LIUZHOU LIAN UNITED KNIVES CO.,LTD.

M42 High Speed Steel

Time:2015-10-26 Read: Steve.Cheng
This grade is a cobalt molybdenum high speed steel which achieves a high hardness and superior hot hardness. Excellent cutting performance can be achieved from tools made in M42 high speed steel. With the high heat treated hardness of up to 70 Rockwell M42 high speed steel also offers excellent wear resistance. Typical Analysis Carbon 1.05% Silicon 0.35% Tungsten 1.50% Chromium 3.75% Vanadium 1.15
This grade is a cobalt molybdenum high speed steel which achieves a high hardness and superior hot hardness. Excellent cutting performance can be achieved from tools made in M42 high speed steel. With the high heat treated hardness of up to 70 Rockwell M42 high speed steel also offers excellent wear resistance.
 
Typical Analysis
Carbon 1.05% Silicon 0.35%
Tungsten 1.50% Chromium 3.75%
Vanadium 1.15% Molybdenum 9.50%
Cobalt 8.00%
 
Applications
M42 high speed steel can be used in conditions where the demand for hot hardness is important. Commonly used for cutting tools including twist drills, taps, broaches tools, milling cutters, reamers, end mills, bandsaw blades, cold work tools.
 
Hardening
For best results harden the M42 in a vacuum or controlled furnace, or in a properly rectified salt bath. Pre heat the steel thoroughly to 820-870°C then transfer to the high temperature salt bath or furnace. The exact hardening temperature to use for M42 will depend on the type of work being treated, but in general components should be hardened from the range of 1160-1180°C in salt, or 1180-1190°C in atmosphere or vacuum furnaces. After a short hold at the hardening temperature, quench the component without further soaking into salt at 540-595°C or warm oil. If salt quenched allow the component to equalise at the bath temperature and then complete the quench in still air.