JFE443CT
Eco-friendly, high-corrosion resistance ferritic stainless steel
<Composition> 21Cr - 0.4Cu - Ti - ultra-low (C,N) (SUS443J1)
Corrosion resistance
Weldability
Mechanical properties
- Totally Ni-free and Mo-free, yet with corrosion resistance as good or better than SUS304.
- No added Ni and Mo means eco-friendly performance and excellent price stability, even when Ni or Mo prices rise sharply.No added Ni and Mo means eco-friendly performance and excellent price stability, even when Ni or Mo prices rise sharply.
- High chromium content of 21% results in outstanding corrosion resistance, as good or better than SUS304.
- Obtain JIS certification as SUS443J1 on 2010
Applications
Used in a wide range of applications as a substitute for SUS304.
| Building Construction | Roofing, architectural hardware, elevators, escalators, decorative piping, curtain rails, seismic isolation expansion |
|---|---|
| Industrial machinery | Ducts, semiconductor and LCD manufacturing equipment, communications equipment housing, measuring instruments, air conditioners, control panels, drum cans, punching metal, thermostats |
| Transportation vehicles and equipment | Refrigerated containers, automobile parts |
| Kitchen equipment | IH pots, sinks, ranges, range hoods, BBQ grills, seasoning containers |
| Household items | Mailboxes, trash cans, clothes drying poles and stands, shopping cart gates |
| Electrical products | Refrigerated cases, dishwashers, electric rice cookers, microwave ovens |
Gutter fittings
Architectural fittings
Elevators
Drum cans
Ashtray stands
Thermostats
Muffler parts
Pots and pans
BBQ grills
Mailboxes
Trash cans
Clothes drying poles and stands
Shopping cart gates
Chemical composition
SUS443J1 boasts a totally nickel-free and molybdenum-free composition, with a high chromium (Cr) content of 21% and added copper (Cu) and titanium (Ti) to boost corrosion resistance.
〈Typical values %〉
| Mechanical properties | Cr | Ni | Cu | Ti | Nb | |
|---|---|---|---|---|---|---|
| JFE | JIS | |||||
| JFE443CT | SUS443J1 | 21.0 | − | 0.4 | 0.3 | − |
| SUS304 | 18.2 | 8.2 | − | − | − | |
| JFE430CuN | SUS430J1L | 19.2 | − | 0.5 | − | 0.4 |
| SUS430 | 16.1 | − | − | − | − | |
Mechanical properties
The estimated effective yield strength of 0.2% for SUS443J1 is equal to or higher than that of SUS304. This means SUS443J1 can be substituted for SUS304 at the same plate thickness.
〈Typical values：0.8mm〉
| Standards | 0.2% yield strength （N/mm²） |
Tensile strength （N/mm²） |
Elongation （％） |
Hardness （Hv） |
Average r value | Bendability (Bending angle 180°) |
|
|---|---|---|---|---|---|---|---|
| JFE | JIS | ||||||
| JFE443CT | SUS443J1 | 305 | 483 | 31 | 153 | 1.3 | Good（r＝0t） |
| SUS304 | 260 | 645 | 60 | 176 | 1.0 | Good（r＝0t） | |
| JFE430CuN | SUS430J1L | 356 | 496 | 29 | 158 | 1.3 | Good（r＝0t） |
| SUS430 | 320 | 490 | 29 | 164 | 1.0 | Good（r＝1t） | |
r=0t Adhesion bending
Physical properties
In comparison to SUS304, SUS443J1 offers the following advantages.
Approx. 40% better thermal conductivity
Approx. 40% less thermal expansion
Less deformation during welding.
Less deformation due to temperature changes during use.
- Approx. 2.5% lower density for lighter weight.
- Due to its magnetism, it can be used with magnetic sorting and handling.
Very well suited for use with IH pots and other electromagnetic cookers.
| Standards | Density （g/cm³） |
Elec. resistance （10-6Ω・cm） |
Magnetism | Specific heat 25℃ （J/kg・℃） |
Thermal conductivity 100℃ （W/m・℃） |
Coeff. of thermal expansion 20〜100℃ （10-6/℃） |
Young’s modulus （GPa） |
|
|---|---|---|---|---|---|---|---|---|
| JFE | JIS | |||||||
| JFE443CT | SUS443J1 | 7.74 | 58 | Yes | 440 | 22.5 | 10.5 | 204 |
| SUS304 | 7.93 | 70 | No | 500 | 16.2 | 17.3 | 193 | |
| JFE430CuN | SUS430J1L | 7.73 | 61 | Yes | 460 | 24.0 | 10.5 | 203 |
| SUS430 | 7.70 | 60 | No | 460 | 26.1 | 10.4 | 200 | |
Mechanical properties
Various salt water spray test results
Exposure test results
In a 4-year atmospheric exposure test in Okinawa, JFE443CT (SUS443J1) demonstrated a corrosion resistance superior to that of SUS304.
Formability
Workabiliity is on a par with that of SUS304
1．Superior drawability, inferior overhang characteristics.
2．Season cracks do not occur even when machining with large strains.
3．Work hardening is minimal. This offers the advantage of lower work loads when shearing or press forming.
Comparison of limiting draw ratio (LDR)
SUS443J1 enables deeper drawability than SUS304
| SUS304 LDR=2.21 |
SUS443J1 (JFE443CT) LDR=2.36 |
|---|---|
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Comparison of 8-stage drawing results (blank diam. 84 mm, thickness 0.8 mm)
SUS443J1 was drawn without problems, whereas SUS304 failed due to season cracking.
| SUS304 | SUS443J1(JFE443CT) |
|---|---|
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Weldability
1. SUS443J1 retains good corrosion resistance and mechanical properties even after TIG welding.
- Y316L is recommended as a filler metal (welding rod, welding wire).
- Use a filler such as Y316L when welding with SUS304 to prevent deterioration of corrosion resistance.
- Avoid welding with SUS430 because it reduces corrosion resistance.
2. Excellent with MIG, MAG, and spot welding.
Impact of welding rods on the corrosion resistance at TIG-welded parts of SUS443J1.
1. Welded parts show as good corrosion resistance as parent metal both without welding rods and with Y316L welding rods.
2. With Y308 welding rods the corrosion resistance of welded parts deteriorates, resulting in rust.
| No welding rod | Y308 application | Y316 application |
|---|---|---|
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[Test conditions] Thickness 0.8 mm, Wet-dry cyclic corrosion test (JASO-CCT) 30 cycles
Inspection Certification
(1) On the basis of an exposure test, JFE443CT eco-friendly, high-corrosion resistance stainless steel (2B, #800 and HL finish) is judged to have acorrosion resistance equivalent to or better thanSUS304 stainless steelof the same finish.
| Certification authority | The Building Center of Japan |
|---|---|
| Certification date | July 24th, 2012 |
| Certification No. | BCJ-Inspection Certificate-199 |
| Name of technology | Anti-corrosion technology utilizing 21% chromium stainless steel “Eco-friendly high-corrosion resistance stainless steelJFE443CT (2B, #800 and HL finish)” |