CN103614611B - A kind of manganese silicon rich chromium cast iron and preparation method thereof - Google Patents
A kind of manganese silicon rich chromium cast iron and preparation method thereof Download PDFInfo
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Abstract
A kind of preparation method of manganese silicon rich chromium cast iron, by weight percentage, by steel scrap, the pig iron, ferrochrome, ferromanganese and ferrosilicon according to carbon content in product be 2.2% ~ 2.8%, chromium content is 13% ~ 15%, Fe content is 3% ~ 5%, silicone content is 2% ~ 4%, sulphur content≤0.05%, phosphorus content≤0.05%, all the other prepare burden for iron; After steel scrap, the pig iron are put into induction furnace fusing, carry out pre-deoxidation operation, then add ferrochrome, ferromanganese and ferrosilicon, obtain molten iron, after molten iron being adjusted to the requirement of qualified molten iron, heating up and carry out final deoxygenation, come out of the stove, cast, obtains cast iron; The cast iron of acquisition is carried out air cooling, then heats tempering, obtain manganese silicon rich chromium cast iron.Technique is simple, and rationally, the impelling strength of obtained manganese silicon rich chromium cast iron is good, hardness is high, while having Cr15Mo3 rich chromium cast iron standard of performance, reduces raw-material production cost for batching.
Description
Technical field
The invention belongs to Wear-resistant metal material field, particularly a kind of manganese silicon rich chromium cast iron and preparation method thereof.
Background technology
Rich chromium cast iron is a kind of wear-resistant material of excellent property, and it has the feature of high rigidity and high impact toughness.The typical trade mark of rich chromium cast iron is the white pig iron of Cr15Mo3, by the molybdenum element of interpolation 3% in this model rich chromium cast iron, increases the hardening capacity of rich chromium cast iron, obtains full martensitic matrix tissue.And molybdenum element belongs to expensive alloying elements, be the narrow resources of China, it is expensive, and the production cost adding molybdenum system rich chromium cast iron is high.In order to reduce molybdenum system rich chromium cast iron production cost, most effective means is the add-on reducing molybdenum element, but after reducing the add-on of molybdenum element, molybdenum system rich chromium cast iron resistance to abrasion also declines to a great extent, and work-ing life obviously shortens.
Manganese element can play the effect close with molybdenum element in raising rich chromium cast iron hardening capacity, but because manganese element is stablized in rich chromium cast iron matrix austenitic very capable, cause remained austenite content in tissue too much, in use there is martensitic transformation in residual austenite under external force, due to the stress that volumetric expansion is formed, foundry goods easily ftractures.By adding the method for molybdenum element content in boron or rare earth element reduction rich chromium cast iron, complex manufacturing, unstable properties, rich chromium cast iron mechanical property is undesirable.
Summary of the invention
It is lower that the technical problem to be solved in the present invention is to provide a kind of production cost, has the manganese silicon rich chromium cast iron and preparation method thereof of high rigidity, high tenacity.
Technical solution of the present invention is:
A kind of manganese silicon rich chromium cast iron, its chemical composition is by weight percentage:
Carbon 2.2% ~ 2.8%;
Chromium 13% ~ 15%;
Manganese 3% ~ 5%;
Silicon 2% ~ 4%;
Sulphur≤0.05%;
Phosphorus≤0.05%;
Iron surplus.
A preparation method for manganese silicon rich chromium cast iron, its concrete steps are as follows:
1.1, material choice
By weight percentage, by steel scrap, the pig iron, ferrochrome, ferromanganese and ferrosilicon according to carbon content in product be 2.2% ~ 2.8%, chromium content is 13% ~ 15%, Fe content is 3% ~ 5%, silicone content is 2% ~ 4%, sulphur content≤0.05%, phosphorus content≤0.05%, all the other prepare burden for iron;
1.2, after steel scrap, the pig iron being put into induction furnace fusing, carry out pre-deoxidation operation, then add ferrochrome, ferromanganese and ferrosilicon, obtain molten iron;
1.3, get molten iron sample and carry out on-the-spot sample analysis, according to analytical results, described molten iron is adjusted to the requirement of qualified molten iron;
1.4, molten iron temperature is brought up to 1550 DEG C ~ 1600 DEG C, add the aluminium accounting for described qualified molten steel quality 0.1% ~ 0.3%, carry out final deoxygenation, come out of the stove;
1.5, when temperature is down to 1400 DEG C ~ 1460 DEG C, start cast, obtain cast iron;
1.6, the cast iron of acquisition is heated to 850 DEG C ~ 950 DEG C, carries out air cooling, be then heated to 350 DEG C ~ 500 DEG C tempering 2h ~ 5h, obtain manganese silicon rich chromium cast iron.
In step 1.2, ferrochrome, ferromanganese and ferrosilicon, adding before in induction furnace, first carry out baking processing, with the greasy dirt of the moisture content and surface of removing ferrochrome, ferromanganese and ferrosilicon.
