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Carpenter S7 Alloy Tool Steel (AISI S7)
Categories: Metal; Ferrous Metal; Tool Steel; Air-Hardening Steel; Hot Work Steel

Material Notes: Carpenter S7 is a general purpose air hardening tool steel having high impact and shock resistance. It has good resistance to softening at moderately high temperatures. This combination of properties makes it suitable for many hot-work and cold-work applications. It is available as a DeCarb-Free product. DCF bars have been cold finished in the mill, eliminating the need for bar bark removal. Both Carpenter S7 and Bearcat, a trademark of Bethlehem Steel Corp., have the same AISI tool steel designation . . . S7.

Information provided by Carpenter Technology Corporation.

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Physical PropertiesOriginal ValueComments
Specific Gravity 7.83 g/cc
 
Mechanical PropertiesOriginal ValueComments
Hardness, Rockwell C 37 - 40Tempered at 1200°F
 59 - 61As hardened
Tensile Strength, Ultimate 2025 MPawhen tempered at 400°F
Tensile Strength, Yield 1520 MPa
@Strain 0.2 %
when tempered at 400°F
Elongation at Break 10 %when tempered at 400°F
Reduction of Area 28 %when tempered at 400°F
 
Thermal PropertiesOriginal ValueComments
CTE, linear 12.59 µm/m-°C
@Temperature 25.0 - 200 °C
 13.33 µm/m-°C
@Temperature 25.0 - 400 °C
 14.27 µm/m-°C
@Temperature 25.0 - 700 °C
Transformation Temperature 785 °CAc1
 
Component Elements PropertiesOriginal ValueComments
Carbon, C 0.50 %
Chromium, Cr 3.25 %
Iron, Fe 93.85 %As Balance
Manganese, Mn 0.70 %
Molybdenum, Mo 1.4 %
Silicon, Si 0.30 %

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NCARN25 / 15864

Specialty Compounds RTP Company

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