CN106521304A - Heat treatment method for chromium molybdenum copper wear resisting cast iron - Google Patents

Heat treatment method for chromium molybdenum copper wear resisting cast iron Download PDF

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Publication number
CN106521304A
CN106521304A CN201610952296.6A CN201610952296A CN106521304A CN 106521304 A CN106521304 A CN 106521304A CN 201610952296 A CN201610952296 A CN 201610952296A CN 106521304 A CN106521304 A CN 106521304A
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Prior art keywords
iron
cast iron
chromium molybdenum
molybdenum copper
heat treatment
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CN201610952296.6A
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Chinese (zh)
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周炳振
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Guangxi University
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Guangxi University
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Priority to CN201610952296.6A priority Critical patent/CN106521304A/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/10Cast-iron alloys containing aluminium or 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
    • C21D1/26Methods of annealing
    • 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
    • C21D5/00Heat treatments of cast-iron
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/08Making cast-iron alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/06Cast-iron alloys containing chromium
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

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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)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The invention discloses a heat treatment method for chromium molybdenum copper wear resisting cast iron. The chromium molybdenum copper wear resisting cast iron comprises, by weight, 2.8-3.8% of C, 1.65-2.7% of Si, 0.5-1.2% of Mn, 0.12-0.7% of P, 0.2-0.5% of Cr, 0.3-0.8% of Mo, 0.55-1.4% of Cu, 0.09% of S or the less and the balance Fe. The heat treatment method comprises the following steps of burdening, preheating, smelting, on-the-spot quick analysis, final deoxidation, inoculation treatment, pouring and high temperature annealing. The method is easy, the structure is remarkably refined, the comprehensive performance such as mechanical strength, wear resistance and heat resistance is improved, the mechanical performance can reach to HT250 grade, the mechanical performance and the cutting machining performance are improved, and the method is particularly suitable for casting an air cylinder, a piston ring and a tappet.

