CN102071372B - Heat-resisting white cast iron material and preparation method thereof - Google Patents
Heat-resisting white cast iron material and preparation method thereof Download PDFInfo
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- CN102071372B CN102071372B CN2011100074800A CN201110007480A CN102071372B CN 102071372 B CN102071372 B CN 102071372B CN 2011100074800 A CN2011100074800 A CN 2011100074800A CN 201110007480 A CN201110007480 A CN 201110007480A CN 102071372 B CN102071372 B CN 102071372B
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Abstract
The invention provides a heat-resisting white cast iron material and a preparation method thereof. The material has good performance, and the preparation method for the material is simple in process and low in production cost, and is suitable for industrial production. The heat-resisting white cast iron material takes white cast iron as a matrix; a metal wire group formed by iron wires and high carbon steel wires is distributed in the matrix; both the diameter of the used iron wires and the diameter of the used high carbon steel wires are 1 to 2 millimeters; the material contains 5 to 40 volume percent of the iron wires and the high carbon steel wires; and the diameter of the metal wire group is 10 to 15 centimeters.
Description
Technical field
The invention belongs to metal material field, relate to a kind of heat-resisting White Cast Iron Material and preparation method thereof.
Background technology
In metal material field, heat resisting iron receives generally as the low-cost heat-resisting material always and paying attention to.Apply for the plain body heat resisting iron of high silicon iron that a kind of hot strength and oxidation-resistance are improved for CN200610163305.X number, comprising: the Cr of the Mo of the Mn of the C of 2.5-3.8wt%, the Si of 5.0-7.0wt%, 0.2-0.8wt%, 0.05wt% or P still less, 0.02wt% or S still less, 0.5-1.2wt%, 0.1wt% or Cr still less, 0.5wt% or V still less, 0.01-0.1wt%, 0.05wt% or Sb still less and surplus Fe.
Although this cast iron has used many rare your elements such as Mo, Cr, V etc., used a large amount of silicon simultaneously, the toughness of material and tensile strength have all received very big restriction.
Summary of the invention
The object of the invention is exactly to above-mentioned technological deficiency, and a kind of heat-resisting White Cast Iron Material is provided, and this material has good performance.
Another object of the present invention provides the preparation method of above-mentioned heat-resisting White Cast Iron Material, and this preparing method's technology is simple, and production cost is low, is suitable for suitability for industrialized production.
The objective of the invention is to realize through following technical scheme:
A kind of heat-resisting White Cast Iron Material; It is characterized in that: this material is matrix with the white cast iron; The wire group that in matrix, is distributing and forming by iron wire and high-carbon steel wire; Used iron wire and high-carbon steel wire diameter are 1-2mm, and the overall length of iron wire and high-carbon steel wire is suitable in the material, and the diameter of wire group is 10-15cm; The volume percent that iron wire and high-carbon steel wire account for material altogether is 5-40%;
The following chemical components in percentage by weight of said white cast iron matrix: C is 2.6%～2.8%, and Si is 1.6%～2.2%, and Mn is 0.5-0.7%, and Gd is 0.5-2%, and < 0.08%, < 0.25%, all the other are Fe to S to P;
The following chemical components in percentage by weight of said high-carbon steel wire is: C is 0.55%～0.8%, and Si is 0.18%～0.21%, and Mn is 0.45-0.65%, and < 0.02%, < 0.02%, all the other are Fe to S to P;
The following chemical components in percentage by weight of iron wire is: C is 0.04-0.06%, and Si is 0.2～0.3%, and Mn is 0.25-0.35%, and < 0.02%, < 0.025%, all the other are Fe to S to P.
Compound C r23C6, Fe4N and SiN particle are also distributing in the matrix.
