CN106636884A - Large steel casting of G17CrMo9-10 material and production method thereof - Google Patents

Large steel casting of G17CrMo9-10 material and production method thereof Download PDF

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Publication number
CN106636884A
CN106636884A CN201610862810.7A CN201610862810A CN106636884A CN 106636884 A CN106636884 A CN 106636884A CN 201610862810 A CN201610862810 A CN 201610862810A CN 106636884 A CN106636884 A CN 106636884A
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foundry goods
casting
thickest
g17crmo9
stove
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CN106636884B (en
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杨爱宁
冯周荣
李少雨
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Kocel Steel Foundry Co Ltd
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Kocel Steel Foundry Co Ltd
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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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/30—Stress-relieving
    • 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
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention provides a large steel casting of a G17CrMo9-10 material and a production method thereof. The production method comprises the steps of furnace feeding, quenching, tempering, casting defect detection and repair welding, stress relief after process welding and stress relief after final welding. As Ni element is added in a conventional low-alloy material steel casting, the strength of the casting is largely increased; and when the steel casting is quenched in the preparation process, the Ni element is added to improve the casting hardenability, so that the quenched casting is excellent in performance.

Description

A kind of large-scale steel-casting and its production method of G17CrMo9-10 materials
Technical field
The present invention relates to Steel Castings technical field, more particularly to a kind of large-scale steel-casting of G17CrMo9-10 materials And its production method.
Background technology
G17CrMo9-10 materials are a kind of low alloy materials, are mainly used in the gas turbine of generating equipment main force type, mesh It is front to there are wide market prospects.But, used as large-scale steel-casting, because the tonnage of foundry goods, wall thickness are larger, the material is in production During have that mechanical property is unstable, the excessive problem of body hardness control deviation needs to be solved as early as possible.
The content of the invention
It is necessary to propose that a kind of intensity is high, hardness is high, the large cast steel of the G17CrMo9-10 materials of high comprehensive performance Part.
There is a need to the production method for proposing a kind of large-scale steel-casting of G17CrMo9-10 materials.
A kind of large-scale steel-casting of G17CrMo9-10 materials, the chemistry of the large-scale steel-casting of the G17CrMo9-10 materials Composition is C：0.13～0.20%, Si≤0.60%, Mn：0.50～0.90%, S≤0.020%, P≤0.020%, Cr：2.00 ～2.50%, Mo：0.9～1.20%, Ni：0.2～0.4%, V<0.05%th, Cu<0.3%, balance of iron.
Preferably, the chemical composition of the large-scale steel-casting of the G17CrMo9-10 materials is C：0.16～0.19%, Si： 0.30～0.50%, Mn：0.60～0.85%, S≤0.015%, P≤0.019%, Cr：2.15～2.45%, Mo：0.92～ 1.10%th, Ni：0.2～0.4%, V<0.05%th, Cu<0.3%, balance of iron.
A kind of production method of the large-scale steel-casting of G17CrMo9-10 materials, including heat treatment process, it is described heat treated Journey is included into stove, quenching, tempering, casting defect detection and soldering, process postwelding stress-removal, final postwelding stress-removal step；
Enter stove：Foundry goods is sent into heat-treatment furnace, AC is heated to the programming rate of 100 DEG C/h of ＜3+ (50～100) DEG C, during insulation Between calculate according to the thickest of foundry goods, computational methods are multiplied by 1h/25mm for thickest,
AC3- 203 DEG C of (DEG C)=910 DEG C * (%C)1/2- 15.2 DEG C of+44.7 DEG C of * (%Ni)+104 DEG C of * (%Si) * (%V)+31.5 DEG C * (%Mo)；
Quenching：Quenching liquid quenching is quickly entered after foundry goods is come out of the stove, keeps foundry goods into 750 DEG C of temperature ＞ during quenching liquid, quenched 40 DEG C of temperature ＜ of fiery liquid, hardening media adopt concentration for 10%～12% PAG polymer, the cool time according to foundry goods most Big wall thickness is calculated, and computational methods are multiplied by 2min/mm for thickest, to reduce the risk of casting deformation and cracking；
