414 / 416 , Ground Floor, Maulana Azad Road,

Grant Road (East), Mumbai 400 004



Material Notes:

Description: CLC 1.2738 is a 300HB (30HRC) pre-hardened grade specially designed for plastic mold industry. Chromium, Molybdenum, Nickel carbon and manganese additions are optimized to have a fully martensite-bainite microstructure after quenching. The high nickel content (1%) is specially adapted to ensure a perfect homogeneity of structure and hardness through thickness even for very thick blocks (up to 700mm/28"). The steel is melted in electrical furnace and refined with VOD or DH device The cleanliness of the steel is guaranteed as well as the soundness. This makes the steel particularly well adapted for mold even when polishing or chemical etching are required for surface finish quality.

Mechanical Properties
Metric English Comments
Hardness, Rockwell C 300 300 Typical, in Transverse Direction
Tensile Strength, Ultimate 993 MPa 144000 psi Typical, Transverse Direction
Tensile Strength, Yield 826 MPa 120000 psi Typical, Transverse Direction
@Strain 0.200 % @Strain 0.200 %
Elongation at Break 17 % 17 % Typical, EL 5.65 Transverse Direction
Modulus of Elasticity 205 GPa 29700 ksi Typical, in Transverse Direction
Charpy Impact 22.0 J 16.2 ft-lb Typical (Transverse)


Thermal Properties
Metric English Comments
CTE, linear 12.7 µm/m-°C 7.06 µin/in-°F
@Temperature 20.0 - 200 °C @Temperature 68.0 - 392 °F
Thermal Conductivity 29.0 W/m-K 201 BTU-in/hr-ft²-°F
@Temperature 20.0 °C @Temperature 68.0°F


Component Elements Properties
Metric English Comments
Carbon, C 0.40 % 0.40 %
Chromium, Cr 1.9 % 1.9 % As remainder
Iron, Fe 94.683 - 94.7 % 94.683 - 94.7 %
Manganese, Mn 1.5 % 1.5 %
Molybdenum, Mo 0.20 % 0.20 %
Nickel, Ni 1.0 % 1.0 %
Phosphorous, P <= 0.012 % <= 0.012 %
Silicon, Si 0.30 % 0.30 %
Sulfur, S <= 0.0050 % <= 0.0050 %