CN106636884B - A kind of large-scale steel-casting and its production method of G17CrMo9-10 materials - Google Patents

A kind of large-scale steel-casting and its production method of G17CrMo9-10 materials Download PDF

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CN106636884B
CN106636884B CN201610862810.7A CN201610862810A CN106636884B CN 106636884 B CN106636884 B CN 106636884B CN 201610862810 A CN201610862810 A CN 201610862810A CN 106636884 B CN106636884 B CN 106636884B
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casting
removal
thickest
heat
stress
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CN106636884A (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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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • C21D1/30Stress-relieving
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/16Ferrous alloys, e.g. steel alloys containing copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium

Abstract

The present invention provides a kind of large-scale steel-castings and production method of 10 materials of G17CrMo9, including into stove, quenching, tempering, casting defect detection and soldering, process postwelding stress-removal, final postwelding stress-removal step, the present invention in conventional low alloy material steel-casting by adding in Ni elements, so as to increase substantially the intensity of casting, and, for steel-casting in hardening step during preparation, the addition of Ni elements can improve the quenching degree of casting so that the function admirable of casting after quenching.

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-castings of G17CrMo9-10 materials And its production method.
Background technology
G17CrMo9-10 materials are a kind of low alloy materials, are mainly used for the gas turbine of generating equipment main force type, mesh Before there are vast market prospects.But as large-scale steel-casting, since the tonnage of casting, wall thickness are larger, which is producing During there are unstable mechanical property, the problem of body hardness control deviation is excessive, need 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 high comprehensive performance G17CrMo9-10 materials Part.
It 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 Ingredient 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%, surplus is 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%, surplus is iron.
A kind of production method of the large-scale steel-casting of G17CrMo9-10 materials, it is described heat treated including heat treatment process Journey is included into stove, quenching, tempering, casting defect detection and soldering, process postwelding stress-removal, final postwelding stress-removal step;
Into stove:Casting is sent into heat-treatment furnace, AC is heated to the heating rate of 100 DEG C/h of <3+ (50~100) DEG C are protected The warm time calculates according to the thickest of casting, and 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+104 DEG C of * (%Si) of+44.7 DEG C of * (%Ni) * (%V)+ 31.5 DEG C of * (%Mo);
Quenching:Quenching liquid quenching is quickly entered after casting is come out of the stove, holding casting enters the temperature > 750 during quenching liquid DEG C, 40 DEG C of the temperature < of quenching liquid, hardening media uses concentration, and for 10%~12% PAG polymer, the cool time is according to casting The thickest of part calculates, and computational methods are multiplied by 2min/mm for thickest, to reduce the risk of casting deformation and cracking;
Tempering:Casting is fed again into heat-treatment furnace, with the heating rate of 70 DEG C/h of <, casting is heated to 720 ± 10 DEG C, heat preservation, then with the speed cooling down of 70 DEG C/h of <, be cooled to 260 DEG C of < come out of the stove it is air-cooled, tempering insulation time according to The thickest of casting calculates, and computational methods are multiplied by 2min/mm for thickest;
Casting defect detects and soldering:Defects detection, and soldering are carried out to casting;
Process postwelding stress-removal:Casting after soldering is come out of the stove carry out process high temperature stress-removal into heat, process high temperature disappears should The holding temperature of power is 680 ± 10 DEG C, and soaking time is calculated according to the thickest in the soldering area of casting, and computational methods are soldering The thickest in area is multiplied by 2min/mm, and then casting is cooled to 260 DEG C of < and is come out of the stove with the speed cooling down of 70 DEG C/h of < It is air-cooled;
Final postwelding stress-removal:Casting after postwelding stress-removal step process during is come out of the stove progress again into heat Final high temperature stress-removal, 700 ± 5 DEG C of the holding temperature of final high temperature stress-removal, soaking time are calculated according to casting thickest, Computational methods are the thickest * 2min/mm of casting, and casting then is cooled to < with the speed cooling down of 70 DEG C/h of < 260 DEG C come out of the stove it is air-cooled.
Preferably, the in-furnace temperature confonnality deviations of the heat-treatment furnace<10℃.
Preferably, branch puts parallels, height >=700mm of the parallels also between the casting bottom and heat-treatment furnace.
The present invention in conventional low alloy material steel-casting by adding in Ni elements, so as to increase substantially the strong of casting Degree, also, steel-casting, in hardening step during preparation, the addition of Ni elements can improve the quenching degree of casting so that The function admirable of casting after quenching.
Specific embodiment
An embodiment of the present invention provides 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 It measures 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%, surplus is iron.
The present invention in conventional low alloy material steel-casting by adding in Ni elements, so as to increase substantially the strong of casting Degree, also, steel-casting, in hardening step during preparation, the addition of Ni elements can improve the quenching degree of casting so that The function admirable of casting after quenching.
