CN107287497A - High-pearlite high-tenacity nodular cast iron and its process of surface treatment - Google Patents

High-pearlite high-tenacity nodular cast iron and its process of surface treatment Download PDF

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Publication number
CN107287497A
CN107287497A CN201710652148.7A CN201710652148A CN107287497A CN 107287497 A CN107287497 A CN 107287497A CN 201710652148 A CN201710652148 A CN 201710652148A CN 107287497 A CN107287497 A CN 107287497A
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iron
pearlite
treatment
cast iron
nodular cast
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CN201710652148.7A
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CN107287497B (en
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张立安
魏明军
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WANXIN CASTING CO Ltd MAANSHAN CITY
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WANXIN CASTING CO Ltd MAANSHAN CITY
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or 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
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • 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
    • 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
    • C21D5/00—Heat treatments of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • C22C37/08—Cast-iron alloys containing chromium with nickel
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
    • C23C8/30—Carbo-nitriding
    • C23C8/32—Carbo-nitriding of ferrous surfaces
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

The invention discloses high-pearlite high-tenacity nodular cast iron and its process of surface treatment, it is related to spheroidal graphite cast-iron technical field.Percentage by weight including each composition is as follows：C：3.3~3.4%, Si：2.1~2.6%, Mn：0.3~0.6%；Al：3.5~4.5%, Bi：1.5~2.5%, Mo：1.3~2.5%, Cu：0.4~0.8%, Cr：2.63~3.92%, Zr：0.63~0.92%, Ba：1.63~1.92%, Mg：0.06~0.09%, Ni：0.17~0.73%, V：0.032~0.081%, Zn：0.12~0.21%, As：0.012~0.021%, Re：0.03~0.05%, P ＜ 0.06, S ＜ 0.02, remaining is Fe.Nodular iron casting case hardness after treatment of the invention is up to 900HV, 2 grades of fragility.Cryogenic gas carbo-nitriding can equally significantly improve the hardness and wearability on nodular iron casting surface, and permeation temperature is generally 530~570 DEG C；Very high hardness is obtained on nodular iron casting surface and center portion still keeps certain toughness, with preferable comprehensive mechanical property.

