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Machinability Rating= (Speed of Machining the workpiece giving 60min tool life)/( Speed of machining the standard metal) Machinability ratings can be used in conjunction with the Taylor tool life equation, =, in order to determine cutting speeds or tool life. It is known that B1112 has a tool life of 60 minutes at a cutting speed of 100 sfpm.
A Rockwell hardness tester. The Rockwell hardness test is a hardness test based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). [1]
Software to compare different tool steel grades based on their properties: Steel-guide EU based on A.I.S.I. norm and Steel-guide GB based on British Steel norm. Suggested tool steel selections for various purposes; Comparison of tool steel standards; Tool Steel Chemical Composition Archived 2009-11-28 at the Wayback Machine
303 is an austenitic stainless steel specifically designed to exhibit improved machinability. 303 SE is austenitic chromium-nickel steel to which selenium has been added to improve machinability and non-galling characteristics. [29] 304L is a low-carbon austenitic chromium-nickel steel designed for special applications. [30]
The machinability of 4340 steel in the annealed condition is rated at 57%, based on AISI1212 (Free cutting, .12% C) as 100% speed reference. [3] Applications
Permit class USS Plunger on the building ways at Mare Island. HY-80 is a high-tensile, high yield strength, low alloy steel.It was developed for use in naval applications, specifically the development of pressure hulls for the US nuclear submarine program and is still currently used in many naval applications.
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Due to the low carbon content (less than 0.03%) [9] maraging steels have good machinability. Prior to aging, they may also be cold rolled to as much as 90% without cracking. Maraging steels offer good weldability, but must be aged afterward to restore the original properties to the heat affected zone. [1]