Other alloys · Сплав А351 Grade CT15C / SА351 Grade CT15C / N80151
Cast Alloy A351 Grade CT15C: Engineering Reference on Properties and Application
Engineering Data Sheet for Cast Alloy A351 Grade CT15C (UNS N08151)
A351 Grade CT15C (UNS N08151) is an austenitic heat-resistant cast alloy developed for the manufacture of critical components operating under high pressure and in aggressive environments. EV Group China technologists confirm its outstanding microstructural stability under cyclic temperature loads, which is a key factor for applications in oil refining, power engineering, and the chemical industry.
| Regulatory Standard | Material Classification | Key Application Areas | European Equivalent (EN) |
|---|---|---|---|
| ASTM A351 / ASME SA351 – Standard Specification for Castings, Austenitic, for Pressure-Containing Parts. | Austenitic and Austenitic-Ferritic Cast Steels | Shaped castings for pumps, shut-off valves, and fittings intended for operation under extreme temperatures. | 1.4859, GX10NiCrSiNb32-20 |
| ASTM A351 / ASME SA351 – Standard Specification for Castings, Austenitic, for Pressure-Containing Parts. | Austenitic and Austenitic-Ferritic Cast Steels | Shaped castings for pumps, shut-off valves, and fittings intended for operation under extreme temperatures. | 1.4859, GX10NiCrSiNb32-20 |
Chemical Composition of A351 Gr. CT15C Alloy according to ASTM A351, %
The alloying complex of grade CT15C, balanced with high nickel (31.0–34.0%) and chromium (19.0–21.0%) content, is purposefully reinforced with niobium to suppress intergranular corrosion and ensure high heat resistance. The EV Group China laboratory conducts strict spectral analysis of each melt to guarantee compliance of the chemical composition with standard requirements.
| C | <0.05–0.15 |
|---|---|
| Si | <0.50–1.50 |
| Mn | <0.15–1.50 |
| P | <0.03 |
| S | <0.03 |
| Cr | 19.0–21.0 |
| Ni | 31.0–34.0 |
| Nb | 0.5–1.5 |
| Fe | Remainder |
Mechanical Properties of A351 Grade CT15C Castings at Room Temperature
The mechanical properties of the alloy ensure the integrity and durability of loaded equipment components. Normalized minimum values according to ASME SA 351 specification, determined on samples after heat treatment, are listed below.
| Tensile Strength, min., MPa | Yield Strength (0.2% offset), min., MPa | Elongation after fracture, min., % |
|---|---|---|
| 435 | 170 | 20 |
Key Physical Properties
The nominal density of A351 Gr CT15C alloy is 8.01 g/cm³. This parameter is fundamental for accurate strength and weight calculations in the design of piping systems, high-pressure vessels, and other process equipment.
Technological Properties and Weldability
CT15C material has good weldability, which allows for the formation of complex welded structures without the risk of hot cracking, provided the technology is followed. Classification according to key international welding standards confirms its suitability for production and assembly operations.
| Weldability Classification by Standards | ASTM A488 Standard | ISO 15608 Standard | ASME Section IX | |
|---|---|---|---|---|
| Weldability Classification by Standards | Category 11 | Group 45 | Welding Group (P-Number) | Brazing Group (P-Number) |
| Weldability Classification by Standards | Category 11 | Group 45 | 45 | 111 |
International Equivalents and Cross-References for CT15C Grade
| Germany (DIN / W-Nr.) | Japan (JIS) | United Kingdom (BS) | USA (ASTM / ASME) | China (GB) |
|---|---|---|---|---|
| GX 10 NiCrNb 32-20, G-X 10NiCrNb 32 20, GX 10 NiCrSiNb 32-20 | SCH 34 | GX10NiCrNb32-20 | A297 Grade CT15C, 46Fe-32Ni | C53961, ZG10Ni31Cr20Nb1 |