It is made from high-class low carbon stainless steel, and completely meets the requirement of API Spec 7-1 and SY/T5144 Standard. It has good low magnetic permeability, high mechanical property and perfect enduring intergranular corrosion cracking performance. It is mainly used for the inspection in the process of petroleum drilling, and the structure is the same with the ordinary drill collar. Magnetic permeability (MPS=1×105/4∏A/m) 1. Average: Ur<1.010
2. Magnetic Field Gradient: ΔB≤0.05μT
Advantage: 1) Good quality and competive price
2) Certified by API
3) Use for well drilling
4) Delivery on time
5) Size according to your request
6) Drill collar, stick drill collar, non-magnetic drill collar, spiral drill collar covering all size. Specification: 1) standard: AISI 4145H and API Spec.7
2) Code: NCXX, IIF, REG
3) O.D:4 3/4 -11inch
4) I.D:2-3 inch
5) Lenghth:9150mm,9450mm
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