What material is 1.4404 equivalent to?
The stainless steel grade 1.4404 is equivalent to AISI 316L and UNS S31603. It's sometimes referred to as X2CrNiMo17-12-2. Due to the addition of molybdenum, its corrosion resistance is superior to that of the austenitic steels AISI 304/1.4301 and AISI 304L/1.4307. Therefore, AISI 316L/1.4404 stainless steel is commonly used in the food industry. This material resists intergranular corrosion up to 300°C, even in continuous operation, but is not resistant to salt or seawater.
1.4404 stainless steel Product Type
chemical composition of stainless steel AISI 316L / 1.4404
|
C |
Si |
Mn |
P |
S |
N |
Cr |
Cu |
Mo |
Ni |
Ti |
|---|---|---|---|---|---|---|---|---|---|---|
|
≤ 0,03 |
≤ 1,00 |
≤ 2,00 |
≤ 0,045 |
≤ 0,03 |
≤ 0,10 |
16,5 - 18,5 |
- |
2,00 - 2,50 |
10,0 - 13,0 |
- |
physical Properties
| Property | Value |
|---|---|
| Magnetisability | low |
| Density (kg/dm³) | 8.0 |
| Thermal conductivity (at up to 20°C) | 15 |
| Electronic resistance at room temperature (in Ω mm²/m) | 0.75 |
| Specific heat capacity at 20°C (in J/(kg·K)) | 500 |
Mechanical Properties
(Values refer to diameter ranges: ≤ 160 mm and 160 < d ≤ 250 mm*)
| Property | Value |
|---|---|
| Hardness (HB) | ≤ 215 |
| Yield strength Rp0.2 (MPa) | ≥ 200 |
| Yield strength Rp1.0 (MPa) | ≥ 235 |
| Tensile strength Rm (MPa) | 500 - 700 |
| Elongation at break A (longitudinal, % for ≤ 160 mm) | ≥ 40 |
What is the yield strength of 1.4404 stainless steel in the solution annealed condition?
|
Temp in °C |
100 |
150 |
200 |
250 |
300 |
350 |
400 |
450 |
500 |
550 |
|---|---|---|---|---|---|---|---|---|---|---|
|
Rp1,0 in MPa |
≥ 200 |
≥ 180 |
≥ 165 |
≥ 153 |
≥ 145 |
≥ 139 |
≥ 135 |
≥ 130 |
≥ 128 |
≥ 127 |
|
Rp0,2 in MPa |
≥ 165 |
≥ 150 |
≥ 137 |
≥ 127 |
≥ 119 |
≥ 113 |
≥ 108 |
≥ 103 |
≥ 100 |
≥ 98 |
Corrosion Resistance
AISI 316L stainless steel (1.4404 / X2CrNiMo17-12-2) exhibits excellent corrosion resistance in natural environments containing low to moderate concentrations of chloride and salt, with a PREN value (pitting resistance equivalent value) ranging from 23.1 to 28.5.
Weldability
AISI 316L stainless steel (corresponding to grade 1.4404 / X2CrNiMo17-12-2) offers excellent weldability and is suitable for all common welding methods except gas welding. No additional filler metal or post-weld heat treatment is generally necessary, and the welding process does not negatively impact its resistance to intergranular corrosion.
Machinability
AISI 316L stainless steel has average machinability. Compared to AISI 316/1.4401, its lower carbon content provides improved machinability.
What is the difference between 1.4404 and 1.4435 stainless steel?
1.4435 (316LMo) Stainless Steel usually compeared with 316L (1.4404) stainless steel grade. 1.4435 material has a higher content of chromium, nickel and molibdenium and because of these elements, it is more resistant to corrosion then 316L (1.4404) grade.