Shear steel was of non uniform quality and a better process was needed for producing watch springs, a popular luxury item in the 18th century.
2.
The bars were then shortened, bound, heated and forge welded together to become " shear steel " . It would be cut and re welded multiple times, with each new weld producing a more homogeneous, higher quality steel.
3.
Blister steel was made from wrought iron by packing wrought iron in charcoal and heating for several days . See : Cementation process The blister steel could be heated and hammered with wrought iron to make shear steel, which was used for cutting edges like scissors, knives and axes.
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