Patented cold drawn unalloyed spring steel wire

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Patented cold drawnunalloyed spring steel wire

SM: Tension, compression or torsion springs which are subjected to medium high static stresses or rarely to dynamic stresses.

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Chemical Composition

CHEMICAL COMPOSITION, % BY MASS EN 10270-1

Grade	C1	Si	Mn2, 3	Pmax.	Smax.	Cumax.
SL	0,35-1,00	0,10-0,30	0,40-1,20	0,035	0,035	0,20
SM	0,35-1,00	0,10-0,30	0,40-1,20	0,035	0,035	0,20
SH	0,35-1,00	0,10-0,30	0,40-1,20	0,035	0,035	0,20
DM	0,45-1,00	0,10-0,30	0,40-1,20	0,020	0,025	0,12
DH	0,45-1,00	0,10-0,30	0,40-1,20	0,020	0,025	0,12
1. Such a wide range is stipulated to accommodate the whole range of sizes. For individual sizes the carbon range is substantially more restricted; 2. The range of manganese content in the table is wide to cope with various processing situations and the broad size range. The actual figures per size shall be more restrited; 3. For the manganese content, a different range from the one indicated in the table may be agreed at the time of ordering, with a maximum not exceeding 1,20% and with a minimum range of 0,20%.

Equivalents

APPROXIMATE EQUIVALENTS

Grades	European Standard	DIN	US ASTM	JAPAN JIS G-3506/G3522	CHINA GB/T 4357
SL	EN 10270-1	KLASSE A	A 227	SWB	SL
SM	EN 10270-1	KLASSE B	A 227	SWC	SM
SH	EN 10270-1	KLASSE C	A 228	SWP-B	SH
DM	EN 10270-1	-	A 227	-	-
DH	EN 10270-1	KLASSE D	A 228	SWP-B	DH

Mechanical Properties

SPRING WIRE GRADES EN 10270-1

Tensile Strength¹	Static	Dynamic
Low	SL	-
Medium	SM	DM
High	SH	DH
1. For other tensile strength may be agreed.

