ASTM A285 is an ordinary carbon steel used for fusion welding of pressure vessel equipment, such as A709 grade 50 low alloy steel sheet boilers, storage tanks, heat exchangers, etc. The tensile strength of the three steel grades (Grade A, Grade B, and Grade C) ranges from 310-515Mpa, and ASTM A285 steel plates are usually delivered in the rolled state. According to user requirements, A709 grade 50 low alloy steel sheet is produced by processes such as compaction, semi-compaction, edge sealing and boiling water.
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 A709 grade 50 low alloy steel sheet, 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 A709 grade 50 low alloy steel sheet, 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.
In actual processing applications, the processing A709 grade 50 low alloy steel sheet thickness of flame cutting ranges from 6 to 200 mm, and the A709 grade 50 low alloy steel sheet cutting thickness can even reach 350 mm by replacing the air pipe and cutting torch nozzle. In order to better improve the cutting quality, the related process parameters will be slightly different when using flame cutting for materials of different thickness. The verticality of the cutting surface processed by the CNC flame cutting machine is generally high, and the slope can be controlled below 2-3°. The characteristic is that flame cutting performs better when cutting A709 grade 50 low alloy steel sheet with a certain thickness above 10mm.
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