A kind of preparation method of heat-resisting White Cast Iron Material is characterized in that: it may further comprise the steps:
The preparation of chromium plating high-carbon steel wire and nitriding iron wire: cut-off directly for 1-2mm, composition weight percentage is: C 0.55%～0.8%, Si 0.18%～0.21%, Mn 0.45-0.65%, P 0.02%, S 0.02%, all the other are the high-carbon steel wire of Fe;
Cut-off is that: C is 0.04-0.06% for 1-2mm, composition directly; Si is 0.2～0.3%, and Mn is 0.25-0.35%, and P < 0.02%; S < 0.025%; All the other are the iron wire of Fe, the overall length of the iron wire of getting and high-carbon steel wire suitable, the volume percent that control iron wire and high-carbon steel wire account for material altogether is 5-40%; In its chrome-faced, the thickness of chromium coating is the 50-500 micron to high-carbon steel wire by ordinary method; Iron wire is pressed ordinary method at its surface carburization; The thickness of nitrided case is the 50-100 micron;
The ordinary method of pressing cleaning ball production forms globular mixing mariages wire group (each rhizoid of chromium plating high-carbon steel wire and nitriding iron wire with above-mentioned chromium plating high-carbon steel wire and nitriding iron wire; Form mariages wire group); Wire group's diameter is 10-15cm,, number of metal silk group is put into casting mold mo(u)ld bottom half die cavity; The tightness of wire group guarantees that by the volume percent decision that iron wire and high-carbon steel wire account for material wire group just in time piles casting mold; After deploying, the mo(u)ld top half of casting mold is placed on the mo(u)ld bottom half, molten iron pouring is waited in the mould assembling back that finishes;
The preparation of White Cast Iron Material matrix: percentage composition C is 2.6%～2.8% by weight, Si is 1.6%～2.2%, Mn be 0.5-0.7%, Gd be 0.5-2%, P 0.08%, S 0.25%, all the other prepare burden for Fe; Raw material melts in induction furnace, obtains liquid molten iron, and temperature of fusion is 1460-1510 ℃;
Above-mentioned white cast iron molten iron is poured into the dry sand casting mold that wire group is housed; Liquid molten iron surrounds boronising iron wire and nickel coated high-carbon steel wire, cooled and solidified then, form with the white cast iron be base wherein be distributed with the material that wire is rolled into a ball.
It is following that the present invention compares the beneficial effect of prior art:
1, the present invention adopts low-cost iron wire and steel wire strongthener; The nitrogen of nitriding iron wire and the chromium of steel wire coating are dissolved in and form alloy carbide in the cast iron.Iron wire and high-carbon steel wire self have suitable intensity and high toughness.
2, in addition, iron wire and high-carbon steel wire have the good heat endurance ability.The matrix of iron wire and steel wire and white pig iron all is an iron.Therefore iron wire and steel wire and white pig iron are easy to combine, and form good metallurgical binding like this.Like this, high iron wire and carbon steel wire are distributed in the fragility white pig iron, material is had good high temperature strengthen and toughening effect.
3, white pig iron contains a large amount of cementites, so hardness is high, has the good heat endurance ability.After chromium that molten iron gets into nitrogen and the Steel Wire Surface on casting mold die cavity and iron wire surface contacted, N and Cr were fused to molten iron, and the Fe in the molten iron, Si and C and N and Cr react formation stable compound Cr23C6, Fe4N and SiN, are distributed in the matrix.
4, Gd has stabilization to the cementite in the tissue of white pig iron in the material, for the thermotolerance of white pig iron important effect is arranged.C and Gd also can form C and Gd compound Gd3C in addition, help the raising of material thermal resistance.
5, material of the present invention can be used hardware in production rotary kiln body, high temperature steel stove.P, the S impurity in being in the material of the present invention is controlled at the scope of permission.
6, of the present invention the cost of material is low, and preparation technology is easy, and production cost is low, and steel wire and compound (carbide, nitride) mix enhancing white pig iron, and the alloy material performance of being produced is good, and is convenient to very much suitability for industrialized production.
Each material property of the present invention is seen table 1.
Description of drawings
The metallographic structure of the heat-resisting White Cast Iron Material that Fig. 1 makes for the embodiment of the invention one.
