Products

304 Series

FEATURES AND USAGE AREAS

304 is the most common type of steel. It is well known for its corrosion resistance, resistance to temperature, low temperature resistance and mechanical properties. The pullability is very good as it is deep drawn and twisted. It has not been hardened by heat treatment. (Not magnetic, operating range -196 ~ + 800 ° C)

It is used in kitchen equipments, in households, in internal pipelines, in hot water boilers, in bathtubs, in pressure vessels, in automobile parts (wiper, silencer etc.), in medical equipments, building materials, chemical plants, milk and food industry, ship parts.

CHEMICAL COMPOSITION
C Mn P S CR
304 0.08 max 2.0 max 0.045 max 0.030 max 1.0 max 18.0 to 20.0 8.0 to 10.50
304L 0.03 max 2.0 max 0.045 max 0.030 max 1.0 max 18.0 to 20.0 8.0 to 12.0
MECHANICAL PROPERTIES (ROOM TEMPERATURE)
304 304L
Typical Min Typical Min
Tensile strength 
600 515 590 485
Yielding strength 
310 205 310 170
Elongation 
60 40 60 40
Hardness 
170 - 170 -
Fatigue strength 
240 - 240 -
SPECIFICATIONS WITH HIGH TEMPERATURES
Heat °C 600 700 800 900 1000
Tensile strength 
380 270 170 90 50
Ductility  FEATURES
Heat °C 550 600 650 700 800
Tensile MPa* 120 80 50 30 10
*For 1% elongation at 10,000 hours
RECOMMENDED MAX. OPERATING TEMPERATURE*
Continuous operation925 °C
Intermittent operation
850 °C
*Oxide units /
Features below zero
Heat °C -78° -161° -196°
Tensile strength
1100 / 950 300 / 180 180 / 175
Yielding strength 
1450 / 1200 380 / 220 160 / 160
Impact resistance
1600 / 1350 400 / 220 155 / 150
Corrosion Strength (CONTACT WITH LIQUID)
Heat °C 20° 80°
Concentration (%Bulk) 10 20 40 60 80 100 10 20 40 60 80 100
Sulfuric acid
2 2 2 2 1 0 2 2 2 2 2 2
Nitric acid
0 0 0 0 2 0 0 0 0 0 1 2
Phosphoric acid
0 0 0 0 0 2 0 0 0 0 1 2
Formic acid
0 0 0 0 0 2 0 1 2 2 1 0
0 = durable-corrosion rate less than 100 μ / year
1 = partially resistant - less than 1000 μ / year corrosion rate
2 = non-durable-corrosion rate greater than 1000 μ / year
ATMOSPHERIC MEDIA
Corrosion Amount304 Aluminium-3S Mild Steel
Terrestrial
0.0025 0.025 5.8
Sea 0.0076 0.432 34.0
Sea-industrial
0.0076 0.686 46.2
In this table the corrosion performance of the 304 tip metal is compared to other materials in different environmental conditions.
Corrosion rates are based on a 10 year period.