Super ferritic stainless steel usually refers to high-performance special ferritic stainless steel with high Cr, high Mo, and ultra-low C+N, containing 18-30% Cr, 2-4% Mo, C+N≤250×10-6 and appropriate amount of stabilizing elements, ultra-high cleanliness, ultra-high uniformity, and pitting resistance equivalent PREN≥35. It has a low toughness-brittleness transition temperature, good welding and mechanical properties.
Its main grades and corrosion resistance equivalents are:
00Cr30Mo2 (447J1), PREN = 36.6;
00Cr25Ni4Mo4Ti, PREN = 38.2;
00Cr29Mo3Ti, PREN = 38.9;
00Cr27Ni2Mo3.5Ti (Sea-Cure), PREN = 39;
00Cr29Mo4Ti (Al29-4C), PREN = 42.2; 00Cr29Mo4Ni2, PREN = 42.2;
This type of steel has extremely high resistance to general corrosion and local corrosion in hot Cl- solution. For example, 00Cr30Mo2 (447J1) is better than 300 series stainless steel and 2205 duplex steel in chloride-containing solution in terms of pitting corrosion, stress corrosion and general corrosion resistance. Its corrosion resistance in NaOH and HAc is equivalent to that of pure Ni. In NaClO3 It is superior to high-purity Cr26Mo1 and pure Ni in high-temperature NaOH of oxidant, and is mainly used in NaOH concentration equipment, flue gas desulfurization equipment, and condensers of thermal power plants. 00Cr25Ni4Mo4Ti has excellent pitting and crevice corrosion resistance in seawater and chloride-containing media, and is mainly used in factories using seawater or other chloride-containing solutions to manufacture scrubbers, heat exchangers, condensers and other equipment.
stainless steel cold drawn tube