Fig. 1 can see at white cast iron and combining well with wire interface.
Embodiment
Below each embodiment only with of the present invention the explaining of opposing, weight percent wherein all can change weight g, kg or other weight unit into.It is commercial that following diameter is that wire is, nickel plating and nitriding self-control.
Embodiment one:
The preparation of the preparation of chromium plating high-carbon steel wire and nitriding iron wire:
Getting component content is: C is 0.55%, and Si is 0.18%, and Mn is 0.45%, and < 0.02%, < 0.02%, all the other are the high-carbon steel wire of Fe to S to P, high-carbon steel wire diameter 1mm;
Getting component content is: C is 0.04%, and Si is 0.2%, and Mn is 0.25%, and < 0.02%, < 0.025%, all the other are the iron wire of Fe to S to P, iron wire diameter 1mm; The overall length of used iron wire and high-carbon steel wire is suitable, and controlling the volume percent that two kinds of wires account for material altogether is 5%.
The iron wire surface is by the ordinary method nitriding, and the thickness of nitrided case is 50 microns; The high-carbon steel wire surface is by ordinary method chromium plating, and the thickness of chromium coating is 50 microns.
(chromium plating high-carbon steel wire and nitriding iron wire are respectively got a rhizoid with nitriding iron wire formation globular mixing mariages wire group with above-mentioned chromium plating high-carbon steel wire by ordinary method that cleaning ball is produced; Two rhizoids are shaped simultaneously; Form mariages wire group; Moulding can be made by the cleaning ball of the usefulness that washes the dishes or the method for title steel wire lump), wire group diameter is 15cm, and number of metal silk group is put into casting mold mo(u)ld bottom half die cavity; The tightness of wire group guarantees that by the volume percent decision that iron wire and high-carbon steel wire account for material wire group just in time piles casting mold (volume percent that iron wire and high-carbon steel wire account for material altogether is 5%); After deploying, the mo(u)ld top half of casting mold is placed on the mo(u)ld bottom half, molten iron pouring is waited in the mould assembling back that finishes;
The preparation of White Cast Iron Material matrix: percentage composition C is 2.6% by weight, and Si is 1.6%, and Mn is 0.5%, and Gd is 0.5%, and < 0.08%, < 0.25%, all the other prepare burden for Fe S P; Raw material melts in induction furnace, and temperature of fusion is 1485-1495 ℃;
Above-mentioned white cast iron molten iron is poured into the dry sand casting mold of the wire group that chromium plating high-carbon steel wire and the formation of nitriding iron wire are housed; Liquid molten iron surrounds boronising iron wire and nickel coated high-carbon steel wire, cooled and solidified then, form with the white cast iron be base wherein be distributed with the material that wire is rolled into a ball.
Embodiment two:
White Cast Iron Material matrix composition percentage composition: C by weight is 2.8%, and Si is 2.2%, and Mn is 0.7%, and Gd is 2%, and < 0.08%, < 0.25%, all the other prepare burden for Fe S P;
The composition weight percentage content of high-carbon steel wire is: C is 0.8%, and Si is 0.21%, and Mn is 0.65%, and < 0.02%, < 0.02%, all the other are Fe to S to P.High-carbon steel wire diameter 1.5mm;
The composition weight percentage content of iron wire is: C is 0.06%, and Si is 0.3%, and Mn is 0.35%, and < 0.02%, < 0.025%, all the other are Fe to S to P.Iron wire diameter 1.5mm;
Used iron wire is suitable with the high-carbon steel wire overall length in the preparation process, and controlling the volume percent that two kinds of wires account for material is 40%.
The iron wire surface is by the ordinary method nitriding, and the thickness of nitrided case is 100 microns; The high-carbon steel wire surface is by ordinary method chromium plating, and the thickness of chromium coating is 500 microns; Two kinds of wires making above-mentioned processing by the ordinary method of cleaning ball production are respectively got the mixing mariages wire group of a formation, and wire group diameter is 10cm.
