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HRC	HRB	VPN(HV)	Ultimate Kg/mm sq	Tensile Strength n/mm sq
60	-	697	-	-
59	-	674	229.2	2335.55
58	-	653	221.46	2256.68
57	-	633	214.43	2185.04
56	-	613	207.41	2113.51
55	-	595	201.78	2058.5
54	-	577	195.46	1993.6
53	-	560	189.13	1927.3
52	-	544	184.21	1879.9
51	-	528	177.80	1814.9
50	-	513	172.25	1756.9
49	-	498	168.04	1714.0
48	-	484	163.11	1663.7
47	-	471	158.19	1613.5
46	-	458	153.97	1570.4
45	-	446	149.05	1520.2
44	-	434	144.83	1477.2
43	-	423	141.33	1441.5
42	-	412	137.79	1405.4
41	-	402	134.28	1369.6
40	-	392	130.78	1339.9
39	-	382	127.24	1297.8
38	-	372	123.73	1262.0
37	-	363	120.82	1233.4
36	106	354	118.10	1204.6
35	108.5	345	114.59	1168.8
34	108	336	111.78	1140.1
33	107.5	327	108.26	1104.2
32	107	318	105.45	1075.5
31	106	310	102.61	1046.6
30	105.5	302	99.82	1017.1
29	104.5	294	97.01	989.5
28	104	286	94.20	959.9
27	103	279	92.00	938.0
26	102.5	272	89.28	909.8
25	101.5	266	87.17	889.1
24	101	260	85.06	886.15
23	100	254	82.95	846.1
22	99	248	80.84	825.2
21	98.5	243	79.70	812.9
20	97.8	238	77.34	788.8
18	96.7	230	74.52	760.1
16	95.5	222	71.70	731.3
14	93.9	213	68.90	701.8
12	92.3	204	66.08	674.0
10	90.7	196	63.27	645.3
8	89.5	188	61.16	623.8
6	87.1	180	56.24	573.6

Grade	Designation	Constituent
		Carbon %	Silicon %	Manganese %	Sulphur % (Max.)	Phosphorus % (mAX.)	Chromium %	Vanadium %
1	45C 8	0.40 - 0350	0.10 - 0.35	0.60 - 0.90	0.050	0.050	-	-
2	55C 6	0.50 - 0.60	0.10 - 0.35	0.50 - 0.65	0.050	0.050	-	-
3	65C 6	0.60 - 0.70	0.10 - 0.35	0.50 - 0.80	0.050	0.050	-	-
4	70C 6	0.65 - 0.75	0.10 - 0.35	0.50 - 0.80	0.050	0.050	-	-
5	75C 6	0.70 - 0.80	0.10 - 0.35	0.50 - 0.80	0.050	0.050	-	-
6	80C 6	0.75 - 0.85	0.10 - 0.35	0.50 - 0.80	0.050	0.050	-	-
7	85C 6	0.80 - 0.90	0.10 - 0.35	0.50 - 0.80	0.050	0.050	-	-
8	98C 6	0.90 - 1.05	0.10 - 0.35	0.50 - 0.80	0.050	0.050	-	-
9	55Si7	0.50 - 0.60	1.50 - 2.00	0.80 - 1.00	0.050	0.050	-	-
10	50Cr4	0.45 - 0.55	0.10 - 0.35	0.60 - 0.90	0.050	0.050	0.90 - 1.20	-
11	50Cr4V2	0.45 - 0.55	0.10 - 0.35	0.50 - 0.80	0.050	0.050	0.90 - 1.20	0.15 - 0.30

		Annealed					Hardened & Tempered
Grade	Designation	Vickers Hardness HV, Max.	Yield Stress N/mm2, Min.		Tensile Strength N/mm2, Max.	Elongation, Percent, Min.	Vickers Hardness HV Max.	Yield Stress N/mm2, Min.	Tensile Strength N/mm2, Max.	Elongation, Percent, Min., Guage Length 5.65
1	45C 8	185		270	590	30	350 to 425	1030	1180 to 1420	6
2	55C 6	195
3	65C 6	205
4	70C 6	215
5	75C 6	220		290	640	25	350 to 475	1080	1180 to 1570	6
6	80C 6	220
7	85C 6	220
8	98C 6	225	310		690	25	475 to 540	1470	1570 to 1760	6
9	55Si7	240	340		780	20	475 to 570	1470	1570 to 1960	6
10	50Cr4	240	340		780	20	505 to 650	1570	1670 to 2260	5
11	50Cr4V2	240	340		780	20	555 to 670	1760	1880 to 2360	4

Note :
1.. 1N/mm2 = 1MN/m2 = 0.1020 kgf/mm2.
2.. The value for elogation for guage length L0 = 50 mm and L0 = 12.5mm should be reduced by about one-third the values specified for guage length L0 = 5.65.
3.. The strength values for the strips in the hardened and tempered conditions depend on the thickness. In view of the fact that the sterngth values are also influenced by the rolling stresses, the strength properties should be subject to mutual agreement between the purchaser and the supplier.
4.. Since slight surface decarburization is unavoidable, the hardness values specified may be considered approximate.

Cold Rolled & Annealed Steel Strips Hardened & Tempered Steel Strips
	Specifications


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