AISI 444 is a low carbon, dual stabilised, molybdenum containing ferritic stainless steel with good ductility, toughness and resistance to sensitisation, even in the welds. With 18% chromium and 2% molybdenum, the steel has good pitting resistance and crevice corrosion resistance, similar to CS316 and good general corrosion resistance and oxidation resistance, similar to 316 in most environments. Being a ferritic stainless steel, AISI 444 is not susceptible to Stress Corrosion Cracking. Annealed AISI 444 is ductile and can be formed using a wide range of roll forming or mild stretch bending operations as well as the more common drawing and bending operations. AISI 444 does not harden excessively during cold working.
Characteristics
> Excellent resistance to chloride pitting and crevice corrosion cracking
> Immune to Chloride ion stress corrosion
> Maintains high strength at elevated temperatures
> Resistant to sea water, in both flowing and stagnant condition
>Heat resistant
Applications
> Marine engineering
> Furnaces a gas turbines
>Chemical processing plants
> Boiler a pressure vessels
> Nuclear power plants
Equivalent
| Euronorm | Nom. | AISI / ASTM / UNS |
| 1.4521 | X2CrMoTi18-2 | 444 |
Chemical Composition
| Type | C | Mn | Si | P | S | Cr | Mo | Ni | Nb | Ti |
| 444 | 0.025 max | 1.00 max | 1.00 max | 0.040 max | 0.030 max | 71.5-19.50 | 1.75-2.50 | 1 | 1 | 0.20+4(C+N) 0.80 |
Smelting Option
1 EAF: Electric Arc Furnace
2 EAF+LF+VD: Refined-smelting and vacuum degassing
3 EAF+ESR: Electro Slag Remelting
4 EAF+PESR: protective atmosphere Electro Slag Remelting
5 VIM+PESR: Vacuum induction melting
Forming Option
1 Hot rolling process
2 Hot Forging: Electro-hydraulic; High-speed-hydraulic; Oil-hydraulic; Precision-forging
Heat-treatment Option
1 +A: Annealed (full/soft/spheroidizing)
2 +N: Normalized
3 +NT: Normalized and tempered
4 +QT: Quenched and tempered (water/oil)
5 +AT: Solution annealed
6 +P: Precipitation hardened
Suface Option
1 Black Surface
2 Grounded: Bright but rough ; Not precision
3 Machining for plate: Bright and precision; Little turning scar
4 Peeled/Turned: Bright and precision; Little turning scar
5 Polished: Very Bright and precision size; Not turning scar
Other Services
1 Cutting: Small pieces
2 CNC Machine: Produce as your drawing
3 Package: Bare/Nylon/Canvas/Wooden
4 Payment:T/T, L/C, O/A(request credit)
5 Transport:FOB/CFR/CIF/DDU/DDP (train/ship/Air)
Mechanical Properties
| Type | Product Form | 0.2% Proof Stress (Mpa) | Tenstile Strength (Mpa) | Elongation (%) | Brinell Hardness |
| 444 | C | 275 min | 415 min | 20 min | 217 |
Delivery Condition
Stress Relieved Annealed
Bright Annealed
Normalized
Solution Treatment
CORROSION RESISTANCE
Type 444 provides excellent corrosion resistance in moderately severe environments of many types that include chlorides and organic acids found in foods and beverages. It also provides satisfactory resistance to dilute sulfuric acid solutions and to highly concentrated sodium hydroxide.
FORMABILITY
Type 444 provides excellent formability and can be readily deep drawn and spin formed. Stretch forming, however, is limited in application for this material.
WELDABILITY
The ferritic class of stainless steels is generally considered to be weldable by the common fusion and resistance techniques.
