17YRS
WU JII INDUSTRY CO., LTD.
886-4-23593510
886-4-23593529
No. 1, 20th Rd., Industrial Park, Taichung City, Taiwan
www.wujii.com.tw

Products

Heat-treatment Information
BÖHLER COLD WORK TOOL STEELS
K105

Properties

High carbon, high chromium (12%Cr) steel with minimum dimensional change. Particularly suitable for air hardening. Good thoughness.

Application

High-duty cutting tools (dies and punches), blanking and punching tools, woodworking tools, shear blades for cutting light-gauge material, thread rolling tools, tools for drawing deep drawing and cold extrusion, pressing tools for the ceramics and pharmaceutical industries, cold rolls (working rolls) for multiple- roll stands, measuring instruments and gauges, small moulds for the plastic industry where excellent wear resistance is required.

Specification

Heat treatment

Hot forming 
forging

1050 to 850°C 
Slow cooling in furnace or thermo insulating material.

Annealing

800 to 850°C 
Slow controlled cooling in furnace at a rate of 10 to 20 °C/ hr down to approx. 600°C, further cooling in air. Hardness after annealing: max. 250 HB

Stress relieving

650 to 700°C 
Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes.  After  through heating, hold in neutral atmosphere for 1-2 hours.

Hardening

980 to 1010°C 
Oil, salt bath (220 to 250°C or 400 to 450°C), air blast, still air. 
Tools of intricate shape or with sharp edges should preferably be hardened in air or salt bath. 
Holding time after temperature equalization:15 to 30 minutes. 
Obtainable hardness: 64-66 HRC

Tempering

Slow heating to tempering temperature immediately after hardening/time in furnace 1 hour for each 20mm of workpiece thickness but at least 2 hours/cooling in air. 
For average hardness figures to be obtained please refer to the tempering chart. 
For certain cases we recommend to reduce tempering temperature and increase holding time.

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