Alloy 304/304L Stainless Steel

Lowest Temperature (°F) at Which the Corrosion Rate Exceeds 5mpy

CORROSION ENVIRONMENT	Type 304	Type 316L	2205 (UNS S32205)	2507
0.2% Hydrochloric Acid	>Boiling	>Boiling	>Boiling	>Boiling
1% Hydrochloric Acid	86p	86	185	>Boiling
10% Sulfuric Acid	—	122	140	167
60% Sulfuric Acid	—	<54	<59	<57
96% Sulfuric Acid	—	113	77	86
85% Phosphoric Acid	176	203	194	203
10% Nitric Acid	>Boiling	>Boiling	>Boiling	>Boiling
65% Niitric Acid	212	212	221	230
80% Acetic Acid	212p	>Boiling	>Boiling	>Boiling
50% Formic Acid	≤50	104	194	194
50% Sodium Hydroxide	185	194	194	230
83% Phosphoric Acid + 2% Hydrofluoric Acid	113	149	122	140
60% Nitric Acid + 2% Hydrocloric Acid	>140	>140	>140	>140
50% Acetic Acid + 50% Acetic Anhydride	>Boiling	248	212	230
1% Hydrochloric Acid + 0.3% Ferric Chloride	68p	77p	113ps	203ps
10% Sulfuric Acid + 2000ppm Cl- + N2	—	77	95	122
10% Sulfuric Acid + 2000ppm Cl- + SO2	—	<<59p	<59	104
WPA1, High Cl- Content	<<50	≤50	113	203
WPA2, High F- Content	<<50	≤50	140	167

ps = pitting can occur
ps = pitting/crevice corrosion can occur

Chemical Analysis

Weight % (all values are maximum unless a range is otherwise indicated)

Physical Properties

Density

0.285 lbs/in3
7.90 g/cm3

Specific Heat

0.12 BTU/lb-°F (32 – 212°F)
500 J/kg-°K (0 – 100°C)

Modulus of Elasticity

29.0 x 106 psi
200 GPa

Thermal Conductivity 212°F (100°C)

9.4 BTU/hr/ft2/ft/°F
16.3 W/m-°K

Melting Range

25050 – 2590°F
1398 – 1421°C

Electrical Resistivity

29.1 Microhm-in at 68°C

74 Microhm-cm at 20°C

Mean Coefficient of Thermal Expansion

Mechanical Properties

	ASTM
	Typical*	Type 304	Type 304L
0.2% Offset Yield Strength, ksi	42	30 min.	25 min.
Ultimate Tensile Strength, ksi	87	75 min.	70 min.
Elongation in 2 inches, %	58	40 min.	40 min.
Reduction in Area, %	70	—	—
Hardness, Rockwell B	82	92 max.	92 max.

*0.375 inch plate

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