HENAN WEIN INDUSTRY CO.,LTD

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	spiral heavy weight drill pipe wholesale Integral heavy weight drill pipe is made from AISI 4145H alloy steel.acc.to API Spec.7 and SY/T5144. It is formed by hot forged and fully heat-treated.There is wear resistance hard banding on tool joints connections and central upset.The types of har...	2017-12-10

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