Spring Steels

Conditions of Supply	Shapes	Sizes
Hot Rolled	Flat (W x T)	50 x 5 mm - 125 x 34 mm
Hot Rolled	Round	5.5 - 250 mm
Drawn	Round	5 - 50 mm
Peeled and Ground	Round	5 - 100 mm

Edge Radius

Flats can be supplied with an edge radius "R" which is equal to either "T" or "T/2", where "T" is equal to thikeness.

General Length

We cater to orders in standard and specific length.

Standard length 4 to 6 meters with 10% shorts down to 1 meter.

Customer's specific lengths with tolerance + 50/-0mm.

Straightness

Bars hot rolled 3 mm/mtr (max) & hot rolled & machine straightened 1 mm/mtr (max)

Quality

Surface Condition: ON visual inspection, surface is free from harmful defects. eg. Crack, lap, fold, scratch, roll/passmarks, pits etc

Decarburization

	Full	Partial	Total
Flats (upto 80 x 13)	Nil	0.15	0.15 mm (max)
Flats (above 80 x 13)	0.03	0.25	0.25 mm (max)
Hot Rolled Round		0.8% of the size (max)	0.8% of the size (max)

Grain Size

5.8 (As per ASTME-112)

As Rolled Hardness

310 BHN (max)

Inclusion Rating

As per IS-4163/ASTME-45	THIN: 2.5 A, B, C, D max Heavy: 1.5 A, B, C, D max
As per JIS G-0555	%dA - 0.15 max %dB + dC - 0.10max %d Tot - 0.20 max

Delivery Conditions

All bundles tied with/strapping at 3/4 places.
Approx. bundle weight: 2MT. max
Grade/HT. No. Identification :By painted colour code and Heat number writter on each bundle / bar

Dimensional Tolerances

Width Range (mm)	Tolerance (mm) (+/-)			Tolerance (mm)
	Width(W)	Thickness(T)		Concavity (+max) for
		<=10	>10	T<=10	T>10
40-50	0.30	0.15	-	0.15	0.15
51-75	0.50	0.15	0.20	0.15	0.20
76-100	0.70	0.20	0.25	0.20	0.20
101-125	0.90	0.25	0.40	0.30	0.40

Rounds (Hot Rolled)

Size (mm Dia)		Tolerance (mm)
Over	Upto & Including	Tolerance (Dia)	Tolerance (Out of Round)
-	12	+/- 0.18	0.25
12	15	+/- 0.18	0.25
15	22	+/- 0.20	0.30
22	25	+/- 0.24	0.35
25	28	+/- 0.25	0.40
28	31	+/- 0.28	0.45
31	34	+/- 0.30	0.50
34	38	+/- 0.36	0.60
38	50	+/- 0.40	0.60
50	64	+0.8 / -0	0.80
64	80	+1.20 / -0	0.80
80	89	+1.20 / -0	0.80
89	100	+1.60 / -0	1.20

Rounds (Bright Bars)

Size (mm Dia)		Tolerance on Dia (mm)
Over	Upto & Including	Cold Drawn	Peeled / Turned	Centreless Ground
-	10	+0 / -0.09	-	+0 / -0.036
10	18	+0 / -0.11	+0 / -0.11	+0 / -0.043
18	30	+0 / -0.013	+0 / -0.013	+0 / -0.052
30	50	+0 / -0.16	+0 / -0.16	+0 / -.0.62

Fatigue Guaranteed Spring Steels

KJ Steels, a pioneer in making Spring Steel, has come up with products in this category , which ensure the required fatigue life to springs used in vehicles, in the most demanding situations.

The salient features of these products are:

Use of virgin inputs in steel making such as DRI, Pig Iron which are free from undesirable tramp elements

Carefully planned, steel making refining vacuum degassing and casting processes.

Well controlled reheating and rolling process.

Closely monitored cooling parameters of rolled products

Thorough inspection and testing.

