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Stainless steel 304 also known as 1.4301 respectively. Type 304 is the most versatile and widely used stainless steel.
It is still sometimes referred to by its old name 18/8 which is derived from the nominal composition of type 304 being 18% chromium and 8% nickel.

Chemical Composition
Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
304 | min. | - | - | - | - | - | 18.0 | - | 8.0 | - |
Mechanical Properties
Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50 mm) min | Hardness | |
Rockwell B (HR B) max | Brinell (HB) max | ||||
304 | 515 | 205 | 40 | 92 | 201 |
Physical Properties
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 | |||||
304/L/H | 8000 | 193 | 17.2 | 17.8 | 18.4 | 16.2 | 21.5 | 500 | 720 |

Equivalent Grade
Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
BS | En | No | Name | ||||
304 | S30400 | 304S31 | 58E | 1.4301 | X5CrNi18-10 | 2332 | SUS 304 |
Possible Alternative Grades
Grade | Why it might be chosen instead of 304 |
301L | A higher work hardening rate grade is required for certain roll formed or stretch formed components. |
302HQ | Lower work hardening rate is needed for cold forging of screws, bolts and rivets. |
303 | Higher machinability needed, and the lower corrosion resistance, formability and weldability are acceptable. |
316 | Higher resistance to pitting and crevice corrosion is required, in chloride environments |
321 | Better resistance to temperatures of around 600-900 °C is needed…321 has higher hot strength. |
3CR12 | A lower cost is required, and the reduced corrosion resistance and resulting discolouration are acceptable. |
430 | A lower cost is required, and the reduced corrosion resistance and fabrication characteristics are acceptable. |
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