MECHANICAL PROPERTIES AND QUALITY REQUIREMENTS FOR WIRE GRADES EN 10270-1

Tensile Strength R_m

Nominal Diameter mm	SL MPa	SM MPa	DM MPa	SH MPa	DH MPa	Minimum area reduction after Z break %
d=0,2	-	-	-	-	2800 - 3110	-
0,20 < d ≤ 0,22	-	-	-	-	2770 - 3080	-
0,22 < d ≤ 0,25	-	-	-	-	2720 - 3010	-
0,25 < d ≤ 0,28	-	-	-	-	2680 - 2970	-
0,28 < d ≤ 0,30	-	2370 - 2650	2370 - 2650	2660 - 2940	2660 - 2940	-
0,30 < d ≤ 0,32	-	2350 - 2630	2350 - 2630	2640 - 2920	2640 - 2920	-
0,32 < d ≤ 0,34	-	2330 - 2600	2330 - 2600	2610 - 2890	2610 - 2890	-
0,34 < d ≤ 0,36	-	2310 - 2580	2310 - 2580	2590 - 2870	2590 - 2870	-
0,36 < d ≤ 0,38	-	2290 - 2560	2290 - 2560	2570 - 2850	2570 - 2850	-
0,38 < d ≤ 0,40	-	2270 - 2550	2270 - 2550	2560 - 2830	2560 - 2830	-
0,40 < d ≤ 0,43	-	2250 - 2520	2250 - 2520	2530 - 2800	2530 - 2800	-
0,43 < d ≤ 0,45	-	2240 - 2500	2240 - 2500	2510 - 2780	2510 - 2780	-
0,45 < d ≤ 0,48	-	2220 - 2480	2220 - 2480	2490 - 2760	2490 - 2760	-
0,48 < d ≤ 0,50	-	2200 - 2470	2200 - 2470	2480 - 2740	2480 - 2740	-
0,50 < d ≤ 0,53	-	2180 - 2450	2180 - 2450	2460 - 2720	2460 - 2720	-
0,53 < d ≤ 0,56	-	2170 - 2430	2170 - 2430	2440 - 2700	2440 - 2700	-
0,56 < d ≤ 0,60	-	2140 - 2400	2140 - 2400	2410 - 2670	2410 - 2670	-
0,60 < d ≤ 0,63	-	2130 - 2380	2130 - 2380	2390 - 2650	2390 - 2650	-
0,63 < d ≤ 0,65	-	2120 - 2370	2120 - 2370	2380 - 2640	2380 - 2640	-
0,65 < d ≤ 0,70	-	2090 - 2350	2090 - 2350	2360 - 2610	2360 - 2610	-
0,70 < d ≤ 0,75	-	2070 - 2320	2070 - 2320	2330 - 2580	2330 - 2580	-
0,75 < d ≤ 0,80	-	2050 - 2300	2050 - 2300	2310 - 2560	2310 - 2560	40
0,80 < d ≤ 0,85	-	2030 - 2280	2030 - 2280	2290 - 2530	2290 - 2530	40
0,85 < d ≤ 0,90	-	2010 - 2260	2010 - 2260	2270 - 2510	2270 - 2510	40
0,90 < d ≤ 0,95	-	2000 - 2240	2000 - 2240	2250 - 2490	2250 - 2490	40
0,95 < d ≤ 1,00	1720 - 1970	1980 - 2220	1980 - 2220	2230 - 2470	2230 - 2470	40
1,00 < d ≤ 1,05	1710 - 1950	1960 - 2200	1960 - 2200	2210 - 2450	2210 - 2450	40
1,05 < d ≤ 1,10	1690 - 1940	1950 - 2190	1950 - 2190	2200 - 2430	2200 - 2430	40
1,10 < d ≤ 1,20	1670 - 1910	1920 - 2160	1920 - 2160	2170 - 2400	2170 - 2400	40
1,20 < d ≤ 1,25	1660 - 1900	1910 - 2140	1910 - 2140	2150 - 2380	2150 - 2380	40
1,25 < d ≤ 1,30	1640 - 1890	1900 - 2130	1900 - 2130	2140 - 2370	2140 - 2370	40
1,30 < d ≤ 1,40	1620 - 1860	1870 - 2100	1870 - 2100	2110 - 2340	2110 - 2340	40
1,40 < d ≤ 1,50	1600 - 1840	1850 - 2080	1850 - 2080	2090 - 2310	2090 - 2310	40
1,50 < d ≤ 1,60	1590 - 1820	1830 - 2050	1830 - 2050	2060 - 2290	2060 - 2290	40
1,60 < d ≤ 1,70	1570 - 1800	1810 - 2030	1810 - 2030	2040 - 2260	2040 - 2260	40
1,70 < d ≤ 1,80	1550 - 1780	1790 - 2010	1790 - 2010	2020 - 2240	2020 - 2240	40
1,80 < d ≤ 1,90	1540 - 1760	1770 - 1990	1770 - 1990	2000 - 2220	2000 - 2220	40
1,90 < d ≤ 2,00	1520 - 1750	1760 - 1970	1760 - 1970	1980 - 2200	1980 - 2200	40
2,00 < d ≤ 2,10	1510 - 1730	1740 - 1960	1740 - 1960	1970 - 2180	1970 - 2180	40
2,10 < d ≤ 2,25	1490 - 1710	1720 - 1930	1720 - 1930	1940 - 2150	1940 - 2150	40
2,25 < d ≤ 2,40	1470 - 1690	1700 - 1910	1700 - 1910	1920 - 2130	1920 - 2130	40
