CN1019987C - Heatfatigue deterioration-proof grey cast iron - Google Patents
Heatfatigue deterioration-proof grey cast iron Download PDFInfo
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- CN1019987C CN1019987C CN 90106325 CN90106325A CN1019987C CN 1019987 C CN1019987 C CN 1019987C CN 90106325 CN90106325 CN 90106325 CN 90106325 A CN90106325 A CN 90106325A CN 1019987 C CN1019987 C CN 1019987C
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- cast iron
- iron
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- thermal fatigue
- fatigue resistance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
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- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to a gray cast iron which resists thermal fatigue and deterioration and contains C, Si, Mn, P, S, K, Na, impurities, etc. A cast state metallographic structure contains pearlite, a small amount of ferrite, iron phosphide eutectic, and fine flake graphite. The present invention is suitable for preparing steel ingot moulds, diesel engine exhaust gas manifolds, glass molds, etc.
Description
The present invention relates to cast iron alloy, particularly, be applicable to and manufacture ingot mold, coke oven quenching car liner plate, brake drum, diesel exhaust gas menifold, cylinder head, glass mold etc. about the rotten graphitic cast iron of a kind of thermal fatigue resistance.
At present, the ingot mold that domestic iron and steel industry is used adopts common grey iron mostly, publish China Machine Press in April, 1984 " cast iron handbook P113 page or leaf discloses a kind of graphitic cast iron of manufacturing ingot mold, the ingot mold that adopts this material to manufacture is prone to early stage cracking and bursts phenomenon, only be more than 40 mean life, mould consumption high (generally at 20-40 kilogram/ton steel).
EP-0076541A2 disclosed a kind of " being used to produce the cast iron steel ingot mould and the manufacture method thereof of steel ingot ", employing makes the method for the content of silicon in the cast iron less than the content and the raising ingot mold bottom phosphorus content of manganese, has reduced the probability of ingot mold bottom early fracture.The content of manganese in " casting " 1988 the 6th phases 27 pages of disclosed a kind of suitable increase graphitic cast iron of " application of the low silicon graphitic cast iron ingot mold of a middle manganese " literary composition, the content that reduces silicon improves the 40-60% in work-ing life of ingot mold.Its weak point is above-mentioned two kinds of method complex manufacturing.Open up new approach, develop that a kind of production technique is simple, high life, ingot mold material that the mould consumption is low be very necessary.
The objective of the invention is to overcome weak point of the prior art and provide that a kind of production technique is simple, thermal fatigue resistance is good, high life, the rotten graphitic cast iron of thermal fatigue resistance that the mould consumption is low.
Purpose of the present invention can realize by following measure:
The present invention is the rotten graphitic cast iron of a kind of thermal fatigue resistance, is made up of Chemical Composition such as C, Si, Mn, P, S and impurity, it is characterized in that adopting the alterant that contains K, Na that common grey iron is carried out the liquid state processing of going bad, and makes its chemical constitution (weight) be:
C 3.3-3.9%
Si 1.2-1.8%
Mn 0.6-1.2%
P ＜0.15%
S ＜0.10
K 0.0005-0.003%
Na 0.002-0.009%
Surplus is Fe and other impurity
Purpose of the present invention can also further realize by following measure:
The thermal fatigue resistance of the present invention graphitic cast iron that goes bad is characterized in that obtaining equally distributed shred shape graphite under as cast condition, and its metallographic structure is: perlite+a little ferrite+iron phosphide eutectic+shred shape graphite.
The K that the present invention uses, the chemical ingredients of Na alterant are: K, Na20～25%, and Si15～30%, Ca5～50%, Mg0.5～1%, Al0.1～1%, Fe10～15%, F8～10%, C0.01～0.1%, the add-on of rotten matter is 0.1～5%.
The rotten graphitic cast iron of thermal fatigue resistance of the present invention adopts general cupola furnace or other smelting furnace, as electric arc furnace, induction furnace, crucible oven, reverberatory furnace etc., adopt the common process melting, alterant can be added in when tapping a blast furnace in the iron notch and flow in the hot metal ladle with molten iron, leave standstill, skim through the rotten molten iron of handling, molten iron temperature reaches 1220-1300 ℃ to be poured into a mould, and production technique is simple.
The rotten graphitic cast iron of thermal fatigue resistance of the present invention obtains equally distributed shred shape graphite (seeing Fig. 2, Fig. 3) under as cast condition,＜0.01 millimeter approximately of graphite length, regional area is greater than 0.01 millimeter, and the graphite flake of common grey iron is short and small, gathers into chrysanthemum shape distribution (see figure 1) by point graphite.
Rotten graphitic cast iron of the present invention and the constituent content of common grey iron on graphite show after measured, Si on both graphite, Mn content is all than its matrix height, and the Si on the former graphite, Mn content are apparently higher than the latter (the former Si7%, Mn6%, latter Si1.8%, Mn1%).
Shown by thermal fatigue test: the rotten graphitic cast iron of thermal fatigue resistance of the present invention is about 3 times of common grey iron.
Find out from thermal conductivity coefficient (seeing Table 1), the Young's modulus (table 2) of measuring rotten graphitic cast iron of thermal fatigue resistance of the present invention and common grey iron: when the rotten graphitic cast iron of thermal fatigue resistance of the present invention is higher than 400 ℃, thermal conductivity coefficient is than common grey iron height, high by 7.19% in the time of 500 ℃, high by 30% in the time of 600 ℃;
The Young's modulus of the rotten graphitic cast iron of thermal fatigue resistance of the present invention is lower than common grey iron, when cold zone (25-250 ℃), low 2.45-3.39% is when middle warm area (300～500 ℃), low by 4.05～4.7%, in the high-temperature zone when (550～800 ℃) low 5.0～12.89%.
