AISI 446 UNS S44600 Stainless Steel Seamless Tube / Thermocouple Protection Tube
AISI 446 UNS S44600 Stainless Steel Seamless Tube / Thermocouple protection tube
S44600 is a ferritic, stainless chromium steel for use in high-temperature applications such as
recuperators in the metallurgical and glass industries and thermocouple protection tubes.
The stainless AISI 446 grade is especially suitable for sulfurous flue gas atmospheres and can be used
at temperatures up to 1100°C (2010°F), depending on the service parameters and application.
The ferritic structure of 446 stainless also gives it good resistance to extremely corrosive metal melts,
such as copper, tin and lead.
Extremely good resistance to reducing sulphurous gases
The grade's extremely good resistance to reducing sulfudizing gases and salts, compared with austenitic stainless steels,
is due to the high chromium content and absence of nickel.
446 stainless also exhibits excellent resistance to isothermal and cyclic oxidation in air.
Main characteristics of 446 stainless steel seamless tubes
- Extremely good resistance to reducing sulfurous combustion gases
- Very good resistance to oxidation in air
- Good resistance to oil-ash corrosion
- Good resistance to molten copper, lead and tin
Typical applications for high temperature ferritic grade 446 stainless are:
- Recuperators in the metallurgical and glass industries
- Thermocouple protection tubes
- Sootblower tubes
- Injection nozzles
- Muffle tubes in continous wire annealing furnaces
Grade designation
| AISI | UNS | EN | DIN | Chemical composition % weight |
| ASTM 446-1 | S44600 | 1.4749 | X18CrN28 | C 0.20 max, Si 1.00 max, Mn 1.50 max, P 0.040 max, S 0.030 max, Cr 23.0~27.0, Ni 0.75 max, N 0.25 max |
Product standards
ASTM A268 Specification for Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
EN 10297-2 Seamless steel tubes for mechanical and general engineering purposes
SS 14 23 22
Forms of supply
Stainless steel seamless tube and pipe, annealed, pickled / bright polished
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Stainless martensitic • precipitation hardening steel • stainless ferritic — Our answer to your needs
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