CN105525190A - Gray cast iron and manufacturing method thereof - Google Patents

Gray cast iron and manufacturing method thereof Download PDF

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Publication number
CN105525190A
CN105525190A CN201410509426.XA CN201410509426A CN105525190A CN 105525190 A CN105525190 A CN 105525190A CN 201410509426 A CN201410509426 A CN 201410509426A CN 105525190 A CN105525190 A CN 105525190A
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China
Prior art keywords
iron
cast iron
graphitic cast
manufacture method
gray cast
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Pending
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CN201410509426.XA
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Chinese (zh)
Inventor
孙士俊
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Tianjin Zhongda Precision Machinery Co Ltd
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Tianjin Zhongda Precision Machinery Co Ltd
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Priority to CN201410509426.XA priority Critical patent/CN105525190A/en
Publication of CN105525190A publication Critical patent/CN105525190A/en
Pending legal-status Critical Current

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Abstract

The invention provides gray cast iron. The gray cast iron is composed of 3.2-3.25% of C, 1.7-1.85% of Si, 0.7-0.85% of Mn, P smaller than or equal to 0.1%, S smaller than or equal to 0.1%, Ti smaller than 0.04%, 0.020-0.035% of Mg residues, 0.005-0.015% of Re residues and the balance Fe. The preparation process of the gray cast iron comprises the steps of carrying out matter inspection, sequentially feeding 45% of Q14 pig iron, 24% of steel scraps and 31% of foundry returns by weight for proportioning raw materials, then smelting, inoculatingand pouring the raw material, and carrying out aftertreatment such as heat treatment, shot blasting, polishing and machining for forming output products. The production process is simple, the energy consumption is obviously lowered, the gray cast iron can be produced in a batched mode, the strength and the rigidity are guaranteed, the production cost is lowered by reducing precious metal such as molybdenum, niobium and nickel added into molten iron in the smelting process, the shortcomings such as shrinkage cavities and shrinkage porosity are avoided, and the yield is high.