Description

A kind of heat treatment method of chromium molybdenum copper wear resistant cast iron
Technical field
The present invention relates to the production technical field of ferrous metal, especially a kind of heat treatment side of chromium molybdenum copper wear resistant cast iron Method.
Background technology
Chromium molybdenum copper wear resistant cast iron is a kind of antifriction material of function admirable, and it has very high hardness and extends making for foundry goods The characteristics of using the life-span.During as anti-attrition cast iron, general chrome content is below 0.5%, it is to avoid free carbide occur, and often with Copper, molybdenum compound use.Molybdenum can reduce sensitivity profile, make the microstructure homogenization of different section, keep high intensity containing molybdenum cast iron It is same with high rigidity, still with preferable toughness and cutting additivity.The work of copper is to reduce the sensitiveness to section, changes pearly-lustre Body and improve graphite form.In addition to eliminating free cementite, hardness is reduced, improves mechanical performance and machinability, The high temperature anneal need to be carried out.
The content of the invention
The technical problem solved needed for of the invention is to provide a kind of heat treatment method of chromium molybdenum copper wear resistant cast iron.By control The addition of Chromium in Chromium Cast Iron, molybdenum and copper, casting out wear resistant cast iron, and carry out high annealing improves mechanical performance and machinability Energy.
The technical solution adopted for the present invention to solve the technical problems is:Including following several steps:
The first step:Dispensing:By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon press C2.8~3.8%, Si1.65~2.7%, Mn0.5~ 1.2%th, P0.12~0.7%, Cr0.2~0.5%, Mo0.3~0.8%, Cu0.55~1.4%, S≤0.09%, balance of Fe weight hundred The mode of ratio is divided to carry out dispensing;
Second step:Preheating:By optimization calculate steel scrap, foundry returns, the pig iron input intermediate frequency furnace in preheated;
3rd step:Melting:After by the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, put into its quantity for furnace charge 17~ 26%, composition carries out pre-deoxidation for the deoxidier of lime 70%+ fluorites 30%, then puts into ferromanganese that baking processes and ferrosilicon obtains iron Liquid;
4th step:Both analysis:Take iron liquid casting sample quickly to be analyzed, chemical composition is adjusted according to analysis result;
5th step:Final deoxidizing:Bonded hard ferrite magnet is warming up to into 1470~1640 DEG C, the aluminium that its quantity is iron liquid 0.1~0.3% is put into Carry out final deoxidizing;
6th step:Inoculation:Iron liquid carries out inoculation when flowing to casting ladle from intermediate frequency furnace, adds its quantity to be iron liquid amount 0.3~0.5% inovulant, the granularity of inovulant is 2~6mm, and inovulant is 75 ferrosilicon;
7th step:Cast:When bonded hard ferrite magnet is down to 1410~1460 DEG C, is poured into a mould, obtained foundry goods;
8th step:High annealing.
In the 8th described step high annealing, load in heat-treatment furnace, with the speed of 75~100 DEG C/h below 200 DEG C of foundry goods Degree is warming up to 770~830 DEG C, and 2~3h is when carrying out being quickly cooled to 580 DEG C for insulation, then foundry goods is put into into heat-treatment furnace with 50~ The speed of 90 DEG C/h is cooled to less than 300 DEG C air coolings of coming out of the stove, and obtains chromium molybdenum copper wear resistant cast iron.
The invention has the beneficial effects as follows:Method is simple, notableization tissue, puies forward mechanical strength, wear-resisting, heat-resisting etc. comprehensive Performance, its mechanical performance is up to the HT250 trades mark, while improve mechanical performance and machinability, be particularly suitable for casting cylinder, Piston ring and tappet.
Specific embodiment
Embodiment 1:
A kind of heat treatment method of chromium molybdenum copper wear resistant cast iron of this example, including following several steps:
The first step:Dispensing:By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon press C2.8%, Si1.65%, Mn0.5%, P0.12%, Cr0.2%, Mo0.3%, Cu0.55%, S≤0.09%, the mode of balance of Fe percentage by weights carries out dispensing;
Second step:Preheating:By optimization calculate steel scrap, foundry returns, the pig iron input intermediate frequency furnace in preheated;
3rd step:Melting:After by the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, it is furnace charge 17% to put into its quantity, into The deoxidier for being divided into lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese that baking processes and ferrosilicon obtains iron liquid;
4th step:Both analysis:Take iron liquid casting sample quickly to be analyzed, chemical composition is adjusted according to analysis result;
5th step:Final deoxidizing:Bonded hard ferrite magnet is warming up to into 1470 DEG C, putting into the aluminium that its quantity is iron liquid 0.1% carries out final deoxidizing;
6th step:Inoculation:Iron liquid carries out inoculation when flowing to casting ladle from intermediate frequency furnace, adds its quantity to be iron liquid amount 0.3% inovulant, the granularity of inovulant is 2mm, and inovulant is 75 ferrosilicon;
7th step:Cast:When bonded hard ferrite magnet is down to 1410 DEG C, is poured into a mould, obtained foundry goods;
8th step:High annealing:Load in heat-treatment furnace below 200 DEG C of foundry goods, 770 DEG C are warming up to the speed of 75 DEG C/h, protect When warm 2h carries out being quickly cooled to 580 DEG C, then foundry goods is put into into heat-treatment furnace it is cooled to less than 300 DEG C with the speed of 50 DEG C/h and come out of the stove Air cooling, obtains chromium molybdenum copper wear resistant cast iron.
Embodiment 2:
A kind of heat treatment method of chromium molybdenum copper wear resistant cast iron of this example, including following several steps:
The first step:Dispensing:By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon press C3.3%, Si2.175%, Mn0.85%, P0.41%, Cr0.35%, Mo0.55%, Cu0.975%, S≤0.09%, the mode of balance of Fe percentage by weights carries out dispensing;
Second step:Preheating:By optimization calculate steel scrap, foundry returns, the pig iron input intermediate frequency furnace in preheated;
3rd step:Melting:After by the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, it is furnace charge 21% to put into its quantity, into The deoxidier for being divided into lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese that baking processes and ferrosilicon obtains iron liquid;
4th step:Both analysis:Take iron liquid casting sample quickly to be analyzed, chemical composition is adjusted according to analysis result;
5th step:Final deoxidizing:Bonded hard ferrite magnet is warming up to into 1495 DEG C, putting into the aluminium that its quantity is iron liquid 0.2% carries out final deoxidizing;
6th step:Inoculation:Iron liquid carries out inoculation when flowing to casting ladle from intermediate frequency furnace, adds its quantity to be iron liquid amount 0.4% inovulant, the granularity of inovulant is 4mm, and inovulant is 75 ferrosilicon;
7th step:Cast:When bonded hard ferrite magnet is down to 1435 DEG C, is poured into a mould, obtained foundry goods;
8th step:High annealing:Load in heat-treatment furnace below 200 DEG C of foundry goods, 800 DEG C are warming up to the speed of 87 DEG C/h, protect When warm 2.5h carries out being quickly cooled to 580 DEG C, then foundry goods is put into heat-treatment furnace it is cooled to less than 300 DEG C with the speed of 70 DEG C/h Stove air cooling, obtains chromium molybdenum copper wear resistant cast iron.
Embodiment 3:
A kind of heat treatment method of chromium molybdenum copper wear resistant cast iron of this example, including following several steps:
The first step:Dispensing:By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon press C3.8%, Si2.7%, Mn1.2%, P0.7%, Cr0.5%, Mo0.8%, Cu1.4%, S≤0.09%, the mode of balance of Fe percentage by weights carries out dispensing;
Second step:Preheating:By optimization calculate steel scrap, foundry returns, the pig iron input intermediate frequency furnace in preheated;
3rd step:Melting:After by the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, it is furnace charge 26% to put into its quantity, into The deoxidier for being divided into lime 70%+ fluorites 30% carries out pre-deoxidation, then puts into ferromanganese that baking processes and ferrosilicon obtains iron liquid;
4th step:Both analysis:Take iron liquid casting sample quickly to be analyzed, chemical composition is adjusted according to analysis result;
5th step:Final deoxidizing:Bonded hard ferrite magnet is warming up to into 1640 DEG C, putting into the aluminium that its quantity is iron liquid 0.3% carries out final deoxidizing;
6th step:Inoculation:Iron liquid carries out inoculation when flowing to casting ladle from intermediate frequency furnace, adds its quantity to be iron liquid amount 0.5% inovulant, the granularity of inovulant is 6mm, and inovulant is 75 ferrosilicon;
7th step:Cast:When bonded hard ferrite magnet is down to 1460 DEG C, is poured into a mould, obtained foundry goods;
8th step:High annealing:Load in heat-treatment furnace below 200 DEG C of foundry goods, 830 DEG C are warming up to the speed of 100 DEG C/h, 3h is when carrying out being quickly cooled to 580 DEG C for insulation, then foundry goods is put into heat-treatment furnace is cooled to less than 300 DEG C with the speed of 90 DEG C/h Stove air cooling, obtains chromium molybdenum copper wear resistant cast iron.
Above the specific embodiment of the present invention is described, but these explanations can not be considered as limiting the present invention Scope, protection scope of the present invention limited by appended claims, where appointing on the basis of the claims in the present invention What modification, equivalent and improvement etc., each fall within protection scope of the present invention it.

