Specifications
API 7-1 Standard Square KellyAPI Spec7
AISI4145H
Professional Technicians,
Considerate Service
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.
="_x0000_i1025">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.
