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目前,无缝钢管厂生产的石油管,是按照部标(YB239-63,钢级DZ40)生产的。在钢管的性能、表面质量、丝扣的密封性和连接强度、包装标志以及钢质的化学成分等方面,都满足不了石油工业发展的需要。以美国API标准(美国石油学会标准)代替YB239-63生产石油管,是石油工业用管立足于国内、减少进口、节省外汇、提高经济效益的重要措施之一。但是,按
At present, the seamless pipe plant production of petroleum pipe, is in accordance with the Ministry of standard (YB239-63, steel-grade DZ40) production. In the performance of steel, surface quality, threaded sealant and connection strength, packaging marks and steel chemical composition, etc., can not meet the needs of the development of the oil industry. The United States API standards (American Petroleum Institute standards) instead of YB239-63 production of petroleum pipe, oil industry pipe based on the domestic, reducing imports, saving foreign exchange, improve economic efficiency, one of the important measures. But press