... to both seamless and welded steel line pipe. OSUN supplies pipes with plain-ends, with ends suitable for threading as well ... with special couplings.OSUN can supply different materials pipes according to API - API 5L Gr.A/B,X42,X46,X52,X56,X60 ... ,X65,X70,X80,X95,L245,L360,L290, etc X52 API 5L Pipes