Proper packing, stacking and storage for dispatch

Wide size range

Grade	Chemistry
	c	Mn	p	s	Si	Cu	Cr	Ni	Mo	V	Al	B	Nb
50CrV4	0.47-0.55	0.70-1.10	0.035 Max	0.035 Max	0.15-0.40	0.25 Max	0.90-1.20	-	-	0.10-0.20	0.040 Max	-	-
51CrMoV4	0.48-0.55	0.70-1.10	0.030 Max	0.030 Max	0.15-0.40	0.25 Max	0.90-1.20	-	0.15-0.25	0.07-0.12	0.040 Max	-	-
51Crv4	0.48-0.55	0.85-1.10	0.020 Max	0.020 Max	0.25-0.40	0.25 Max	0.95-1.20	0.20 Max	0.06 Max	0.10-0.20	0.015-0.040	-	-
51CrV4-Nb	0.50-0.55	0.90-1.10	0.015 Max	0.015 Max	0.15-0.40	0.25 Max	0.95-1.20	0.40 Max	0.06 Max	0.07-0.14	0.015-0.025	-	0.0600
5Cr4Mo2V	0.48-0.56	0.70-1.10	0.025 Max	0.025 Max	0.15-0.40	-	0.90-1.20	-	0.15-0.25	0.07-0.12	-	-	-
52CrMoV4	0.48-0.56	0.70-1.10	0.015 Max	0.015 Max	0.15-0.40	-	0.90-1.20	-	0.15-0.25	0.07-0.12	-	-	-
55Cr3	0.50-0.60	0.60-0.80	0.035 Max	0.035 Max	0.10-0.35	0.25 Max	0.60-0.80	-	-	-	0.040 Max	-	-
55si7	0.50-0.60	0.80-1.00	0.025 Max	0.025 Max	1.50-2.00	0.25 Max	0.25 Max	-	-	-	-	-	-
60Si7	0.55-0.65	0.80-1.00	0.025 Max	0.025 Max	1.50-2.00	0.25 Max	0.25 Max	-	-	-	-	-	-
60SiCr7	0.55-0.65	0.70-1.00	0.045 Max	0.045 Max	1.50-1.80	0.25 Max	0.20-0.40	-	-	-	0.40 Max	-	-
65Si7	0.60-0.70	080-1.00	0.025 Max	0.025 Max	1.50-2.00	-	0.25 max	-	-	-	-	-	-
54SiCr6	0.50-0.59	0.50-0.80	0.03 Max	0.030 Max	1.20-1.60	-	0.50-0.80	-	-	-	-	-	0.1000
BS
EN45A	0.55-0.65	0.70-1.00	0.050 Max	0.050 Max	1.70-2.00		0.25 Max	-	-	-	-	-	-
ASTIM						0.25 Max				-	0.40 Max	-	-
SAE5160	0.56-0.64	0.75-1.00	0.035 Max	0.040 Max	0.15-0.30	-	0.70-0.90	-	-	-		-	-
SAE5160H	0.55-0.65	0.65-110	0.035 Max	0.035 Max	0.15-0.30	0.25 Max	0.60-1.00	-	-	-	0.040 Max	-	-
SAE51B60H	0.55-0.65	0.65-1.10	0.035 Max	0.040 Max	0.15-0.30	0.25 Max	0.60-1.00	-	-	-	0.040 Max	0.0005 Min	-
SAE9254	0.51-0.59	0.60-0.80	0.035 Max	0.040 Max	1.20-1.60	0.25 Max	0.60-0.80	-	-	-	0.040 Max	-	-
SAE9261(M)	0.55-0.65	0.70-1.00	0.050 Max	0.050 Max	1.80-2.20	0.25 Max	0.10-0.25	0.35 Max	0.10 Max	-	0.40 Max	-	-
JIS						0.35 Max			-	0.10 Max	-
SUP6	0.56-0.64	0.70-1.00	0.35 Max	0.35 Max	1.50-1.80	0.25 Max	0.25 Max	-	-	-	0.040 Max	-	-
SUP7	0.55-0.65	0.70-.10	0.35 Max	0.35 Max	1.80-2.20	0.25 Max	0.25 Max	-	-	-	0.040 Max	-	-
SUP7C	0.58-0.64	0.80-1.00	0.30 Max	0.30 Max	1.90-2.20	0.25 Max	0.10-0.20	-	-	-	0.040 Max	-	-
SUP7N	0.65-0.63	0.80-1.00	0.35 Max	0.35 Max	1.90-2.20	-	0.10-0.20	-	-	-	0.040 Max	-	-
SUP9	0.52-0.60	0.65-0.95	0.35 Max	0.35 Max	0.15-0.35	0.15 Max	0.65-0.95	-	-	-	-	-	-
SUP9A	0.56-0.64	0.65-0.95	0.35 Max	0.35 Max	0.15-0.35	0.25 Max	0.70-1.00	-	-	-	-	-	-
SUP8H	0.52-0.60	0.65-0.95	0.35 Max	0.35 Max	0.15-0.35	0.25 Max	0.65-0.95	-	-	-	0.040 Max	-	-
SUP9M	0.55-0.60	0.75-0.90	0.30 Max	0.30 Max	0.15-0.35	0.30 Max	0.70-0.90	-	-	-	0.040 Max	-	-
SUP9N	0.56-0.60	0.80-1.00	0.30 Max	0.30 Max	0.15-0.35	0.25 Max	0.80-1.00	-	-	-	0.020 Max	-	--
SUP11A	0.56-0.64	0.70-1.00	0.35 Max	0.35 Max	0.15-0.35		0.70-1.00	-	-	-		0.0005 Min	-
SUP12	0.51-0.59	0.60-0.90	0.30 Max	0.30 Max	1.20-1.60	0.25 Max	0.60-0.90	-	-	-	0.040 Min	-	-