What is S420ML grade equivalent HS code

"BBN Steel Q345D hot rolled plates stock 202019.05*2050*10800, 27.5*3600*12000, 28.58*2172*12500, 48*3000*12813, 19.05*2185*12200, 22*3730*12100, 22.23*2080*12000, 55*1800*3200, 22.23*2178*12200, 24*2470*12800, 19.05*2187*12200, 27.5*3735*12000, 22.23*2181*12200, 59*2950*10000, 28.58*2171*12500, 16*1800*6860, 28.58*2172*12000, 16*1730*9500, 44*3000*5000, 14*1700*6970, 19*2185*11500, 14*1440*9700, 60*2950*10000(mm).

20G steel is boiler steel, which is similar to No. 20 carbon steel. The difference is that 20G steel has higher and stricter inspection standards than S420ML grade equivalent, No. 20 carbon steel for harmful impurities and internal defects. That is to say, 20G steel is specially produced for boiler pressure vessels. It is special purpose "No. 20 carbon steel". The use of 20G steel to make boilers is not because it is more resistant to burning than other steels such as S420ML grade equivalent, but because of its strength, toughness, ductility, weldability, temperature influence, fatigue fracture, price and cost, etc. 20G steel is most suitable for use in medium and low pressure boilers.

Expression method of pressure coefficient of seamless steel pipe: pressure P < 7MPa coefficient S-8 7 < S420ML grade equivalent steel pipe pressure P < 17.5, coefficient 5-6 pressure P > 17.5, coefficient S-4 seamless pipe production and manufacturing: tube blank -- Inspection -- peeling -- Inspection -- Heating -- perforation -- pickling -- grinding -- lubrication and air drying -- welding head -- cold drawing -- solution treatment -- pickling -- pickling and passivation -- Inspection -- cold rolling -- degreasing -- air drying -- internal polishing -- one external polishing -- Inspection -- identification of finished S420ML grade equivalent product packaging.

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