... ,BX type 2.304,321,347,F5,ocr13,CS,SI ,soft iron.. good quality with best price ring joint gasket/ RTJ gasket ... : ASME B18.20. API, ASNI , EN and so on. MaterialHardnessTemperatureSignHB Soft Iron90540DCarbon Steel120540S410SS170600410304SS160760304316SS160760316347SS160925347 R-Type, Oval Type Standard oval type metal ...