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 Corrugated pipe in petrochemical equipment 254SMO/UNS S31254 high corrosion resistance
International general information: 254SMO, UNS S31254, W. -nr.1.4547, F44, NAS 185N, 00Cr20Ni18Mo6CuN, 6Mo
Standard: ASTM A240/ASME sa-240, ASTM A276, ASTM A182/ASME sa-182, ASTM A312/ASMES A312
Main ingredients: carbon (C) 0.02 or less, manganese (Mn) of 1.00 or less, nickel (Ni) 17.5 ~ 18.5, silicon (Si) of 0.8 or less phosphorus (P) of 0.03 or less, sulfur (S) of 0.01 or less, chromium (Cr) 19.5 ~ 20.5, copper (Cu) 0.5 ~ 1.0, molybdenum (Mo) 6.0 ~ 6.5, the nitrogen (N) 0.18 ~ 0.22
Physical properties: 254 smo density: 8.24 g/cm3, melting point: 1320-1390 ℃, magnetic: no
Heat treatment: 1-2 hours between 1150-1200 ℃ heat preservation, air cooling or water cooling rapidly.
Mechanical properties: tensile strength: sigma b is greater than 655Mpa, yield strength sigma b is greater than 310Mpa: extension rate: delta is greater than 35%, hardness: 182-223 (HB).
Corrosion resistance and main use environment: 254 smo stainless steel is a kind of high corrosion resistant super austenitic stainless steel, in view of the halide and acid environment and development, widely used in high concentrations of chloride ions in the medium, water and other harsh working environment. In various industrial occasions of acidic media, especially in the acid containing halide, 254 smo is far superior to other stainless steel, in some cases comparable to that of hailin and titanium. Low carbon and high molybdenum content, make it has good resistance to pitting corrosion and crevice corrosion resistance, excellent intergranular corrosion resistant ability, is a kind of cost-effective stainless steel, widely used in chemical industry, the environmental protection in areas such as desulfurization at home and abroad.
In pure sulfuric acid, 254SMO is much more resistant to corrosion than 316 ordinary stainless steel. However, compared with 904L (NO8904) stainless steel in high concentration, the anti-corrosion capability of 254SMO is slightly weaker. In the sulfuric acid containing chloride ion, 254SMO has the largest anti-corrosive force. Because of local corrosion and uniform corrosion, 316 ordinary stainless steel can not be used in hydrochloric acid, but 254SMO can be used in dilute hydrochloric acid in general temperature. No corrosion is necessary in the following areas of the boundary line. But the gap must be avoided. In fluorosilicic acid (H2SiF4) and hydrofluoric acid (HF), the corrosion range of normal stainless steel is very limited, while 254SMO can be applied in a wide range of concentrations and temperatures.
Form a complete set of welding material and welding process, welding with high with 625 alloy series of 254 smo welding materials, namely ERNiCrMo - 3 wire, ENiCrMo - 3 welding rod, welding material size Φ 1.0, 1.2, 2.4, 3.2, 4.0, origin for: America hartz, SMC and nickel, welcome calls for welding procedure and instructions.
Inventory: 254 smo stainless steel plate inventory spot size is 0.5 mm to 18 mm, bar inventory spot size 12 mm - 250 mm Φ Φ, pipe fitting and other can be customized according to customer's requirements. The materials are mainly Japanese metallurgy, Nippon steel and OUTOKUMPU. Provide raw material certificate, customs declaration and certificate of origin.
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