Cr-Mo-W-V-Co Steel

Cr-Mo-W-V-Co Steel

Steel name: Cr-Mo-W-V-Co
Diagram No.: 1615
Chemical composition in weight %: See the table
Steel group: Medium chromium secondary hardening steels
Properties: These alloys were melted using pure starting materials in a vacuum induction furnace and then cast in copper chill molds as 9 kg cylindrical ingots 6.4 cm in diameter. The ingots were upset and cross forged at 1 200°C to bars 7 cm wide and 1.75 cm thick. The forged bars were sand blasted and then homogenized at 1 200°C in vacuum for 24 h and then furnace cooled. Specimen blanks were cut from the homogenized bars after they had been softened by tempering at 650°C for 2 h. Specimen blanks 7 cm x 1.75 cm x 2.5 cm were austenitized for 1 h in an argon atmosphere in a vertical tube furnace and quenched in oil. Austenitizing temperatures of 1 000°C, 1 050°C, 1 100°C and 1 200°C were used. These blanks were then tempered for 1 h in neutral salt baths and then water quenched. The tempering temperatures used were 200°C, 300°C, 400°C, 500°C, 550°C, 600°C and 650°C. The Rockwell C scale (Rc) hardness values were taken from specimens cut from the tempered blanks using an abrasive saw run at a slow speed under conditions of flood cooling. The reported hardness values are the average of five hardness measurements.
Applications: No data
Note: The room temperature hardness (Rc) plotted as a function of tempering temperature for the base alloy and the modified alloys for austenitizing temperatures of (a) 1 000°C. (a) 1 050°C, (a) 1 100°C and (a) 1 200°C.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: See the text
Tempering: See the text

Tempering Diagrams

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Non-Metallic Inclusions in Steel
Semiconductor Etchants

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