APPLICATIONS
Food processing, brewery and wine making equipment, hot-water tanks, heat-exchanger tubing and automotive components
DESCRIPTION
Type 444 is a low carbon, low nitrogen, ferritic stainless steel that provides pitting and crevice corrosion resistance superior to most ferritic stainless steels. Applications requiring superior corrosion resistance and resistance to chloride stress corrosion cracking are ideal for this alloy.
CHEMISTRY TYPICAL
Carbon: 0.025 max
Manganese: 1.00 max
Silicon: 0.60
Chromium: 17.50-19.50
Nickel: 01.00 max
Molybdenum: 1. 75-2.50
Titanium+ Columbium : 0.20 + 4x (Carbon+ Nitrogen) min-0.80 max
Phosphorus: 0.040 max
Sulfur: 0.030 max
Iron: Balance
PHYSICAL PROPERTIES
Density: 0.28 lbs/in3 7.75 g/cm3
Electrical Resistivity: microhm-in (microhm-cm):
68 ° F (20 ° C): 22.50 (57)
Specific Heat: BTU/lbl° F (kJ/kg•K):
32 – 212 ° F (0 – 100 ° C): 0.102 (0.427)
Thermal Conductivity: BTU/hr/ft2/ft/° F (W/m•K)
At 212 °F (100 °C): 15.5 (26.8)
Mean Coefficient of Thermal Expansion: in/inl° F (µm/m•K):
32 – 212 ° F (0 – 100 °C): 6.1 x 10-s (11.0)
Modulus of Elasticity: ksi (MPa)
29 x 103 (200 x 103) in tension
Magnetic Permeability: Magnetic
Melting Range: 2700 – 2790 ° F (1482 – 1532 °C)
FORMS
Coil – Strip, Foil, Ribbon Wire – Profile, Round, Flat, Square
MECHANICAL PROPERTIES AT ROOM TEMPERATURE
PROPERTIES: ANNEALED
Ultimate Tensile Strength: 60 KSI min (414 MPa min)
Yield Strength (0.2% offset): 40 KSI min (276 MPa min)
Elongation: 22% min
Hardness: Rb 90 max
PROPERTIES: TEMPERED
Type 444 can be rolled to various tempers. Consult Ulbrich Technical Services if temper rolled product is required.
ADDITIONAL PROPERTIES
CORROSION RESISTANCE
Refer to NACE (National Association of Corrosion Engineers) for recommendations.
FINISHES
# 1 – Hot rolled annealed and descaled. It is available in strip, foil and ribbon. It is used for applications where a smooth decorative finish is not required.
# 2D – Dull finish produced by cold rolling, annealing and descaling. Used for deep drawn parts and those parts that need to retain lubricants in the forming process. # 2B – Smooth finish produced by cold rolling, annealing and descaling. A light cold rolling pass is added after anneal with polished rolls giving it a brighter finish than 2D.
#BA- Bright annealed cold rolled and bright annealed
#CBA- Course bright annealed cold rolled matte finish and bright anneal
#2 – Cold Rolled
# 2BA- Smooth finish produced by cold rolling and bright annealing. A light pass using highly polished rolls produces a glossy finish. A 2BA finish may be used for lightly formed applications where a glossy finish is desired in the formed part. Polished – Various grit finish for specific polish finished requirements.
WIRE FINISHES
XC – Extra clean bright annealed or bright annealed and cold rolled Grease – Ultra-bright finish (for decorative applications) Soap – Soap is not removed from tempered wire to act as a lubricant.
COLD FORMING
Type 444 provides excellent formability and can be readily deep drawn and spin formed. Stretch forming, however, is limited in application for this alloy.
HEAT TREATMENT
Type 444 is non-heat treatable.
WELDING
For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining Methods”.
Thanks for your interest in XINYATAI! Whether you’re developing a new product or ramping up production, we’ll be happy to learn more about your specific needs. Please kindly contact with us, and we will promptly get back to you with a quote or, if needed, a request for more information.
