Cast iron SCH30

Designation

Name The value
Designation GOST Cyrillic СЧ30
Designation GOST Latin CCh30
Transliteration SCh30
By chemical elements -

Description

Cast iron SCH30 used: for the manufacture of various castings for critical applications wear resistant and high strength of parts with the lowest allowable wall thickness of 20 mm blocks and cylinder heads, liners, flywheels liners, jaw couplings, gears, worm wheels and parts in mechanical engineering, working under pressure above 7.5 MPa (75 kgf/cm2); the frame gear train of the rolling mills; critical parts working in compression (Bashmakov, columns) in the construction; heavy-duty parts with large variations in cross-sections as well as boilers for melting caustic soda, pipes, the knees and other parts in chemical engineering, working in solutions and melts of alkalies; casting 2 groups for stationary steam turbines, turbine equipment, nuclear power plants, elements of steam boilers and pipelines, hydraulic turbines, hydraulic valves and other equipment power plant engineering, operating at temperatures up to 250 °C, exposed to high static and dynamic loads and friction (pistons, housings, bearing housings, housings worm wheels, bushings, bearing caps, nozzles, compressors, diaphragms, frames, Foundation, frames, exhaust parts, compressor pipes, gear wheels, gear); casting parts of valves and actuators to it; cast connecting parts for pipelines.

Standards

Name Code Standards
Cast iron В11 GOST 1412-85, STP М319-95
Pipes of ferrous metals and alloys, cast fittings to them В61 GOST 5525-88, GOST 9583-75
Cast iron castings (grey and malleable cast iron) В81 OST 108.962.01-85, OST 24.207.01-90, OST 23.4.258-86, OST 23.4.117-84, TU 1-812-0072-94

Chemical composition

Standard C S P Mn Cr Si Fe
GOST 1412-85 3-3.2 ≤0.12 ≤0.2 0.7-1 - 1.3-1.9 Rest
STP М319-95 2.8-3.2 ≤0.12 ≤0.2 0.7-1 ≤0.3 1.5-2 Rest
Fe is the basis.
According to GOST 1412-85, low alloying of cast iron by various elements (chromium, nickel, copper, phosphorus, etc.) is allowed.

Mechanical properties

Section, mm σU, MPa HB, MPa
Approximate data on the time resistance to tensile and hardness in the walls of castings according to GOST 1412-85, STP М319-95
15 ≥300 ≤260
Castings in cast or heat treated condition for STP М319-95
- ≥300 181-255
Approximate data on the time resistance to tensile and hardness in the walls of castings according to GOST 1412-85, STP М319-95
150 ≥180 ≤163
Part of the connecting piping (sand casting) according to GOST 5525-88 (NV - in the center of a wall)
- ≥150 ≤250
Approximate data on the time resistance to tensile and hardness in the walls of castings according to GOST 1412-85, STP М319-95
30 ≥260 ≤250
50 ≥220 ≤197
8 ≥330 ≤270
80 ≥195 ≤187

Description mechanical marks

Name Description
σU Limit short-term strength
HB Brinell hardness number

Physical characteristics

Temperature Е, HPa r, kg/m3 l, W/(m · °C) С, J/(kg · °C)
20 120-145 7300 46 525

A description of the physical symbols

Name Description
Е The normal elasticity modulus
l Coefficient of thermal conductivity

Technological properties

Name The value
Microstructure Perlite or pearlitic-ferritic, ferrite not more than 20%. Graphite plate, small and medium.