High Alloy Materials
Ferritics Alloys 29-4C

Physical Properties of 29-4C Alloys in the Annealed Condition at -20°F to +100°F

      Tensile Strength Yield Strength            
Alloy UNS Desig-nation Spec. psi MPa ksi psi MPa ksi Elongation in 2 in. (min.) % Grain Size Req. Max. Hardness Modulus of Elasticity (x106psi) Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6) Thermal Conductivity (BTU-in/ ft2-h-°F)
29-4C S44735 A268 75,000 515 75 60,000 415 60 10* 100 Rb 28.0 5.2 119

*for 0.049” average wall

Composition of 29-4C tubing and pipe

Grade 29-4C
UNS Designation S44735
Nickel (Ni) 1.00
Chromium (Cr) 28.00–30.00
Iron (Fe) Bal.
Molybdenum (Mo) 3.60–4.20
Titanium (Ti) Max. **
Aluminum (Al) Max.
Cobalt (Co) Max.
Tungsten (W)
Vanadium (V) Max.
Copper (Cu) Max.
Manganese (Mn) Max. 1.00
Niobium (Nb) plus Tantalum **
Carbon (C) Max. 0.030
Nitrogen (N) Max. 0.045
Silicon (Si) Max. 1.00
Sulphur (S) Max. 0.030
Phosphorous (P) Max. 0.040
Other Elements

**(Ti + Cb) 0.20 - 1.00, & 6 (C + N) min

29-4C Product Range

Alloy UNS Designation Werkstoff NR. Specifications*
29-4C S44735 N/A A/SA268

*Note: The specifications noted including ASTM, ASME, or other applicable authorities are correct at the time of publication. Other specifications may apply for use of these materials in different applications.


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