The preparation process is with embodiment one.
Embodiment three:
White Cast Iron Material matrix composition percentage composition: C by weight is 2.7%, and Si is 1.9%, and Mn is 0.6%, and Gd is 0.9%, and < 0.08%, < 0.25%, all the other prepare burden for Fe S P.
The composition weight percentage content of high-carbon steel wire is: C is 0.57%, and Si is 0.19%, and Mn is 0.55%, and < 0.02%, < 0.02%, all the other are Fe to S to P.The high-carbon steel wire diameter is 1.5mm
The composition weight percentage content of iron wire is: C is 0.05%, and Si is 0.25%, and Mn is 0.3%, and < 0.02%, < 0.025%, all the other are Fe to S to P, and the iron wire diameter is 2mm;
In the preparation process, the overall length of used iron wire and high-carbon steel wire is suitable, and the volume percent that control high-carbon steel wire and two kinds of wires of iron wire account for material is 30%.
Iron wire surface carburization, the thickness of nitrided case are 80 microns; High-carbon steel wire chrome-faced, chromium coating thickness are 200 microns; Make the mixing mariages wire group that above-mentioned two kinds of wires of handling are respectively got a formation by the ordinary method of cleaning ball production, wire group diameter is 12cm.
The preparation process is with embodiment one.
The comparative example four: proportioning raw materials is within the scope of the present invention instance not
White Cast Iron Material matrix composition percentage composition: C by weight is 2.3%, and Si is 1.4%, and Mn is 0.3%, and Gd is 0.3%, and < 0.08%, < 0.25%, all the other prepare burden for Fe S P.
The composition weight percentage content of high-carbon steel wire is: C is 0.4%, and Si is 0.15%, and Mn is 0.3%, and < 0.02%, < 0.02%, all the other are Fe to S to P.
The composition weight percentage content of iron wire is: C is 0.02%, and Si is 0.1%, and Mn is 0.1%, and < 0.02%, < 0.025%, all the other are Fe to S to P.
In the preparation process, used iron wire is suitable with high-carbon steel wire length, and the volume percent that control high-carbon steel wire and two kinds of wires of iron wire account for material is 4%;
Two kinds of wire diameters are 1mm; Iron wire surface carburization, the thickness of nitrided case are 300 microns; High-carbon steel wire not chromium plating of surface; By the ordinary method of cleaning ball production make above-mentioned two kinds not the wire of coating respectively get the mixing mariages wire group of a formation, wire group diameter is 12cm.
The preparation process is with embodiment one.
The comparative example five: proportioning raw materials is within the scope of the present invention instance not
White Cast Iron Material matrix composition percentage composition: C by weight is 3%, and Si is 3%, and Mn is 0.9%, and Gd is 3%, and < 0.08%, < 0.25%, all the other prepare burden for Fe S P.
The composition weight percentage content of high-carbon steel wire is: C is 1%, and Si is 0.25%, and Mn is 0.7%, and < 0.02%, < 0.02%, all the other are Fe to S to P.
The composition weight percentage content of iron wire is: C is 0.7%, and Si is 0.4%, and Mn is 0.4%, and < 0.02%, < 0.025%, all the other are Fe to S to P.
In the preparation process, used iron wire is suitable with high-carbon steel wire length, and the volume percent that control high-carbon steel wire and two kinds of wires of iron wire account for material is 45%;
Two kinds of wire diameters are 0.8mm; Iron wire not nitriding of surface, the high-carbon steel wire chrome-faced, chromium coating thickness is 600 microns.Make the mixing mariages wire group that above-mentioned two kinds of wires (iron wire and chromium plating high-carbon steel wire) are respectively got a formation by the ordinary method of cleaning ball production, wire group diameter is 15cm.
The preparation process is with embodiment one.
Table 1
Visible by last table, C, Si, Mn increase in the chemical ingredients of white pig iron and high-carbon steel wire is beneficial to the raising of material at high temperature intensity in the material of the present invention.But too much, can reduce the toughness of body material.P and S increase, and also can reduce the toughness of body material.Flexible reduces the hot strength that can reduce material.
