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1.7034

40X(40KH)

This steel most often specified medium-carbon steel. It is used when greater strength and hardness is desired in the as-rolled condition. This respond to heat treatment, and flame and induction hardening, but is not recommended for carburizing treatment. When special practices is employed, weldability is fair. Die forging and hot upsetting of this grade is good to excellent.

Standard Designation	Grade, Class, Type, Symbol or Name	Steel	UNS Number	Product Form/Heat Treatment	Thickness	Yield Strength, min	Tensile Strength, min	Elongation, min, %	Other
		Number
					t, mm	N/mm² or MPa	N/mm² or MPa
EN 10250-2:1999	C45	1.0503	—	N or NT	≤ 100	305	580	16	—
					100 < t ≤ 250	275	560	16	18 J at 23°C
					250 < t ≤ 500	240	540	16	15 J at 23°C
					500 < t ≤ 1000	230	530	15	12 J at 23°C

Composition:

%C	%Si	%Mn	%P	%S	%Cr	%Mo	%Ni	other
0,42-0,50	≤0,40	0,50-0,80	0,035	0,035	≤0,40	0,10	≤0,40	Cr+Mo+Ni ≤ 0,63

Hot working:

Forging temperature range: 1230-850℃

Note: Heat to 1250 ℃. Do not forge below 850.

Heat treatment:

Soft annealing ℃	HB 30-soft annealed	Normalizing ℃	Hardening temperature for quenching in Water ℃	Hardening temperature for quenching in Oil ℃	Tempering temperature ℃
650-700	207	840-870	820-850	830-860	540-680

Main application:

Parts for crushing machines

Shape of product:

Round, flat, step shape, ring, disc, shaft, other shape depend on customer needs