 27J in -45 DEG C of cold impact values.
Description
Technical field
The present invention relates to material composition design and Field of Heat-treatment, specially a kind of high-strength high-toughness and low-temperature military service cast steel materials
(IMR-LS) and heat treatment method.
Background technique
In oil exploitation tooling, high-intensitive cast steel material is generally required, and these steel-castings are under cryogenic
It is on active service, therefore while designing high-strength cast steel material, also to fully consider the influence to material property of Service Environment.
Chinese invention patent application (publication number CN 101381841A) discloses a kind of -50 DEG C of low-temperature steels of high-intensity and high-tenacity
And its manufacturing method, chemical component is by weight percentage are as follows: and C 0.12~0.20, Si 0.15~0.50, Mn 1.20~
1.70, P≤0.015, S≤0.010, Ni 0.30~1.00, Ti 0.005~0.050, Al 0.005~0.10, Nb 0.010
~0.050, additionally contain V≤0.10, Cu≤1.0, Mo≤0.50, Zr≤0.040, one of RE≤0.020 or one kind
More than, surplus Fe.Preparation method is: billet heating temperature is 1150~1280 DEG C, 8~14 minutes/cm of the rate of heat addition, steel
Start rolling temperature >=1100 DEG C, controlled rolling adds up reduction ratio >=60%, reduction ratio >=10% per pass of end three, finishing temperature 780
~860 DEG C；It is heat-treated using normalizing, normalizing holding temperature is 850~930 DEG C, and soaking time is 30~50 minutes+plate thickness (mm)
× 1 minute/mm.Disadvantage is that: the material that the patent is constrained is to handle that it is made to have high material by rolling deformation
Performance, and casting, then without deformation process, material property can significantly decay, and especially low-temperature impact toughness attenuation amplitude is bigger,
It is not able to satisfy this exploitation material performance requirement, therefore is badly in need of developing high-strength, the high toughness cast steel adding for being suitble to oil field under cryogenic conditions
Material.
Summary of the invention
The purpose of the present invention is to provide a kind of high-strength high-toughness and low-temperature military service cast steel material IMR-LS and heat treatment methods, make
This cast steel material can have the mechanical property of high-strength and high ductility, to meet the use need of oil exploitation tooling under cryogenic
It wants.
The technical scheme is that
A kind of high-strength high-toughness and low-temperature military service cast steel material, by weight percentage, the chemical composition ranges of cast steel material are such as
Under: C 0.13~0.24%, Mn 0.80~1.20%, Si 0.17~0.37%, P≤0.015%, S≤0.01%, Ni
1.40~2.50%, Cr 0.8~1.2%, Mo 0.2~0.4%, V 0.01~0.05%, Al 0.01~0.05%, Ti
0.01~0.04%, B+RE+Nb≤0.05%, surplus Fe.
The high-strength high-toughness and low-temperature military service cast steel material, it is preferred that B+RE+Nb=0.01~0.05%, in which: B
0.001~0.005%, RE 0.004%~0.025%, Nb 0.005~0.03%.
The high-strength high-toughness and low-temperature military service cast steel material, it is preferred that B 0.0015%, RE 0.015%, Nb
0.03%.
The heat treatment method of the high-strength high-toughness and low-temperature military service cast steel material is formulated according to the chemical component of steel and is homogenized
And micronization heat treatment process, and choose suitable temperature and be tempered, meet material property；Wherein, material property are as follows: surrender is strong
Degree >=655MPa, tensile strength >=795MPa, elongation percentage >=14%, the reduction of area at fracture are greater than 30%, and V mouthfuls of material impacts
It is greater than 27J in -45 DEG C of cold impact values.
The heat treatment method of the high-strength high-toughness and low-temperature military service cast steel material, it is uniform that cast steel material first carries out high temperature ingredient
Change processing, homogenization isothermal holding temperature are 900 DEG C~1000 DEG C, and the soaking time of Homogenization Treatments is selected by 1h/25mm thickness,
Furnace is come out of the stove after being as cold as 150 DEG C or less.
