• To be strictly controlled under API Spec - 7 latest version
• Have reached both superior Resistance to Stress Corrosion Cracking, higher mechanical property and excellent magnetic permeability.
• Relative Magnetic Permeability: ¡Ü1.010, according to ASTM A343-64 No.4
• Field Gradient Measurement: ¡Ü¡À0.05 Micro Tesla/100mm
• Resistance to stress corrosion meets ASTM 262 Practice E
Mechanical Properties and Tests Standard
Drill Collar OD Range,inchees
Minimum Yield Strength psi
Minimum Tensile Strength psi
Elongation, Minimum, With Gauge Length Four Times Diameter percent
