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Grades/Chemical Compositions

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Carbon Steel

Plain carbon steel

S.NO GRADE C MN SI S P Cr Ni Mo V B HARDNESS
1 15C8 0.10-0.20 0.60-0.90 0.15-0.35 0.05 Max 0.05 Max - - - - - 130-150 BHN
2 35C8 0.30-0.40 0.60-0.90 0.15-0.35 0.05 Max 0.05 Max - - - - - 170-200 BHN
3 C20 0.15-0.25 0.60-0.90 0.05-0.35 0.05 Max 0.05 Max - - - - - 120-150 BHN
4 C30 0.25-0.35 0.60-0.90 0.05-0.35 0.05 Max 0.05 Max - - - - - 160-190 BHN
5 C35 0.30-0.40 0.60-0.90 0.05-0.35 0.05 Max 0.05 Max - - - - - 170-200 BHN
6 C40 0.35-0.45 0.60-0.90 0.05-0.35 0.05 Max 0.05 Max - - - - - 170-210 BHN
7 C45 0.40-0.50 0.60-0.90 0.15-0.35 0.05 Max 0.05 Max - - - - - 180-210 BHN
8 C50 0.45-0.55 0.60-0.90 0.15-0.35 0.05 Max 0.05 Max - - - - - 180-220 BHN
9 EN8 0.35-0.45 0.60-10.00 0.10-0.35 0.05 Max 0.05 Max - - - - - 170-200 BHN
10 EN8D 0.40-0.45 0.70-00.90 0.10-0.35 0.05 Max 0.05 Max - - - - - 180-210 BHN
11 EN9 0.50-0.60 0.50-0.80 0.15-0.35 0.05 Max 0.05 Max - - - - - 180-230 BHN
12 EN32B 0.10-0.18 0.60-1.0 0.05-0.35 0.05 Max 0.05 Max - - - - - 130-160 BHN
13 SAE-1008 0.10 Max 0.30-0.50 0.10 Max 0.05 Max 0.04 Max - - - - - 120-150 BHN
14 SAE-1010 0.08-0.13 0.30-0.60 0.05-0.35 0.035 Max 0.035 Max - - - - - 120-140 BHN
15 SAE-1018 0.15-0.20 0.60-0.90 0.15-0.35 0.035 Max 0.035 Max - - - - - 130-160 BHN
16 SAE-1020 0.18-0.23 0.30-0.60 0.15-0.35 0.05 Max 0.04 Max - - - - - 130-150 BHN
17 SAE-1025 0.22-0.28 0.30-0.60 0.15-0.35 0.05 Max 0.04 Max - - - - - 130-160 BHN
18 SAE-1040 0.37-0.44 0.60-0.90 0.15-0.35 0.05 Max 0.04 Max - - - - - 170-200 BHN
19 SAE-1045 0.43-0.50 0.60-0.90 0.15-0.35 0.05 Max 0.04 Max - - - - - 170-230 BHN
20 SAE-1050 0.48-0.55 0.60-0.90 0.15-0.35 0.05 Max 0.04 Max - - - - - 180-220 BHN
21 ASTM-105 0.35 Max 0.6-1.0 0.10-0.35 0.05 Max 0.04 Max - - - - - 130-180 BHN

Carbon Mangnese Steel

S.NO GRADE C MN SI S P Cr Ni Mo V B HARDNESS
22 20MN2 0.16-0.24 1.30-1.70 0.10-0.35 0.035 Max 0.035 Max - - - - - 140-170 BHN
23 27MN2 0.22-0.32 1.30-1.70 0.10-0.35 0.035 Max 0.035 Max - - - - - 150-180 BHN
24 EN15 0.30-0.40 1.30-1.70 0.10-0.35 0.035 Max 0.035 Max - - - - - 180-220 BHN
25 SAE-1541 0.38-0.43 1.30-1.70 0.10-0.35 0.035 Max 0.035 Max - - - - - 190-230 BHN
26 SAE-1524 0.19-0.25 1.35-1.65 0.15-0.35 0.035 Max 0.035 Max - - - - - 180-220 BHN
27 ST-52.3 0.16-0.22 1.30-1.65 0.15-0.35 0.035 Max 0.035 Max - - - - - 190-220 BHN

