GKH (W-YW) Steel

GKH (W-YW) Steel

Steel name: GKH (W-YW)
Diagram No.: 2237
Mat.No. (Wr.Nr.) designation: 1.7765
DIN designation: 33CrMoV12-9
UNS designation: K24340,
Chemical composition in weight %: 0.29-0.35% C, 0.10-0.40% Si, 0.40-0.70% Mn, max. 0.015% P, 0.007% S, 2.80-3.30% Cr, 0.70-1.20% Mo, max. 0.030% Ni, 0.15-0.35% V
Steel group: Martensitic steels
Properties: Increasing numbers of industrial components are being subjected to high surface stresses and dynamic loads, requiring the use of special high-performance steels. Where high surface hardness and excellent fatigue strength are required and when the material is also subjected to high temperatures, nitriding technology offers the best case hardening option.
Applications: In this field, GKH offers an excellent combination of core properties to withstand structural loads and damage tolerances and surface functions in the case hardened layer. The result on components gives one of the best solutions in the market for contact pressures and fatigue performances.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: 920 C, 1688 F, oil quenching.
Tempering: 625 C, 1157 F, mean grain size: >7 ASTM.
Diagram note: Typical value obtained on heat treated blanks (heated at 900-925°C, 1652-1697°F and oil quenched).

Mechanical Properties - Tempering Temperature

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CCT and TTT Diagrams of Steels
CCT and TTT Diagram Calculating Service
Hardenability Diagrams of Steels
Hardenability Calculating Service
Macro Defects in Steel
Metal Etchants
Non-Metallic Inclusions in Steel
Semiconductor Etchants

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