The heat treatment method of the high-strength high-toughness and low-temperature military service cast steel material, the ultra fine of cast steel material is in two times
Carry out: in 730~800 DEG C of progresss isothermal holdings, soaking time is selected by 1h/25mm thickness for selection first for the first time, then again into
880~920 DEG C of isothermal holdings of row, soaking time is selected by 1h/25mm thickness, and subsequent furnace is come out of the stove after being as cold as 150 DEG C or less；Second
In 730~800 DEG C of progress isothermal holdings, soaking time is selected by 1h/25mm thickness for selection first, then carries out 880~920 DEG C again
Isothermal holding, soaking time is selected by 1h/25mm thickness, and water quenching of then coming out of the stove is to room temperature.
The heat treatment method of the high-strength high-toughness and low-temperature military service cast steel material, the tempering temperature of cast steel material are selected as
630~660 DEG C, soaking time is selected by 1h/25mm thickness, carries out being furnace-cooled to room temperature after tempering.
The each Design of Chemical Composition thought and synergistic effect of high-strength high-toughness and low-temperature military service cast steel material of the present invention are: passing through
C, the constituent contents such as Cr, Mn, Ni, Mo, B are deployed, and understand the relationship between constituent content and material harden ability, intensity；By C,
The allotment of the constituent contents such as Ni, V, understands the relationship between element and toughness of material；Pass through microelement Ti, the allotment of Nb, rare earth
Have the function that refine crystal grain, the control of deoxidation is realized by the control of Si, Al content.
The heat treatment mechanism of high-strength high-toughness and low-temperature military service cast steel material of the present invention is: refining crystal grain using the solid-state phase changes of steel
Action principle makes cast steel material carry out original coarse grain decomposition in specific temperature, prevents crystal grain from growing up using precipitated phase.
The invention has the advantages and beneficial effects that:
1, the present invention develops a kind of high-strength and high ductility by designing cast steel ingredient and choosing special thermal treatment technique study
Cast steel material can satisfy oil exploitation tooling and use in low temperature service condition.Its property can satisfy: yield strength >=
655MPa, tensile strength >=795MPa, elongation percentage >=14%, the reduction of area at fracture is greater than 30%, and V mouthfuls of material impacts are -45
DEG C cold impact value is greater than 27J.
2, the steel grade of the invention performance after homogenization, ultra fine is stablized, can be on great key components and parts.
3, heat treatment method of the present invention can be widely used in the heat treatment of high-strength and high ductility steel-casting.
Specific embodiment
In the following, by embodiment, invention is further described in detail.
Embodiment 1
In the present embodiment, the cast steel ingredient of high-strength high-toughness and low-temperature military service cast steel material is as follows:
| Element | Content (wt%) |
| C | 0.13 |
| Mn | 0.8 |
| Si | 0.17 |
| P | 0.009 |
| S | 0.002 |
| Ni | 2.50 |
| Cr | 1.2 |
| Mo | 0.4 |
| V | 0.015 |
| Al | 0.05 |
| Ti | 0.01 |
| B+RE+Nb | 0.03；Wherein, B0.0010, RE0.0090, Nb0.02 |
| Fe | Surplus |
Heat treatment uses following steps: 1. casting is handled through 1000 DEG C of high temperature homogenization of composition, and soaking time presses 1h/25mm
Thickness is selected, and furnace is carried out after Homogenization Treatments and is as cold as 150 DEG C hereinafter, coming out and cooling down to room temperature.2. then casting carries out ultra-fine
Change processing, ultra fine carry out in two times: selecting 780 DEG C of progress isothermal holdings first for the first time, soaking time presses 1h/25mm
Thickness is selected, then carries out 920 DEG C of isothermal holdings again, and soaking time is selected by 1h/25mm thickness, and subsequent furnace is as cold as 150 DEG C hereinafter, going out
Furnace is cooled to room temperature；In 780 DEG C of progress isothermal holdings, soaking time is selected by 1h/25mm thickness for second of selection, then carries out again
920 DEG C of isothermal holdings, soaking time is selected by 1h/25mm thickness, and water quenching of then coming out of the stove is to room temperature.3. tempering temperature is selected as 630
DEG C, soaking time is selected by 1h/25mm thickness, carries out being furnace-cooled to room temperature after tempering.
After heat treatment, material property is as follows:
Yield strength 780MPa, tensile strength 850MPa, elongation percentage 15%, the reduction of area at fracture 35%, and V mouthfuls of material punchings
Hitting in -45 DEG C of cold impact values is 69J.
