What is KE672 tool steel? What is KE672 tool steel? RPstress (Aerospace) (OP) 2 Feb 06 09:24 This may be an older UK spec. It's listed by some suppliers, but I can't find any composition or hardness, etc.Can anyone help? RE: What is KE672 tool steel? geoffthehammer (Mechanical) 2 Feb 06 09:45 If I remember correctly, KE stood for Kaiser Ellison - They were a Sheffield (UK) company who made specialist steels.An old catalogue I have shows:KE 672 is (was) a Non-Shrinking Oil Hardening Tool steel to BS 4659:1971:BO1Composition: 0.85-1.00 % Carbon0.4% max Silicon1.10-1.35 % Manganese0.4-0.6% Chromium0.4-0.6 % Tungsten0.25% max VanadiumUsed for press tolls, knives, punches, dies gauges, moulds etc. RE: What is KE672 tool steel? RPstress (Aerospace) (OP) 2 Feb 06 09:49 Thanks, geoffthehammer. That's exactly what I needed.-RP.