CN1288969A - Special nodulizer for nodular cast iron and its production process - Google Patents
Special nodulizer for nodular cast iron and its production process Download PDFInfo
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- CN1288969A CN1288969A CN 00113189 CN00113189A CN1288969A CN 1288969 A CN1288969 A CN 1288969A CN 00113189 CN00113189 CN 00113189 CN 00113189 A CN00113189 A CN 00113189A CN 1288969 A CN1288969 A CN 1288969A
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Abstract
The composition of special spheroidizing medium is formed from (by weight ratio) rare earth 2-7, silicone 35-45, magnesium 5-10, barium 4-6, calcium 4-6, strontium 0.6-1, copper 2-5 and iron 20-50. Said invention can save annealing procedure, raise casting quality and rate of finished products and can greatly reduce casting cost.
Description
The present invention relates to the casting iron technology field, especially a kind of special nodulizer for nodular cast iron and production method thereof.
In casting industry, nodulizing agent is most important to output, quality and the performance of product, and the nodulizing agent of countries in the world use at present is of a great variety, the widely used alloy two big classes that pure magnesium and magnesium are arranged.Pure magnesium nodulizer is complex process when handling molten iron, the tired lock of operation, and security and poor reliability easily produce cigarette and flash of light, and labor condition is abominable, and it is healthy to influence the workman, and price is more expensive, the product cost height.Generally adopt RE-Mg-ferrosilicon alloy to make nodulizing agent in recent years both at home and abroad, as RE-Mg7-8 or RE-Mg9-10, though this class nodulizing agent can make the molten iron treatment process that bigger simplification is arranged, simple to operate, safe and reliable, but still there is following defective: 1, the cast iron starting material are required harsh, general requirement pig iron sulphur content is less than 0.02%, phosphorus content is less than 0.07%, the pig iron that middle-size and small-size ironworks produces (square iron) is difficult to reach this requirement, Foundry Production enterprise can only buy the few high duty pig iron of impurity and makes raw materials for production with high price, often because the pig iron is for the moment not in place, causes to hold up work for lack of material and increase production cost.2, above-mentioned nodulizing agent consumption is higher, and it is fast that molten iron temperature is descended, and the decaying spheroidisation time is short, needs can reach the spheroidal graphite cast iron standard by annealing operation in process treatment process, has increased product cost.Situations such as 3, magnesium iron, the especially thin-section casting of producing with other nodulizing agent at present easily produces subsurface porosity, crackle, spoken parts in traditional operas, hardness is irregular, oxidation is serious cause casting quality bad, the problem that scrap rate is high.
The objective of the invention is to overcome the deficiencies in the prior art, it is slow to provide a kind of, molten iron temperature lower to the casting raw material requirement to descend, fall time is long, and the cancellation annealing operation also can improve the special nodulizer for nodular cast iron and the production method thereof of casting quality and yield rate.
Purpose of the present invention realizes by following technical proposals:
The present invention contains following composition and weight ratio:
Rare earth 2-7 silicon 35-45 magnesium 5-10 barium 4-6
Calcium 4-6 strontium 0.6-1 copper 2-5 iron 20-50
Production method of the present invention places smelting vessel after getting the raw materials ready by above-mentioned composition and weight ratio, seals to smelt, and is heated to 1450-1500 ℃, pours in the metal trough after fully stirring and cools off, and requires to make bulk or granular according to different user, and packing is dispatched from the factory.
For further preventing subsurface porosity, crackle and spoken parts in traditional operas, eliminate the molybdenum that internal stress can increase the 1-1.5 weight part in the present invention.
For increasing the wear resistance and the intensity of foundry goods, can increase the titanium of 0.4-0.6% weight in the present invention.
During use, the consumption weight ratio of the present invention and molten iron is 1.3-1.5%.
The present invention is repeatedly exploring and is testing best composition combination of the special nodulizer for nodular cast iron that obtains and weight ratio in the practice repeatedly, gives full play to special promotion spheroidization of graphite that various nodularization elements are possessed separately and neutralization, repulsion disturbs spheroidization of graphite unit usually to reach best nodularization effect.The various nodularization elements that added had both guaranteed to promote spheroidization of graphite, neutralized to disturb the nodularization element, and the relict element in the foundry goods is controlled in the minimum extent, guaranteed the quality and the mechanical property of foundry goods.
Middle-weight rare earths of the present invention and magnesium, generate sulfide, phosphide with sulphur on the one hand, solved sulphur and phosphorus and can reduce carbon solubleness and be attached to the graphite crystal surface of growing in molten iron, hinder carbon atom by in the iron liquid to surface diffusion, and hinder the problem that graphite is spherical growth.On the other hand, they still are strong nodularization element, promote spheroidization of graphite, refinement matrix with synergy such as silicon, element such as strontium, molybdenum mainly eliminates stress, solve spoken parts in traditional operas, shrinkage cavity, shrinkage porosite, prevent that subsurface porosity from producing, and delays decline, especially delay decline and the stabilized matrix function of organization is given prominence to calcium barium is collaborative, copper, titanium elements strengthen the wear resistance of foundry goods, improve the flowability of molten iron, and improve casting strength.Can extensively adopt the ground square iron to produce spheroidal graphite cast iron with nodulizing agent of the present invention, the material cost 20-30% that descended, the consumption of comparing this nodulizing agent with traditional nodulizing agent reduces 10-30%, it is slow that molten iron temperature is descended, fall time reaches 30-45 minute, handle the spheroidal graphite cast iron fall time than useful traditional nodulizing agent and prolong 20-25 minute, guarantee to produce and normally carry out.The no longer capable anneal of directly handling with nodulizing agent of the present invention of spheroidal graphite casting can reach processing requirement and national standard simultaneously, reduces thermal treatment process, has saved the energy, has reduced product cost.Find also that in real work the present invention can also reduce the generation of foundry goods subsurface porosity, crackle, oxidation, bending, abnormal nodularizing in a large number, makes the scrap rate decline 15-25% of product.
