SS304 / SS304L
Stainless steel 304(SS304) is the most basic stainless steel known as 18-8 grade with higher chromium and low carbon content. The low carbon content restricts carbide precipitation during welding as well as minimizes its susceptibility to intergranular corrosion. Stainless steel 304L(SS304L) is an extra low-carbon variation of SS304 with a 0.03% maximum carbon content that eliminates carbide precipitation due to welding. Both SS304 and SS304L have excellent resistance to a wide range of atmospheric, chemical and petrochemical, and food industry corrosions. Usually, they can be used in applications with the maximum temperature of 1650°F[900°C] exhibiting good oxidation resistance.
ASTM A403 WP304L (SS304L) butt welding pipe fittings: elbows, reducers, tees.
1. UNS Designation & International Equivalent
| Type | UNS | JIS | EN/DIN | EN/BS | EN/NF | ISO | GB | GOST |
|---|---|---|---|---|---|---|---|---|
| 304 | S30400 | SUS304 | X5CrNi18-10 | 304S31 | Z7CN18.09 | 11 | 0Cr18Ni9 | 08KH18H10 |
| 304L | S30403 | SUS304L | X2CrNi19-11 | 304S11 | X2CrNi19-11 | 10 | 00Cr19Ni11 | 03KH18H11 |
2. Product Forms and Standards of SS304 / SS304L
| Product Forms | Material Standards |
|---|---|
| Plates, Sheets & Strips | ASTM A240, A666 |
| Billets, Bars & Rods | ASTM A276, A314, A479 |
| Forgings(Flanges & Fittings) | ASTM A182, A473. |
| Wires | ASTM A313, A368, A478, A492, A493, A580. |
| Seamless and Welded Pipes | ASTM A312, A358, A813, A814. |
| Wrought Pipe Fittings | ASTM A403 |
| Castings(Cast Fittings & Valve Parts) | ASTM A351, A743, A744 |
3. Physical Properties of SS304/ SS304L
ASTM A182 F304 W/N flanges, 150# 2″ SCH40.
| Density | Melting Range | Specific Heat | Magnetic Permeability | Electric Resistivity |
|---|---|---|---|---|
| g/cm3 | °F | kJ/kg*K | Oersteds | microhm-cm |
| 8.03 | 2550-2650 | 0.50 | ≤1.02 | 72 |
4. Chemical Composition Requirements
| Element | SS304 | SS304L |
|---|---|---|
| Carbon | ≤0.08 | ≤0.03 |
| Manganese | ≤2.00 | ≤2.00 |
| Phosphorus | ≤0.045 | ≤0.045 |
| Sulfur | ≤0.030 | ≤0.030 |
| Silicon | ≤0.75 | ≤0.75 |
| Chromium | 18.00-20.00 | 18.00-20.00 |
| Nickel | 8.00-12.00 | 8.00-12.0 |
| Nitrogen | ≤0.10 | ≤0.10 |
| Iron | Balance | Balance |
5. Mechanical Properties of SS304/ 304L
ASTM A240 SS 304 plates, 2m(L)x1m(W)x2.5mm(THK).
| Grades | Tensile Strength ksi(Mpa), min. | Yield Strength, ksi(Mpa) | Elongation, % | Hardness, Rockwell |
|---|---|---|---|---|
| SS304 | 85(586) | 35(241) | 55 | B80 |
| SS304L | 90(621) | 42(290) | 55 | B82 |
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