High quality carbon structural steel

Name	Brand	Specifications	Executive standard	Chemical composition analysis (melting composition)%					Performance characteristics	Purpose
Name	Brand	Specifications	Executive standard	C	Si	Mn	P ≤	S ≤	Performance characteristics	Purpose
High quality carbon structural steel	20	Φ18~130	GB/T 699	0.17-0.23	0.17-0.37	0.35-0.65	0.035	0.035	It has enough shaping and toughness, and its performance is higher than the relevant requirements of national standards	Small carburized parts such as small shaft, small module gear and piston pin
	45	Φ18~130		0.42-0.50	0.17-0.37	0.50-0.80	0.035	0.035	The comprehensive mechanical properties are good, and the properties are higher than the relevant requirements of national standards	Small section, medium load modulators, such as spindle, crankshaft, gear, connecting rod, sprocket, etc
	55	Φ18~65		0.52-0.60	0.17-0.37	0.50-0.80	0.035	0.035	High strength, hardness and performance are higher than the relevant requirements of national standards	t is used to make connecting rod, roller, gear, flat spring, wheel rim, rim, etc. and also as casting

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