CN104745758A - Preparation method of gray iron casting - Google Patents

Preparation method of gray iron casting Download PDF

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Publication number
CN104745758A
CN104745758A CN201510141701.1A CN201510141701A CN104745758A CN 104745758 A CN104745758 A CN 104745758A CN 201510141701 A CN201510141701 A CN 201510141701A CN 104745758 A CN104745758 A CN 104745758A
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China
Prior art keywords
iron
casting
nucleating agent
foundry goods
composition
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Pending
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CN201510141701.1A
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Chinese (zh)
Inventor
任江波
王旭
李华
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NINGXIA ZHONGXIN MACHINERY EQUIPMENT CO Ltd
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NINGXIA ZHONGXIN MACHINERY EQUIPMENT CO Ltd
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Priority to CN201510141701.1A priority Critical patent/CN104745758A/en
Publication of CN104745758A publication Critical patent/CN104745758A/en
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    • 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

Abstract

The invention relates to a casting method, particularly a preparation method of a gray iron casting, which comprises the following steps: proportioning, smelting, inoculant adjustment, shape casting and ramoff treatment. The gray iron casting is prepared from 10-20% of pig iron, 35-45% of steel scrap, 0.6-0.8% of silicon iron, 1-1.3% of carburizing agent and the balance of returns. By reducing the addition amount of pig iron, increasing the proportion of steel scrap, adding the carburizing agent to supplement carbon content and adopting twice inoculation, the chemical components in the casting satisfy the requirements, thereby substituting the strength enhancement process by adding alloy and lowering the cost. The produced HT250 satisfies the national standard.

