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Foundry iron

Что-то еще 4 лет назад
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Описание

Foundry iron.

The cast iron, representing material for steel and iron manufacturing, also used for direct manufacturing of finished products through casting into sand moulds.

For latter purpose there is used the so-called foundry iron that shall satisfy the following requirements: it shall be readily fusible, in order to be possible to make more accurate shape at relevantly low temperatures; it shall give solid and not foamy castings; it shall ensure inconsiderable volume changes at the product setting. In addition, according to its intended use, the cast iron shall ensure castings of the required hardness, strength and tension.

As to the structure there are distinguished white iron (with white fracture), where the carbon exists in the form of cement carbide, and grey iron (with grey fracture), where the carbon exists in general in the form of graphite. Grey iron is divided into the foundry-iron, nodular, malleable, heat-resisting, heat-resistant, corrosion resistant and bearing cast iron.

As secondary product (at repeated casting), the foundry iron is used as foundry alloy. It easily processed by cutting, generating ideal surface. It is supplied in castings and moulds.

The foundry iron is intended for its further usage in iron foundries at production of various castings. The foundry iron is made of grades L1 – L6; their usage depends on various purposes according to the properties. The quality of cast iron is characterized by small quantity of additives and stable chemical composition. The foundry iron is well processed and used almost in all the sectors of industry. For example, it is widely used in machine building. The pig iron is intended for further processing into steel or recasting in iron foundries at castings production.

Depending on purpose there are manufactured the grades L1, L2, L3, L4, L5, L6, as well as refined with magnesium grades LR1, LR2, LR3, LR4, LR5, LR6.

GOST 4832-95. Iron grade. Si, % Mn, % P, not to exceed % S, not to exceed %
Group Classes Category
1 2 3 4 А B C 1 2 3 4 5
L1 3,2-3,6 to 0,3 inclusive 0,3-0,5 0,5-0,9 0,9-1,5 0,08 0,12 0,3 0,02 0,03 0,04 - -
L2 2,8-3,2 to 0,3 inclusive 0,3-0,5 0,5-0,9 0,9-1,5 0,08 0,12 0,3 0,02 0,03 0,04 - -
L3 2,4-2,8 to 0,3 inclusive 0,3-0,5 0,5-0,9 0,9-1,5 0,08 0,12 0,3 0,02 0,03 0,04 - -
L4 2,0-2,4 to 0,3 inclusive 0,3-0,5 0,5-0,9 0,9-1,5 0,08 0,12 0,3 0,02 0,03 0,04 0,05 -
L5 1,6-2,0 to 0,3 inclusive 0,3-0,5 0,5-0,9 0,9-1,5 0,08 0,12 0,3 0,02 0,03 0,04 0,05 -
L6 1,2-1,6 to 0,3 inclusive 0,3-0,5 0,5-0,9 0,9-1,5 0,08 0,12 0,3 0,02 0,03 0,04 0,05 -

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