Use nodulizing agent of the present invention simultaneously, the mechanical property of foundry goods also improves a lot, and through actual detected, toughness reaches 450-480, and intensity reaches 500-900.
Below in conjunction with embodiment the present invention is further described:
Embodiment 1: get the raw materials ready by following component and weight ratio:
Rare earth 2 silicon 35 magnesium 5 barium 6
Calcium 4 strontiums 0.6 bronze medal 5 iron 50
Production method of the present invention places smelting vessel after getting the raw materials ready by above-mentioned composition and weight ratio, seals to smelt, and is heated to 1450 ℃, pours in the metal trough after fully stirring and cools off, and requires to make bulk or granular, packing according to different user.
Embodiment 2: get the raw materials ready by following component and weight ratio:
Rare earth 7 silicon 40 magnesium 7 barium 4
Calcium 6 strontiums 0.8 bronze medal 3 iron 40
Titanium 0.6
Production method of the present invention places smelting vessel after getting the raw materials ready by above-mentioned composition and weight ratio, seals to smelt, and is heated to 1500 ℃, pours in the metal trough after fully stirring and cools off, and requires to make bulk or granular, packing according to different user.
Implement side 3: get the raw materials ready by following component and weight ratio:
Rare earth 5 silicon 45 magnesium 10 barium 5
Calcium 5 strontiums 1 bronze medal 2 iron 20
Molybdenum 1.5
Production method of the present invention places smelting vessel after getting the raw materials ready by above-mentioned composition and weight ratio, and sealing is smelted, and is heated to 14850 ℃, pours in the metal trough after fully stirring and cools off, and requires to make bulk or pulverizing or granular according to different user, packing.
Embodiment 4: get the raw materials ready by following component and weight ratio:
Rare earth 4 silicon 45 magnesium 6 barium 6
Calcium 5 strontiums 0.8 bronze medal 4 iron 30
Titanium 0.4 molybdenum 1
Production method of the present invention places smelting vessel after getting the raw materials ready by above-mentioned composition and weight ratio, seals to smelt, and is heated to 1460 ℃, pours in the metal trough after fully stirring and cools off, and requires to make bulk or granular, packing according to different user.
Claims (5)
1, a kind of special nodulizer for nodular cast iron and production method thereof is characterized in that: the present invention contains following component and weight ratio:
Rare earth 2-7 silicon 35-45 magnesium 5-10 barium 4-6
Calcium 4-6 strontium 0.6-1 copper 2-5 iron 20-50
2, special nodulizer for nodular cast iron according to claim 1 and production method thereof is characterized in that: the molybdenum that is added with the 1-1.5 weight part in the nodulizing agent.
3, special nodulizer for nodular cast iron according to claim 1 and production method thereof is characterized in that: the titanium that is added with the 0.4-0.6 weight part in the nodulizing agent.
4, special nodulizer for nodular cast iron according to claim 1 and production method thereof is characterized in that: be added with the molybdenum of 1-1.5 weight part in the nodulizing agent, the titanium of 0.4-0.6 weight part.
5, the production method of the described special nodulizer for nodular cast iron of claim 1 is characterized in that: mixed material is placed smelting vessel, and sealing is smelted, be heated to 1450-1500 ℃, pour in the metal trough after fully stirring and cool off, require to make bulk or granular, packing according to different user.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00113189A CN1109117C (en) | 2000-09-18 | 2000-09-18 | Special nodulizer for nodular cast iron and its production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00113189A CN1109117C (en) | 2000-09-18 | 2000-09-18 | Special nodulizer for nodular cast iron and its production process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1288969A true CN1288969A (en) | 2001-03-28 |
| CN1109117C CN1109117C (en) | 2003-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00113189A Expired - Fee Related CN1109117C (en) | 2000-09-18 | 2000-09-18 | Special nodulizer for nodular cast iron and its production process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102652967A (en) * | 2012-03-09 | 2012-09-05 | 山西银光华盛镁业股份有限公司 | Method for manufacturing high-magnesium-alloy solid cored wire |
| CN105015293A (en) * | 2015-07-16 | 2015-11-04 | 中国第一汽车股份有限公司 | Balancing suspension bracket made of ball graphite cast iron with high yield strength |
| CN108251589A (en) * | 2018-01-31 | 2018-07-06 | 重庆卡森科技有限公司 | A kind of novel nothing breeds nodulizer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1036935C (en) * | 1992-09-22 | 1998-01-07 | 陈�光 | Polycompound nodulizer for nodular cast iron |
-
2000
- 2000-09-18 CN CN00113189A patent/CN1109117C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102652967A (en) * | 2012-03-09 | 2012-09-05 | 山西银光华盛镁业股份有限公司 | Method for manufacturing high-magnesium-alloy solid cored wire |
| CN105015293A (en) * | 2015-07-16 | 2015-11-04 | 中国第一汽车股份有限公司 | Balancing suspension bracket made of ball graphite cast iron with high yield strength |
| CN108251589A (en) * | 2018-01-31 | 2018-07-06 | 重庆卡森科技有限公司 | A kind of novel nothing breeds nodulizer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1109117C (en) | 2003-05-21 |
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