1. Stainless and Nonmagnetic Steel 0Cr13Mn18Ni2MoN Drill collar 2. Steel grade:N1310 3. High quality and ... prompt delivery Stainless and Nonmagnetic Steel 0Cr13Mn18Ni2MoN Drill collar Technique: Hot forged,backfire,annealedFinish: skin,acid cleaning ... explorationBlack forged bar stainless steel round Stainless and Nonmagnetic Steel 0Cr13Mn18Ni2MoN Drill collar