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) |
Flanges in Stainless Steel 304/304L Flanges are manufactured via precision closed-die or open-die forging to establish continuous metallurgical grain flow along the flange hub and neck contour. Raw billets are heated in calibrated gas-fired furnaces under strictly controlled soak temperatures to eliminate microstructural defects.
Depending on the alloy grade, components undergo certified thermal conditioning: normalizing for carbon steels (A105N, A350 LF2), rapid water quench solution annealing at 1040°C–1120°C for stainless and duplex grades, or controlled aging for nickel superalloys. This ensures exceptional notch toughness, yield strength, and resistance to stress corrosion cracking.
Final machining is executed on heavy-duty CNC turning centers to guarantee precise raised face, flat face, or ring type joint (RTJ) dimensions compliant with ASME B16.5, ASME B16.47, DIN, or EN 1092-1 standards. Gasket contact surfaces receive spiral or concentric serrations strictly controlled between 125 and 250 µin Ra.
Every production heat is issued with an EN 10204 Type 3.1 inspection certificate containing full heat chemistry, mechanical tensile test data, and Charpy impact values. Independent Third-Party Inspection (TPI) by Lloyd's, BV, DNV-GL, TÜV, and SGS is readily accommodated for global EPC and refinery contracts.
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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