Special structural steel plate

 Special structural steel plate

　　1. Steel plates for pressure vessels

　　Use a capital R at the end of the grade to indicate that the grade can be expressed by the yield point or by the carbon content or alloying elements. Such as: Q345R, Q345 is the yield point. Another example: 20R, 16MnR, 15MnVR, 15MnVNR, 8MnMoNbR, MnNiMoNbR, 15CrMoR, etc. are all represented by carbon content or alloy elements.

　　2. Steel plates for welding gas cylinders

　　Use uppercase HP at the end of the grade to indicate that the grade can be expressed by yield point, such as: Q295HP, Q345HP; it can also be expressed by containing alloying elements, such as: 16MnREHP.

　　3. Steel plates for boilers

　　Use lowercase g at the end of the grade to indicate. 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 plates for automobile beams

　　Use a capital L at the end of the grade to indicate, such as 09MnREL, 06TiL, 08TiL, 10TiL, 09SiVL, 16MnL, 16MnREL, etc.