2,40 < d ≤ 2,50	1460 - 1680	1690 - 1890	1690 - 1890	1900 - 2110	1900 - 2110	40
2,50 < d ≤ 2,60	1450 - 1660	1670 - 1880	1670 - 1880	1890 - 2100	1890 - 2100	40
2,60 < d ≤ 2,80	1420 - 1640	1650 - 1850	1650 - 1850	1860 - 2070	1860 - 2070	40
2,80 < d ≤ 3,00	1410 - 1620	1630 - 1830	1630 - 1830	1840 - 2040	1840 - 2040	40
3,00 < d ≤ 3,20	1390 - 1600	1610 - 1810	1610 - 1810	1820 - 2020	1820 - 2020	40
3,20 < d ≤ 3,40	1370 - 1580	1590 - 1780	1590 - 1780	1790 - 1990	1790 - 1990	40
3,40 < d ≤ 3,60	1350 - 1560	1570 - 1760	1570 - 1760	1770 - 1970	1770 - 1970	40
3,60 < d ≤ 3,80	1340 - 1540	1550 - 1740	1550 - 1740	1750 - 1950	1750 - 1950	40
3,80 < d ≤ 4,00	1320 - 1520	1530 - 1730	1530 - 1730	1740 - 1930	1740 - 1930	35
4,00 < d ≤ 4,25	1310 - 1500	1510 - 1700	1510 - 1700	1710 - 1900	1710 - 1900	35
4,25 < d ≤ 4,50	1290 - 1490	1500 - 1680	1500 - 1680	1690 - 1880	1690 - 1880	35
4,50 < d ≤ 4,75	1270 - 1470	1480 - 1670	1480 - 1670	1680 - 1860	1680 - 1860	35
4,75 < d ≤ 5,00	1260 - 1450	1460 - 1650	1460 - 1650	1660 - 1840	1660 - 1840	35
5,00 < d ≤ 5,30	1240 - 1430	1440 - 1630	1440 - 1630	1640 - 1820	1640 - 1820	35
5,30 < d ≤ 5,60	1230 - 1420	1430 - 1610	1430 - 1610	1620 - 1800	1620 - 1800	35
5,60 < d ≤ 6,00	1210 - 1390	1400 - 1580	1400 - 1580	1590 - 1770	1590 - 1770	35
6,00 < d ≤ 6,30	1190 - 1380	1390 - 1560	1390 - 1560	1570 - 1750	1570 - 1750	35
6,30 < d ≤ 6,50	1180 - 1370	1380 - 1550	1380 - 1550	1560 - 1740	1560 - 1740	35
6,50 < d ≤ 7,00	1160 - 1340	1350 - 1530	1350 - 1530	1540 - 1710	1540 - 1710	35
7,00 < d ≤ 7,50	1140 - 1320	1330 - 1500	1330 - 1500	1510 - 1680	1510 - 1680	30
7,50 < d ≤ 8,00	1120 - 1300	1310 - 1480	1310 - 1480	1490 - 1660	1490 - 1660	30
8,00 < d ≤ 8,50	1110 - 1280	1290 - 1460	1290 - 1460	1470 - 1630	1470 - 1630	30
8,50 < d ≤ 9,00	1090 - 1260	1270 - 1440	1270 - 1440	1450 - 1610	1450 - 1610	30
9,00 < d ≤ 9,50	1070 - 1250	1260 - 1420	1260 - 1420	1430 - 1590	1430 - 1590	30
9,50 < d ≤ 10,00	1060 - 1230	1240 - 1400	1240 - 1400	1410 - 1570	1410 - 1570	30
10,00 < d ≤ 10,50	-	1220 - 1380	1220 - 1380	1390 - 1550	1390 - 1550	30
10,50 < d ≤ 11,00	-	1210 - 1370	1210 - 1370	1380 - 1530	1380 - 1530	30
11,00 < d ≤ 12,00	-	1180 - 1340	1180 - 1340	1350 - 1500	1350 - 1500	30
12,00 < d ≤ 12,50	-	1170 - 1320	1170 - 1320	1330 - 1480	1330 - 1480	28
12,50 < d ≤ 13,00	-	1160 - 1310	1160 - 1310	1320 - 1470	1320 - 1470	28
13,00 < d ≤ 14,00	-	1130 - 1280	1130 - 1280	1290 - 1440	1290 - 1440	28
14,00 < d ≤ 15,00	-	1160 - 1260	1160 - 1260	1270 - 1410	1270 - 1410	28
15,00 < d ≤ 16,00	-	1090 - 1230	1090 - 1230	1240 - 1390	1240 - 1390	28
16,00 < d ≤ 17,00	-	1070 - 1210	1070 - 1210	1220 - 1360	1220 - 1360	28
17,00 < d ≤ 18,00	-	1050 - 1190	1050 - 1190	1200 - 1340	1200 - 1340	28
18,00 < d ≤ 19,00	-	1030 - 1170	1030 - 1170	1180 - 1320	1180 - 1320	28
19,00 < d ≤ 20,00	-	1020 - 1150	1020 - 1150	1160 - 1300	1160 - 1300	28
Wire with a size above 20mm diameter is used. Where such wire is specified the parties shall agree upon the properties and requirements at the time of enquiry and order.