Beneficial effect of the present invention:
Technique is simple, and batching rationally.Add manganese element to improve hardening capacity, add the content that element silicon reduces carbon in austenite, to improve austenite generation martensite transformation temperature, after guaranteeing thermal treatment, obtain the rich chromium cast iron of full martensitic stucture.By strictly controlling silicon, manganese and the carbon content in manganese silicon rich chromium cast iron, the impelling strength of manganese silicon rich chromium cast iron is made to reach 6.2J/cm
2~ 9.2J/cm
2, hardness (HRC) can reach 54.2 ~ 61.2, while having Cr15Mo3 rich chromium cast iron standard of performance, reduces raw-material production cost.
Embodiment
Adopt medium-frequency induction furnace melting manganese silicon rich chromium cast iron, sand mold casting.
Embodiment 1
The chemical composition of manganese silicon rich chromium cast iron is as shown in table 1 by weight percentage:
Table 1 manganese silicon rich chromium cast iron composition and content (wt%)
1.1, material choice
By weight percentage, steel scrap, the pig iron, ferrochrome, ferromanganese and the ferrosilicon component requirements according to table 1 is prepared burden;
1.2, ferrochrome, ferromanganese and ferrosilicon are carried out baking processing, with the greasy dirt of the moisture content and surface of removing ferrochrome, ferromanganese and ferrosilicon; After steel scrap, the pig iron are put into induction furnace fusing, carry out pre-deoxidation operation, then add the ferrochrome of baking, ferromanganese and ferrosilicon, obtain molten iron;
1.3, get molten iron sample and carry out on-the-spot sample analysis, according to analytical results, described hot metal composition is adjusted to the qualified molten iron requirement of table 1;
1.4, molten iron temperature is brought up to 1550 DEG C ~ 1600 DEG C, add the aluminium accounting for described qualified molten steel quality 0.1%, carry out final deoxygenation, come out of the stove;
1.5, when temperature is down to 1400 DEG C, start cast, obtain cast iron;
1.6, the cast iron of acquisition is heated to 930 DEG C, carries out air cooling, be then heated to 400 DEG C of tempering 4h, obtain manganese silicon rich chromium cast iron, mechanical property is as shown in table 6.
Embodiment 2
The chemical composition of manganese silicon rich chromium cast iron is as shown in table 2 by weight percentage:
Table 2 manganese silicon rich chromium cast iron composition and content (wt%)
1.1, material choice
By weight percentage, steel scrap, the pig iron, ferrochrome, ferromanganese and the ferrosilicon component requirements according to table 2 is prepared burden;
1.2, ferrochrome, ferromanganese and ferrosilicon are carried out baking processing, with the greasy dirt of the moisture content and surface of removing ferrochrome, ferromanganese and ferrosilicon; After steel scrap, the pig iron are put into induction furnace fusing, carry out pre-deoxidation operation, then add the ferrochrome of baking, ferromanganese and ferrosilicon, obtain molten iron;
1.3, get molten iron sample and carry out on-the-spot sample analysis, according to analytical results, described hot metal composition is adjusted to the qualified molten iron requirement of table 2;
1.4, at 1550 DEG C ~ 1600 DEG C, add the aluminium accounting for described qualified molten steel quality 0.1%, carry out final deoxygenation, come out of the stove;
1.5, when temperature is down to 1460 DEG C, start cast, obtain cast iron;
1.6, the cast iron of acquisition is heated to 900 DEG C, carries out air cooling, be then heated to 400 DEG C of tempering 4h, obtain manganese silicon rich chromium cast iron, mechanical property is as shown in table 6.
Embodiment 3
The chemical composition of manganese silicon rich chromium cast iron is as shown in table 3 by weight percentage:
Table 3 manganese silicon rich chromium cast iron composition and content (wt%)
C | Cr | Mn | Si | S | P | Fe |
2.66 | 13.9 | 4.83 | 3.16 | 0.039 | 0.036 | Surplus |
1.1, material choice
By weight percentage, steel scrap, the pig iron, ferrochrome, ferromanganese and the ferrosilicon component requirements according to table 3 is prepared burden;
1.2, ferrochrome, ferromanganese and ferrosilicon are carried out baking processing, with the greasy dirt of the moisture content and surface of removing ferrochrome, ferromanganese and ferrosilicon; After steel scrap, the pig iron are put into induction furnace fusing, carry out pre-deoxidation operation, then add the ferrochrome of baking, ferromanganese and ferrosilicon, obtain molten iron;
1.3, get molten iron sample and carry out on-the-spot sample analysis, according to analytical results, described hot metal composition is adjusted to the qualified molten iron requirement of table 3;
1.4, at 1550 DEG C ~ 1600 DEG C, add the aluminium accounting for described qualified molten steel quality 0.1%, carry out final deoxygenation, come out of the stove;
1.5, when temperature is down to 1430 DEG C, start cast, obtain cast iron;
1.6, the cast iron of acquisition is heated to 900 DEG C, carries out air cooling, be then heated to 400 DEG C of tempering 4h, obtain manganese silicon rich chromium cast iron, mechanical property is as shown in table 6.