Embodiment 2
In the present embodiment, the cast steel ingredient of high-strength high-toughness and low-temperature military service cast steel material is as follows:
| Element | Content (wt%) |
| C | 0.20 |
| Mn | 1.2 |
| Si | 0.37 |
| P | 0.015 |
| S | 0.005 |
| Ni | 1.9 |
| Cr | 0.8 |
| Mo | 0.2 |
| V | 0.05 |
| Al | 0.01 |
| Ti | 0.04 |
| B+RE+Nb | 0.05；Wherein, B0.0015, RE0.0185, Nb0.03 |
| Fe | Surplus |
Heat treatment uses following steps: 1. casting is handled through 900 DEG C of high temperature homogenization of composition, and soaking time presses 1h/25mm
Thickness is selected, and furnace is carried out after Homogenization Treatments and is as cold as 150 DEG C hereinafter, coming out and cooling down to room temperature.2. then casting carries out ultra-fine
Change processing, ultra fine carry out in two times: selecting 730 DEG C of progress isothermal holdings first for the first time, soaking time presses 1h/25mm
Thickness is selected, then carries out 880 DEG C of isothermal holdings again, and soaking time is selected by 1h/25mm thickness, and subsequent furnace is as cold as 150 DEG C hereinafter, going out
Furnace is cooled to room temperature；In 730 DEG C of progress isothermal holdings, soaking time is selected by 1h/25mm thickness for second of selection, then carries out again
880 DEG C of isothermal holdings, soaking time is selected by 1h/25mm thickness, and water quenching of then coming out of the stove is to room temperature.3. tempering temperature is selected as 660
DEG C, soaking time is selected by 1h/25mm thickness, carries out being furnace-cooled to room temperature after tempering.
After heat treatment, material property is as follows:
Yield strength 750MPa, tensile strength 835MPa, elongation percentage 18%, the reduction of area at fracture 40%, and V mouthfuls of material punchings
Hitting in -45 DEG C of cold impact values is 57J.
Embodiment 3
In the present embodiment, the cast steel ingredient of high-strength high-toughness and low-temperature military service cast steel material is as follows:
| Element | Content (wt%) |
| C | 0.24 |
| Mn | 1.2 |
| Si | 0.37 |
| P | 0.015 |
| S | 0.01 |
| Ni | 1.4 |
| Cr | 1.2 |
| Mo | 0.6 |
| V | 0.05 |
| Al | 0.035 |
| Ti | 0.03 |
| B+RE+Nb | 0.05；Wherein, B0.0030, RE0.022, Nb0.025 |
| Fe | Surplus |
Heat treatment uses following steps: 1. casting is handled through 950 DEG C of high temperature homogenization of composition, and soaking time presses 1h/25mm
Thickness is selected, and furnace is carried out after Homogenization Treatments and is as cold as 150 DEG C hereinafter, coming out and cooling down to room temperature.2. then casting carries out ultra-fine
Change processing, ultra fine carry out in two times: selecting 800 DEG C of progress isothermal holdings first for the first time, soaking time presses 1h/25mm
Thickness is selected, then carries out 900 DEG C of isothermal holdings again, and soaking time is selected by 1h/25mm thickness, and subsequent furnace is as cold as 150 DEG C hereinafter, going out
Furnace is cooled to room temperature；In 800 DEG C of progress isothermal holdings, soaking time is selected by 1h/25mm thickness for second of selection, then carries out again
900 DEG C of isothermal holdings, soaking time is selected by 1h/25mm thickness, and water quenching of then coming out of the stove is to room temperature.3. tempering temperature is selected as 640
DEG C, soaking time is selected by 1h/25mm thickness, carries out being furnace-cooled to room temperature after tempering.
After heat treatment, material property is as follows:
Yield strength 670MPa, tensile strength 800MPa, elongation percentage 14%, the reduction of area at fracture 35%, and V mouthfuls of material punchings
Hitting in -45 DEG C of cold impact values is 37J.
Embodiment the result shows that, the cast steel material involved in the present invention arrived after heat treatment, can achieve high-strength and high ductility
Effect can satisfy in oil exploitation tooling to the needs of high-strength and high ductility cast steel.
