SS 304L HN is an austenitic Chromium-Nickel stainless steel offering the optimum combination of corrosion resistance, strength and ductility. This makes it good for use metal diaphragms, for both aerospace sensors and burst discs. It has been remelted by ESR refining and conditioned to produce a minimum non-metallic impurity level. This will result in a surface that is most favorable for minimizing failures during severe forming operations. The high Nickel composition provides optimum ductility and formability from the annealed temper due to low work hardening rate. The low carbon content reduces susceptibility to carbide precipitation during welding.
The alloy is readily formed in the annealed temper.SS 304L HN may be joined by all commonly used brazing and welding methods including oxyacetylene. The corrosive resistance to acids is generally very good with the exception to halogen acids.
Available Sizes:
SS 304L HN is available from Hamilton Precision Metals as strip product in thicknesses from 0.0005” to 0.050” (0.0127 mm to 1.27 mm) in widths up to 12.0” (304.8 mm). It is also available in foil as thin as 0.000200” (0.0508 mm) in widths of 4.0” (101.6 mm) maximum. The material conforms to ASTM A240, ASTM A666 and UNS S30403.
Nominal Composition
| SS 304L HN NOMINAL COMPOSITION |
| Chromium |
18.5%
|
| Nickel |
10.0%
|
| Manganese |
1.6%
|
| Silicon |
0.5%
|
| Carbon |
0.015%
|
| Iron |
Balance
|
Mechanical Properties
| SS 304L HN MECHANICAL PROPERTIES |
|
ANNEALED |
COLD ROLLED |
| Ultimate Tensile Strength |
100,000 PSI |
210,000 PSI |
| Yield Strength (0.2% Offset) |
40,000 PSI |
190,000 PSI |
| Elongation in 2” * |
40%
|
2%
|
| Modulus of Elasticity (Tension) |
28 X 106
PSI
|
28 X 106
PSI
|
| Poisson’s Ratio |
0.29
|
- |
The measured elongation will be less as thickness decreases to 0.002” and less.
These values may be adjusted by control of specific melt chemistry and process variables to obtain discrete
ranges of strength and ductility. Consult Hamilton Precision Metals for desired limits to meet application need.
Physical Properties
| SS 304L HN PHYSICAL PROPERTIES |
| Density |
0.284 lbs./cu.in |
| Melting Point (Approx.) |
1400°C |
| Electrical Resistivity @ R.T |
72 Microhm·cm |
| Thermal Expansion Coeffiecient (0° to 100°C) |
17.3 x 10-6 /°C |
|
Thermal Conductivity @ 100°C
|
16.3 W/m·K
|
Magnetic Attraction
Annealed
Cold Rolled
|
None
Slight
|
| Magnetic Permeability (Annealed: H= 200 oersteds) |
1.02 Max.
|
Typical values to guide alloy selection but are not a guarantee of minimum or maximum