Embodiment 4
The chemical composition of manganese silicon rich chromium cast iron is as shown in table 4 by weight percentage:
Table 4 manganese silicon rich chromium cast iron composition and content (wt%)
1.1, material choice
By weight percentage, steel scrap, the pig iron, ferrochrome, ferromanganese and the ferrosilicon component requirements according to table 1 is prepared burden;
1.2, ferrochrome, ferromanganese and ferrosilicon are carried out baking processing, with the greasy dirt of the moisture content and surface of removing ferrochrome, ferromanganese and ferrosilicon; After steel scrap, the pig iron are put into induction furnace fusing, carry out pre-deoxidation operation, then add the ferrochrome of baking, ferromanganese and ferrosilicon, obtain molten iron;
1.3, get molten iron sample and carry out on-the-spot sample analysis, according to analytical results, described hot metal composition is adjusted to the qualified molten iron requirement of table 4;
1.4, molten iron temperature is brought up to 1550 DEG C ~ 1600 DEG C, add the aluminium accounting for described qualified molten steel quality 0.3%, carry out final deoxygenation, come out of the stove;
1.5, when temperature is down to 1400 DEG C, start cast, obtain cast iron;
1.6, the cast iron of acquisition is heated to 850 DEG C, carries out air cooling, be then heated to 350 DEG C of tempering 5h, obtain manganese silicon rich chromium cast iron, mechanical property is as shown in table 6.
Embodiment 5
The chemical composition of manganese silicon rich chromium cast iron is as shown in table 5 by weight percentage:
Table 5 manganese silicon rich chromium cast iron composition and content (wt%)
C | Cr | Mn | Si | S | P | Fe |
2.23 | 14.96 | 3.02 | 2.03 | 0.039 | 0.033 | Surplus |
1.1, material choice
By weight percentage, steel scrap, the pig iron, ferrochrome, ferromanganese and the ferrosilicon component requirements according to table 5 is prepared burden;
1.2, ferrochrome, ferromanganese and ferrosilicon are carried out baking processing, with the greasy dirt of the moisture content and surface of removing ferrochrome, ferromanganese and ferrosilicon; After steel scrap, the pig iron are put into induction furnace fusing, carry out pre-deoxidation operation, then add the ferrochrome of baking, ferromanganese and ferrosilicon, obtain molten iron;
1.3, sampling analysis, is adjusted to qualified molten iron by the molten iron of step 1.2 by the component requirements in table 5;
1.3, get molten iron sample and carry out on-the-spot sample analysis, according to analytical results, described hot metal composition is adjusted to the qualified molten iron requirement of table 5;
1.4, molten iron temperature is brought up to 1550 DEG C ~ 1600 DEG C, add the aluminium accounting for described qualified molten steel quality 0.2%, carry out final deoxygenation, come out of the stove;
1.5, when temperature is down to 1440 DEG C, start cast, obtain cast iron;
1.6, the cast iron of acquisition is heated to 950 DEG C, carries out air cooling, be then heated to 500 DEG C of tempering 2h, obtain manganese silicon rich chromium cast iron, mechanical property is as shown in table 6.
Table 6 manganese silicon rich chromium cast iron mechanical property table
Note: impelling strength test condition: 10mm × 10mm × 55mm non-notch sample, the tup quality of shock-testing machine is 15kg.
Claims (2)
1. a preparation method for manganese silicon rich chromium cast iron, is characterized in that:
Concrete steps are as follows:
1.1, material choice
By weight percentage, by steel scrap, the pig iron, ferrochrome, ferromanganese and ferrosilicon according to carbon content in product be 2.2% ~ 2.8%, chromium content is 13% ~ 15%, Fe content is 3% ~ 5%, silicone content is 2% ~ 4%, sulphur content≤0.05%, phosphorus content≤0.05%, all the other prepare burden for iron;
1.2, after steel scrap, the pig iron being put into induction furnace fusing, carry out pre-deoxidation operation, then add ferrochrome, ferromanganese and ferrosilicon, obtain molten iron;
1.3, get molten iron sample and carry out on-the-spot sample analysis, according to analytical results, described molten iron is adjusted to the requirement of qualified molten iron;
1.4, molten iron temperature is brought up to 1550 DEG C ~ 1600 DEG C, add the aluminium accounting for described qualified molten steel quality 0.1% ~ 0.3%, carry out final deoxygenation, come out of the stove;
1.5, when temperature is down to 1400 DEG C ~ 1460 DEG C, start cast, obtain cast iron;
1.6, the cast iron of acquisition is heated to 850 DEG C ~ 950 DEG C, carries out air cooling, be then heated to 350 DEG C ~ 500 DEG C tempering 2h ~ 5h, obtain manganese silicon rich chromium cast iron.
2. the preparation method of manganese silicon rich chromium cast iron according to claim 1, is characterized in that: in step 1.2, and ferrochrome, ferromanganese and ferrosilicon, adding before in induction furnace, first carry out baking processing.
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