Fe	Si	Zn	Ti	Mg	Mn	Cu	Pb	Other	Al
0,8	0,8	0,8	0,2	0,4-1,8	0,5-1,0	3,3-4,6	0,8-1,5	0,3	Remaining

Temper	Yield Strength ( MPa ) min-max	Tensile Strength ( MPa ) min-max	Elongation (% 50 ) Min - max	Hardness ( HB ) min-max
T3	360	460	-	115
T4	295	445	14	-

It has high fatigue resistance and can be heat treated to high hardness. It is not suitable for open-air environments, so hard coating and other protection methods are recommended. It is used for various machine parts, the manufacture of screws, bolts, and nuts, the defense industry, and the automotive industry.