Cast iron VCH40

Designation

Name The value
Designation GOST Cyrillic ВЧ40
Designation GOST Latin BCh40
Transliteration VCh40
By chemical elements -

Description

Cast iron VCH40 used: for the manufacture of castings for stationary steam turbines, turbine equipment, nuclear power plants, elements of steam boilers and pipelines, hydraulic turbines, hydraulic locks, and other equipment engineering: casting 2 groups, operating at temperatures up to 250 °C, exposed to high static and dynamic loads and friction (pistons, housings gears, bearing, housing, worm wheels, bushings, bearing caps, nozzles, compressors, diaphragms, frames, Foundation, frame, exhaust parts, nozzles, compressors, gears, gear); castings group 1, operating at temperatures up to 350 °C and castings exposed to high specific pressures, static, dynamic loads and friction (diaphragms, clips, part, compressors, steam turbines, valves, compressors, nozzles, diffusers, blade, bearing shells, piston rings).

Standards

Name Code Standards
Cast iron В11 GOST 7293-85
Cast iron castings (grey and malleable cast iron) В81 OST 108.962.01-85, OST 24.207.01-90

Chemical composition

Standard C S P Mn Cr Si Fe
GOST 7293-85 3.3-3.8 ≤0.02 ≤0.1 0.2-0.6 ≤0.1 1.9-2.9 Rest
Fe is the basis.
According to GOST 7293-85 the chemical composition is given for castings with wall thickness up to 50 mm inclusive. For castings with a wall thickness exceeding 50 to 100 mm, the recommended content is C = 3.00-3.50%, Si = 1.20-1.70%. For castings with a wall thickness exceeding 100 mm, the recommended content is C = 2.70-3.20%, Si = 0.50-1.50%.

Mechanical properties

sT|s0,2, MPa σU, MPa d HB, MPa
Castings on OST 1 90077-72
≥250 ≥400 ≥15 140-202

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d Elongation after rupture
HB Brinell hardness number