1. Steel plate for pressure vessel: use capital R to indicate at the end of the grade. The grade can be expressed by yield point or carbon content or alloying elements, such as Q345R, Q345. In additional, 20R, 16MnR, 15MnVR, 15MnVNR, 8MnMoNbR, MnNiMoNbR, 15CrMoR, etc. are all represented by carbon content or alloying elements.
2. Steel plate for welding gas cylinders: use capital HP to indicate at the end of the grade, and its grade can be expressed by yield point, such as Q295HP, Q345HP. It can also be expressed with alloying elements, such as 16MnREHP.
3. Steel plate for boiler: use lowercase g to indicate at the end of the brand name. Its grade can be expressed by yield point, such as Q390g.It can also be expressed by carbon content or alloying elements, such as 20g, 22Mng, 15CrMog, 16Mng, 19Mng, 13MnNiCrMoNbg, 12Cr1MoVg, etc.
4. Steel plates for bridges: use lowercase q to indicate at the end of the grade, such as Q420q, 16Mnq, 14MnNbq, etc.
5. Steel plate for automobile beam: use capital L to indicate at the end of the grade, such as 09MnREL, 06TiL, 08TiL, 10TiL, 09SiVL, 16MnL, 16MnREL, etc.
