A flat washer is also called a flat washer, which is mainly stamped out of an iron plate. The shape is generally a flat washer with a hole in the middle. The size of this hole is generally determined according to customer requirements.
There are 9 standards for flat washers in my country. From 2000 to 2002, GB/T97.3-2000, GB/T5286-2001, GB/T95-2002, GB/T96.1-2002, GB/T96.2 were approved and issued respectively. －2002, GB/T97.1-2002, GB/T97.2-2002, GB/T97.4-2002 and GB/T5287-2002 and other flat washer standards.
According to the performance level of flat washers, the author recommends the use of materials:
For 100HV grades, ST12, ST13 and Q235, Q215, Q195, etc. can be used, and the surface hardness can reach about 110HV.
For 140HV grades, 08F, 08Al and 10, 10F, etc. can be selected, and the surface hardness can reach about 140HV.
For 200HV and 300HV grades, 45, 50, 60, 70 steel or 65Mn steel should be selected, which can be quenched and tempered by heat treatment to reach the technical requirements of 200-300HV and 300-400HV.
According to the standard, flat washers of 100HV and 140HV grades can be made of low carbon steel. Most companies generally use Baosteel materials when selecting materials, which is convenient for cold stamping.