Profile: Rawalwasia Ispat Udyog (P) Ltd. is an ISO 9001:2000 certified company that produces electric resistance welded (erw) black, galvanized steel pipes/tubes in a size range of 15mm. n.b. to 150mm n.b. in the light, medium and heavy classes of highest quality, confirming to is: 1239 (part-1) 2004, rigid in-process quality control is maintained at every stage of the production right from the purchase of raw material to the finished products.