Aarti Steels Limited - carbon steels, alloy steels and special steels

Spring Steel wires are used for manufacturing tension and compression coil springs which are subjected to static or low-to-high dynamic stresses and even for Impact loaded springs e.g. Motorcycle Shockers, Car Seats etc. Aarti Steels Limited is in a position to manufacture spring wire from 0.34 mm to 10 mm in diameter. The present manufacturing capacity of such wires is 5,000 METRIC TONES PER YEAR.
The basic properties of spring steel wire are given hereunder :

Chemical Composition :

Grade	Carbon %	Silicon %	Manganese %	Sulphur %	Phosphorus %
1.	0.50-0.60	0.10-0.35	0.50-0.80	0.05 max	0.05 max
2.	0.60-0.75	0.10-0.35	0.50-0.80	0.05 max	0.05 max
3.	0.65-0.80	0.10-0.35	0.60-0.90	0.05 max	0.05 max

Sizes and Size Tolerance:

Dia Range (in mm)	Size tolerance (in mm)
Dia Range (in mm)	Gr.I	Gr.II	Gr.III
0.34-0.80	+0.02	+0.015	+0.010
0.80-1.40	+0.03	+0.020	+0.010
1.50-1.95	+0.04	+0.030	+0.020
2.00-3.30	+0.05	+0.035	+0.025
3.35-5.90	+0.06	+0.040	+0.030
6.00-10.00	+0.07	+0.045	+0.035

Tensile Strength :

Dia Range (in mm)	Tensile Strength (in N/mm2)
Dia Range (in mm)	Gr.I	Gr.II	Gr.III
0.34	1710	2050	2450
0.36	1700	2040	2440
0.38	1700	2040	2430
0.40	1700	2040	2430
0.43	1690	2030	2420
0.45	1680	2020	2410
0.48	1680	2020	2400
0.50	1680	2010	2390
0.53	1670	2000	2380
0.56	1660	2000	2370
0.60	1650	1990	2360
0.63	1640	1980	2340
0.65	1640	1980	2330
0.70	1630	1970	2320
0.75	1620	1960	2300
0.80	1610	1950	2280
0.85	1600	1930	2260
0.90	1590	1920	2250
0.95	1580	1910	2250
1.00	1570	1900	2240
1.05	1560	1890	2210
1.10	1550	1880	2190
1.20	1540	1860	2170
1.25	1530	1850	2140
1.30	1520	1840	2130
1.40	1500	1820	2110
1.50	1490	1800	2100
1.60	1470	1780	2080
1.70	1460	1760	2050
1.80	1440	1750	2030
1.90	1430	1730	2010
2.00	1420	1720	1990
2.10	1410	1700	1960
2.25	1400	1680	1940
2.40	1380	1660	1910
2.50	1370	1640	1890
2.60	1360	1620	1860
2.80	1340	1600	1840
3.00	1320	1570	1830
3.20	1310	1550	1790
3.40	1290	1530	1760
3.60	1270	1510	1750
3.80	1260	1490	1720
4.00	1250	1480	1700
4.25	1250	1460	1680
4.50	1230	1440	1660
4.75	1210	1420	1620
5.00	1190	1390	1600
5.30	1170	1370	1570
5.60	1150	1350	1550
6.00	1130	1320	1530
6.30	1120	1310	1500
6.50	1110	1290	1480
7.00	1090	1260	1460
7.50	1070	1250	1430
8.00	1050	1220	1400
8.50	1020	1200	1370
9.00	1000	1180	1350
9.50	990	1150	1310
10.00	980	1130	1290

Note : 1 M Pa = 1 MM2 = 1 MN/M2 = 0.102 kgf/mm2

Reduction in Area/Torsion :

Dia (in mm)	% Reduction in Area	Minimum Torsion No. on L = 100 x dia in mm or 500 mm max.
0.34-0.49	-	-
0.50-1.00	-	25
1.05-3.00	40	22
3.05-3.90	40	20
4.00	35	20
4.10-5.25	35	18
5.30-6.90	35	18
7.00-8.40	30	9
8.50-10.00	30	6

Wrapping Test : This test is applicable to wires of 0.50 mm or lesser diameter. Approx 500 mm long wire is tightly wound closely on an arbor equal to 3 times the diameter of the wire and then stretched to 5 times the original length of the coiled spring before being released. The test spiral shall show a uniform pitch.

Coil dimension/Coil weight :

Wire dia (in mm )	Coil Dimensions (in mm)		Approx. Coil weight (kgs.)
Wire dia (in mm )	I.D. (mm)	O.D. (max.)	Approx. Coil weight (kgs.)
0.34 to 0.74	175	360	3 to 10
0.75 to 1.35	170	400	10 to 50
1.40 to 2.80	550	700	100 to 180
2.85 to 6.50	700	900	100 to 200
6.60 to 10.00	700	900	100 to 200

Packing : Coils are coated with Rust-preventive chemical & packed in polythene & Hessian.