Description

The preparation method of gray iron casting
Technical field
The present invention relates to a kind of castmethod, be specifically related to a kind of preparation method of gray iron casting.
Background technology
The mechanical property of gray iron depends primarily on its matrix, considers from intensity, should avoid producing long and thin graphite flake and thick graphite flake.Controlling form and the distribution situation of graphite, is the key ensureing gray cast iron properties.Improving the most frequently used mode of strength of gray cast iron is adjustment chemical composition, namely reduces carbon equivalent, increases alloying element.The reduction of carbon equivalent can reduce the feeding effect that cast iron self graphite expansion brings, and increases the increase that alloy brings again casting cost, and alloying constituent fluctuates and brings unstable impact to cast properties etc.
Summary of the invention
Based on above deficiency, the present invention proposes a kind of preparation method of gray iron casting.
A preparation method for gray iron casting, comprises the following steps:
(1) prepare burden: calculate according to weight percent, proportioning raw materials is: the pig iron 10 ~ 20%, steel scrap 35 ~ 45%, ferrosilicon 0.6 ~ 0.8%, carburelant 1 ~ 1.3%, all the other foundry returns;
(2) melting: use intermediate frequency furnace melting, and detect base iron composition, by use test analytical instrument, base iron composition is measured, meet span of control: C:3.4 ~ 3.6%, Si:1.7 ~ 1.9%, Mn:0.7 ~ 1.0%, P≤0.1%, S:0.05 ~ 0.12%, Cu≤0.1%, Sn≤0.01%, all the other are iron;
(3) nucleating agent adjustment: add nucleating agent, FeSi75 selected by nucleating agent, granularity 3 ~ 8mm, total amount 0.6%, add at twice, first time before tapping a blast furnace, 0.2% nucleating agent is put into casting ladle, second time wait tap a blast furnace 1/3 time 0.4% nucleating agent is added in iron notch with molten iron persistence, speed control nucleating agent tapping a blast furnace complete while adds; After tapping a blast furnace, use test analytical instrument measures hot metal composition, and the composition of molten iron meets: C:3.2 ~ 3.6%, Si:2.0 ~ 2.2%, Mn:0.7 ~ 1.0%, P≤0.1%, S:0.05 ~ 0.12%, Cu≤0.1%, Sn≤0.007%, and all the other are iron;
(4) moulding cast: the mixed molding sand made is by molding machine extrusion moduling, the molding sand cavity that formation process requires, after base iron composition adjustment to claimed range, control tapping temperature is come out of the stove, reaching molten iron when cast requires until molten iron temperature pours in sand mold cavity, then naturally cooling solidifies, and forms foundry goods.
(5) peeling: enter sand shakeout system immediately after foundry goods cooled and solidified, make foundry goods and molding sand initial gross separation, obtain the foundry goods that surface is stained with a small amount of molding sand, foundry goods removes the molding sand of surface adhesion through ball blast, then remove dead head, namely the part polished off beyond cast shape requirement obtains foundry goods.
Preferably, in described batching step, proportioning raw materials is: the pig iron 15%, steel scrap 35%, ferrosilicon 0.7%, carburelant 1.1%, all the other foundry returns.
Preferably, in described batching step, proportioning raw materials is: the pig iron 20%, steel scrap 45%, ferrosilicon 0.8%, carburelant 1.3%, all the other foundry returns
The present invention is by reducing the add-on of the pig iron and increasing the ratio of steel scrap in batching, add carburelant simultaneously and supplement carbon content, adopt and breed for twice, chemical composition in foundry goods is met the demands, instead of the process improving intensity by adding alloy, reduce cost, and the HT250 produced is up to state standards.
Embodiment
A preparation method for gray iron casting, comprises the following steps:
(1) prepare burden: carry out raw material according to weight percent and make, the pig iron 10 ~ 20%, steel scrap 35 ~ 45%, ferrosilicon 0.6 ~ 0.8%, carburelant 1 ~ 1.3%, all the other foundry returns; In carburelant, carbon content is not less than 90%, the carbon content 4.2 ~ 4.3% of the pig iron, in steel scrap, carbon content is about 0.02%, increase the add-on of steel scrap, reducing pig iron usage quantity can make by the base iron composition carbon content after this proportioning melting not enough, increases carbon content in base iron by adding appropriate carburelant;
(2) melting: use intermediate frequency furnace melting, and detect base iron composition, by use test analytical instrument, base iron composition is measured, meet span of control: C:3.4 ~ 3.6%, Si:1.7 ~ 1.9%, Mn:0.7 ~ 1.0%, P≤0.1%, S:0.05 ~ 0.12%, Cu≤0.1%, Sn≤0.01%, all the other are iron;
(3) nucleating agent adjustment: add nucleating agent, FeSi75 selected by nucleating agent, granularity 3 ~ 8mm, total amount 0.6%, add at twice, 0.2% nucleating agent is put into casting ladle by first time before tapping a blast furnace, second time wait tap a blast furnace 1/3 time 0.4% nucleating agent is added in iron notch with molten iron persistence, speed control nucleating agent tapping a blast furnace complete while adds, increasing late inoculation can make fall time extend, improve graphite form, and nucleating agent is added in, and iron notch is interior to be flow in casting ladle with molten iron, nucleating agent fusing thoroughly, uniform composition, more be conducive to stably manufactured, after tapping a blast furnace, use test analytical instrument measures hot metal composition, the composition of molten iron meets: C:3.2 ~ 3.6%, Si:2.0 ~ 2.2%, Mn:0.7 ~ 1.0%, P≤0.1%, S:0.05 ~ 0.12%, Cu≤0.1%, Sn≤0.007%, all the other are iron,
(4) moulding cast: the mixed molding sand made is by molding machine extrusion moduling, the molding sand cavity that formation process requires, after base iron composition adjustment to claimed range, control tapping temperature is come out of the stove, reaching molten iron when cast requires until molten iron temperature pours in sand mold cavity, then naturally cooling solidifies, and forms foundry goods;
(5) peeling: enter sand shakeout system immediately after foundry goods cooled and solidified, make foundry goods and molding sand initial gross separation, obtain the foundry goods that surface is stained with a small amount of molding sand, foundry goods removes the molding sand of surface adhesion through ball blast, then remove dead head, namely the part polished off beyond cast shape requirement obtains foundry goods.
Embodiment 1, according to batching is: the pig iron 15%, steel scrap 35%, ferrosilicon 0.7%, carburelant 1.1%, all the other foundry returns configuration raw material carries out melting, after producing according to this preparation method, after nucleating agent breeds adjustment, detect hot metal composition is C:3.5%, Si:2.0%, Mn:0.9%, P:0.083%, S:0.07%, Cu:0.095%, Sn:0.006%, all the other are iron.
Embodiment 2, according to batching is: the pig iron 20%, steel scrap 45%, ferrosilicon 0.8%, carburelant 1.3%, all the other foundry returns configuration raw material carries out melting, after producing according to this preparation method, after nucleating agent breeds adjustment, detect hot metal composition is C:3.3%, Si:2.1%, Mn:0.8%, P:0.094%, S:0.11%, Cu:0.09%, Sn:0.006%, all the other are iron.