After tested, the mechanical property ratio common grey iron of the rotten graphitic cast iron of thermal fatigue resistance of the present invention is lower slightly.
Under the thermal cycle conditions condition of severe, have high thermal conductivity and low elastic modulus thermal fatigue resistance decisive role to cast iron, tensile strength only plays accessory effect.
Through testing and facts have proved, the rotten graphitic cast iron thermal fatigue resistance of thermal fatigue resistance of the present invention is good, high life.
The drawing of accompanying drawing is described as follows:
Fig. 1: common grey iron rosette graphite form metallograph
Fig. 2: the thermal fatigue resistance of the present invention graphitic cast iron shred shape graphite form metallograph that goes bad
Fig. 3: the thermal fatigue resistance of the present invention graphitic cast iron metallographic structure figure that goes bad
The present invention will now be further detailed embodiment:
Embodiment 1:
Adopt the rotten graphitic cast iron of thermal fatigue resistance of the present invention to manufacture the 215mm ingot mold, 16439.42 tons of cast straight carbon steels, teeming temperature 1580-1620 ℃, pour into a mould the demoulding in back 30 minutes, adopt hardening cooling 1 minute and 30 seconds, the mould temperature is cooled to 80-120 ℃, 12.25 kilograms of/ton steel of average mould consumption, be more than two times of mean life of common grey iron ingot mold under the identical cooling conditions mean life 93.08 times the highest work-ing life 139 times.
Embodiment 2:
Adopt the rotten graphitic cast iron of thermal fatigue resistance of the present invention to manufacture the 500mm ingot mold, cast straight carbon steel, teeming temperature 1580-1620 ℃, adopt air cooling after watering steel, the demoulding after 8 hours, mean life 164 times, the highest work-ing life 253 times, 7.62 kilograms of/ton steel of average mould consumption.
The present invention compared with prior art has following advantage:
1, thermal conductivity height, Young's modulus is low, thermal fatigue resistance is good.
2, Service Life of Ingot Mold height take the 215mm ingot mould as example, is more than the twice of common grey iron Service Life of Ingot Mold.
3, production technology is simple, cost is low, and explained hereafter need not increase equipment routinely.
Table 1 Modified Grey Cast Iron With Thermal Fatigue Resistance of the present invention and common grey iron thermal conductivity coefficient
Order temperature thermal conductivity coefficient Wcm-1℃
-1
Number ℃ Modified Grey Cast Iron With Thermal Fatigue Resistance common grey iron of the present invention
(density 7.1 gram/cm3) (density 7.2 gram/cm3）
1 200 - 0.4476
2 300 0.4171 0.4250
3 400 0.3831 0.4045
4 500 0.3592 0.3351
5 600 0.3351 0.2572
6 700 0.3036 -
The Young's modulus system of table 2 Modified Grey Cast Iron With Thermal Fatigue Resistance of the present invention and common grey iron
The meter table
Class temperature Young's modulus (MPa)
Other ℃ of Modified Grey Cast Iron With Thermal Fatigue Resistance common grey iron of the present invention
25 105500 108100
50 105000 107200
Low
100 102800 105100
Temperature 150 99,800 103200
200 98200 101100
The district
250 96800 100200
300 94700 98700
In 350 93,400 97400
400 92300 96300
Temperature
450 91200 95600
500 91100 95600
The district
550 90800 95600
600 90100 95400
High by 650 87,600 94400
700 85100 91600
Temperature
750 81000 87600
Distinguish 800 71,600 82200
Claims (1)
1, the rotten graphitic cast iron of a kind of thermal fatigue resistance obtains equally distributed shred shape graphite under as cast condition, and metallographic structure is: perlite+a little ferrite+iron phosphide eutectic+shred shape graphite;
It is characterized in that chemical constitution (weight) is:
C 3.3-3.9%、
Si 1.2-1.8%、
Mn 0.6-1.2%、
P ＜0.15%、
S ＜0.10%、
K 0.0005-0.003%、
Na 0.002-0.009%、
Surplus is Fe and other impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106325 CN1019987C (en) | 1990-12-07 | 1990-12-07 | Heatfatigue deterioration-proof grey cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90106325 CN1019987C (en) | 1990-12-07 | 1990-12-07 | Heatfatigue deterioration-proof grey cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1051396A CN1051396A (en) | 1991-05-15 |
| CN1019987C true CN1019987C (en) | 1993-03-03 |
Family
ID=4879968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90106325 Expired - Fee Related CN1019987C (en) | 1990-12-07 | 1990-12-07 | Heatfatigue deterioration-proof grey cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1019987C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE526903C2 (en) * | 2002-05-13 | 2005-11-15 | Scania Cv Ab | Gray iron alloy and cast internal combustion engine component |
| CN108311654B (en) * | 2018-02-09 | 2020-06-16 | 邢台德龙机械轧辊有限公司 | Production method for preparing thick-wall metal die by centrifugal method |
| CN116287960B (en) * | 2022-12-02 | 2024-10-18 | 山东宏马工程机械有限公司 | High-heat-conductivity brake disc and preparation method thereof |
-
1990
- 1990-12-07 CN CN 90106325 patent/CN1019987C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1051396A (en) | 1991-05-15 |
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