OIL HARDENED AND TEMPERED SPRING STEEL WIRE
OIL HARDENED AND TEMPERED SPRING STEEL WIRE
OIL HARDENED AND TEMPERED SPRING STEEL WIRE
OIL HARDENED AND TEMPERED SPRING STEEL WIRE
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.
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 Rm

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.

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