Sandvik 3R12
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Sandvik 3R12 (Tube and pipe, seamless) Sandvik 3R12 is an austenitic stainless chromium­nickel steel with a low carbon content. STANDARDS Product standards Approval JIS approval for Stainless Steel Tubes CHEMICAL COMPOSITION (NOMINAL) % C Subject to agreement, material with extra low Co content can be supplied. FORMS OF SUPPLY Seamless tube and pipe in Sandvik 3R12 is supplied in dimensions up to 260 mm (10.2 in.) outside diameter in the solution­annealed and white­pickled condition or solution annealed by a bright­annealing process. U­bent tubes can be supplied on request. MECHANICAL PROPERTIES For tube and pipe with wall thickness greater than 10 mm (0.4 in.) the proof strength may fall short of the stated value by about 10 MPa (1.4 ksi). METRIC UNITS, AT 20°C Proof strength a)

IMPERIAL UNITS, AT 68°F Proof strength Rp 0 . 2 Due to its austenitic microstructure, Sandvik 3R12 has very good impact strength, both at room temperature and at cryogenic temperatures. Tests have demonstrated that the grade fulfils the requirements according to the o o European standards EN 13445­2 (UFPV­2) ( (min. 60 J (44 ft­lb) at ­270 C (­455 F)) o o and EN 10216­5 (min. 60 J (44 ft­lb) at ­196 C (­320 F). AT HIGH TEMPERATURES - METRIC UNITS Temperature AT HIGH TEMPERATURES - IMPERIAL UNITS Temperature

CREEP-RUPTURE STRENGTH (ISO-VALUES) Temperature THERMAL CONDUCTIVITY Temperature, °C SPECIFIC HEAT CAPACITY Temperature, °C THERMAL EXPANSION Temperature, °C

MODULUS OF ELASTICITY Temperature, °C 1) Modulus of elasticity, (x103 ) CORROSION RESISTANCE General corrosion Organic acids at moderate temperatures Salt solutions, e.g. sulphates, sulphides and sulphites Caustic solutions at moderate temperatures

Figure 3. TTC­diagram for Sandvik 3R12 (AISI 304L) and AISI 304. Pitting and crevice corrosion The steel may be sensitive to pitting and crevice corrosion even in solutions of relatively low chloride content. Molybdenum­alloyed steels have better resistance improves with increasing molybdenum content. Stress corrosion cracking Austenitic steels are susceptible to stress corrosion cracking (SCC). This may occur at temperatures above about 60°C (140°F) if the steel is subjected to tensile stresses and at the same time comes into contact with certain solutions, particularly those containing...

under 'Heat treatment'. As filler material for gas­shielded arc welding we recommend wire electrodes and rods Sandvik 19.9.L or Sandvik 19.9.LSi. In manual metal­arc welding covered electrodes Sandvik 19.9.LR or Sandvik 19.9.LRHD are recommended. If flux cored arc welding is preferred, electrodes Sandvik 19.9.LT or Sandvik 19.9.LVT should be used. BENDING Annealing after cold bending is not normally necessary, but this point must be decided with regard to the degree of bending and the operating conditions. Heat treatment, if...