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and API standard Describe: production is divided into two processes, one is friction welding, and the other is integral dr...

..., φ73 ,φ89, φ102, φ114, φ127 ,φ140 ,φ168. And there are two kinds of this products:forged one piece and Friction welding.The normal length of our H...

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... The is the most widely used. The our company produces is mainly upsetted and thicked. The material of the b...

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