OIL HARDENED AND TEMPERED SPRING STEEL WIRE

OIL HARDENED AND TEMPERED SPRING STEEL WIRE

FDC, FDSiCr, FDSiCrV: Suitable for static applications.

TDSiCr, TDSiCrV: Spring Steel wire for medium fatigue levels, such as required for some clutch springs from unalloyed or alloyed steel.

VDSiCr, VDSiCrV: Spring Steel wire from alloyed steel for use under severe dynamic duty such as for valve springs or other springs.

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Chemical Composition
Equivalents
Mechanical properties
Surface
Tolerances

CHEMICAL COMPOSITION, % BY MASS EN 10270-2

Grade	C	Si	Mn¹	P max.	S max.	Cu max.	Cr	V
VDC	0,60-0,75	0,15-0,30	0,50-1,00	0,020	0,020	0,06	-²	-
VDCrV	0,62-0,72	0,15-0,30	0,50-0,90	0,025	0,020	0,06	0,40-0,60	0,15-0,25
VDSiCr	0,50-0,60	1,20-1,60	0,50-0,90	0,025	0,020	0,06	0,50-0,80	-
VDSiCrV	0,50-0,70	1,20-1,65	0,40-0,90	0,020	0,020	0,06	0,50-1,00	0,10-0,25³
TDC	0,60-0,75	0,10-0,35	0,50-1,20	0,020	0,020	0,10	-²	-
TDCrV	0,62-0,72	0,15-0,30	0,50-0,90	0,025	0,020	0,10	0,40-0,60	0,15-0,25
TDSiCr	0,50-0,60	1,20-1,60	0,50-0,90	0,025	0,020	0,10	0,50-0,80	-
TDSiCrV	0,50-0,70	1,20-1,65	0,40-0,90	0,020	0,020	0,10	0,50-1,00	0,10-0,25³
FDC	0,60-0,75	0,10-0,35	0,50-1,20	0,030	0,025	0,12	-²	-
FDCrV	0,62-0,72	0,15-0,30	0,50-0,90	0,030	0,025	0,12	0,40-0,60	0,15-0,25
FDSiCr	0,50-0,60	1,20-1,60	0,50-0,90	0,030	0,025	0,12	0,50-0,80	-
FDSiCrV	0,50-0,70	1,20-1,65	0,40-0,90	0,030	0,025	0,12	0,50-1,00	0,10-0,25
1. Manganese may be ordered with restricted range, but with a minimum range of 0,20 %; 2. For heavy wire diameter (above 8.5 mm) chromium may be added up to 0.30 % for proper through hardening; 3. For medium and high fatigue grades the range of vanadium content can be limited to 0,05 % to 0,15 %.

APPROXIMATE EQUIVALENT

Grades	European Standard EN	US ASTM	JAPAN JIS	CHINA GB/T 18983
FDC	EN-10270-2	A 229	G3560 SWO-A/B	FDC
FDSiCr	EN-10270-2	A 401	G3560 SWOSC-B	FDCrSi
FDSiCrV	EN-10270-2	-	-	-
TDSiCr	EN-10270-2	A 401	-	TDCrSi
TDSiCrV	EN-10270-2	-	-	-
VDSiCr	EN-10270-2	A877	G3561 SWOSC-V	VDCrSi
VDSiCrV	EN-10270-2	-	-	VDCrSiV

SPRING WIRE GRADES EN10270-2

Tensile Strength	Static	Medium fatigue	High fatique
Low tensile strength	FDC	TDC	VDC
Medium tensile strength	FDCrV	TDCrV	VDCrV
High tensile strength	FDSiCr	TDSiCr	VDSiCr
Very high tensile strength	FDSiCrV	TDSiCrV	VDSiCrV

