competitive price drill collars

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Tianjin Shiruida Machinery Import and Export Company of China competitive price drill collars

Tianjin Shiruida Machinery Import and Export Company of China

 
 
 

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competitive price drill collars - Dec, 04 2009

The collars are made of AISI 4145H forging or finish rolling alloy structural steel.
The drill collar are trepanned and drifted to API Spec 7.Grinding crafts adopted finish boring technology eliminates regions of the weld stress concentration, making welding appearance more perfect, and increasing their life. The full length thermal treatment ensure the mechanical performance fullfil even exceed API Spec 7 requirements.


Non-magnetic drill collars adopts a kind of chrome manganese alloy steel as material, low carbon obtained by combining a proprietary chemiical analysis and rotary hammer process. The material is resistant to corrosiionn crack, with low magnetic conductivity, with no tendency to galling and high wearproof performances.
The drill collars are made of AISI 4145H forging or finish rolling alloy structural steel. Trepanned and drifted to API Spec7.

Company Name : Tianjin Shiruida Machinery Import and Export Company of China