PERMISSIBLE TENSILE STRENGTH RANGE WITHIN A SINGLE UNIT PACKAGE IN MPa

Nominal Diameter mm	SL, SM, SH	DM, DH
d＜0,80	150	150
0,80≤d＜1,60	120	100
1,60≤d	120	70
The requirements apply unit packages the mass of which in kilograms does not exceed the value of 250×d (d = wire diameter in mm) or a value of 1000 kg; In the case of coils greater mass, appropriate agreements shall be made.

Surface

MINIMUM REQUIRED ZINC COATING MASS EN 10270-1

Nominal Diameter mm				Minimum Coating Mass¹ g/m²
0,20 ≤ d < 0,25				20
0,25 ≤ d < 0,40				25
0,40 ≤ d < 0,50				30
0,50 ≤ d < 0,60				35
0,60 ≤ d < 0,70				40
0,70 ≤ d < 0,80				45
0,80 ≤ d < 0,90				50
0,90 ≤ d < 1,00				55
1,00 ≤ d < 1,20				60
1,20 ≤ d < 1,40				65
1,40 ≤ d < 1,65				70
1,65 ≤ d < 1,85				75
1,85 ≤ d < 2,15				80
2,15 ≤ d < 2,50				85
2,50 ≤ d < 2,80				95
2,80 ≤ d < 3,20				100
3,20 ≤ d < 3,80				105
3,80 ≤ d ≤ 10,00				110
1. The requirement for the zinc coating correspond to class C of EN 10244-2:2009;

Tolerances

DIAMETER TOLERANCES. PERMISSIBLE DEVIATIONS ACCORDING TO EN 10270-1

Nominal Size mm				Permissible Deviations mm
0,20≤ d ≤ 0,25				±0,005
0,25 < d ≤ 0,63				±0,008
0,63 < d ≤ 0,75				±0,010
0,75 < d ≤ 1,00				±0,015
1,00 < d ≤ 1,20				±0,020
1,20 < d ≤ 1,70				±0,020
1,70 < d ≤ 2,60				±0,025
2,60 < d ≤ 4,00				±0,030
4,00 < d ≤ 5,30				±0,035
5,30 < d ≤ 7,00				±0,040
7,00 < d ≤ 9,00				±0,045
9,00 < d ≤ 10,00				±0,050
10,00 < d ≤ 11,00				±0,070
11,00 < d ≤ 14,00				±0,080
14,00 < d ≤ 18,00				±0,090
18,00 < d ≤ 20,00				±0,100

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 table.

Key words:

Patented cold drawn unalloyed spring steel wire

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