The list of spring steel qualities is quite extensive, as most major steel producing countries have their own national standards, and this website cannot list them all. Accordingly we will give details of the American, European, UK and German standards, which are recognised in most parts of the world.

Standard Spring Steel Grades Chemistry

Carbon Steels for Heat Treatment

Euronorm

Germany

USA

EN 10132 - 4

DIN 17222

BS 1449

SAE

%Mn

%Si

%Al

%Cr

Max Hardness (annealed)

CK 50

CS50

SAE1050

.45-.55

.50-.90

.05-.35

.040 max

.045 max

C67S

CK67/C67

CS70

SAE 1070

.68 - .73

.60 - .85

.15 - .25

.01 max

.02 max

.20 - .30

200

C75S

CK75/C75

CS70

SAE 1074

.70 - .75

.60 - .80

.15 - .30

.025 max

.02 - .05

.20 - .30

200

C85S

CK85

CS80

SAE 1084

.80 - .90

.40 - .70

.15 - .35

.025 max

.40 max

210

C90S

.80-.90

0.40-0.70

.15-.35

0.25 max

.40 max

215

C100S

CK101

CS95

SAE 1095

0.90-1.00

.30-.60

.05-.35

.025 max

.40 max

220


Grade designation		Chemical composition										Mechanical properties⁄
Name	Number	C	Si	Mn	P	S	Cr	Mo	V	Ni	Delivery condition	max. Rp0.2	Rm	min. A80	HV
					max.	max.		max.				N/mm²	N/mm²	%
		0.52	0.15	0.60							Annealed (+A) or annealed and skin passed (+LC)	480	max. 600	17	max. 185
C55S	1.1204	-	-	-	0.025	0.025	0.40	0.10	-	0.40	Cold rolled (+CR)	-	max. 1070	-	max. 300
		0.60	0.35	0.90			max.			max.	Quenched and tempered (+QT)	-	1100 - 1700	-	340 - 520
		0.57	0.15	0.60							Annealed (+A) or annealed and skin passed (+LC)	495	max. 620	17	max. 195
C60S	1.1211	-	-	-	0.025	0.025	0.40	0.10	-	0.40	Cold rolled (+CR)	-	max. 1100	-	max. 305
		0.65	0.35	0.90			max.			max.	Quenched and tempered (+QT)	-	1150 - 1750	-	345 - 530
		0.65	0.15	0.60							Annealed (+A) or annealed and skin passed (+LC)	510	max. 640	16	max. 200
C67S	1.1231	-	-	-	0.025	0.025	0.40	0.10	-	0.40	Cold rolled (+CR)	-	max. 1140	-	max. 315
		0.73	0.35	0.90			max.			max.	Quenched and tempered (+QT)	-	1200 - 1900	-	370 - 580
		0.70