MECHANICAL AND TECHNOLOGICAL PROPERTIES AND QUALITY REQUIREMENTS FOR WIRE GRADES

Tensile Strength R_m

Nominal Diameter mm	FDC MPa	FDCrV MPa	FDSiCr MPa	FDSiCrV MPa	TDC VDC MPa	TDCrV VDCrV MPa	TDSiCr VDSiCr MPa	TDSiCrV VDSiCrV MPa
d=0,50	1900-2100	2000-2200	2100-2300	2280-2430	1850-2000	1910-2060	2080-2230	2230-2380
0,50<d≤0,60	1900-2100	2000-2200	2100-2300	2280-2430	1850-2000	1910-2060	2080-2230	2230-2380
0,60<d≤0,80	1900-2100	2000-2200	2100-2300	2280-2430	1850-2000	1910-2060	2080-2230	2230-2380
0,80<d≤1,00	1860-2060	1960-2160	2100-2300	2280-2430	1850-1950	1910-2060	2080-2230	2230-2380
1,00<d≤1,30	1810-2010	1900-2100	2070-2260	2280-2430	1750-1850	1860-2010	2080-2230	2230-2380
1,30<d≤1,40	1790-1970	1870-2070	2060-2250	2260-2410	1700-1800	1820-1970	2060-2210	2210-2360
1,40<d≤1,60	1760-1940	1840-2030	2040-2220	2260-2410	1700-1800	1820-1970	2060-2210	2210-2360
1,60<d≤2,00	1720-1890	1790-1970	2000-2180	2210-2360	1670-1770	1770-1920	2010-2160	2160-2310
2,00<d≤2,50	1670-1820	1750-1900	1970-2140	2160-2310	1630-1730	1720-1860	1960-2060	2100-2250
2,50<d≤2,70	1640-1790	1720-1870	1950-2120	2110-2260	1600-1700	1670-1810	1910-2010	2060-2210
2,70<d≤3,00	1620-1770	1700-1850	1930-2100	2110-2260	1600-1700	1670-1810	1910-2010	2060-2210
3,00<d≤3,20	1600-1750	1680-1830	1910-2080	2110-2260	1570-1670	1670-1770	1910-2010	2060-2210
3,20<d≤3,50	1580-1730	1660-1810	1900-2060	2110-2260	1570-1670	1670-1770	1910-2010	2010-2160
3,50<d≤4,00	1550-1700	1620-1770	1870-2030	2060-2210	1550-1650	1620-1720	1860-1960	2010-2160
4,00<d≤4,20	1540-1690	1610-1760	1860-2020	2060-2210	1550-1650	1570-1670	1860-1960	1960-2110
4,20<d≤4,50	1520-1670	1590-1740	1850-2000	2060-2210	1550-1650	1570-1670	1860-1960	1960-2110
4,50<d≤4,70	1510-1660	1580-1730	1840-1990	2010-2160	1540-1640	1570-1670	1810-1910	1960-2110
4,70<d≤5,00	1500-1650	1560-1710	1830-1980	2010-2160	1540-1640	1570-1670	1810-1910	1960-2110
5,00<d≤5,60	1470-1620	1540-1690	1800-1950	2010-2160	1520-1620	1520-1620	1810-1910	1910-2060
5,60<d≤6,00	1460-1610	1520-1670	1780-1930	1960-2110	1520-1620	1520-1620	1760-1860	1910-2060
6,00<d≤6,50	1440-1590	1510-1660	1760-1910	1960-2110	1470-1570	1470-1570	1760-1860	1910-2060
6,50<d≤7,00	1430-1580	1500-1650	1740-1890	1960-2110	1470-1570	1470-1570	1710-1810	1860-2010
7,00<d≤8,00	1400-1550	1480-1630	1710-1860	1910-2050	1420-1520	1420-1520	1710-1810	1860-2010
8,00<d≤8,50	1380-1530	1470-1620	1700-1850	1890-2030	1390-1490	1390-1490	1670-1770	1810-1960
8,50<d≤9,00	1360-1510	1450-1600	1660-1810	1870-2010	1390-1490	1390-1490	1670-1770	1810-1960
9,00<d≤10,00	1360-1510	1450-1600	1660-1810	1870-2010	1390-1490	1390-1490	1670-1770	1810-1960
10,00<d≤12,00	1320-1470	1430-1580	1620-1770	1830-1970	-	-	-	-
12,00<d≤14,00	1280-1430	1420-1570	1580-1730	1790-1930	-	-	-	-
14,00<d≤15,00	1270-1420	1410-1560	1570-1720	1780-1920	-	-	-	-
15,00<d≤17,00	1250-1400	1400-1550	1550-1700	1760-1900	-	-	-	-
1. "-" Under commercial agreement; 2. For diameters>17,00mm, under commercial agreement； 3. For diameters>10mm, the tensile strength 1950MPa or above 1950MPa may be agreed between the parties.

PERMISSIBLE DEPTH OF SURFACE DEFECTS (mm)

If needed for VD grade the wire can be shaved or ground.

Wire grade	VD	TD	FD
C	0,005d	0,008d	0,010d
CrV	0,007d	0,008d	0,010d
SiCr, SiCrV	0,010d	0,013d	0,015d

PERMISSIBLE SURFACE DEFECTS BY ECT (EDDY CURRENT TEST)

Tests are not normally performed for FD-type wires.

Nominal diameter mm	Maximum depth of the defect¹
	VD	TD
2,50 ≤ d ≤ 4,99	40 µm	60 µm
4,99 ≤ d ≤ 5,99	40 µm	60 µm
5,99 ≤ d ≤ 8,00	60 µm	60 µm
8,00≤ d ≤ 17,00	60 µm	60 µm
1. Other values may be agreed at the time of enquiry and order.

PERMISSIBLE DEPTH OF SURFACE DECARBURIZATION (mm)

If needed for VD and TD grades the wire can be shaved or ground.

Wire grade	VD	TD	FD
C	0,005d	0,008d	0,010d
CrV	0,007d	0,008d	0,010d
SiCr, SiCrV	0,010d	0,013d	0,015d

DIAMETER TOLERANCES. PERMISSIBLE DEVIATIONS ACCORDING TO EN 10270-2

Nominal Size mm				Permissible Deviations mm
0,50≤ d≤ 0,80				≤ 0,010
0,80<d≤ 1,00				±0,015
1,00<d≤ 1,60				±0,020
1,60<d≤ 2,70				±0,025
2,70 <d≤ 4,00				±0,030
4,00 <d≤ 5,60				±0,035
5,60 <d≤ 7,00				±0,040
7,00 <d≤ 9,00				±0,045
9,00 <d≤ 10,00				±0,050
10,00 <d≤ 12,00				±0,070
12,00 <d≤ 15,00				±0,080
15,00 <d≤ 17,00				±0,090

Out of roundness

The difference between the maximum and the minimum diameter of the wire at the same cross section shall not be more than 50% of the total permissible deviation specified in the mechanical properties.

WORKSHOP

APPLICATION

Oil tempered spring steel wire is mainly used for producing clutch spring, valve spring, suspension springs, electric tailgate spring, compressed springs, Torsion Spring, etc.

REQUIREMENTS

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