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Features and Uses of EN30B
This is a high carbon version of EN30B, the increased carbon content allowing
higher hardness levels to be
achieved after heat treatment. The steel can be either oil or air hardened and
exhibits minimum distortion in heat
treatment.
This steel can be used for many purposes where toughness and high tensile
strength are required. One of the
main uses is for plastic moulds, but it has may other applications for example:
components of small presses
including anvils, collars, strikers or hammers, rams or punch holders. Other
applications include rivet snaps, air
hardening cold chisels, crimping tools, clutch keys, racks, pinions and angle
pins for pressure die casting tooling.
Available Forms
Heat Treatment
For best results, tools should be stress relieved, 610/630°C,
prior to hardening. Hardening should be carried out
by pre-heating at 300/400°C prior to raising the temperature uniformly to
830/850°C. When thoroughly soaked
at this temperature either cool in air or oil quench.
Tempering
Tools should be tempered as soon as possible after hardening,
preferably whilst still hand warm, by re-heating to
the appropriate temperature as determined from the tempering curve, and soaking
for at least 2 hours per inch of
ruling section. Withdraw from the furnace and allow to cool slowly in air.
Tempering between 275/450°C is not advised as it will seriously reduce the
impact values obtained.
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