303 Stainless Steel
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Composition Typical compositional ranges for grade 303 stainless steels are given in table 1. Table 1. Composition ranges for 303 grade stainless steel Grade C Mn Si P S Cr Mo Ni Se 303 min. max. - 0.15 - 2.00 - 1.00 - 0.20 0.15 - 17.0 19.0 - 8.0 10.0 - 303Se min. max. - 0.15 - 2.00 - 1.00 - 0.20 0.06 - 17.0 19.0 - 8.0 10.0 0.15 min Mechanical Properties Typical mechanical properties for grade 303 stainless steels are...
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Composition
Typical compositional ranges for grade 303 stainless steels are given in table 1.
Table 1. Composition ranges for 303 grade stainless steel
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
Se |
|
|
303 |
min. max. |
- 0.15 |
- 2.00 |
- 1.00 |
- 0.20 |
0.15 - |
17.0 19.0 |
- |
8.0 10.0 |
- |
|
303Se |
min. max. |
- 0.15 |
- 2.00 |
- 1.00 |
- 0.20 |
0.06 - |
17.0 19.0 |
- |
8.0 10.0 |
0.15 min |
Mechanical Properties
Typical mechanical properties for grade 303 stainless steels are given in table 2.
Table 2. Mechanical properties of 303 grade stainless steel
|
Grade |
Tensile Strength (MPa) |
Yield Strength 0.2% Proof (MPa) |
Elongation (% in 50mm) |
Hardness |
|
|
Rockwell B (HR B) |
Brinell (HB) |
||||
|
303 |
- |
- |
- |
- |
262 max |
Physical Properties
Typical physical properties for annealed grade 303 stainless steels are given in table 3.
Table 3. Physical properties of 303 grade stainless steel in the annealed condition
|
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 |
|||||
|
303 |
8027 |
193 |
17.3 |
17.8 |
18.4 |
16.3 |
21.5 |
500 |
720 |
Grade Specification Comparison
Approximate grade comparisons for 303 stainless steels are given in table 4.
Table 4. Grade specifications for 303 grade stainless steel
|
Grade |
UNS No |
Old British |
Euronorm |
Swedish SS |
Japanese JIS |
||
|
BS |
En |
No |
Name |
||||
|
303 |
S30300 |
303S31 |
58M |
1.4305 |
X8CrNiS18-9 |
2346 |
SUS 303 |
|
303Se |
S30323 |
303S42 |
- |
- |
- |
- |
SUS 303Se |
| These comparisons are approximate only. The list is intended as a comparison of functionally similar materials notas a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted. | |||||||
Possible Alternative Grades
Possible alternative grades to grade 303 stainless steels are given in table 5.
Table 5. Possible alternative grades to 303 grade stainless steel
|
Grade |
Why it might be chosen instead of 303 |
|
304 |
Better corrosion resistance, formability or weldability are needed, at the expense of lower machinability. |
|
316 |
Higher resistance to pitting and crevice corrosion is required, in chloride environments. A lower machinability can be accepted. |
|
416 |
Even higher machinability than 303 is needed, and a lower corrosion resistance can be tolerated.
Or hardening by thermal treatment is required, while maintaining a high machinability. |
Corrosion Resistance
Good resistance to mildly corrosive atmospheres, but significantly less than Grade 304 due to the sulphur addition; the sulphide inclusions act as pit initiation sites. Grade 303 should not be exposed to marine or other similar environments, as these will result in rapid pitting corrosion. Because the sulphide inclusions in 303 are primarily aligned along the rolling direction the corrosion resistance is particularly reduced in cross-sections.
Grade 303, like other common austenitic stainless steels, is subject to stress corrosion cracking in chloride containing environments above about 60°C.
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