Description

High-pearlite high-tenacity nodular cast iron and its process of surface treatment
Technical field
The invention belongs to spheroidal graphite cast-iron technical field, more particularly at high-pearlite high-tenacity nodular cast iron and its surface Science and engineering skill.
Background technology
Pearlite ductile iron (Pearlite heat-resisting steel) matrix medium pearlite account for 80% with On spheroidal graphite cast-iron (abbreviation magnesium iron).Tri- kinds of trade mark magnesium irons of QT600-2 in chinese national standard, QT700-2, QT800-2 belong to This type.This kind of magnesium iron is generally obtained using normalized treatment, it is also possible to is added alloying element and is coordinated technological measure to obtain.It is main It is used to manufacturing that desired strength to be higher, the part with certain fatigue strength and anti-wear performance, such as crankshaft of diesel engine, connecting rod.
Matrix medium pearlite accounts for more than 80% spheroidal graphite cast-iron (abbreviation magnesium iron).This kind of magnesium iron is generally using at normalizing Reason is obtained, it is also possible to is added alloying element and is coordinated technological measure to obtain.It is higher mainly for the manufacture of desired strength, with certain The part of fatigue strength and anti-wear performance, such as crankshaft of diesel engine, connecting rod.
Form and the gold matrix in the wrong of graphite have a great impact to its toughness.(1) influence of graphite form.In metal Under matrix acceptance condition, graphite form influences very big to Zhongchang rate and impact value, and flake graphite has seriously isolated Metal Substrate Body, its sharp corner stress concentration, therefore flake graphite cast iron are in fragility, and impact value is very low, and intensity is weakened severely；And spheroidal graphite is cast Iron is different, as long as collective organization is qualified, the more high then toughness of Oxygen potential is better.(2) influence of matrix.The collection of pearlitic ductile iron Body tissue is based on pearlite, and remaining is ferrite.Cementite and iron phosphide eutectic are adverse tissues, general control 3% and 1% with Under.Ferrite is higher containing scape, then toughness is better；Pearlite is higher containing scape, and intensity and hardness are higher.
The content of the invention
It is an object of the invention to provide high-pearlite high-tenacity nodular cast iron and its process of surface treatment, by Nodular iron casting case hardness is up to 900HV after reason, 2 grades of fragility, and cryogenic gas carbo-nitriding can equally significantly improve spheroidal graphite The hardness and wearability of Iron Casting Surface, permeation temperature are generally 530~570 DEG C；Obtain very high on nodular iron casting surface Hardness and center portion still keeps certain toughness, with preferable comprehensive mechanical property.
The present invention is achieved by the following technical solutions：
The present invention is high-pearlite high-tenacity nodular cast iron, and the percentage by weight of each composition is as follows：C：3.3~3.4%, Si：2.1~2.6%, Mn：0.3~0.6%；Al：3.5~4.5%, Bi：1.5~2.5%, Mo：1.3~2.5%, Cu：0.4 ~0.8%, Cr：2.63~3.92%, Zr：0.63~0.92%, Ba：1.63~1.92%, Mg：0.06~0.09%, Ni： 0.17~0.73%, V：0.032~0.081%, Zn：0.12~0.21%, As：0.012~0.021%, Re：0.03~ 0.05%, P ＜ 0.06, S ＜ 0.02, remaining is Fe.
The process of surface treatment of high-pearlite high-tenacity nodular cast iron, including following process：
SS01 spheroidal graphite cast-iron carries out stress relieving by annealing；
SS02 is completed after SS01 steps, carries out nitrogen-based gas tufftride and high-frequency quenching Compound Heat Treatment；
Gas soft nitriding technique is as follows：560 DEG C~580 DEG C for the treatment of temperature, processing time 1.8h~2.8h, gas is N2+ NH3+CO2；Cooling condition：Air cooling；
Quenching technology after gas soft nitriding：160 DEG C for the treatment of temperature~280 DEG C × 2.8h~3.8h；
Short time high-frequency quenching：Temperature is 960 DEG C~1080 DEG C, while carrying out nitrogen environment insulation 2.8h~3.8h.
The invention has the advantages that：
Nodular iron casting case hardness after treatment of the invention is up to 900HV, 2 grades of fragility.Cryogenic gas carbo-nitriding The hardness and wearability on nodular iron casting surface can be equally significantly improved, permeation temperature is generally 530~570 DEG C；In spheroidal graphite Iron Casting Surface obtains very high hardness and center portion still keeps certain toughness, with preferable comprehensive mechanical property.
Certainly, any product for implementing the present invention it is not absolutely required to while reaching all the above advantage.
Embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based in the present invention Embodiment, all other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all Belong to the scope of protection of the invention.
The present invention is high-pearlite high-tenacity nodular cast iron, including the percentage by weight of each composition is as follows：C：3.3~ 3.4%, Si：2.1~2.6%, Mn：0.3~0.6%；Al：3.5~4.5%, Bi：1.5~2.5%, Mo：1.3~2.5%, Cu：0.4~0.8%, Cr：2.63~3.92%, Zr：0.63~0.92%, Ba：1.63~1.92%, Mg：0.06~ 0.09%, Ni：0.17~0.73%, V：0.032~0.081%, Zn：0.12~0.21%, As：0.012~0.021%, Re： 0.03~0.05%, P ＜ 0.06, S ＜ 0.02, remaining is Fe.
The process of surface treatment of high-pearlite high-tenacity nodular cast iron, including following process：
SS01 spheroidal graphite cast-iron carries out stress relieving by annealing；
SS02 is completed after SS01 steps, carries out nitrogen-based gas tufftride and high-frequency quenching Compound Heat Treatment；
Gas soft nitriding technique is as follows：560 DEG C~580 DEG C for the treatment of temperature, processing time 1.8h~2.8h, gas is N2+ NH3+CO2；Cooling condition：Air cooling；
Quenching technology after gas soft nitriding：160 DEG C for the treatment of temperature~280 DEG C × 2.8h~3.8h；
Short time high-frequency quenching：Temperature is 960 DEG C~1080 DEG C, while carrying out nitrogen environment insulation 2.8h~3.8h.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means At least one implementation of the present invention is contained in reference to specific features, structure, material or the feature that the embodiment or example are described In example or example.In this manual, identical embodiment or example are not necessarily referring to the schematic representation of above-mentioned term. Moreover, specific features, structure, material or the feature of description can be closed in any one or more embodiments or example Suitable mode is combined.
Present invention disclosed above preferred embodiment is only intended to help and illustrates the present invention.Preferred embodiment is not detailed All details of narration, it is only described embodiment that the invention is not limited yet.Obviously, according to the content of this specification, It can make many modifications and variations.This specification is chosen and specifically describes these embodiments, is to preferably explain the present invention Principle and practical application so that skilled artisan can be best understood by and utilize the present invention.The present invention is only Limited by claims and its four corner and equivalent.

