Zeron 100 forgings per ASTM A182 F55, F55 being the super-duplex stainless grade designation, cover the full range of forged piping components: weld-neck / slip-on / blind / threaded / lap-joint flanges; elbows / tees / reducers / caps / crosses; rings; valve bodies; and custom forged shapes. We hot-forge from solution-annealed bar or billet, then mandatorily solution-anneal the forging at 1100-1140°C followed by water quench, required to dissolve any sigma-phase that formed during the hot-work cooldown and to lock in the equilibrium 50/50 austenite-ferrite microstructure that gives super duplex its corrosion + strength envelope.
F55 = super duplex grade in A182 · Solution-anneal post-forge mandatory · PREN ≥ 40 · Sigma-phase free per A923 Method C
Standards stack: ASTM A182 F55 (forged flanges + fittings + valve bodies), ASTM A473 (forging stock for fasteners), ASTM A314 (billets and bars for forging), ASME B16.5 (flange dimensions, classes 150-2500), ASME B16.47 (large-diameter flanges, NPS 26+), NORSOK M-630 MDS 055 (North Sea super duplex acceptance), NACE MR0175 (sour-service hardness), PED 2014/68/EC (European pressure equipment), ISO 14313 (pipeline valve forgings).
All Zeron 100 forgings ship in the SA (solution-annealed) supply state. Cold-work routes don't apply to forgings, the post-forge solution-anneal cycle restores SA properties uniformly through the cross-section. Where buyer spec calls for FLT (low-temperature), we cherry-pick heat lots that meet the -46°C Charpy criterion (45 J avg / 35 J min); the supply state stays SA but the certificate carries the low-temp Charpy witness. AFP (coated) forgings are post-machined and surface-treated per ASTM F1137; the same AFP coating menu as fasteners (Xylan, Xylar, SermaGard, Dacromet) applies to forged valve bodies, manifolds, and flange faces in repeated-makeup service.
| Component | Standard | Size range | Typical service |
|---|---|---|---|
| Weld-neck flanges (WNRF) | ASME B16.5 + ASTM A182 F55 | 1/2 in to 24 in (NPS), Class 150-2500 | Process piping, offshore topside, subsea manifolds |
| Slip-on flanges (SORF) | ASME B16.5 | 1/2 in to 24 in (NPS), Class 150-1500 | Low-pressure piping, instrument lines |
| Blind flanges (BLRF) | ASME B16.5 | 1/2 in to 24 in (NPS), Class 150-2500 | Pipeline isolation, vessel access closures |
| Threaded flanges (THRF) | ASME B16.5 | 1/2 in to 4 in | Instrument tap-off, low-pressure connections |
| Lap-joint flanges (LJRF) | ASME B16.5 | 1/2 in to 24 in | Stainless-on-CS bolting where alignment matters |
| Large-diameter flanges | ASME B16.47 series A or B | NPS 26 to 60 | Pipeline transmission, FGD ducts, large-bore manifolds |
| Buttweld elbows / tees / reducers / caps | ASTM A815 WP-S | 1/2 in to 24 in NPS | Process piping geometry changes |
| Forged rings (rolled rings) | ASTM A473 | OD 100-2000 mm, ID 50-1800 mm | Bearing rings, slewing-bearing components, seal rings |
| Valve bodies + bonnets | ASTM A182 F55 + ISO 14313 | 1/4 in to 36 in (full-bore) | Ball valves, gate valves, choke valves |
| Custom shapes | per buyer drawing | up to 200 mm cross-section, 600 mm OD | Specials: hubs, manifolds, subsea connectors |
Hot-forging Zeron 100 means heating to 1100-1280°C, deforming, and cooling. The cooldown passes through the sigma-phase precipitation window (600-1000°C) at unpredictable rates depending on forging mass and section geometry. Without intervention, sigma-phase, chi-phase, M23C6 carbides, and Cr2N nitrides form in the ferrite phase, brittle, corrosion-vulnerable precipitates that destroy the super-duplex envelope. The solution-anneal cycle (1100-1140°C soak + water quench) is mandatory: it dissolves the brittle phases and the rapid quench skips the precipitation nose on the way back to ambient. Every Zeron 100 forging on this site has been solution-annealed; the certificate confirms it with an A923 Method C sigma-phase Charpy test (60 J min at room temperature) on a witness coupon from the same heat-treat batch.
| Service | Why F55 forging |
|---|---|
| FPSO topside flanges + manifolds | Saltwater spray + sour-process content + cyclic thermal/pressure |
| Subsea manifold + jumper flanges | Deepwater + chloride + cold (FLT-controlled forging) |
| API 6A wellhead bonnets + master valves | HPHT + sour + valve-body cycling |
| Desalination RO membrane vessel flanges | Concentrated brine + chloride + pressure cycling |
| FGD scrubber duct + chimney flanges | Wet-flue-gas chloride + sulfate + 200-300°C |
| Pulp & paper bleach plant valves + manifolds | ClO2 + chlorine + chloride at process temp |
| Geothermal wellhead flanges + valve bodies | H2S + CO2 + temperature |
| Chemical process valves (HCl, H2SO4) | Cu+W content gives reducing-acid resistance |
Send the spec (component type + size + ASME class + standards / MDS to comply with + buyer drawing if specials + quantity + destination port) to info@torqbolt.com or +91-22-66157017 / WhatsApp. Stock flanges (ANSI Class 150-2500, NPS 1/2 to 12 inch) ship in 4-6 weeks; large-diameter or custom shapes 8-14 weeks.
