254SMO Steel

UK deliveries. Contact our well informed sales team. 254SMO Steel Stockholder & Supplier. High performance austenitic stainless steels differ substanti-ally from more conventional grades with regard to resistance to corrosion and, in some cases, also mechanical and phy-sical properties. This is mainly due to the high contents of Steel EN ASTM904L 1.4539 N08904254 SMO?1.4547 S312544565 1.4565 Chemical composition, % National steel designations,steel namesteel No typical values superseded by ENEN ASTM C N Cr Ni Mo Others BS DIN NF SS2205 1.4462 S32205* 0.02 0.17 22 5.7 3.1 ? 318S13 1.4462 Z3 CND 22-05 Az 2377SAF 2507?1.4410 S32750 0.02 0.27 25 7 4 ? ? ? Z3 CND 25-06 Az 23284436 1.4436 316 0.03 ? 16.9 10.7 2.6 ? 316S33 1.4436 Z7 CND 18-12-03 23434439 1.4439 S31726 0.02 0.14 17.8 12.7 4.1 ? ? 1.4439 Z3 CND 18-14-05 Az ?4529 1.4529 N08926 0.01 0.20 20 25 6.4 Cu ? 1.4529 ? ?904L 1.4539 N08904 0.01 ? 20 25 4.3 1.5 Cu 904S13 1.4539 Z2 NCDU 25-20 2562254 SMO?1.4547 S31254 0.01 0.20 20 18 6.1 Cu ? ? ? 23784565 1.4565 S34565 0.02 0.45 24 18 4,5 6 Mn ? 1.4565 ? ?* Also available as S31803 chromium, nickel, molybdenum and nitrogen.From a fabrication viewpoint, i.e., with regard to manu-facturing of components and equipment, they are to some extent similar to standard austenitic grades such as 1.4301 and 1.4401, but they still require special know-how with regard to welding and machining. Outokumpu Stainless manufactures a numbers of steels of this type: 904L, 254 SMO and 4565. 4529 can also be delivered if specified. The properties of 4529 are in general terms very similar to those of 254 SMO.In certain applications the grades 4439 (austenitic) and 2205 (duplex) may be used as an alternative to 904L,whilst SAF 2507 (duplex) may be used as an alternative to 254 SMO. More information concerning duplex options is available in the data sheet for duplex steels.Chemical compositionThe chemical composition of a steel grade may vary slightly between different national standards. Consequently, a speci-fied standard should always be stated when ordering.Chemical composition Table 1Outokumpu Stainless High Performance Austenitic Stainless SteelMechanical propertiesThe strength and elongation of 904L are similar to those for conventional austeni-tic stainless steels. However, the addition of nitrogen in 254 SMO and 4565 gives higher and considerably higher strength respectively, i.e., proof strength and tensile strength, see Tables 3 and 4.Despite the greater strength of thesesteels, the possibilities for cold as wellas hot forming are very good.MicrostructureAll these grades have an austeniticmicrostructure in the quench annealedcondition. 254 SMO and 4565 can,however, contain traces of intermetallic phases(sigma phase) at the centre of the material. Normally, this does not affect the corrosion resis-tance or mechanical properties of the steel. Such precipitates can also occur if the material is expo-sed to temperatures in the range of 600-1000?C. Provided that the recommendations given for hot forming, welding and heat treatment are followed, such precipitates have negligable effect on usabi-lity.904L 254 SMO 4565Rp0.2 Rp1.0 Rm Rp0.2 Rp1.0 Rm Rp0.2 Rp1.0 Rm100?C 205 235 500 230 270 615 350 400 750200?C 175 205 460 190 225 560 270 310 640300?C 145 175 440 170 200 525 240 270 640400?C 125 155 160 190 510 210 240 610904L 254 SMO 4565Hot forming 1200 - 9501200 - 10001200 - 900Solutionannealing1080 - 1160 1150 - 1200* 1120 - 1170Pressure vessel approval (-60) - 400 (-60) - 400 (-196) - 400* Quenching with water at a thickness above 2 mm, below 2 mm an annealing temperature of 1120-1150?C and cooling with air/water can be used.904L 254 SMO 4565Density kg/dm38.0 8.0 8.0Modulus of elasticity GPa 195 195 190Linear expansion at (20 ➝ 100)?C X10-6/?C 15