Tempering：Foundry goods is fed again into heat-treatment furnace, with the programming rate of 70 DEG C/h of ＜, foundry goods 720 ± 10 DEG C is heated into, Insulation, then with the speed cooling down of 70 DEG C/h of ＜, is cooled to 260 DEG C of air coolings of coming out of the stove of ＜, and tempering insulation time is according to foundry goods Thickest calculate, computational methods are multiplied by 2min/mm for thickest；
Casting defect is detected and soldering：Defects detection, and soldering are carried out to foundry goods；
Process postwelding stress-removal：Foundry goods after soldering is entered into heat to come out of the stove the process of carrying out high temperature stress-removal, process high temperature stress-removal Holding temperature is 680 ± 10 DEG C, and temperature retention time is calculated according to the thickest in the soldering area of foundry goods, and computational methods are soldering area Thickest is multiplied by 2min/mm, then by foundry goods with the speed cooling down of 70 DEG C/h of ＜, is cooled to 260 DEG C of air coolings of coming out of the stove of ＜；
Final postwelding stress-removal：By the foundry goods Jing after the postwelding stress-removal step process in process enter again heat come out of the stove carry out it is final High temperature stress-removal, 700 ± 5 DEG C of the holding temperature of final high temperature stress-removal, temperature retention time is calculated according to foundry goods thickest, is calculated Method is the thickest * 2min/mm of foundry goods, then by foundry goods with the speed cooling down of 70 DEG C/h of ＜, is cooled to 260 DEG C of ＜ Come out of the stove air cooling.
Preferably, the in-furnace temperature confonnality deviations of the heat-treatment furnace<10℃.
Preferably, prop up also between the foundry goods bottom and heat-treatment furnace and put parallels, the height >=700mm of the parallels.
The present invention by adding Ni elements in conventional low alloy material steel-casting, so as to increase substantially the strong of foundry goods Degree, also, steel-casting is in hardening step during preparation, and the addition of Ni elements can improve the quenching degree of foundry goods so that The function admirable of foundry goods after quenching.
Specific embodiment
Embodiments provide a kind of large-scale steel-casting of G17CrMo9-10 materials, the G17CrMo9-10 materials Large-scale steel-casting chemical composition be C：0.13～0.20%, Si≤0.60%, Mn：0.50～0.90%, S≤0.020%, P≤0.020%, Cr：2.00～2.50%, Mo：0.9～1.20%, Ni：0.2～0.4%, V<0.05%th, Cu<0.3%, it is remaining Measure as iron.
Further, the chemical composition of the large-scale steel-casting of the G17CrMo9-10 materials is C：0.16～0.19%, Si：0.30～0.50%, Mn：0.60～0.85%, S≤0.015%, P≤0.019%, Cr：2.15～2.45%, Mo：0.92 ～1.10%, Ni：0.2～0.4%, V<0.05%th, Cu<0.3%, balance of iron.
The present invention by adding Ni elements in conventional low alloy material steel-casting, so as to increase substantially the strong of foundry goods Degree, also, steel-casting is in hardening step during preparation, and the addition of Ni elements can improve the quenching degree of foundry goods so that The function admirable of foundry goods after quenching.
It is different from prior art in the present invention to also reside in, carbon equivalent Ceq that the technical program passes through control steel-casting product, And then according to Ceq controlling intensity, the hardness of foundry goods, to improve the mechanical property of foundry goods.Because Ceq is affected by multiple element Aggregate parameter value is obtained, is compared to control a certain performance of foundry goods by controlling single-element, Ceq can more reflect the comprehensive of foundry goods Close performance.
The present invention also proposes a kind of production method of the large-scale steel-casting of G17CrMo9-10 materials, including heat treatment step, The heat treatment step includes into stove, quenching, tempering, casting defect detection and soldering, process postwelding stress-removal, final postwelding disappearing Stress；
Enter stove：Foundry goods is sent into heat-treatment furnace, AC is heated to the programming rate of 100 DEG C/h of ＜3+ (50～100) DEG C, during insulation Between calculate according to the thickest of foundry goods, computational methods are multiplied by 1h/25mm for thickest,
AC3- 203 DEG C of (DEG C)=910 DEG C * (%C)1/2- 15.2 DEG C of+44.7 DEG C of * (%Ni)+104 DEG C of * (%Si) * (%V)+31.5 DEG C * (%Mo)；
Wherein AC3For austenitizing temperature, AC different according to casting composition3It is calculated according to above-mentioned formula, so as to according to casting The chemical composition of part is so more beneficial for the control of the performance to foundry goods controlling temperature.