Description

A kind of graphitic cast iron and manufacture method thereof
Technical field
The invention belongs to casting technology field, especially relate to a kind of graphitic cast iron and manufacture method thereof.
Background technology
Cast iron refers to the iron-carbon of carbon content more than 2%.The general carbon content of industrial cast iron is 2% ~ 4%.Carbon exists mainly with graphite form in cast iron, sometimes also exists with cementite form.Outside de-carbon, the silicon also containing 1% ~ 3% in cast iron, and the element such as manganese, phosphorus, sulphur.Cast alloy iron is also containing elements such as nickel, chromium, molybdenum, aluminium, copper, boron, vanadium.Carbon, silicon are the principal elements affecting cast iron microstructure and performance.Cast iron can be divided into: grey cast iron, white cast iron, spheroidal graphite cast iron etc.It is by foundry iron (part conversion pig) (cupola furnace or circuit) refuse in stove, and adds iron alloy (nucleating agent such as ferro-silicon), steel scrap, foundry return adjusting component and obtain.
The carbon content of grey cast iron is higher (2.7% ~ 4.0%), and carbon mainly exists with free state flake graphite form, fracture gray, is called for short gray iron.Fusing point low (1145 ~ 1250 DEG C), when solidifying, shrinkage is little, and ultimate compression strength and hardness are close to carbon steel, and damping property is good.Its main component is iron, carbon, silicon, manganese, sulphur, phosphorus, and be most widely used cast iron, its output accounts for cast iron ultimate production more than 80%.Its intensity, wear resistance, thermotolerance are all better, and well damping, castability is more excellent, can be used for the pump case of requirement high strength and certain anti-corrosion capability, container, tower, flange, stuffing box body and gland, carbonating tower, nitrated tower etc.; Also can make bed piece, column, cylinder, gear and need through hard-faced part.
Common grey iron casting is all purchase V-block as starting material, needs to spend substantial contribution; Increase various chemical additive, allocation process is complicated, adds labour intensity and the production cost of workman.Along with the development of automobile, lathe and construction machinery industry foundry engieering, high, that reliability the is stable foundry goods of casting intensity has become the trend of current casting industry development.But how obtaining more stable, reliable high trade mark graphitic cast iron is the road that a lot of foundry enterprise is sought.The main flow that strength of gray cast iron has more and more become current Foundry Production is improved by adding the precious metals such as molybdenum, niobium, nickel in cast iron melting.But add these precious metals and bring very high cost pressure to manufacturer on the one hand, also can produce the defects such as shrinkage cavity and porosity after adding these compositions on the other hand.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of graphitic cast iron and manufacture method thereof, and technique is simple, while the grey casting strength of guarantee and hardness, effectively reduces cost, and improves the stability of the chemical composition of graphitic cast iron.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of graphitic cast iron, its chemical composition is: C3.2 ~ 3.25%, Si1.7 ~ 1.85%, Mn0.7 ~ 0.85%, P≤0.1%, S≤0.1%, Ti < 0.04%, Mg residual 0.020 ~ 0.035%, Re residual 0.005 ~ 0.015%, all the other are Fe.
Its preparation process comprises the steps:
1. the inspection of raw and process materials: the content detecting C, Si, Mn, S, P in starting material;
2. the proportioning of raw material: by the starting material be up to the standards, feed intake the Q14 pig iron 45% by weight percentage successively, steel scrap 24%, and foundry returns 31% carries out proportioning;
3. melt iron: the heating raw materials good by proportioning, makes it to become the molten iron of 1480 DEG C ~ 1560 DEG C and melting;
4. breed: to add in melted molten iron nucleating agent wrap in breed, and add the ferrochrome breeding molten iron total amount 0.2% ~ 0.24%; ;
5. pour into a mould: in the moulding of Iron Mould Coated Sand, pouring molten iron temperature controls at 1380 DEG C ~ 1420 DEG C, and will be poured in 8 minutes, then naturally cooling 10 ~ 12 hours;
6. aftertreatment: unpacked by casting mold, take out gray iron casting cleaning, then carried out temper, soaking time 3 ~ 5 hours, naturally cooling after tempering, then carries out ball blast and polishing successively, carries out machining after being up to the standards.
Further, described nucleating agent FeSi75, when breeding, nucleating agent adds that weight percentage content is melting total amount 0.35% ~ 0.45%.