The increase of Gd not only is beneficial to the raising of hot strength in the white pig iron, and helps the toughness raising.But, too much cause the increase of Gd and C compound, to such an extent as to can reduce the toughness hot strength of material.
The increase of high-carbon steel wire volume percent is beneficial to the raising of toughness of material.But too much, can cause the coating imperfection of white pig iron, reduce the hot strength of material, therefore also reduce the thermotolerance of material high-carbon steel wire.
Claims (1)
1. the preparation method of a heat-resisting White Cast Iron Material, it is characterized in that: it may further comprise the steps:
The preparation of chromium plating high-carbon steel wire and nitriding iron wire: cut-off directly for 1-2mm, composition weight percentage is: C 0.55%～0.8%, Si 0.18%～0.21%, Mn 0.45-0.65%, P 0.02%, S 0.02%, all the other are the high-carbon steel wire of Fe;
Cut-off is that: C is 0.04-0.06% for 1-2mm, composition directly; Si is 0.2～0.3%, and Mn is 0.25-0.35%, and P < 0.02%; S < 0.025%; All the other are the iron wire of Fe, the overall length of the iron wire of getting and high-carbon steel wire suitable, the volume percent that control iron wire and high-carbon steel wire account for material altogether is 5-40%; In its chrome-faced, the thickness of chromium coating is the 50-500 micron to high-carbon steel wire by ordinary method; Iron wire is pressed ordinary method at its surface carburization; The thickness of nitrided case is the 50-100 micron;
The ordinary method of pressing cleaning ball production forms globular mixing mariages wire group with above-mentioned chromium plating high-carbon steel wire and each one on nitriding iron wire; Wire group's diameter is 10-15cm; Number of metal silk group is put into casting mold mo(u)ld bottom half die cavity, and the tightness of wire group guarantees that by the volume percent decision that iron wire and high-carbon steel wire account for material wire group just in time piles casting mold; After deploying, the mo(u)ld top half of casting mold is placed on the mo(u)ld bottom half, molten iron pouring is waited in the mould assembling back that finishes;
The preparation of White Cast Iron Material matrix: percentage composition C is 2.6%～2.8% by weight, Si is 1.6%～2.2%, Mn be 0.5-0.7%, Gd be 0.5-2%, P 0.08%, S 0.25%, all the other prepare burden for Fe; Raw material melts in induction furnace, obtains liquid molten iron, and temperature of fusion is 1460-1510 ℃;
Above-mentioned white cast iron molten iron is poured into the dry sand casting mold that wire group is housed; Liquid molten iron surrounds boronising iron wire and nickel coated high-carbon steel wire, cooled and solidified then, form with the white cast iron be base wherein be distributed with the material that wire is rolled into a ball.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101705453A (en) * | 2009-11-09 | 2010-05-12 | 西安建筑科技大学 | Process for preparing ductile cast iron-based composite |
| CN101709441A (en) * | 2009-11-09 | 2010-05-19 | 西安建筑科技大学 | Preparation process of nodular cast iron-based composite material |
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| JPS61204348A (en) * | 1985-03-07 | 1986-09-10 | Shinichi Enomoto | Casting alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101705453A (en) * | 2009-11-09 | 2010-05-12 | 西安建筑科技大学 | Process for preparing ductile cast iron-based composite |
| CN101709441A (en) * | 2009-11-09 | 2010-05-19 | 西安建筑科技大学 | Preparation process of nodular cast iron-based composite material |
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Effective date of registration: 20151123 Address after: 211600 No. 13, health Road, Jinhu County, Jiangsu, Huaian Patentee after: Jinhu Zhongbo IOT Technology Co., Ltd. Address before: 210044 Nanjing City, Pukou Province, Nanjing Road, No. 219, No. six, No. Patentee before: Nanjing University of Information Science and Technology |
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