The prior art is different from the present invention to also reside in, the technical program by controlling the carbon equivalent Ceq of steel-casting product, And then the intensity of casting, hardness are controlled according to Ceq, to improve the mechanical property of casting.Because Ceq is influenced by multiple element Aggregate parameter value is obtained, is compared to control a certain performance of casting by controlling single-element, Ceq can more reflect the comprehensive of casting 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 disappearing into stove, quenching, tempering, casting defect detection and soldering, process postwelding stress-removal, final postwelding Stress;
Into stove:Casting is sent into heat-treatment furnace, AC is heated to the heating rate of 100 DEG C/h of <3+ (50~100) DEG C are protected The warm time calculates according to the thickest of casting, and 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+104 DEG C of * (%Si) of+44.7 DEG C of * (%Ni) * (%V)+ 31.5 DEG C of * (%Mo);
Wherein AC3It is different according to casting composition for austenitizing temperature, AC3It is calculated according to above-mentioned formula, so as to root Temperature is controlled according to the chemical composition of casting, is so more advantageous to the control to the performance of casting.
Quenching:Quenching liquid quenching is quickly entered after casting is come out of the stove, holding casting enters the temperature > 750 during quenching liquid DEG C, 40 DEG C of the temperature < of quenching liquid, hardening media uses concentration, and for 10%~12% PAG polymer, the cool time is according to casting The thickest of part calculates, and computational methods are multiplied by 2min/mm for thickest, to reduce the risk of casting deformation and cracking;
Tempering:Casting is fed again into heat-treatment furnace, with the heating rate of 70 DEG C/h of <, casting is heated to 720 ± 10 DEG C, heat preservation, then with the speed cooling down of 70 DEG C/h of <, be cooled to 260 DEG C of < come out of the stove it is air-cooled, tempering insulation time according to The thickest of casting calculates, and computational methods are multiplied by 2min/mm for thickest;
Casting defect detects and soldering:Defects detection, and soldering are carried out to casting;
Process postwelding stress-removal:Casting after soldering is come out of the stove carry out process high temperature stress-removal into heat, process high temperature disappears should The holding temperature of power is 680 ± 10 DEG C, and soaking time is calculated according to the thickest in the soldering area of casting, and computational methods are soldering The thickest in area is multiplied by 2min/mm, and then casting is cooled to 260 DEG C of < and is come out of the stove with the speed cooling down of 70 DEG C/h of < It is air-cooled;
Temperature, time calculate according to the thickest in soldering area when in this step to process high temperature stress-removal, because soldering There is the phenomenon that thicker than the thickest of casting or thin in the thickness in area, so this step is come according to the maximum gauge in soldering area Temperature and time is controlled, so that soldering area stress-removal is fully, thoroughly.
Final postwelding stress-removal:Casting after postwelding stress-removal step process during is come out of the stove progress again into heat Final high temperature stress-removal, 700 ± 5 DEG C of the holding temperature of final high temperature stress-removal, soaking time are calculated according to casting thickest, Computational methods are the thickest * 2min/mm of casting, and casting then is cooled to < with the speed cooling down of 70 DEG C/h of < 260 DEG C come out of the stove it is air-cooled.
This step is the final stress-removal to casting, so temperature and time is calculated according to casting thickest, and should 700 ± 5 DEG C of be more than process high temperature stress-removal 680 ± 10 DEG C of temperature can not only carry out thorough stress-removal to casting, moreover, Supplement stress-removal again has also been carried out for soldering area, soldering area is avoided to still have residual stress.
Further, the in-furnace temperature confonnality deviations of the heat-treatment furnace<10 DEG C, and casting is placed on the effective of heat-treatment furnace In heating zone, casting and surrounding burner hearth distance > 500mm avoid quirk.
Further, propped up also between the casting bottom and heat-treatment furnace and put parallels, height >=700mm of the parallels, Two laid parallel parallels spacing 500mm.To prevent casting hot-spot
Casting using above method production is sampled, and chemical composition detection and analysis are carried out to sample, is obtained Following table:
C, Si, Mn, P, S, Cr, Mo, Ni constituent content and other performance parameters in upper table be by chemical composition analysis, What detection obtained, and carbon equivalent Ceq is calculated according to the following formula:
Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15
It understanding, carbon equivalent is the comprehensive performance embodiment by multiple element, in table as can be seen that when carbon equivalent >=0.93, The various performance parameters of casting are excellent so that between high comprehensive performance.
The steps in the embodiment of the present invention can be sequentially adjusted, merged and deleted according to actual needs.
Module or unit in device of the embodiment of the present invention can be combined, divided and deleted according to actual needs.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly It encloses, one of ordinary skill in the art will appreciate that realize all or part of flow of above-described embodiment, and will according to right of the present invention Made equivalent variations are sought, still falls within and invents covered scope.

