30, 35 high-quality carbon structural steel - Alloy structural steel

Chemical composition:

Trademark	Chemical composition
	C	Si	Mn	P	S	Ni	Cr	Cu
	C	Si	Mn	≤
30	0.27～0.34	0.17～0.37	0.50～0.80	0.035	0.035	0.30	0.25	0.25
35	0.32～0.39	0.17～0.37	0.50～0.80	0.035	0.035	0.30	0.25	0.25

Mechanical properties:

Trademark	The sample blank Size / mm	Heat treatment process			Mechanical properties					Delivery status hardness of steel / HBS
		Normalizing	Quench	Tempering	σ_b/MPa	σ_s/MPa	δ₅(％)	ψ(％)	A_k/J	≤
		Normalizing	Quench	Tempering	≥					Without heat treatment	Annealed steel
30	25	880	860	600	490	295	21	50	63	179
35	25	870	850	600	530	315	20	45	55	197

Characteristics and Uses:
30: for hot forging and hot stamping machine parts, cold drawn, heavy and general machinery of the shaft, rod, rings, castings and machinery used, such as cylinder, turbine racks, rolling racks and machine parts, machine frame and flywheel.
35: for the production of hot forging and hot stamping machine parts, cold drawing and cold forging steel, seamless steel pipe, machinery manufacturing parts, castings, heavy and medium machine building in the forging crankshaft, compressor cylinders, deceleration shaft, the body can also be used to cast turbine, flywheel and equalizer.