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Flat washer is mainly punched out of iron plate. The shape is generally a flat washer with a hole in the middle. This hole size specification is generally determined according to customer requirements.
There are 9 standards for plain washers in China. gb/t97.3-2000, gb/t5286-2001, gb/t95-2002, gb/t96.1-2002, gb/t96.2-2002, gb/t97.1-2002, gb/t97.2-2002, gb/t97.4-2002 and gb/t5287-2002 were approved and issued respectively, also DIN125 and ANSI standard.
According to the performance grade of plain washer, the author recommends the following materials:
For 100hv grade, ST12, ST13, Q235, Q215, Q195, etc, can be selected, and the surface hardness can reach about 110hv;
For 140hv grade, 08F, 08Al, 10, 10F, etc, can be selected, and the surface hardness can reach about 140hv;
For grade 200hv and 300hv, 45, 50, 60, 70 steel or 65Mn steel shall be selected, which can meet the technical requirements of 200 ~ 300hv and 300 ~ 400hv through heat treatment, quenching and tempering.
As the plain washers of 100hv and 140hv can be made of low carbon steel according to the standard. General enterprises mostly use Baosteel materials when selecting materials, which is convenient for cold stamping. The surface can be galvanized, blackened, Dacromet, phosphatized, hot-dip galvanized, etc
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