CN1024140C - High strength easy cutting cast iron - Google Patents
High strength easy cutting cast iron Download PDFInfo
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- CN1024140C CN1024140C CN 89101097 CN89101097A CN1024140C CN 1024140 C CN1024140 C CN 1024140C CN 89101097 CN89101097 CN 89101097 CN 89101097 A CN89101097 A CN 89101097A CN 1024140 C CN1024140 C CN 1024140C
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- cast iron
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
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Abstract
The present invention relates to high strength easy cutting cast iron. On the basis of MT200 (HT20 to 40), the ratio of silicon to carbon is improved from (0.4 to 0.5) to about (0.64 to 0.9), and manganese content is reduced from (0.8 to 1.2) % to (0.5 to 0.8) %. Inoculation is carried out before casting, and the surface hardness of casts is lower than the central hardness of the casts. A metallurgical structure within the surface depth of 0.5 to 1.5mm is ferrite of 30 to 95% and point graphite. A metallurgical structure in the central part is pearlite of more than 90 %, and accordingly the hard cast of the cast is reduced to HB160 to 210 when intensity is improved. The present invention has good cutting properties and is suitable for producing small casts or thin-wall casts with the wall thickness of less than or equal to 50 millimeters.
Description
The present invention ties up to HT200(HT20-40) the basis on improved grey cast iron, have intensity height, free machining advantage, the small-sized cast iron or the thin-section casting that are specially adapted to produce in enormous quantities.
At present, the grey cast iron that is widely used in machinofacture, most traditional proportioning methods that adopt, its silicon, carbon ratio (Si/C) are generally 0.4～0.5, chilling tendency is bigger, and the hardness of cast(ing) surface is higher, is difficult to machining, often make the avalanche of cutting edge roundness bulk, production in enormous quantities is caused serious threat.
In Japanese Patent Publication 55-36244, a kind of manufacture method of tough cast iron is disclosed.This tough cast iron has that intensity height, chilling tendency are low, the advantage of good processability.Its weak point is to need to use furnace melting, and the technical requirements height can produce a large amount of slags and irritant gas in fusion process, and it is healthy to be harmful to the workman, causes environmental pollution.
According to " modern cast iron " second phase in 1988 report, with the grinding machine foundry goods of high Si/C Cast Iron Production, this foundry goods cupola melting has the intensity height, free machining advantage.Its weak point is that hardness is still higher, still can not satisfy the needs (unit type machine as some introduction only allows workhardness to be no more than the part of HB220) of some special efficient cutting apparatus.
The objective of the invention is to avoid above-mentioned the deficiencies in the prior art part, a kind of high strength easy cutting cast iron of novelty is provided.This cast iron is to keep or improve HT200(HT20-40) on the basis of using strength, make casting hardness drop to HB150-210, to adapt to requirements of large-scale production.
Purpose of the present invention can reach by following measure:
Major ingredient in the cast iron is C, Si, Mn, it is characterized in that the cast iron composition scope among the present invention is C=3.10-3.6%, Si=2.3-2.8%, Mn=0.5-0.8%.
Control silicon carbon ratio Si/C=0.64-0.9 in the composition ratio, CE=3.9-4.3%.
Except that major ingredient, can also contain a little P, S, P≤0.15%, S≤0.12%.
This cast iron is to adopt cupola melting technology, it is characterized in that the stokehold breeds with 75 ferrosilicon.
Be satisfied with the molten iron foundry goods that cast forms in wet sandbox of this cast iron composition, can produce the effect that surface hardness is lower than core rigidities, its case depth 0.5-1.5mm is ferrite and the point graphite point graphite of 30-95% with interior metallographic structure, and the metallographic structure in centre is the perlite more than 90%.
Accompanying drawing institute is bright:
The surface structure of Fig. 1-foundry goods, ferrite accounts for 95%, and the crystal boundary place is the perlite that eutectic is transformed into, and amplifies 100 times.
The interior tissue of Fig. 2-same foundry goods, perlite accounts for 95%, amplifies 100 times.
Now in conjunction with the embodiments the present invention is further described:
Following table is each Chemical Composition schedule of proportion of embodiment.
After table is seen literary composition
Above-mentioned each composition is adopted cupola melting technology in ratio in the table, and carry out the stokehold with 75 ferrosilicon and breed, produce molten iron, in wet sandbox, pour into foundry goods.
With Cast Iron Production of the present invention three kinds of freezer compressor foundry goods, 35 millimeters of thickests, the center does not have loose, only 3 millimeters of minimum wall thickness (MINI W.)s, the surface no spoken parts in traditional operas.On the cross section of foundry goods, to organize very evenly, difference of hardness is no more than 10HB.Evidence, every chemical ingredients meet the present invention's regulation, and tensile strength can reach 210-264MPn, and bending strength can reach 401-470MPa, and hardness is HB156-210.
The present invention has following advantage compared to existing technology:
1, cast iron generation case hardness itself is lower than the effect of core rigidities, thereby can carry the high-intensity while, makes casting hardness be reduced to HB160-210, so the intensity of cast iron own is high and cutting is easy, good processability.
2, structure of cast iron is even, and the center does not have loose, thickest 35MM, and minimum wall thickness (MINI W.) is 3MM only.
3, cast iron tensile strength reaches 210-264MPa, and bending strength can reach 401-470MPa, and hardness is HB156-210.
4, melting only needs furnace cupola, can not produce a large amount of slags and irritative gas.
5, adapt to production in enormous quantities.
Order chemical analysis % Si/G σ w σ w hardness
Number G Si Mn CE N/mm2N/mm
2HB
Example 1 3.38 2.39 0.66 4.18 0.70 264 470 156-187
Example 2 3.25 2.78 0.80 4.18 0.85 248 452 170-197
Claims (1)
1, a kind of high strength easy cutting cast iron is characterized in that it consists of: C3.25-3.38%, Si2.39-2.78%, Mn0.66-0.8%, P≤0.15%, S≤0.12%, Fe surplus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89101097 CN1024140C (en) | 1989-03-02 | 1989-03-02 | High strength easy cutting cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89101097 CN1024140C (en) | 1989-03-02 | 1989-03-02 | High strength easy cutting cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1045279A CN1045279A (en) | 1990-09-12 |
| CN1024140C true CN1024140C (en) | 1994-04-06 |
Family
ID=4854143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89101097 Expired - Fee Related CN1024140C (en) | 1989-03-02 | 1989-03-02 | High strength easy cutting cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1024140C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010010701A1 (en) * | 2008-07-25 | 2010-01-28 | パナソニック株式会社 | Diaphragm for speaker, speaker, and method for producing diaphragm for speaker |
| SE534626C2 (en) * | 2009-09-08 | 2011-10-25 | Scania Cv Ab | Method for determining the compactness of a compact graphite iron |
| CN103952644A (en) * | 2014-03-26 | 2014-07-30 | 安徽通润汽车零部件有限公司 | Alloy for producing jack cap |
| CN104988378A (en) * | 2015-06-11 | 2015-10-21 | 安徽省宁国诚信耐磨材料有限公司 | Mold special for ductile iron grinding balls and manufacturing technology of mold |
-
1989
- 1989-03-02 CN CN 89101097 patent/CN1024140C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1045279A (en) | 1990-09-12 |
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