SUS444 (00Cr18Mo2)
1.5 times the yield strength of SUS444 is equivalent to 6 times of carbon steel, steel, glass for seismic resistance, snow, wind resistant, impact resistance and other excellent properties rise above the common herd. SUS444 ferritic stainless steel has a high thermal conductivity, about 130% - 150% of chromium nickel austenitic stainless steel. It is very suitable for heat exchange applications. The coefficient of thermal expansion is small, and the detachment is only 60% ~ 70% of the chromium nickel austenitic stainless steel. It is suitable for use in thermal expansion, cold contraction and thermal cycling. This kind of steel has good plasticity and toughness. It is suitable for stretching, rolling forming and stamping. Corrosion resistance, in particular, is the most excellent. In high chloride medium, the corrosion resistance is superior to that of ordinary ferritic stainless steel and Olympic stainless steel. Generally, there is no stress corrosion cracking of chloride. After adding Ni, Ti, Mo and other elements, the pitting corrosion resistance and crevice corrosion resistance were improved. This type of steel can be welded by welding ordinary stainless steel. The steel is especially suitable for food processing equipment, heat exchanger, water heater tank, water storage tank, solar energy collecting panel, anti-theft window screening and the like.
Characteristics and scope of application
SSUS444 (00Cr18Mo2) is an ultra low carbon nitrogen, 18% chromium and 2% Mo, high corrosion resistant ferritic stainless steel. The steel is usually stabilized by niobium or titanium, which avoids intergranular corrosion after welding. The steel is especially suitable for various water treatment devices.
SUS444 steel is high alloy ferritic stainless steel, SUS430 compared with the commonly used steel:
1. high chromium content is about 1%, and add molybdenum (Mo), so the steel has good resistance to pitting corrosion, crevice corrosion, stress corrosion, the corrosion resistance in some areas even better than SUS304 and SUS316.
2. titanium (Ti), niobium (Nb), zirconium (Zr) and other stabilizing elements were added. Therefore, the steel has good intergranular corrosion resistance and high temperature oxidation resistance.
Chemical composition
C: less than 0.025 of carbon
Si: Si = 1
Mn: Mn = 1
Sulfur: S = 0.030
P: P = 0.040
Chromium Cr:17.00~20.00
Ni Ni: (less than 0.60)
Molybdenum Mo:1.75~2.50
N: n = 0.025
Ti + Nb Zr + Ti+Nb+Zr:=8*C = 0.8
SUS444 has extremely low carbon and nitrogen impurities
SUS444 added molybdenum elements to improve corrosion resistance
SUS444 adds niobium or titanium elements that have a stabilizing effect
SUS444 overview
1, characteristics
SUS444 steel is high alloy ferritic stainless steel, SUS430 compared with the commonly used steel: 1. high chromium content is about 1%, and add molybdenum (Mo), so the steel has good resistance to pitting corrosion, crevice corrosion, stress corrosion, the corrosion resistance in some areas is even better than SUS304 and SUS316. 2. titanium (Ti), niobium (Nb), zirconium (Zr) and other stabilizing elements were added. Therefore, the steel has good intergranular corrosion resistance and high temperature oxidation resistance. 2, use
1.5 times the yield strength of SUS444 is equivalent to 6 times of carbon steel, steel, glass for seismic resistance, snow, wind resistant, impact resistance and other excellent..SUS444 ferrite stainless steel iron rise above the common herd high coefficient of heat conductivity, about Ni Cr austenitic stainless steel 130% ~ 150%, very suitable for the use of the heat exchange coefficient of thermal expansion. Small teams, only Ni Cr austenitic stainless steel 60% ~ 70%, very suitable for the thermal expansion and contraction, with thermal cycling conditions. The use of plastic, the steel has good toughness, suitable for drawing, rolling forming and stamping manufacturing. Especially the application of corrosion resistance is excellent, high in chloride medium in better corrosion resistance than ordinary ferritic stainless steel austenitic stainless steel and the Olympic Games, generally do not produce chloride stress corrosion cracking. Prior to joining Ni, Ti, Mo yuan, improves the pitting and crevice corrosion. The steel can be welded by welding ordinary stainless steel, which is especially suitable for food processing equipment, heat exchanger, water heater tank, water storage tank, solar energy collecting panel, etc.
SUS444 performance editor
SUS444 has extremely low carbon and nitrogen impurities
SUS444 added molybdenum elements to improve corrosion resistance
SUS444 adds niobium or titanium elements that have a stabilizing effect
Mechanical property
Grades, yield strength, N/mm2 tensile strength, N/mm2 elongation,% hardness, HB/HRB/HV, cold bending, 180 degrees, d=2a
SUS444 typical 31048030160 qualified
SUS444 = 245 = 410 = 20 = 217/ = 96/ = 230, qualified
SUS304 = 205 = 520 = 40 = - 200
SUS316L = 175 = 480 = 40 = - 200
physical characteristics
Grade density g/cm3 magnetic thermal conductivity 100 degrees C, W/m*K thermal expansion coefficient 0~100 degrees C, mm/m*K
SUS444 7.75 has 26.8, 11 '10-6
SUS304 8.03 no 16.2, 16.9 '10-6
SUS316L 7.99 no 16.2, 16 '10-6
The SUS444 density is low and the available area is increased
SUS444 has good thermal conductivity and is easy to heat
SUS444 has less thermal expansion and little welding deformation
Corrosion resistance
1 stress corrosion cracking resistance of chloride ion
Test room accelerated corrosion test method, test standard: GB/T 17898-1999 "stainless steel in boiling magnesium chloride solution stress corrosion test method".
Test materials SUS304, SUS316L, SUS444
The crack initiation time is h 2.5, 9.8 48h without crack
The crack penetration time is h 2.5, 11.8 48h without crack
SUS444 has excellent resistance to chloride ion stress corrosion crackingThe resistance to pitting corrosion of SUS444 is better than that of SUS304
SUS444's resistance to chloride ion pitting is comparable to that of SUS316L
444 there is no intergranular corrosion after welding