Premier Stainless Steel Centrifugal Casting: 304H · 316L · 310 · 321H for Process & Chemical Service

304H is 18Cr-8Ni with controlled higher carbon content (0.04-0.08%) for elevated-temperature creep service up to 800°C. 316L is 17Cr-12Ni-2.5Mo with low carbon (max 0.03%) providing better corrosion resistance against chlorides and acids — critical for chemical, pharmaceutical, and marine applications. 316L costs approximately 30% more than 304H due to molybdenum addition. Select 304H for general structural and elevated-temp; 316L for corrosive service.

ASTM A351 / A351M (Castings, Austenitic, for Pressure-Containing Parts) is the primary standard for stainless centrifugal castings in pressure service. ASTM A744 covers corrosion-resistant iron-chromium-nickel alloys. ASTM A608 covers heat-resistant Fe-Cr-Ni for higher-temperature service. EN equivalent: EN 10295 (heat-resistant) and EN 10283 (corrosion-resistant) for centrifugal castings sold into EU markets.

Yes. We routinely cast 2205 duplex (22Cr-5Ni-3Mo-N) and 2507 super duplex (25Cr-7Ni-4Mo-N). Phase balance (target 50% austenite / 50% ferrite) verified by metallography on test samples. Solution heat treatment at 1,050-1,100°C followed by water quench preserves duplex microstructure. Common applications: marine pumps, desalination plant components, oil & gas downhole equipment.

Depends on grade. 304/304H up to 800°C. 316/316L up to 800°C (lower at oxidizing conditions due to Mo). 310 up to 900°C with good oxidation resistance. 321H (stabilized with Ti) up to 870°C resists chromium-carbide precipitation. 347H (Nb-stabilized) similar. Above 900°C, transition to heat-resistant alloys (HK40, HP40, Inconel) is recommended.

Yes. 316L stainless castings can be supplied with electropolished ID surfaces meeting ASME BPE (Bioprocessing Equipment) standards. Standard EP surface finish Ra below 0.5 μm. Typical applications: pharmaceutical clean piping, biotech reactor vessels, and high-purity gas distribution. We coordinate with electropolishing service providers; certified EP finish reports issued per batch.

316L costs approximately 25-35% more than 304H per kilogram due to molybdenum content (2-3% Mo addition). 310 grade costs approximately 40-50% more than 304H due to higher Ni content (20% vs 8%). Duplex 2205 costs approximately 30-40% more than 316L. Super duplex 2507 costs approximately 60-80% more than 316L. Final pricing depends on alloy market conditions and order size.

Yes. X-ray fluorescence (XRF) PMI testing on every shipped batch — Cr, Ni, Mo, Mn, Si, Cu, Ti, Nb measured. PMI reports include element percentages and grade confirmation. Useful for buyer incoming inspection programs and supplier audit compliance. Third-party PMI verification by SGS or BV available on request for high-value orders.

Standard stainless tubes (304H, 316L, 310): 25-35 days from confirmed PO. Custom-spec castings with new mold tooling: 40-55 days. Duplex grades: 30-45 days. Electropolished pharma grade: add 10-15 days for EP processing. Heat treatment and NDT testing included in lead time. Sea freight to US/EU: add 30-45 days.

Solution annealing at 1,050°C followed by rapid water quench is standard for austenitic stainless. Prevents chromium-carbide precipitation (sensitization) and maintains corrosion resistance. For duplex grades: 1,050-1,100°C solution treatment to preserve 50/50 austenite/ferrite phase balance. Documented thermal profile included with every batch. Stress-relief annealing available on request for machining-sensitive applications.

Yes. Duplex 2205 and super duplex 2507 castings can be certified to NACE MR0175 / ISO 15156 for sour service (H2S-containing) applications in oil & gas. Hardness limits maintained below 28 HRC for sulfide-stress-cracking resistance. Test certificates with NACE compliance statement issued per batch. Common for downhole equipment and sour-service production hardware.