SUS444 high-alloy steel is ferritic stainless steel, compared with the commonly used steel SUS430: 1. Containing high levels of about 1.0% chromium, and molybdenum alloying elements added (Mo), so the steel has good resistance to pitting, crevice corrosion, stress corrosion, the corrosion resistance in some areas even better than SUS304 and SUS316. 2. adding titanium (Ti), niobium (Nb), zirconium (Zr) and other stabilizing elements, so that the steel has Good resistance to intergranular corrosion and high temperature oxidation.
SUS444 steel yield strength equivalent to 1.5 times that of carbon, glass and steel 6 times, for seismic resistance, snow, wind resistance, impact resistance of such a fine outstanding. . SUS444 ferritic stainless steel, high thermal conductivity, chrome-nickel austenitic stainless steel is about 130% ~ 150%, very suitable for heat exchange purposes. Thermal expansion coefficient, the team chrome-nickel austenitic stainless steel is only 60% to 70%, very suitable for thermal expansion, shrinkage, a thermal cycling conditions. The plasticity of the steel, toughness, suitable for stretching, rolling and forming and stamping manufacturing. Corrosion-resistant applications in particular, is the most outstanding, high corrosion resistance in chloride media than ordinary ferritic stainless steel, and Olympic's stainless steel body, generally does not produce chloride stress corrosion cracking. Prior to joining Ni, Ti, Mo and other element, the improved resistance to pitting and crevice corrosion. The ordinary stainless steel welding method can be welded. The steel is particularly suitable for food processing equipment, heat exchangers, water heaters, tanks, water storage tank, solar panels.
SUS444 performance: SUS444 with ultra-low carbon and nitrogen impurities SUS444 added to improve the ability of resistance to pitting corrosion of molybdenum SUS444 added the role of a stabilizing element niobium or titanium
Mechanical properties N/mm2 N/mm2 yield strength tensile strength grades elongation% Hardness HB / HRB / HV cold 180 °, d = 2a Typical 31048030160 SUS444 qualified SUS444 Standard ≥ 245 ≥ 410 ≥ 20 ≤ 217 / ≤ 96 / ≤ 230 qualified SUS304 Standard ≥ 205 ≥ 520 ≥ 40 ≤ 200 - SUS316L Standard ≥ 175 ≥ 480 ≥ 40 ≤ 200 - Physical Characteristics Grade the thermal conductivity of the magnetic density g/cm3 100 ° C, W / m * K thermal expansion coefficient of 0 ~ 100 ° C, mm / m * K
SUS444 7.75 26.8 11.0 '10-6 SUS304 8.03 No 16.2 16.9 '10-6 SUS316L 7.99 No 16.2 16.0 '10-6 SUS444 low density can be used to increase the area of SUS444 thermal conductivity, easy-to-heat SUS444 less thermal expansion, welding deformation Corrosion resistance 1 chloride stress corrosion cracking resistance capacity Accelerated corrosion tests using laboratory methods, test standards: GB / T 17898-1999 "stainless steel in boiling magnesium chloride solution, stress corrosion test." Test material SUS304 SUS316L SUS444 The occurrence time of the crack and crack-free h 2.5 9.8 48h Throughout the time of crack and crack-free h 2.5 11.8 48h SUS444 has excellent resistance to chloride stress corrosion cracking SUS444 chloride ion pitting corrosion resistance better than SUS304 SUS444 chloride ion pitting corrosion resistance ability and SUS316L considerable 444 no intergranular corrosion after welding tendency