ASTM seamless steel pipe 1. MTC, API, ISO Certificate Available. 2. Stock, high quality at pretty competitive price. ASTM seamless steel pipe 1. MTC, API, ISO Certificate Available. 2. Stock, high quality at pretty competitive price. Company Name Tianjin Zhonghua Innovatated Steel Tube Commercial Co., Ltd Business TypeMANUFACTURE AND EXPORTERProductCarbon seamless steel pipe Alloy steel pipe ...