GOST9941-81 12X18H12T Seamless Boiler Tube, Russian Standard, High Nickel Content,TY-14-3P-55-2001
GOST 9941-81 12X18H12T seamless pipe is a titanium-stabilized austenitic stainless steel seamless pipe under the Russian standard. It is widely used in chemical, power, and other fields requiring high-temperature and corrosive environments due to its excellent corrosion resistance and high-temperature resistance. Although this standard has been superseded by GOST 9941-2022, it is still widely recognized and used in actual trade and engineering.
Material grade: 12X18H12T. This is an austenitic grade stainless steel. Its core characteristic is the addition of titanium (Ti) as a stabilizing element to prevent intergranular corrosion during welding or high-temperature service.
Its international equivalent is mainly AISI 321, but there are significant differences. 12X18H12T has a nickel content as high as 11%, resulting in a much higher price in addition to performance differences.
| GOST 9941-81 12X18H12T Chemical Composition (Mass Fraction, %) |
| Element |
Composition (% by weight) |
| Carbon (C) |
≤ 0.12 |
| Silicon (Si) |
≤ 0.8 |
| Manganese (Mn) |
≤ 2.0 |
| Chromium (Cr) |
17.0 – 19.0 |
| Nickel (Ni) |
11.0 – 13.0 |
| Titanium (Ti) |
5×C% to 0.70 |
| Sulfur (S) |
≤ 0.020 |
| Phosphorus (P) |
≤ 0.035 |
| Iron (Fe) |
Balance |
| GOST 9941-81 12X18H12T Mechanical Properties |
| Property |
Value |
| Tensile Strength (min.) |
≥ 510 – 549 MPa |
| Yield Strength (0.2% offset, min.) |
≥ 196 – 235 MPa |
| Elongation (min.) |
≥ 35% |
| Heat Treatment |
Solution Anneal |
Applications:
- Chemical and Petroleum Industry: Widely used in the manufacture of heat exchangers, condensers, and reaction equipment, capable of withstanding various corrosive chemicals.
- Power and Energy Sector: Used in steam boilers, power plant cooling systems, and some equipment in nuclear power plants, capable of operating continuously in a temperature range of -196°C to +600°C.
- Marine Engineering: Used in the manufacture of marine heat exchangers and pipes, resistant to seawater corrosion.
- Other Industries: Includes equipment in food processing, and water treatment industries requiring hygiene and corrosion resistance.
