24 July 2021 Duplex Stainless Steel
SAF2304 Duplex Stainless Steel Bar
SAF2304 stainless steel (China brand: 00Cr23Ni4N) is a low-alloy duplex stainless steel developed by Sweden. Its solution treatment temperature is about 1000 ℃. The organization has 40% -50% ferrite and 50% -60% austenite, With the common features of duplex stainless steel, is a steel that has been developed as a commonly used austenitic stainless steel for 304L and 316L as a high strength and inexpensive feature.
It has been recognized by the American Society of Mechanical Engineers (ASME) for pipes used in boilers and pressure vessels, chemical plants and refineries and many countries have included standards. The United States standard is UNS S32304, and the Swedish commercial brand is SAF 2304. SAF2304 duplex stainless steel PRE value of 25, and 316L stainless steel equivalent. When we examined the relationship between the critical pitting temperature (CPT) and the chloride ion content of several steels in NaCl solution at 300mV potential, we found that the CPT value of ASF2304 duplex stainless steel is higher than 304L, which is equivalent to 316L.
In the autoclave neutral chloride solution several kinds of steel test results found that the external stress equivalent to the yield strength of steel at this temperature, the test time 1000h, under the curve is not stress corrosion cracking area. In addition SAF2304 dual-phase steel resistance to intergranular corrosion good, through CuSO4 + H2SO4 copper scrap method of testing. SAF2304 duplex steel has good corrosion resistance in nitric acid and is comparable to 304L.
In other acids, such as sulfuric acid, its corrosion resistance is comparable to that of 316L, whereas organic acids, such as formic acid, are even better than 316L. SAF 2304 stainless steel has good mechanical and physical properties, stress corrosion resistance and other forms of corrosion and good weldability, making it possible to replace the 304,304L, 316,316L and other austenitic stainless steel. Can be used to manufacture amine recovery equipment, hydrocarbon fermentation equipment, etc., in addition, can also be used as manufacturing industrial heat exchanger, pulp and paper industry, cooking pot preheater and hot and humid, offshore seating train seat.