SS 304/304L flange manufacturer, Mumbai. ASTM A182 F304/F304L, food/pharma/general chemical grade. All flange types, Class 150-2500. Quote in 30 min.
Stainless Steel 304 and dual-certified 304/304L flanges are the standard 18/8 austenitic stainless steel piping components used across food processing, sanitary pharma, potable water, and mild chemical environments. F304L provides controlled low-carbon limits (0.030% max) to eliminate chromium carbide precipitation during welding.
Governing specification limits per ASTM / ASME standards. Actual values provided on EN 10204 3.1 MTC.
| Element | Specification Limit / Composition |
|---|---|
| Carbon (C) | 0.08 max (F304) |
| Chromium (Cr) | 18.0 - 20.0% |
| Nickel (Ni) | 8.0 - 11.0% |
| Manganese (Mn) | 2.00% max |
| Silicon (Si) | 1.00% max |
| Phosphorus (P) | 0.045% max |
| Sulfur (S) | 0.030% max |
| Property | Specification Limit |
|---|---|
| Yield Strength (0.2% Offset) | 205 MPa (30 ksi) min |
| Tensile Strength | 515 MPa (75 ksi) min |
| Elongation (in 2 in.) | 35% min |
| Hardness | 92 HRB max |
| Solution Anneal Temp | 1040°C min + water quench |
| Service Temp | Class 150 | Class 300 | Class 600 | Class 900 |
|---|---|---|---|---|
| Ambient (-29 to 38°C) | 275 psi (19.0 bar) | 720 psi (49.6 bar) | 1440 psi (99.3 bar) | 2160 psi (148.9 bar) |
| 100°C (212°F) | 230 psi (15.9 bar) | 600 psi (41.4 bar) | 1200 psi (82.7 bar) | 1800 psi (124.1 bar) |
| 200°C (392°F) | 195 psi (13.4 bar) | 520 psi (35.9 bar) | 1040 psi (71.7 bar) | 1560 psi (107.6 bar) |
A: 304 handles freshwater, atmospheric exposure, and mild organic acids. 316/316L is mandatory whenever chlorides (seawater, coastal air, saline streams) or harsh inorganic acids are present due to 316's 2-3% molybdenum addition.
A: 304L restricts carbon to 0.030% max, preventing chromium carbide precipitation in the heat-affected zone (HAZ) during welding, maintaining intergranular corrosion resistance.
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