non-magnetic drill collar 1. chrome manganese low carbon austenitic alloy 2. perfect mechanical properties

   Materials of SFMC Non-magnetic drill collar s are made from chrome manganese low carbon austenitic alloy, which has following characteristic,

strictly controlled chemical composition during the refining and forging processexcellent lower magnetic permeability, high strength of mechanical properties and outstanding resistance to stress corrosion cracking and no tendency to galling

Mechanical properties,

SFMC Non-magnetic has the listed mechanical properties along its overall length.

Size OD (in)	Yield Strength σ0.2 MPa(psi)	Tensile strength σb MPa(psi)	Elongationδ4 %	Reduction of area %	Impact AKV ft.lb
3-1/8~6-3/4	≥758(110,000)	≥827(120,000)	≥18	50	≥50
7~10	≥689(100,000)	≥758(110,000)	≥20	50	≥50

Non-magnetic properties,

Magnetic permeability(when MPS=1×105/4πNm),

1. relative Max, 1.010   2. Average,μr≤1.005

Magnetic field gradient (hot spots),  Max: B≤0.05 micro Tesla/100mm

Types of SFMC Non-magnetic products,

1. Drill Collars 

2. Short Drill Collars 

3. Heavy Wall Drill Pipe 

4. Crossover Subs 

5. Integral Stabilizers

non magnetic drill collar