Quenching：Quenching liquid quenching is quickly entered after foundry goods is come out of the stove, foundry goods is kept into temperature ＞ 750 during quenching liquid DEG C, 40 DEG C of temperature ＜ of quenching liquid, hardening media adopt concentration for 10%～12% PAG polymer, the cool time is according to casting The thickest of part is calculated, and computational methods are multiplied by 2min/mm for thickest, to reduce the risk of casting deformation and cracking；
Tempering：Foundry goods is fed again into heat-treatment furnace, with the programming rate of 70 DEG C/h of ＜, foundry goods 720 ± 10 DEG C is heated into, Insulation, then with the speed cooling down of 70 DEG C/h of ＜, is cooled to 260 DEG C of air coolings of coming out of the stove of ＜, and tempering insulation time is according to foundry goods Thickest calculate, computational methods are multiplied by 2min/mm for thickest；
Casting defect is detected and soldering：Defects detection, and soldering are carried out to foundry goods；
Process postwelding stress-removal：Foundry goods after soldering is entered into heat to come out of the stove the process of carrying out high temperature stress-removal, process high temperature stress-removal Holding temperature is 680 ± 10 DEG C, and temperature retention time is calculated according to the thickest in the soldering area of foundry goods, and computational methods are soldering area Thickest is multiplied by 2min/mm, then by foundry goods with the speed cooling down of 70 DEG C/h of ＜, is cooled to 260 DEG C of air coolings of coming out of the stove of ＜；
Temperature, time during process high temperature stress-removal are calculated according to the thickest in soldering area in this step, because soldering area There is thicker than the thickest of foundry goods or thin phenomenon in thickness, so this step is controlled according to the maximum gauge in soldering area Temperature and time, so that soldering area stress-removal is fully, thoroughly.
Final postwelding stress-removal：Foundry goods Jing after the postwelding stress-removal step process in process is entered again into heat coming out of the stove is carried out Final high temperature stress-removal, 700 ± 5 DEG C of the holding temperature of final high temperature stress-removal, temperature retention time is calculated according to foundry goods thickest, Computational methods are the thickest * 2min/mm of foundry goods, then foundry goods are cooled into ＜ with the speed cooling down of 70 DEG C/h of ＜ 260 DEG C of air coolings of coming out of the stove.
This step is the final stress-removal to foundry goods, so temperature and time is calculated according to foundry goods thickest, and should 700 ± 5 DEG C of temperature is more than 680 ± 10 DEG C of process high temperature stress-removal, and thoroughly stress-removal can not only be carried out to foundry goods, and, For soldering area has been also carried out supplementary stress-removal again, it is to avoid soldering area yet suffers from residual stress.
Further, the in-furnace temperature confonnality deviations of the heat-treatment furnace<10 DEG C, and foundry goods is placed on the effective of heat-treatment furnace In the thermal treatment zone, foundry goods, apart from ＞ 500mm, avoids quirk with surrounding burner hearth.
Further, prop up also between the foundry goods bottom and heat-treatment furnace and put parallels, the height >=700mm of the parallels, Two laid parallel parallels spacing 500mm.To prevent foundry goods hot-spot
Foundry goods to being produced using said method is sampled, and carries out chemical composition detection and analysis to sample, obtains following table：
C, Si, Mn, P, S, Cr, Mo, Ni constituent content and other performance parameters in upper table is by chemical composition analysis, detection Obtain, and carbon equivalent Ceq is calculated according to below equation：
Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15
Understand, carbon equivalent is embodied by the combination property of multiple element, be can be seen that in table when carbon equivalent >=0.93, foundry goods Various performance parameters it is excellent so that between high comprehensive performance.
Step in present invention method can according to actual needs carry out order adjustment, merge and delete.
Module or unit in embodiment of the present invention device can according to actual needs be merged, divide and deleted.
Above disclosed is only present pre-ferred embodiments, can not limit the right model of the present invention with this certainly Enclose, one of ordinary skill in the art will appreciate that all or part of flow process of above-described embodiment is realized, and will according to right of the present invention Made equivalent variations are sought, the covered scope of invention is still fallen within.

