18CrNiMo7-6 Steel - Hardenability Diagram

18CrNiMo7-6 Steel

Steel name: 18CrNiMo7-6
Diagram No.: 1704
DIN designation: 18CrNiMo7-6
AISI/SAE designation: 6587
Mat.No. (Wr.Nr.) designation: 1.6587
Chemical composition in weight %: 0.15-0.21% C, max. 0.35% Si, 0.50-0.90% Mn, max. 0.025% P, max. 0.025% S, 1.50-1.80% Cr, 1.40-1.47% Ni, 0.25-0.35% Mo
Steel group: Case hardening steels
Applications: Gear parts exposed to highest stresses and wear conditions. Typical components include gears, planetary gears, plate wheels, drive pinions and shafts.
Comment: The minimum tempering time is 1 hour, but a tempering period of 1 hour per 25mm of section is recommended. If the steel is to be direct hardened, then in general, a carburizing temperature of 950°C is not to be exceeded. After case hardening a typical surface (case) hardness of 62 HRC can be achieved. Gas carburizing for 2 hours at 925°C results in 0.8mm case depth, whilst carburizing for 24 hours at 925°C results in 3.1mm case depth.
Reference: Not shown in this demo version.

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Hardenability Diagram

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Other Steel Data links:
Carbides in Steel
CCT and TTT Diagrams of Steels
CCT and TTT Diagram Calculating Service
Hardenability Calculating Service
Macro Defects in Steel
Metal Etchants
Non-Metallic Inclusions in Steel
Semiconductor Etchants
Transformation Diagrams of Non-Ferrous Alloys
Tempering Diagrams of Steels

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