Further, described step 3. melt iron time, get test block and carry out carbon content detection, if carbon content is less than set quota, then add carburelant; If carbon content is greater than set quota, then add steel scrap again.
Further, described carburelant is graphite carburelant.
Further, described gray iron foundry returns is adopt gray iron 250 or gray iron 200 or the mixture of the two.
The advantage that the present invention has and positively effect are:
1) technique is simple, produces and implements conveniently, to enhance productivity, be applicable to produce in enormous quantities.
2) while the grey casting strength of guarantee and hardness, effectively reduce cost, and improve the stability of the chemical composition of graphitic cast iron.
3) casting flaw of the foundry goods of this processing method production reduces, and good article rate improves, and the present invention produces product properties all higher than national standard, homogeneous microstructure.
4) by the interpolation of carburelant and steel scrap, ensure that the carbon content of molten iron, be simple and easy to implement, controllability is good.
Embodiment
Below specific embodiments of the invention are elaborated.
Embodiment 1
A kind of graphitic cast iron, its chemical composition is: C3.2%, Si1.75%, Mn0.7%, P≤0.1%, S≤0.1%, Ti < 0.04%, Mg residual 0.020 ~ 0.035%, Re residual 0.005 ~ 0.015%, all the other are Fe.
Embodiment 2
A kind of graphitic cast iron, its chemical composition is: C3.22%, Si1.8%, Mn0.8%, P≤0.1%, S≤0.1%, Ti < 0.04%, Mg residual 0.020 ~ 0.035%, Re residual 0.005 ~ 0.015%, all the other are Fe.
Embodiment 3
A kind of graphitic cast iron, its chemical composition is: C3.24%, Si1.85%, Mn0.84%, P≤0.1%, S≤0.1%, Ti < 0.04%, Mg residual 0.020 ~ 0.035%, Re residual 0.005 ~ 0.015%, all the other are Fe.
In above embodiment, the preparation process of graphitic cast iron comprises the steps:
1. the inspection of raw and process materials: the content detecting C, Si, Mn, S, P in starting material;
2. the proportioning of raw material: by the starting material be up to the standards, feed intake the Q14 pig iron 45% by weight percentage successively, steel scrap 24%, and foundry returns 31% carries out proportioning;
3. melt iron: the heating raw materials good by proportioning, makes it to become the molten iron of 1480 DEG C ~ 1560 DEG C and melting;
4. breed: to add in melted molten iron nucleating agent wrap in breed, and add the ferrochrome breeding molten iron total amount 0.2% ~ 0.24%;
5. pour into a mould: in the moulding of Iron Mould Coated Sand, pouring molten iron temperature controls at 1380 DEG C ~ 1420 DEG C, and will be poured in 8 minutes, then naturally cooling 10 ~ 12 hours;
6. aftertreatment: unpacked by casting mold, take out gray iron casting cleaning, then carried out temper, soaking time 3 ~ 5 hours, naturally cooling after tempering, then carries out ball blast and polishing successively, carries out machining after being up to the standards.
Wherein, described nucleating agent FeSi75, when breeding, nucleating agent adds that weight percentage content is melting total amount 0.35% ~ 0.45%.
It should be noted that, for ease of machining, in actually operating, while proof strength, silicone content 1.8% is advisable.
Wherein, described step 3. melt iron time, get test block and carry out carbon content detection, if carbon content is less than set quota, then add carburelant; If carbon content is greater than set quota, then add steel scrap again.
Wherein, described carburelant is graphite carburelant.
Wherein, described foundry returns is adopt gray iron 250 or gray iron 200 or the mixture of the two.
Carburelant is steel-making, the conventional raw material of casting, the present invention uses that fixed carbon content is high, sulphur and the few graphite carburelant of ash oontent, as can the graphite carburelant produced of the remarkable graphite company limited of choice for use commercial type, the trade mark is 9012S, granularity is 0.6 ~ 4.75mm, and product specification is as following table:
It should be noted that, breed absorption 80% pregnant amount and account for iron water amount 0.35-0.45%.
The graphitic cast iron specific performance index that the various embodiments described above obtain is as following table:
By actual measurement, in stove, silicon increases 2% ~ 8%, manganese scaling loss 5% ~ 10%.
Technique of the present invention is simple, and it is convenient to implement, and casting strength is high, reliability is stable.By the interpolation of carburelant and steel scrap, ensure that the carbon content of molten iron, be simple and easy to implement, controllability is good, while proof strength and hardness, in cast iron melting, add the precious metals such as molybdenum, niobium, nickel by minimizing and reduce production cost, turn avoid defects such as producing shrinkage cavity and porosity, good article rate is high.
Above one embodiment of the present of invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.

