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Cast iron Chia

S-Ni35 cast iron Cast iron CHN Cast iron CHN5G8 (GN8-5) S-NiSiCr30-5-5 cast iron S-NiSiCr20-5-2 cast iron S-NiMn23-4 cast iron S-NiMn13-7 cast iron S-NiCr35-3 cast iron S-NiCr30-3 cast iron S-NiCr30-1 cast iron S-NiCr20-3 cast iron S-NiCr20-2 cast iron S-Ni22 cast iron L-NiSiCr30-5-5 cast iron L-NiSiCr20-5-3 cast iron L-NiMn13-7 cast iron L-NiCuCr15-6-3 cast iron L-NiCuCr15-6-2 cast iron L-NiCr30-3 cast iron L-NiCr20-3 cast iron L-NiCr20-2 cast iron L-Ni35 cast iron

Designation

Name The value
Designation GOST Cyrillic ЧЯ
Designation GOST Latin ChJa
Transliteration ChYa
The chemical elements ZrЯ

Description

Cast iron Chia is used: for the production of castings for aircraft.

Note

Heat-resistant and acid-resistant Nickel cast iron austenitic.

Standards

Name Code Standards
Castings with special properties (cast iron and steel) В83 OST 1 90077-72

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu
OST 1 90077-72 2.5-3 ≤0.08 ≤0.3 0.5-1.2 1.5-2.5 1.5-2.5 14-17 The rest 6-8.5
Fe is the basis.
According to OST 1 90077-72, with the following mechanical properties and microstructure satisfactory, the following deviations in chemical composition are acceptable: for carbon ± 0.10%, for chromium, silicon, molybdenum, nickel and copper + 0.2% for each.

Mechanical characteristics

σB, MPa d5, % Brinell hardness number, MPa
Castings on OST 1 90077-72
≥177 ≥2 120-197

Description mechanical marks

Name Description
σB Limit short-term strength
d5 Elongation after rupture

Technological properties

Name The value
Macrostructure and contamination The appearance of the fracture of castings on OST 1 90077-72 should be dense, fine-grained, light-gray, with no signs of chill. Surface of castings shall be cleaned of sand and metal penetration. Sprues, heaving, bays, growths and veining must be cut or polished by abrasive material in the tolerances on the drawing. Nikitina, crack and end-to-end sinks are not allowed.
Microstructure According to OST 1 90077-72 microstructure of castings shall consist of austenite, phosphide-carbide eutectic, the graphite plate and the twists, evenly spaced (plate length graphite is not more than 100 microns. with wall thickness up to 20 mm. and not more than 150 MK. with wall thickness more than 20 mm).
Features of heat treatment According to OST 1 90077-72 castings are supplied without heat treatment.

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