01How does Kaiyue control the raw material quality of CUBEX roller cone drill rod?
All steel materials are purchased from qualified large steel mills, and each batch is inspected after arrival before it is released for production.
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02What steel is used for the body of CUBEX roller cone drill rod?
Body material is selected for the specific model, connection, and working conditions, and must match the approved product specification and quality records.
03Why are the pipe ends of CUBEX roller cone drill rod upset and thickened?
The upset ends increase the friction-welding contact area, helping improve joint strength and reduce the risk of connection fracture.
04How are the friction-welded areas of CUBEX roller cone drill rod treated?
All friction-welded areas are tempered after welding to reduce internal stress and improve long-term structural stability.
05What material is used for the coupling of CUBEX roller cone drill rod?
Coupling material and heat treatment are selected for the specific model and operating conditions and must match the approved product specification and inspection records.
06How is the coupling hardness verified?
Core and surface hardness must be tested against the inspection specification for the corresponding model. The approved technical document and batch quality record define the applicable range.
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