Claims (2)

1. a kind of heat treatment method of chromium molybdenum copper wear resistant cast iron, it is characterised in that:Including following several steps:
The first step:Dispensing:By steel scrap, foundry returns, the pig iron, ferromanganese, ferrosilicon press C2.8~3.8%, Si1.65~2.7%, Mn0.5~ 1.2%th, P0.12~0.7%, Cr0.2~0.5%, Mo0.3~0.8%, Cu0.55~1.4%, S≤0.09%, balance of Fe weight hundred The mode of ratio is divided to carry out dispensing;
Second step:Preheating:By optimization calculate steel scrap, foundry returns, the pig iron input intermediate frequency furnace in preheated;
3rd step:Melting:After by the steel scrap in intermediate frequency furnace, foundry returns, pig iron fusing, put into its quantity for furnace charge 17~ 26%, composition carries out pre-deoxidation for the deoxidier of lime 70%+ fluorites 30%, then puts into ferromanganese that baking processes and ferrosilicon obtains iron Liquid;
4th step:Both analysis:Take iron liquid casting sample quickly to be analyzed, chemical composition is adjusted according to analysis result;
5th step:Final deoxidizing:Bonded hard ferrite magnet is warming up to into 1470~1640 DEG C, the aluminium that its quantity is iron liquid 0.1~0.3% is put into Carry out final deoxidizing;
6th step:Inoculation:Iron liquid carries out inoculation when flowing to casting ladle from intermediate frequency furnace, adds its quantity to be iron liquid amount 0.3~0.5% inovulant, the granularity of inovulant is 2~6mm, and inovulant is 75 ferrosilicon;
7th step:Cast:When bonded hard ferrite magnet is down to 1410~1460 DEG C, is poured into a mould, obtained foundry goods;
8th step:High annealing.
2. the heat treatment method of a kind of chromium molybdenum copper wear resistant cast iron according to claim 1, it is characterised in that:Described In eight step high annealings, load in heat-treatment furnace below 200 DEG C of foundry goods, 770~830 are warming up to the speed of 75~100 DEG C/h DEG C, 2~3h is when carrying out being quickly cooled to 580 DEG C for insulation, then foundry goods is put into heat-treatment furnace is cooled to the speed of 50~90 DEG C/h Less than 300 DEG C air coolings of coming out of the stove, obtain chromium molybdenum copper wear resistant cast iron.
CN201610952296.6A 2016-11-03 2016-11-03 Heat treatment method for chromium molybdenum copper wear resisting cast iron Pending CN106521304A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108754341A (en) * 2018-06-13 2018-11-06 中原内配集团安徽有限责任公司 A kind of cylinder jacket based on chrome molybdenum copper alloy
CN109182889A (en) * 2018-07-30 2019-01-11 天津立林钻头有限公司 Novel anti-attrition, wear resistant cast iron and preparation method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102260817A (en) * 2011-07-21 2011-11-30 芜湖市金贸流体科技股份有限公司 Cast iron with high strength, high temperature resistance and corrosion resistance and method for preparing same
CN103667858A (en) * 2012-09-06 2014-03-26 天津仁博铸件有限公司 Production method of ultralow-temperature spheroidal graphite cast iron

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102260817A (en) * 2011-07-21 2011-11-30 芜湖市金贸流体科技股份有限公司 Cast iron with high strength, high temperature resistance and corrosion resistance and method for preparing same
CN103667858A (en) * 2012-09-06 2014-03-26 天津仁博铸件有限公司 Production method of ultralow-temperature spheroidal graphite cast iron

Non-Patent Citations (1)

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王有超等: "铬钼铜合金灰铸铁气缸套的铸造工艺及力学性能研究", 《热加工工艺》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108754341A (en) * 2018-06-13 2018-11-06 中原内配集团安徽有限责任公司 A kind of cylinder jacket based on chrome molybdenum copper alloy
CN109182889A (en) * 2018-07-30 2019-01-11 天津立林钻头有限公司 Novel anti-attrition, wear resistant cast iron and preparation method thereof

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Application publication date: 20170322