Claims (5)

1. a kind of large-scale steel-casting of G17CrMo9-10 materials, it is characterised in that：The Big Steel Castings of the G17CrMo9-10 materials The chemical composition of steel part is C：0.13～0.20%, Si≤0.60%, Mn：0.50～0.90%, S≤0.020%, P≤0.020%, Cr：2.00～2.50%, Mo：0.9～1.20%, Ni：0.2～0.4%, V<0.05%、Cu<0.3%, balance of iron.
2. a kind of large-scale steel-casting of G17CrMo9-10 materials as claimed in claim 1, it is characterised in that：It is described The chemical composition of the large-scale steel-casting of G17CrMo9-10 materials is C：0.16～0.19%, Si：0.30～0.50%, Mn：0.60～ 0.85%、S≤0.015%、P≤0.019%、Cr：2.15～2.45%, Mo：0.92～1.10%, Ni：0.2～0.4%, V<0.05%、 Cu<0.3%, balance of iron.
3. a kind of production method of the large-scale steel-casting of G17CrMo9-10 materials as claimed in claim 2, it is characterised in that： Including heat treatment process, the heat treatment process includes into stove, quenching, tempering, casting defect detection and soldering, process postwelding disappearing Stress, final postwelding stress-removal step；
Enter stove：Foundry goods is sent into heat-treatment furnace, AC is heated to the programming rate of 100 DEG C/h of ＜3+（50～100）DEG C, during insulation Between calculate according to the thickest of foundry goods, computational methods are multiplied by 1h/25mm, AC for thickest3（℃）=910℃-203℃*(% C)1/2-15.2℃*(%Ni)+44.7℃*(%Si)+104℃*(%V)+
31.5℃*(%Mo)；
Quenching：Quenching liquid quenching is quickly entered after foundry goods is come out of the stove, keeps foundry goods into 750 DEG C of temperature ＞ during quenching liquid, quenched 40 DEG C of temperature ＜ of fiery liquid, hardening media adopt concentration for 10%～12% PAG polymer, the cool time according to foundry goods maximum Wall thickness is calculated, and computational methods are multiplied by 2min/mm for thickest, to reduce the risk of casting deformation and cracking；
Tempering：Foundry goods is fed again into heat-treatment furnace, with the programming rate of 70 DEG C/h of ＜, foundry goods 720 ± 10 DEG C is heated into, Insulation, then with the speed cooling down of 70 DEG C/h of ＜, is cooled to 260 DEG C of air coolings of coming out of the stove of ＜, and tempering insulation time is according to foundry goods Thickest calculate, computational methods are multiplied by 2min/mm for thickest；
Casting defect is detected and soldering：Defects detection, and soldering are carried out to foundry goods；
Process postwelding stress-removal：Foundry goods after soldering is entered into heat to come out of the stove the process of carrying out high temperature stress-removal, process high temperature stress-removal Holding temperature is 680 ± 10 DEG C, and temperature retention time is calculated according to the thickest in the soldering area of foundry goods, and computational methods are soldering area Thickest is multiplied by 2min/mm, then by foundry goods with the speed cooling down of 70 DEG C/h of ＜, is cooled to 260 DEG C of air coolings of coming out of the stove of ＜；
Final postwelding stress-removal：By the foundry goods Jing after the postwelding stress-removal step process in process enter again heat come out of the stove carry out it is final High temperature stress-removal, 700 ± 5 DEG C of the holding temperature of final high temperature stress-removal, temperature retention time is calculated according to foundry goods thickest, is calculated Method is the thickest * 2min/mm of foundry goods, then by foundry goods with the speed cooling down of 70 DEG C/h of ＜, is cooled to 260 DEG C of ＜ Come out of the stove air cooling.
4. a kind of production method of the large-scale steel-casting of G17CrMo9-10 materials as claimed in claim 3, it is characterised in that： The in-furnace temperature confonnality deviations of the heat-treatment furnace<10℃.
5. a kind of production method of the large-scale steel-casting of G17CrMo9-10 materials as claimed in claim 4, it is characterised in that： Prop up also between the foundry goods bottom and heat-treatment furnace and put parallels, the height >=700mm of the parallels.
CN201610862810.7A 2016-09-29 2016-09-29 A kind of large-scale steel-casting and its production method of G17CrMo9-10 materials Active CN106636884B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107312912A (en) * 2017-07-03 2017-11-03 共享铸钢有限公司 Improve the heat treatment method of steel-casting yield strength
CN107604245A (en) * 2017-09-05 2018-01-19 共享铸钢有限公司 A kind of preparation method of heat-resisting CrMoV steel-castings and heat-resisting CrMoV cast steel materials
CN107988552A (en) * 2017-11-17 2018-05-04 共享铸钢有限公司 Large nuclear-power outer shell method for casting production
CN109338084A (en) * 2018-11-23 2019-02-15 安徽应流集团霍山铸造有限公司 Polished surface guard method when a kind of pair of steel-casting post weld heat treatment

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CN104862616A (en) * 2015-04-28 2015-08-26 江阴兴澄特种钢铁有限公司 Large-thickness high-toughness container steel plate and manufacturing method thereof

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CN103205645A (en) * 2013-02-26 2013-07-17 舞阳钢铁有限责任公司 Superlarge thickness hydrogen chromium molybdenum steel plate for hydrogenation equipment and manufacture method thereof
CN104862616A (en) * 2015-04-28 2015-08-26 江阴兴澄特种钢铁有限公司 Large-thickness high-toughness container steel plate and manufacturing method thereof

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107312912A (en) * 2017-07-03 2017-11-03 共享铸钢有限公司 Improve the heat treatment method of steel-casting yield strength
CN107604245A (en) * 2017-09-05 2018-01-19 共享铸钢有限公司 A kind of preparation method of heat-resisting CrMoV steel-castings and heat-resisting CrMoV cast steel materials
CN107988552A (en) * 2017-11-17 2018-05-04 共享铸钢有限公司 Large nuclear-power outer shell method for casting production
CN109338084A (en) * 2018-11-23 2019-02-15 安徽应流集团霍山铸造有限公司 Polished surface guard method when a kind of pair of steel-casting post weld heat treatment

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