Claims (6)

1. a graphitic cast iron, it is characterized in that: the chemical composition of described graphitic cast iron is: C3.2 ~ 3.25%, Si1.7 ~ 1.85%, Mn0.7 ~ 0.85%, P≤0.1%, S≤0.1%, Ti < 0.04%, Mg residual 0.020 ~ 0.035%, Re residual 0.005 ~ 0.015%, all the other are Fe.
2. a manufacture method for graphitic cast iron described in claim 1, is characterized in that: its preparation process comprises the steps:
1. the inspection of raw and process materials: the content detecting C, Si, Mn, S, P in starting material;
2. the proportioning of raw material: by the starting material be up to the standards, feed intake the Q14 pig iron 45% by weight percentage successively, steel scrap 24%, and foundry returns 31% carries out proportioning;
3. melt iron: the heating raw materials good by proportioning, makes it to become the molten iron of 1480 DEG C ~ 1560 DEG C and melting;
4. breed: to add in melted molten iron nucleating agent wrap in breed, and add the ferrochrome breeding molten iron total amount 0.2% ~ 0.24%;
5. pour into a mould: in the moulding of Iron Mould Coated Sand, pouring molten iron temperature controls at 1380 DEG C ~ 1420 DEG C, and will be poured in 8 minutes, then naturally cooling 10 ~ 12 hours;
6. aftertreatment: unpacked by casting mold, take out gray iron casting cleaning, then carried out temper, soaking time 3 ~ 5 hours, naturally cooling after tempering, then carries out ball blast and polishing successively, carries out machining after being up to the standards.
3. the manufacture method of graphitic cast iron according to claim 2, is characterized in that: described nucleating agent FeSi75, when breeding, nucleating agent adds that weight percentage content is melting total amount 0.35% ~ 0.45%.
4. the manufacture method of graphitic cast iron according to claim 2, is characterized in that: described step 3. melt iron time, get test block and carry out carbon content detection, if carbon content is less than set quota, then add carburelant; If carbon content is greater than set quota, then add steel scrap again.
5. the manufacture method of graphitic cast iron according to claim 5, is characterized in that: described carburelant is graphite carburelant.
6. the manufacture method of graphitic cast iron according to claim 2, is characterized in that: described foundry returns is adopt gray iron 250 or gray iron 200 or the mixture of the two.
CN201410509426.XA 2014-09-28 2014-09-28 Gray cast iron and manufacturing method thereof Pending CN105525190A (en)

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Application Number Priority Date Filing Date Title
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106566979A (en) * 2016-10-31 2017-04-19 广西大学 Heat treatment method of titanium-containing wear resisting cast iron
CN108941483A (en) * 2018-08-23 2018-12-07 江苏华太电力仪表有限公司 A kind of high-strength alloy gray cast iron valve body manufacturing process
CN109266953A (en) * 2018-10-30 2019-01-25 湖南红宇耐磨新材料股份有限公司 A kind of low manganese antifriction cast iron abrading-ball or mill section and preparation method thereof
CN109837453A (en) * 2019-04-16 2019-06-04 郑州大学 A kind of production method of the workbench of planer
CN110373601A (en) * 2019-07-10 2019-10-25 广西大学 A kind of preparation method of the material suitable for diesel engine cylinder cover
CN110408838A (en) * 2019-07-10 2019-11-05 广西大学 A kind of casting method of the gray cast iron suitable for engine cylinder body
CN114672719A (en) * 2022-04-13 2022-06-28 宜宾普什联动科技有限公司 Preparation method for high-strength thin-wall gray cast iron containing A-type graphite and gray cast iron
CN115415505A (en) * 2022-08-30 2022-12-02 南京钢铁股份有限公司 Casting process of cast iron cooling bottom plate

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106566979A (en) * 2016-10-31 2017-04-19 广西大学 Heat treatment method of titanium-containing wear resisting cast iron
CN108941483A (en) * 2018-08-23 2018-12-07 江苏华太电力仪表有限公司 A kind of high-strength alloy gray cast iron valve body manufacturing process
CN109266953A (en) * 2018-10-30 2019-01-25 湖南红宇耐磨新材料股份有限公司 A kind of low manganese antifriction cast iron abrading-ball or mill section and preparation method thereof
CN109837453A (en) * 2019-04-16 2019-06-04 郑州大学 A kind of production method of the workbench of planer
CN109837453B (en) * 2019-04-16 2020-05-22 郑州大学 Manufacturing method of working platform of planer
CN110373601A (en) * 2019-07-10 2019-10-25 广西大学 A kind of preparation method of the material suitable for diesel engine cylinder cover
CN110408838A (en) * 2019-07-10 2019-11-05 广西大学 A kind of casting method of the gray cast iron suitable for engine cylinder body
CN114672719A (en) * 2022-04-13 2022-06-28 宜宾普什联动科技有限公司 Preparation method for high-strength thin-wall gray cast iron containing A-type graphite and gray cast iron
CN115415505A (en) * 2022-08-30 2022-12-02 南京钢铁股份有限公司 Casting process of cast iron cooling bottom plate
CN115415505B (en) * 2022-08-30 2024-01-09 南京钢铁股份有限公司 Casting process of cast iron cooling bottom plate

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Application publication date: 20160427

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