440B is a highly corrosion resistant steel with decent toughness. Although it is an older alloy it can still take a good edge, polish well and achieve decent hardness at approx 58/59Hrc. This batch has a higher carbon level at around 0.93%, just below 440C.
2.3mm thickness is supplied in 700mm lengths
3.3mm and 4.2mm thicknesses are supplied in 800mm lengths