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Wheel is made up of the rim and the disk. The main processing technique for rim is roll forming. Punch forming and spin forming are usually applied for disc. Punch forming is mainly used for disc of passenger cars, while disc of commercial cars are usually punch-formed (wigh inner tire) or spin-formed (without inner tire)

B600QK steel chemical composition

Grade	C≤	Si	Mn	P	S	Alt	Nb
B600QK	0.16	0.5	1.5	0.03	0.035	-	-

B600QK steel mechanical properties

Grade	Yield strength (MPa)	Tensile strength (MPa)	Elongation (%)	180 degree cold bend,diameter
B600QK	≥550	≥600	≥15	3a

Remark : Test piece for tensile test taken to the rolling direction. Test piece for cold bend test taken transverse to the rolling direction.

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