We can manufacture Square kelly and hexagonal kelly as per
requirements of customers. They are made of AISI 4142H-4145H forged or rolled
alloy structural steel. Quenching plus tempering thermal treatment will
be conducted over the whole length. Its Brinell hardness can reach 285-341 on
the basis of such thermal treatment. Charpy impact energy: 54J. The formulated process can
ensure that the misalignment of the hole reaches the standard wall thickness.
Kelly bars are manufactured according to the technical code API.