... industries. OSUN applies this specification to both seamless and welded steel line pipe. OSUN supplies pipes with plain-ends, with ends suitable ... for use with special couplings.OSUN can supply different materials pipes according to API - API 5L Gr.A/B,X42,X46 ... ,X56,X60,X65,X70,X80,X95,L245,L360,L290, etc Seamless 5L Pipes