4145H Material designation: 4145 H The use of steel for oil drill collar can be used as a weight-increasing drill pipe. The raw material for the overall weight-added drill pipe is AISI 4145H alloy structural steel. The production process strictly follows the SY/T5146-1997 standard. The weighted drill pipe is a medium weight, similar to The drill pipe has a wall thickness larger than that of the drill pipe and is smaller than the drill collar. The thick-walled pipe body is connected with a particularly elongated drill pipe joint, which is generally added between the drill pipe and the drill collar when the drill string is formed. Prevent sudden changes in the drill string section and reduce fatigue of the drill pipe. Used in directional wells, it can be drilled at high speed with low torque, which reduces the wear and damage of the drill string. Because its rigidity is smaller than the drill collar and the contact area of ​​the well wall is small, it is not easy to form the differential pressure card. Drill. Standard: AISI - American Iron and Steel Association Standard Country and Region: USA Steel group: Structural steel sub-category: AISI 4145H Steel Note: Chromium-Molybdenum H-Steel chemical composition(%) Element minimum and maximum approximation C 0.4200 0.4900 Si 0.1500 0.3500 Mn 0.6500 1.1000 P 0.0350 S 0.0400 Cr 0.7500 1.2000 Mo 0.1500 0.2500 |
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