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GGG70L nodular cast iron and preparation method thereof

A technology of nodular cast iron and molten iron, which is applied in the field of cast iron production, can solve problems such as low hardness, product scrapping, and pearlite content lower than the standard requirements, and achieve the effect of strengthening quenching hardness and reducing product scrapping

Active Publication Date: 2018-09-28
HEBEI SHUOKAI CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The technical problem to be solved by the present invention is to provide a GGG70L ductile iron made of German ductile iron, which is mainly used in the production of GGG70L ductile iron in the drawing process of automobile panels. According to the existing alloy addition ratio, GGG70L ductile iron exceeding 8 tons It often occurs that the pearlite content is lower than the standard requirement, that is, less than 85%, causing the hardness of GGG70L ductile iron to be lower than 50HRC after quenching, and in severe cases, the product will be scrapped

Method used

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  • GGG70L nodular cast iron and preparation method thereof
  • GGG70L nodular cast iron and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A GGG70L ductile iron, including the following raw materials by weight: pig iron: 1000kg, furnace charge: 1500kg, scrap steel: 4000kg, molybdenum: 45kg, copper: 90kg, nickel: 90kg, tin: 1.5kg, nodulizer: 120kg, inoculation Dosage: 30kg.

[0031] The manufacturing steps of the above-mentioned GGG70L ductile iron include:

[0032] (1) Smelting: Add pig iron with a weight of 1000kg, 1500kg nodular iron return charge, and 4000kg scrap steel in the electric furnace, and the electric furnace is heated to 1400-1500°C, and the mixture of the pig iron, nodular iron return charge and scrap steel is smelted into molten iron .

[0033] (2) Adjusting the composition content of molten iron: through the analysis in front of the furnace, the weight percentage of the chemical composition in the molten iron obtained in step (1) is adjusted to the following ranges: C: 3.1-3.6%, Si: 1.0-1.5%, Mn: 0.45-0.55 %, P: 0.055-0.065%, S: 0.005-0.015%, Cr: 0.05-0.15%.

[0034] (3) Adding alloy el...

Embodiment 2

[0039] A GGG70L ductile iron, including the following raw materials by weight: pig iron: 2000kg, return material: 2000kg, scrap steel: 5000kg, molybdenum: 50kg, copper: 95kg, nickel: 95kg, tin: 2kg, nodulizer: 125kg, inoculant : 45kg.

[0040]The manufacturing steps of the above-mentioned GGG70L ductile iron include:

[0041] (1) Smelting: Add pig iron with a weight of 2000kg, 2000kg nodular iron return charge, and 5000kg scrap steel in the electric furnace, and the electric furnace is heated to 1490-1500°C, and the mixture of the pig iron, nodular iron return charge and scrap steel is smelted into molten iron .

[0042] (2) Adjusting the composition content of molten iron: through the analysis in front of the furnace, the weight percentage of the chemical composition in the molten iron obtained in step (1) is adjusted to the following ranges: C: 3.5-3.7%, Si: 1.5-2.4%, Mn: 0.52-0.57 %, P: 0.028-0.035%, S: 0.007-0.009%, Cr: 0.11-0.13%.

[0043] (3) Adding alloying elements:...

Embodiment 3

[0048] A GGG70L ductile iron, including the following raw materials by weight: pig iron: 3000kg, return material: 2500kg, scrap steel: 6000kg, copper: 100kg, nickel: 100kg, molybdenum: 55kg, tin: 2.5kg, nodulizer: 130kg, inoculation Dosage: 60kg.

[0049] The manufacturing steps of the above-mentioned GGG70L ductile iron include:

[0050] (1) Smelting: Add pig iron with a weight of 3000kg, 2500kg nodular iron return charge, and 6000kg scrap steel in the electric furnace, and the electric furnace is heated to 1490-1500°C, and the mixture of the pig iron, nodular iron return charge and scrap steel is smelted into molten iron .

[0051] (2) Regulating the composition content of molten iron: through the analysis in front of the furnace, the weight percentage of the chemical composition in the molten iron obtained in step (1) is adjusted to the following ranges: C: 3.7-4.0%, Si: 1.5-2.2%, Mn: 0.57-0.65 %, P: 0.055-0.065%, S: 0.008-0.012%, Cr: 0.12-0.17%.

[0052] (3) Adding allo...

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Abstract

The invention discloses GGG70L nodular cast iron and a preparation method thereof, and belongs to the technical field of cast iron production. The GGG70L nodular cast iron comprises the following chemical components of, by weight, 3.4-3.8% of C, 2.0-2.4% of Si, 0.5-0.6% of Mn, 0.06% of P or the less, 0.01% of S or the less, 0.45-0.55% of Mo, 0.9-1.0% of Cu, 0.9-1.0% of Ni, 0.04-0.06% of Mg, 0.015-0.025% of Sn, 0.1-0.15% of Cr and the balance Fe. The GGG70L nodular cast iron is added according to the existing alloy ratio, when a casting is more than 8 tons, the content of pearlite in the core can also reach 85% or more, and it is guaranteed that the hardness of the quenched casting is larger than 55 HRC.

Description

technical field [0001] The invention relates to the technical field of cast iron production, in particular to a GGG70L ductile iron and a preparation method of the GGG70L ductile iron. Background technique [0002] The technical problem to be solved by the present invention is to provide a GGG70L ductile iron made of German ductile iron, which is mainly used in the production of GGG70L ductile iron in the drawing process of automobile panels. According to the existing alloy addition ratio, GGG70L ductile iron exceeding 8 tons It often occurs that the pearlite content is lower than the standard requirement, that is, lower than 85%, causing the hardness of GGG70L ductile iron to be lower than 50HRC after quenching, and in severe cases, the product will be scrapped. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a kind of GGG70L ductile iron, comprising the following chem...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C37/08C22C33/08C21C1/10C21D1/26C21D5/00
Inventor 武元蛟邢欣欣
Owner HEBEI SHUOKAI CASTING
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