Mechanical Tables - Cold Rolled Steel Strip for Spring (IS : 2507-1965)

Cold Rolled Steel Strip for Spring (IS : 2507-1965)



Designation of Steel	Grade	Tensile strength kgf/mm²		C %	Si %	Haedened in oil at ^oC	Annealed at ^oC

		Hardened and Tempered	Annealed Max.

C 45 ... ...	1	120-145	60	0.40- 0.50	0.10- 0.35	830-860	600-650
C 65 ... ...	3	120-145	60	0.60- 0.70	0.10- 0.35	810-840	600-650
C 75 ... ...	5	120-160	65	0.70- 0.80	0.10- 0.35	810-840	600-650
C 98... ...	8	160-180	70	0.90- 1.05	0.10- 0.35	770-800	620-660
55 Si 2 Mn 90 ...	9	160-200	80	0.50- 0.60	1.05- 2.00	830-860	640-680
50 Cr I ... ...	10	170-230	80	0.45- 0.55	0.10- 0.35	830-860	640-680
50 Cr IV 23	11	190-240	80	0.45- 0.55	0.10- 0.35	830-860	600-680

Typical Application : In the form of bars and flats for volute, helical and leminated spring for automotive suspension