High Quality Carbon Steel Drill Pipe 1.OD: 10.3- ... ,B,X42,X46,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe( ... seam inspection. We strictly carry out API spec Q1 quality control system and API Spec 5DP production standard. We have a ... Our API drill pipes are of high physical property, for their strictly controlled processing of sulphur and phosphorus.To ensure ...