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美国的Woods钢铁产品公司已开始出售一种涂有聚合物的抽油杆接箍。接箍材料为低碳镍/铬钢(AISI8615),冷滚压接箍螺纹。其屈服强度等于或高于APID级标准,但其
Woods Iron and Steel Products Company of the United States has begun to sell a polymer coated sucker rod coupling. The coupling material is low carbon nickel / chrome steel (AISI8615), cold rolled crimp ferrule. Its yield strength is equal to or higher than the APID standard, but its