Claims (3)

1. a preparation method for gray iron casting, is characterized in that comprising the following steps:
(1) prepare burden: calculate according to weight percent, proportioning raw materials is, the pig iron 10 ~ 20%, steel scrap 35 ~ 45%, ferrosilicon 0.6 ~ 0.8%, carburelant 1 ~ 1.3%, all the other foundry returns;
(2) melting: use intermediate frequency furnace melting, and detect base iron composition, measured base iron composition by use test analytical instrument, base iron Chemical Composition span of control meets: C:3.4 ~ 3.6%, Si:1.7 ~ 1.9%, Mn:0.7 ~ 1.0%, P≤0.1%, S:0.05 ~ 0.12%, Cu≤0.1%, Sn≤0.01%, all the other are iron;
(3) nucleating agent adjustment: add nucleating agent, FeSi75 selected by nucleating agent, granularity 3 ~ 8mm, total amount 0.6%, add at twice, first time before tapping a blast furnace, 0.2% nucleating agent is put into casting ladle, second time wait tap a blast furnace 1/3 time 0.4% nucleating agent is added in iron notch with molten iron persistence, speed control nucleating agent tapping a blast furnace complete while adds; After tapping a blast furnace, use test analytical instrument measures hot metal composition, and the composition of molten iron meets: C:3.2 ~ 3.6%, Si:2.0 ~ 2.2%, Mn:0.7 ~ 1.0%, P≤0.1%, S:0.05 ~ 0.12%, Cu≤0.1%, Sn≤0.007%, and all the other are iron;
(4) moulding cast: the mixed molding sand made is by molding machine extrusion moduling, the molding sand cavity that formation process requires, after base iron composition adjustment to claimed range, control tapping temperature is come out of the stove, reaching molten iron when cast requires until molten iron temperature pours in sand mold cavity, then naturally cooling solidifies, and forms foundry goods.
(5) peeling: enter sand shakeout system immediately after foundry goods cooled and solidified, make foundry goods and molding sand initial gross separation, obtain the foundry goods that surface is stained with a small amount of molding sand, foundry goods removes the molding sand of surface adhesion through ball blast, then remove dead head, namely the part polished off beyond cast shape requirement obtains foundry goods.
2. the preparation method of gray iron casting as claimed in claim 1, is characterized in that: calculate according to weight percent, described batching step Raw proportioning is: the pig iron 15%, steel scrap 35%, ferrosilicon 0.7%, carburelant 1.1%, all the other foundry returns.
3. the preparation method of gray iron casting as claimed in claim 1, is characterized in that: calculate according to weight percent, described batching step Raw proportioning is: the pig iron 20%, steel scrap 45%, ferrosilicon 0.8%, carburelant 1.3%, all the other foundry returns.
CN201510141701.1A 2015-03-30 2015-03-30 Preparation method of gray iron casting Pending CN104745758A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105483505A (en) * 2015-12-11 2016-04-13 合肥工业大学 Preparation method of high-strength gray cast iron cast cylinder block
CN109136733A (en) * 2018-11-12 2019-01-04 吴江市鼎天铸造有限公司 Thick high trade mark gray iron casting production method in a kind of thin-walled band
CN113174528A (en) * 2021-04-26 2021-07-27 泛凯斯特汽车零部件(江苏)有限公司 Casting made of gray cast iron and manufacturing method thereof
CN113930660A (en) * 2021-08-30 2022-01-14 格力(武安)精密装备制造有限公司 Casting of food-grade cooker and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101649369A (en) * 2009-08-28 2010-02-17 河南省四达仙龙实业有限公司 Melting process for producing synthetic cast iron by utilizing SiC carburizing siliconizing
CN101818226A (en) * 2010-05-14 2010-09-01 贵州英吉尔机械制造有限公司 Charge composition of synthetic cast iron and method for preparing cylinder head castings
CN102912063A (en) * 2012-11-05 2013-02-06 青岛和德隆机械有限公司 Raw material composition of high-silicon cast iron liquid alkali valve cast and production method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101649369A (en) * 2009-08-28 2010-02-17 河南省四达仙龙实业有限公司 Melting process for producing synthetic cast iron by utilizing SiC carburizing siliconizing
CN101818226A (en) * 2010-05-14 2010-09-01 贵州英吉尔机械制造有限公司 Charge composition of synthetic cast iron and method for preparing cylinder head castings
CN102912063A (en) * 2012-11-05 2013-02-06 青岛和德隆机械有限公司 Raw material composition of high-silicon cast iron liquid alkali valve cast and production method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
刘瑞玲 等: "《铸造实用数据速查手册》", 31 May 2014, 机械工业出版社 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105483505A (en) * 2015-12-11 2016-04-13 合肥工业大学 Preparation method of high-strength gray cast iron cast cylinder block
CN109136733A (en) * 2018-11-12 2019-01-04 吴江市鼎天铸造有限公司 Thick high trade mark gray iron casting production method in a kind of thin-walled band
CN113174528A (en) * 2021-04-26 2021-07-27 泛凯斯特汽车零部件(江苏)有限公司 Casting made of gray cast iron and manufacturing method thereof
CN113930660A (en) * 2021-08-30 2022-01-14 格力(武安)精密装备制造有限公司 Casting of food-grade cooker and preparation method thereof

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Application publication date: 20150701