W321 Steel

W321 Steel

Steel name: W321
Diagram No.: 2277
Mat.No. (Wr.Nr.) designation: ~1.2885
DIN designation: ~X32CrMoCoV3-3-3
AFNOR designation: (30DCKV28)
UNI designation: ~30CrMoCoV12-30-12 KU
Chemical composition in weight %: 0.39% C, 0.30% Si, 0.35% Mn, 2.90% Cr, 2.80% Mo, 2.90% Co
Steel group: Hot work tool steels
Properties: Hot work tool steel exhibiting fine heat checking resistance, superior hot tensile and good impact properties; admits water cooling. Cobalt enables the steel to perform under high duty conditions.
Applications: Highly stressed hot work tools, mainly for the processing of heavy alloys, such as mandrels, dies and containers for metal tube and rod extrusion; hot extrusion tools; tools for the manufacture of hollows, screws, rivets, nuts and bolts. Die casting tools, forming dies, die inserts, hot shear blades.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: 1000 to 1070°C (1832 to 1958°F) Oil, salt bath (500-550°C / 932-1022°F), Holding time after temperature equalization: 15 to 30 minutes. Obtainable hardness: 52 - 56 HRC.
Tempering: Slow heating to tempering temperature immediately after hardening / time in furnace 1 hour for each 20 mm of work piece thickness but at least 2 hours / cooling in air. It is recommended to temper at least twice. A third tempering cycle for the purpose of stress relieving may be advantageous 1st tempering approx. 30°C (86°F) above maximum secondary hardness. 2nd tempering to desired working hardness. The tempering chart shows average tempered hardness values. 3rd for stress relieving at a temperature 30 - 50°C (86 to 122°F) below hig hest tempering temperature.
Diagram note: Hardening temperature: 1050°C (1922°F) Specimen size: square 50 mm.

Tempering Diagram

Price: 20.00 US $
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CCT and TTT Diagram Calculating Service
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Hardenability Calculating Service
Macro Defects in Steel
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Non-Metallic Inclusions in Steel
Semiconductor Etchants

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