Grade 409 (UNS S40900) in China
Apr 13, 2026
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Physical Properties
The physical properties of annealed grade 409 stainless steels are tabulated below:
Table 3 - Physical properties of annealed grade 409 stainless steels
|
Grade |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion (μm/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat 0-100°C (J/kg.K) |
Electrical Resistivity (nΩ.m) |
|||
|
0-100°C |
0-315°C |
0-538°C |
at 100°C |
at 500°C |
|||||
|
409 |
7800 |
200 |
11.0 |
11.7 |
12.4 |
25.8 |
27.5 |
460 |
600 |
Grade Specification Comparison
Table 4 provides approximate grade comparisons of 409 stainless steels:
Table 4 - Grade specifications for 409 grade stainless steel
|
Grade |
UNS No |
Old British |
Euronorm |
Swedish SS |
Japanese JIS |
||
|
BS |
En |
No |
Name |
||||
|
409 |
S40900 |
409S19 |
- |
1.4512 |
X6CrTi12 |
- |
SUH 409 |
Possible Alternative Grades
The following table gives possible alternative grades of 409 stainless steels:
Table 5 - Possible alternative grades of 409 stainless steels
|
Grade |
Properties |
|
3CR12 |
Easy to weld and good corrosion resistance. Heavy sections are more easily available when compared to 409. |
|
304 |
High heat resistance and corrosion resistance. Grade 304 is expensive. |
|
321 |
Better heat resistance when compared to 304 or 409. |
|
Aluminized steel |
Cheaper than grade 409 stainless steel, but less resistant to exhaust gases. |
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