BÖHLER COLD WORK TOOL STEELS-Heat-treatment Information-WU JII INDUSTRY CO., LTD.-EZB2B taiwan machine tools ＆ autoparts ＆ plastic mold die

21YRS

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.