Claims (3)
1. a kind of high-strength high-toughness and low-temperature military service cast steel material, which is characterized in that by weight percentage, cast steel material chemistry at
Divide range as follows: C 0.13~0.24%, Mn 0.80~1.20%, Si 0.17~0.37%, P≤0.015%, S≤
0.01%, Ni 1.40~2.50%, Cr 0.8~1.2%, Mo 0.2~0.4%, V 0.01~0.05%, Al 0.01~
0.05%, Ti 0.01~0.04%, B+RE+Nb≤0.05%, surplus Fe；
Homogenization and micronization heat treatment process are formulated according to the chemical component of steel, and chooses suitable temperature and is tempered, is met
Material property；Wherein, material property are as follows: yield strength >=655MPa, tensile strength >=795MPa, elongation percentage >=14%, fracture
Shrinking percentage is greater than 30%, and V mouthfuls of material impacts are greater than 27J in -45 DEG C of cold impact values；
Cast steel material first carries out high temperature homogenization of composition processing, and homogenization isothermal holding temperature is 900 DEG C~1000 DEG C, homogenization
The soaking time of processing is selected by 1h/25mm thickness, and furnace is come out of the stove after being as cold as 150 DEG C or less；
The ultra fine of cast steel material carries out in two times: selection is protected in 730~800 DEG C of progress isothermal holdings first for the first time
The warm time is selected by 1h/25mm thickness, then carries out 880~920 DEG C of isothermal holdings again, and soaking time is selected by 1h/25mm thickness, with
Furnace is come out of the stove after being as cold as 150 DEG C or less afterwards；Selection is in 730~800 DEG C of progress isothermal holdings first for the second time, and soaking time is by 1h/
25mm thickness is selected, then carries out 880~920 DEG C of isothermal holdings again, soaking time is selected by 1h/25mm thickness, water quenching of then coming out of the stove
To room temperature；
The tempering temperature of cast steel material is selected as 630~660 DEG C, and soaking time is selected by 1h/25mm thickness, and it is cold that furnace is carried out after tempering
To room temperature.
2. high-strength high-toughness and low-temperature military service cast steel material according to claim 1, which is characterized in that preferred, B+RE+Nb=
0.01~0.05%, in which: B 0.001~0.005%, RE 0.004%~0.025%, Nb 0.005~0.03%.
3. high-strength high-toughness and low-temperature military service cast steel material according to claim 2, which is characterized in that preferred, B
0.0015%, RE 0.015%, Nb 0.03%.
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| CN109439858A (en) * | 2018-11-23 | 2019-03-08 | 安徽应流铸业有限公司 | A kind of energy conservation and environmental protection process for quenching with water generation oil of double certification material casting |
| CN110157867B (en) * | 2019-04-29 | 2020-09-18 | 中国科学院金属研究所 | Control method for white abnormal structure in large-size CrMo steel member |
| CN111424222A (en) * | 2020-04-10 | 2020-07-17 | 宝鸡石油机械有限责任公司 | Steel casting for lifting system of ultra-deep well petroleum drilling machine and manufacturing method thereof |
| CN111363977A (en) * | 2020-05-07 | 2020-07-03 | 南京中盛铁路车辆配件有限公司 | Low-alloy cast steel for high-speed train brake disc, heat treatment method thereof and brake disc |
| CN114032462B (en) * | 2021-11-09 | 2023-02-24 | 河北工业大学 | High-strength and high-toughness low-alloy cast steel and preparation method thereof |
| CN114150234A (en) * | 2021-12-07 | 2022-03-08 | 中国科学院金属研究所 | Temperature-resistant high-strength steel material for valve body and preparation method thereof |
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| CN102549187A (en) * | 2009-09-25 | 2012-07-04 | 株式会社日本制钢所 | High-strength high-toughness cast steel material and manufacturing method therefor |
| CN101886223A (en) * | 2010-07-09 | 2010-11-17 | 清华大学 | Method for preparing high-strength high-toughness low alloy manganese series cast steel |
| CN102517516A (en) * | 2011-12-19 | 2012-06-27 | 张家港市鼎力铸钢有限公司 | Composite microalloyed high impact energy cast steel and manufacturing method thereof |
| CN105543706A (en) * | 2016-01-25 | 2016-05-04 | 太原理工大学 | High-strength high-toughness abrasion-resistant cast steel material and preparation method thereof |
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