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Materials of Construction -
Metals - 304/304H SS
December 12, 2001
|
Introduction Chemical Composition Corrosion Resistance Designations Specifications Physical Properties Mechanical Properties Fabrication |
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Type 304 stainless steel is the most versatile and one of the most widely applied of the 300 series stainless steels. It has excellent forming and welding characteristics. The carefully controlled analysis of Type 304 enables it to be deep drawn more severely than Types 301 and 302 without intermediate softening. This property has made this grade dominant in the manufacture of drawn stainless steel parts. It is readily brake brake or roll formed into a variety of other parts for application in the industrial, architectural and transportation fields.
Type 304 also has outstanding welding characterisitics. Post-weld annealing is not required to restore the excellent performance of this grade in a wide range of midly corrosive conditions.
Chemical Composition (wt% typical)
| 304 | 304H | ||
| Nickel | Ni | 8.0 - 10.5 | 8.0 - 10.5 |
| Chromium | Cr | 18.0 - 20.0 | 18.0 - 20.0 |
| Manganese | Mn | 2.0 max | 2.0 max |
| Iron | Fe | Balance | Balance |
| Carbon | C | 0.08 max | 0.04-0.10 |
| Phosphorus | P | 0.045 max | 0.045 max |
| Sulphur | S | 0.030 max | 0.030 max |
| Silicon | Si | 0.75 max | 0.75 max |
| Nitrogen | N | 0.10 max | - |
UNS S30400
Alternate Names: 18-8 Stainless Steel
| ASTM | Tube and Pipe | A430 |
| Pipe - Welded | A312, A409, A813, A814 | |
| Pipe - Seamless | A312, A376 | |
| Tube - Welded | A269, A688 | |
| Tube - Seamless | A269, A271 | |
| Bars and Shapes | A276, A479 | |
| Forgings | A336, A473 | |
| Forged Flanges and Fittings | A403 | |
| Plate and Sheet | A240, A666 | |
| Strip | A240, A666 | |
| Rod and Shapes | A276, A479 |
| Electrical Resistivity | 68°F | 72 microhm-cm |
| Coefficient of Thermal Expansion | 0-100°C (32-212°F) | 9.6 E-6 in/in °F |
| Magnetic Permeability |
1.02 | |
| Themal Conductivity | 100°C
(212°F) 500°C (932°F) |
9.4 BTU/ft h °F 12.4 BTU/ft h °F |
| Ultimate Tensile Strength | 579 MPa (84,000 psi) |
| Elongation in 50.8 mm (2 in.) | 55% |
| Yield Strength (0.2% offset) | 241 MPa (35,000 psi) |
| Hardness | 80 Rb 149 BHN |
| Impact Charpy | 135 ft lbs |
| Modulus of Elasticity (Tension) | 193,052 MPa (28,000,000 psi) |
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