Introduction
Grade S31600 is the molybdenum grade defined in the UNS system, which comes after the UNS S30400 in its importance within the austenitic stainless steels. The molybdenum offers S31600 enhanced corrosion resistant properties than SUS 304, especially more resistance to crevice corrosion and also pitting in chloride atmosphere.
Chemical composition and Mechanical properties Of UNS 31600
Chemical composition Of UNS 31600 :
| Grade（%） | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| UNS 31600 | 0.08 | 2.0 | 0.75 | 0.045 | 0.030 | 16-18 | 2.00-3.00 | 11.00-14.00 | 0.1 |
Mechanical properties Of UNS 31600 :
| Grade | Tensile Strength (MPa) | Proof Stress (MPa) | Elongation A50 mm | Hardness Brinell | Reduction of area ψ (%) | Yield strength (N/mm2) |
| UNS 31600 | 500-700 | 200Min | 40% Min | 215 Max HB | ≥60 | ≥205 |
Application
Coastal development paneling, trim and railings
Process utilities, instrumentation in lab and chemical industry
Instruments and utilities in food preparation in chloride environments
Instruments and processing utilities in textile industry
Fittings, and accessories in boating and marine industry
Instruments and processing utilities in pharmaceutical industry
Instruments used in pollution control
Heat exchangers in coastal environment filled with chlorides
Other Analysis
Why S31600 called Grade 316 Stainless Steel? When a material grade is specified as stainless steel, it means it has chromium content but this grade has molybdenum in it that makes it different. S31600 is the UNS designation alloy, also referred as 316 alloy in SAE designation and is defined in ASTM A240 standard.
Alloy UNS S31600 offers excellent and high temperature tensile, creep and stress-rupture strengths. Moreover it also gives outstanding formability and weld-ability. S31600 is the higher carbon version of S31603 and is influenced from sensitization; thus heavy welded sections in Grade 316 may need post-weld annealing for maximum corrosion resistance unlike 316L.
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