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316SS Investment Casting -316SS (316 Stainless Steel) is a molybdenum-alloyed austenitic cast stainless steel, the most widely used corrosion-resistant casting grade after 304SS. It offers superior chloride and pitting corrosion resistance vs. 304, making it ideal for marine, chemical, and coastal applications.
International Standards & Equivalent Grades
| Standard | Grade Designation |
|---|---|
| ASTM (USA) | CF-8M (J92900) |
| EN (Europe) | 1.4408 / GX6CrNiMo18-10 |
| ISO | G-X6CrNiMo18-10 |
| Australian AS | CF8M / AS 4443-CF8M |
| Low Carbon Variant | 316L Cast: CF-3M (J92800) / 1.4435 |
Chemical Composition (Typical, %)
Chromium (Cr): 16.0–18.0% (forms passive oxide layer)
Nickel (Ni): 10.0–14.0% (stabilizes austenite)
Molybdenum (Mo): 2.0–3.0% (key for chloride/pitting resistance)
Carbon (C): ≤0.08% (316SS) / ≤0.03% (316L)
Silicon (Si): ≤1.50%, Manganese (Mn): ≤2.0%
Phosphorus (P): ≤0.045%, Sulfur (S): ≤0.030%
Key Properties
Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, and chloride attack (saltwater, chemicals).
Mechanical (As-Cast / Annealed):
Tensile Strength: ≥520 MPa
Yield Strength: ≥205 MPa
Elongation: ≥30%
Hardness: ~180 HB
Physical: Density ~7.98 g/cm³; non-magnetic; good weldability.
Heat Resistance: Service up to ~870°C; prone to sensitization (carbide precipitation) 425–860°C.
Casting Processes
Investment Casting (precision parts: valves, pumps, fittings)
Sand Casting (larger components: housings, impellers)
Centrifugal Casting (pipes, sleeves)
Typical Applications
Marine: pumps, valves, fasteners, offshore hardware
Chemical & Petrochemical: reactors, piping, tanks
Food & Pharmaceutical: sanitary processing equipment
Pulp & Paper, Desalination, Sewage Treatment
Medical Instruments, Marine Hardware
316SS vs 316L Cast
316SS (CF-8M): Standard carbon (≤0.08%); good for general corrosion.
316L (CF-3M): Ultra-low carbon (≤0.03%); better post-weld corrosion resistance; preferred for welded assemblies
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