Product name: 254SMO/UNS S3 1254
International name: 254SMO, UNS S3 1254, Northwest China. 1.4547，F44，NAS 185N，00Cr20Ni 18Mo6CuN，6Mo。
Implementation standards: ASTM A240/ASME SA-240, ASTM A276, ASTM a182/ASME sa-182, ASTM a312/ASME a312.
Main components: carbon (C)≤0.02, manganese (Mn)≤ 1.00, nickel (Ni) ≤ 17.5 ~ 18.5, silicon (Si)≤0.8, phosphorus (P)≤0.03.
Physical properties: 254SMO density: 8.24g/cm3, melting point: 1320- 1390℃, magnetism: none.
Heat treatment: keep the temperature at1150-1200℃ for 1-2 hours, and air-cool or water-cool quickly.
Mechanical properties: tensile strength: σb≥655Mpa, yield strength σb≥3 10Mpa, elongation: δ≥35%, hardness: 182-223(HB).
Corrosion resistance and main application environment: 254SMO stainless steel is a super austenitic stainless steel with high corrosion resistance. It is developed for halide and acid environment and is widely used in harsh working conditions such as high concentration chloride ion medium and seawater. In various industrial occasions of acidic medium, especially in acid containing halide, 254SMO is far superior to other stainless steels, and can be comparable to Hastelloy and titanium in some cases. The low carbon content and high molybdenum content make it have good pitting corrosion resistance, crevice corrosion resistance and excellent intergranular corrosion resistance. It is a kind of stainless steel with high cost performance, which is widely used in chemical industry, desulfurization and environmental protection at home and abroad.
In pure sulfuric acid, the corrosion resistance of 254SMO is much stronger than that of 3 16 ordinary stainless steel. However, at high concentration, the corrosion resistance of 254SMO is slightly weaker than that of 904L(NO8904) stainless steel. Among sulfuric acid containing chloride ions, 254SMO has the greatest corrosion resistance. 3 16 ordinary stainless steel can't be used in hydrochloric acid due to the possibility of local corrosion and uniform corrosion, but 254SMO can be used in dilute hydrochloric acid at room temperature. There is no need to worry about pitting corrosion in the area below the boundary line. But we must try our best to avoid the gap. Among fluosilicic acid (H2SiF4) and hydrofluoric acid (HF), the corrosion resistance of ordinary stainless steel is very limited, while 254SMO can be used in a wide range of concentrations and temperatures.
Matching welding materials and welding technology: 254SMO is welded with advanced 625 alloy series welding materials, namely ERNiCrMo-3 welding wire and ENiCrMo-3 covered electrode. The welding materials are φ 1.0, 1.2, 2.4, 3.2 and 4.0, and the origin is Hastelloy, SMC and Germany. Welding technology and.
Inventory situation: the inventory size of 254SMO stainless steel plate is 0.5mm- 18mm, and the inventory size of bar is φ12 mm-φ 250 mm. Pipes and fittings can be customized according to customer requirements. The main producing areas of materials are Japanese metallurgy, Nippon Steel & Sumitomo Corporation of Japan and OUTOKUMPU of Sweden. Provide proof of original materials, customs declaration and certificate of origin.
Applications include: petroleum and petrochemical equipment, such as bellows in petrochemical equipment, pulp and paper bleaching equipment, such as pulp digesters, bleaching equipment, barrels and rollers of filter scrubbers, etc. Power plant flue gas desulfurization device, mainly used for tower, flue, baffle, internals, spray system, etc. Absorber, offshore system or seawater treatment, such as thin-walled condenser tube for seawater cooling in power plant and seawater desalination treatment.