碳素钢(国外英文资料).docVIP

碳素钢(国外英文资料) The steel number is arranged in a small scale, its mechanical strength gradually increases, and the plasticity and cold bending performance decreases, and the weldability also decreases with the increase of carbon content. Carbon steel refers to iron carbon alloys that are less than 2% carbon and contain small amounts of silicon, manganese and impurities such as phosphorus and sulphur. The carbon content of carbon steel used in industry is usually no more than 1.4%. This is because the carbon content of more than this amount, steel is very hard and brittle, so have a tendency to smaller ductile-brittle, and join the c element can effectively protect the iron react with O, so there is a certain resistance to atmospheric corrosion Carbon steel means less than 2% carbon, and a small amount of silicon and manganese, as well as the standard material for iron and carbon alloys such as phosphorus and sulfur. The carbon content of carbon steel used in industry is usually no more than 1.4%. This is because after the amount of carbon is exceeded, the steel is hard and brittle, and it is difficult to process, lose production and use value. Carbon steel is divided into ordinary carbon structural steel and high quality carbon structural steel type ii. High quality carbon structure steel stipulates that the content of sulfur and phosphorus is lower than ordinary carbon steel, so the overall mechanical performance is better than plain carbon steel. Carbon steel representation method; Number: Q + digit + quality grade symbol? Deoxygenation method notation For example: Q235A? F Q for yield strength, 235 for yield strength, A for grade A, F for boiling steel. Q235A? F - the yield strength is 235N/mmsup 2; Grade A is of high quality. In addition to carbon, carbon cast-iron has a small amount of silicon, manganese, sulfur, phosphorus and other impurities. The quality can be divided into ordinary carbon steel and high quality carbon steel. (1) ordinary carbon steel, also kn