Claims (4)

1. a kind of production method of the large-scale steel-casting of G17CrMo9-10 materials, 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%, surplus is iron, and feature exists In:Including heat treatment process, the heat treatment process is included into stove, quenching, tempering, casting defect detection and soldering, process weldering Stress-removal, final postwelding stress-removal step afterwards;
Into stove:Casting is sent into heat-treatment furnace, AC3+ is heated to the heating rate of 100 DEG C/h of <(50~100)DEG C, during heat preservation Between calculated according to the thickest of casting, computational methods are multiplied by 1h/25mm, AC3 for thickest(℃)=910℃-203℃*(% C)1/2-15.2℃*(%Ni)+44.7℃*(%Si)+104℃*(%V)+
31.5℃*(%Mo);
Quenching:Quenching liquid quenching is quickly entered after casting is come out of the stove, holding casting enters 750 DEG C of temperature > during quenching liquid, quenches 40 DEG C of the temperature < of fiery liquid, hardening media use concentration for 10%~12% PAG polymer, the cool time according to casting maximum Wall thickness calculates, and computational methods are multiplied by 2min/mm for thickest, to reduce the risk of casting deformation and cracking;
Tempering:Casting is fed again into heat-treatment furnace, with the heating rate of 70 DEG C/h of <, casting is heated to 720 ± 10 DEG C, Heat preservation then with the speed cooling down of 70 DEG C/h of <, is cooled to 260 DEG C of < and comes out of the stove air-cooled, tempering insulation time is according to casting Thickest calculate, computational methods are multiplied by 2min/mm for thickest;
Casting defect detects and soldering:Defects detection, and soldering are carried out to casting;
Process postwelding stress-removal:Casting after soldering is subjected to process high temperature stress-removal, process high temperature stress-removal into heat-treatment furnace Holding temperature for 680 ± 10 DEG C, soaking time is calculated according to the thickest in the soldering area of casting, and computational methods are soldering The thickest in area is multiplied by 2min/mm, and then casting is cooled to 260 DEG C of < and is come out of the stove with the speed cooling down of 70 DEG C/h of < It is air-cooled;
Final postwelding stress-removal:Casting after postwelding stress-removal step process during is carried out most again into heat-treatment furnace Whole high temperature stress-removal, 700 ± 5 DEG C of the holding temperature of final high temperature stress-removal, soaking time are calculated according to casting thickest, Computational methods are the thickest * 2min/mm of casting, and casting then is cooled to < with the speed cooling down of 70 DEG C/h of < 260 DEG C come out of the stove it is air-cooled.
2. a kind of production method of the large-scale steel-casting of G17CrMo9-10 materials as described in claim 1, it is characterised in that: The in-furnace temperature confonnality deviations of the heat-treatment furnace<10℃.
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: Branch puts parallels, height >=700mm of the parallels also between the casting bottom and heat-treatment furnace.
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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
CN107604245B (en) * 2017-09-05 2019-05-17 共享铸钢有限公司 A kind of preparation method of heat-resisting CrMoV steel-casting and heat-resisting CrMoV cast steel material
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101397635A (en) * 2007-09-29 2009-04-01 宝山钢铁股份有限公司 12Cr2Mo1R thick steel plate for equipment contacting hydrogen and method for producing the same
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101397635A (en) * 2007-09-29 2009-04-01 宝山钢铁股份有限公司 12Cr2Mo1R thick steel plate for equipment contacting hydrogen and method for producing the same
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

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
舞钢超厚临氢Cr-Mo钢板的研发;吴艳阳等;《宽厚板》;20130630;第1-5页 *
铸钢件2.5Cr-1Mo系列材质化学成分与力学性能关系的探讨;谢永祥等;《中国铸造装备与技术》;20120630;第10-12页 *

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