Materials used in metallurgy

Grey cast iron ГОСТ1412-85 С410 -С435; (DIN1691 GG10-GG35; ASTMA48 20B-50B) is the technological material with good fluidity, less inclination to landing shells, usable to produce casts of complex configuration with 2-500-mm-wide walls and with the following mechanical properties: tensile strength of 100 MPa-350 MPa.

High-duty cast irons with spherical graphite ГОСТ7293-85 В435-В4100 are used to produce many kinds of critical parts, substitutional steel alloys made by forging and casting with tensile strength of 100-350 MPa and specific elongation of 22-2%.

Heat-proof cast irons (alloyed irons) ГОСТ7769-82 4Ч1Б 4Ч2Б 4Ч3Б 4С5 ... – they are characterized by heat-resistance, scale resistance, wear resistance, noncorrodibility.

Bearing cast iron ГОСТ 1585-85 А4С is used in the units of wear bearings.

Chemical coating

Cadmium-plating is resistant to sea water and atmospheric influence; used to cover critical screws and high-precision parts of machines, instruments and mechanisms.

Copperization is used to increase electrical conductivity, during multi-layer protection and decorative coating and polygraphic printing.

Chromium coating is a protecting and decorative kind of coating used to restore the part dimensions, to increase chemical and mechanical resistance under pressure and heating and to increase wear resistance of the parts operating under friction.

Blanching is used to coat electrical instruments (copper, steel, copper alloys), apparatus and mechanisms by soldering and to protect electric contacts (copper and copper alloys) against corrosion.

Galvanization is used to protect small bolted parts, nails, brackets against the atmospheric influence.

Browning is used to protect the oiled items of arms against corrosion in atmospheric conditions.

Nondestructive control