Drill String Cross-over Sub
Drill String Cross-over Sub
Creation time:2019-05-10 09:30
According to API Specification, Drill String Cross-over Sub is made from AISI4145H modified chromium molybdenum alloy steel. ZSSC has manufactured three types of subs: Straight OD Subs, Reduced Section Subs and Left Hand Subs. All threads are cold worked, copperized, and phosphated.
Types of drill string cross-over sub
Mechanical property for drill string cross-over sub
|
Outer diameter mm（inch） |
σb MPa Tensile intensity |
σ0.2 MPa Yield intensity |
σ4 % Elongation |
Akv J Impact value |
HB Hbrinell hardness |
|
79.4-175 (3 1/8 6 7/8) |
≥965 |
≥760 |
≥13 |
≥54 |
≥285 |
|
178~254（7~10） |
≥930 |
≥690 |
≥277 |
