Description

Spring Steel is typically used because of its' high yield strengths, resistance to deformation and its ability to return to its original shape.

All Grades Comparison

GB	ASTM	JIS	EN	DIN
55	1055	/	CK55	1.1204
60	1060	/	CK60	1.1211
70	1070	/	CK67	1.1231
75	1075	/	CK75	1.1248
85	1086	SUP3	CK85	1.1269
T10A	1095	SK4	CK101	1.1274
65Mn	1066	/	/	/
60Si2Mn	9260	SUP6,SUP7	61SiCr7	60SiCr7
50CrVA	6150	SUP10A	51CrV4	1.8159

Quality Standard

DIN 17222 Cold Rolled Steel Strips for Springs Technical Conditions of Delivery
BS EN 10132 Cold rolled narrow steel strip for heat treatment. Technical delivery conditions

Mechanical Properties(Quenched and Tempered Condition)(T=20°C if not differently stated)

Steel Grade	Tensile Strength Rm (Mpa)	Yield Strength Rp0.2 (Mpa)	Elongation A5 (%)	Area Reduction Ratio C (%)
65	980 min	785 min	9 min	35 min
70	1030 min	835 min	8 min	30 min
85	1130 min	980 min	6 min	30 min
65Mn	980 min	785 min	8 min	30 min
60Si2Mn	1275 min	1180 min	5 min	25 min
50CrVA	1275 min	1130 min	10 min	40 min

Delivery Conditions

Cold Rolled only
Cold Rolled+Soft Annealed (G)
Cold Rolled+Soft Annealed+Cold Rolled (G+K)
Cold Rolled+Hardened+Tempered (H+A)

Surface Conditions

Grey Blue (GR)
Bright (BK)
Polished (P)
Polished and Colour Tempered (P+AF)

Heat Treatment

Steel Grade	Quenching Temperature (°C) (	Media	Tempering Temperature (°C)
65	840	oil	500
70	830	oil	480
85	820	oil	480
65Mn	830	oil	540
60Si2Mn	870	oil	480
50CrVA	850	oil	500

Mills test certificate:

EN 10204/3.1 with all relevant data reg. chem. Composition, mech. Properties and results of testing.