Claims (2)

1. high-pearlite high-tenacity nodular cast iron, it is characterised in that：The percentage by weight of each composition is as follows：
C：3.3~3.4%, Si：2.1~2.6%, Mn：0.3~0.6%；Al：3.5~4.5%, Bi：1.5~2.5%, Mo： 1.3~2.5%, Cu：0.4~0.8%, Cr：2.63~3.92%, Zr：0.63~0.92%, Ba：1.63~1.92%, Mg： 0.06~0.09%, Ni：0.17~0.73%, V：0.032~0.081%, Zn：0.12~0.21%, As：0.012~ 0.021%, Re：0.03~0.05%, P ＜ 0.06, S ＜ 0.02, remaining is Fe.
2. the process of surface treatment of high-pearlite high-tenacity nodular cast iron, it is characterised in that including following process：
SS01 spheroidal graphite cast-iron carries out stress relieving by annealing；
SS02 is completed after SS01 steps, carries out nitrogen-based gas tufftride and high-frequency quenching Compound Heat Treatment；
Gas soft nitriding technique is as follows：560 DEG C~580 DEG C for the treatment of temperature, processing time 1.8h~2.8h, gas is N2+NH3+ CO2；Cooling condition：Air cooling；
Quenching technology after gas soft nitriding：160 DEG C for the treatment of temperature~280 DEG C × 2.8h~3.8h；Short time high frequency is quenched Fire：Temperature is 960 DEG C~1080 DEG C, while carrying out nitrogen environment insulation 2.8h~3.8h.
CN201710652148.7A 2017-08-02 2017-08-02 High-pearlite high-tenacity nodular cast iron Active CN107287497B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107699820A (en) * 2017-10-31 2018-02-16 桂林加宏汽车修理有限公司 A kind of high wear-resistant steel alloy
CN109023033A (en) * 2018-07-26 2018-12-18 含山县兴达球墨铸铁厂 A kind of ball mill wear resisting cast ball
CN111304526A (en) * 2020-03-30 2020-06-19 河北领启机械设备有限公司 High-toughness wear-resistant impeller for slurry pump and production method thereof

Citations (8)

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US4548643A (en) * 1983-12-20 1985-10-22 Trw Inc. Corrosion resistant gray cast iron graphite flake alloys
CN1054801A (en) * 1991-04-01 1991-09-25 河北工学院 High-strength low-alloy white cast-iron grinding ball and manufacture method thereof
PL159644B1 (en) * 1989-01-26 1992-12-31 Medium -alloy chromium cast iron
CN1176315A (en) * 1996-07-25 1998-03-18 Ae格策有限公司 Iron casting alloy for producing piston ring of internal-combustion engine
CN101460641A (en) * 2006-06-08 2009-06-17 乔治费希尔铸铁有限责任公司 Cast iron alloy with good oxidation stability at high temperatures
CN102230150A (en) * 2011-06-23 2011-11-02 河南中原吉凯恩气缸套有限公司 Surface treatment process of cast iron cylinder jacket
CN102828104A (en) * 2012-09-24 2012-12-19 常熟市红洲模具有限公司 Cast iron glass mould
CN104498966A (en) * 2014-12-05 2015-04-08 衡阳风顺车桥有限公司 Process for tufftriding amino gas

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US4548643A (en) * 1983-12-20 1985-10-22 Trw Inc. Corrosion resistant gray cast iron graphite flake alloys
PL159644B1 (en) * 1989-01-26 1992-12-31 Medium -alloy chromium cast iron
CN1054801A (en) * 1991-04-01 1991-09-25 河北工学院 High-strength low-alloy white cast-iron grinding ball and manufacture method thereof
CN1176315A (en) * 1996-07-25 1998-03-18 Ae格策有限公司 Iron casting alloy for producing piston ring of internal-combustion engine
CN101460641A (en) * 2006-06-08 2009-06-17 乔治费希尔铸铁有限责任公司 Cast iron alloy with good oxidation stability at high temperatures
CN102230150A (en) * 2011-06-23 2011-11-02 河南中原吉凯恩气缸套有限公司 Surface treatment process of cast iron cylinder jacket
CN102828104A (en) * 2012-09-24 2012-12-19 常熟市红洲模具有限公司 Cast iron glass mould
CN104498966A (en) * 2014-12-05 2015-04-08 衡阳风顺车桥有限公司 Process for tufftriding amino gas

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107699820A (en) * 2017-10-31 2018-02-16 桂林加宏汽车修理有限公司 A kind of high wear-resistant steel alloy
CN109023033A (en) * 2018-07-26 2018-12-18 含山县兴达球墨铸铁厂 A kind of ball mill wear resisting cast ball
CN111304526A (en) * 2020-03-30 2020-06-19 河北领启机械设备有限公司 High-toughness wear-resistant impeller for slurry pump and production method thereof

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Denomination of invention: Method for obtaining high-pearlite high-tenacity nodular cast iron crankshaft

Effective date of registration: 20191224

Granted publication date: 20190129

Pledgee: China Co truction Bank Corp Ma'anshan branch

Pledgor: Wanxin Casting Co., Ltd., Maanshan City

Registration number: Y2019980001244