Stainless Steel 310 (UNS S31000) And 310S (UNS S31008)

Stainless Steel 310, combining excellent high temperature properties with good ductility and weldability, is designed for high temperature service. It resists oxidation in continuous service at temperatures up to 1150°C provided reducing sulphur gases are not present. It is also used for intermittent service at temperatures up to 1040°C. Stainless Steel 310S (UNS S31008) is used when the application environment involves moist corrodents in a temperature range lower than that which is normally considered “high temperature” service. The lower carbon content of 310S does reduce its high temperature strength compared to 310.

Key Properties

These properties are specified for product (flange, pipe fittings and pipes) in ASTM A240/A240M. Similar but not necessarily identical properties are specified for other products such as pipe and bar in their respective specifications. Composition Typical compositional ranges for grade 310 stainless steels are given in table 1. Table 1. Composition ranges for 310 grade stainless steel Grade C Mn Si P S Cr Mo Ni N 310 min. max. – 0.25 – 2.00 – 1.50 – 0.045 – 0.030 24.0 26.0 – 19.0 22.0 – 310S min. max. – 0.08 – 2.00 – 1.50 – 0.045 – 0.030 24.0 26.0 – 19.0 22.0 – Mechanical Properties Typical mechanical properties for grade 310 stainless steels are given in table 2. Table 2. Mechanical properties of 310 grade stainless steel Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness Rockwell B (HR B) max Brinell (HB) max 310 515 205 40 95 217 310S 515 205 40 95 217 Physical Properties Typical physical properties for annealed grade 310 stainless steels are given in table 3. Table 3. Physical properties of 310 grade stainless steel in the annealed condition Grade Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (μm/m/°C) Thermal Conductivity(W/m.K) Specific Heat 0-100°C (J/kg.K) Electrical Resistivity (nΩ.m) 0-100°C 0-315°C 0-538°C at 100°C at 500°C 310/S 7750 200 15.9 16.2 17.0 14.2 18.7 500 720 Grade Specification Comparison Approximate grade comparisons for 310 stainless steels are given in table 4. Table 4. Grade specifications for 310 grade stainless steel Grade UNS No Old British Euronorm Swedish SS Japanese JIS BS En No Name 310 S31000 310S24 – 1.4840 X15CrNi25-20 – SUH 310 310S S31008 310S16 – 1.4845 X8CrNi25-21 2361 SUS 310S These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted. Welding Good characteristics suited to all standard methods. Stainless Steel 310S electrodes generally recommended for fusion welding. AS 1554.6 pre-qualifies welding of 310 with Grade 310 rods or electrodes. “Dual Certification” Stainless Steel 310 and Stainless Steel 310S are sometimes stocked in “Dual Certified” form – mainly in Stainless Steel 310 Tube and Stainless Steel 310S Pipe. These items have chemical and mechanical properties complying with both 310 and 310S specifications.

Applications Typical applications include: •         Furnace parts •         Oil burner parts •         Carburising boxes •         Heat Treatment baskets and jigs •         Heat Exchangers •         Welding filler wire and electrodes

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