Cast iron SCH30
Designation
| Name |
The value |
| Designation GOST Cyrillic |
СЧ30 |
| Designation GOST Latin |
CCh30 |
| Transliteration |
SCh30 |
| The 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 from ferrous metals and alloys cast and connecting parts to them |
В61 |
GOST 5525-88, GOST 9583-75 |
| Castings of cast iron (gray 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 |
The rest |
| STP М319-95 |
2.8-3.2 |
≤0.12 |
≤0.2 |
0.7-1 |
≤0.3 |
1.5-2 |
The 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 characteristics
| Section, mm |
σB, MPa |
Brinell hardness number, 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 |
| Section |
Section |
| σB |
Limit short-term strength |
Physical characteristics
| Temperature |
Е, ГПа |
r, кг/м3 |
l, Вт/(м · °С) |
С, Дж/(кг · °С) |
| 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. |
