In the era of commercial wrought iron, blooms were slag-riddled iron castings poured in a bloomery before being worked into wrought iron. In the era of commercial steel, blooms are intermediate-stage pieces of steel produced by a first pass of rolling (in a blooming mill) that works the ingots down to a smaller cross-sectional area, but still greater than 36 in2 (230 cm2)

Our ordinary grades are:
ASTM A615 Gr60
BS 4449 B500B CK 45
RSt 37-2
St 3sp St 3sp St 44-2
St 5sp 2
ISIRI 3132 Aj 400