Case Hardening Steel

S.NO GRADE C MN SI S P Cr Ni Mo V B HARDNESS
28 16MNCR5 0.14-0.19 1.0-1.3 0.10-0.40 0.035 Max 0.035 Max 0.80-1.10 - - - - 170-190 BHN
29 20MNCR5 0.17-0.22 1.10-1.40 0.15-0.40 0.035 Max 0.035 Max 1.0-1.10 - - - - 170-210 BHN
30 15CR3 0.12-0.18 0.40-0.60 0.15-0.40 0.035 Max 0.035 Max 0.40-0.70 - - - - 160-200 BHN
31 SAE-8617 0.15-0.20 0.70-0.90 0.15-0.35 0.035 Max 0.035 Max 0.40-0.60 0.40-0.70 0.15-0.25 - - 160-200 BHN
32 SAE-8620 0.18-0.23 0.70-0.90 0.15-0.35 0.035 Max 0.035 Max 0.40-0.60 0.40-0.70 0.15-0.25 - - 165-210 BHN
33 EN-351 0.10-0.20 0.6-1.0 0.15-0.035 0.035 Max 0.035 Max 0.40-0.80 0.60-1.0 .10 Max - - 170-200 BHN
34 EN-353 0.20 Max 0.5-1.0 0.05-0.035 0.035 Max 0.035 Max 0.75-1.25 1.0-1.5 0.08-0.15 - - 180-215 BHN

Ball Bearing Steel

S.NO GRADE C MN SI S P Cr Ni Mo V B HARDNESS
35 EN-31 0.9-1.20 0.30-0.75 0.15-0.35 0.035 Max 0.035 Max 1.0-1.6 - - - - 290-340 BHN
36 SAE-52100 0.98-1.10 0.25-0.45 0.15-0.30 0.025 Max 0.025 Max 1.30-1.60 - - - - 290-340 BHN

Free/Semi Free Cutting Steel

S.NO GRADE C MN SI S P Cr Ni Mo V B HARDNESS
37 EN-1A 0.07-0.15 0.8-1.2 0.10 Max 0.20-0.30 0.07 Max - - - - - 130-140 BHN
38 EN-15AM 0.30-0.40 1.30-1.70 0.25 Max 0.12-0.2 0.06 - - - - - 180-230 BHN
39 EN-8M 0.35-0.45 1.0-1.3 0.25 Max 0.12-0.20 0.06 - - - - - 170-200 BHN

Oil Hardening Steel

S.NO GRADE C MN SI S P Cr Ni Mo V B HARDNESS
40 40CR4 0.38-0.44 0.60-0.90 0.15-0.35 0.035 Max 0.035 Max 0.90-1.20 - - - - 230-255 BHN
41 41CR4 0.38-0.45 0.60-0.90 0.15-0.35 0.035 Max 0.035 Max 0.90-1.20 - - - - 230-260 BHN
42 25CRMO4 0.24-0.29 0.50-0.90 0.15-0.40 0.035 Max 0.035 Max 0.90-1.20 - 0.15-0.30 - - 240-260 BHN
43 31CR4 0.28-0.35 0.60-0.90 0.15-0.35 0.035 Max 0.035 Max 0.90-1.20 - - - - 220-250BHN
44 42CRMO4 0.38-0.45 0.60-0.80 0.15-0.35 0.035 Max 0.035 Max 0.90-1.20 - 0.15-0.30 - - 280-310 BHN
45 SAE-4140 0.38-0.43 0.75-1.0 0.15-0.35 0.035 Max 0.035 Max 0.90-1.20 - 0.15-0.25 - - 280-310 BHN
46 SCM-435 0.33-0.38 0.60-0.90 0.15-0.35 0.035 Max 0.035 Max 0.90-1.20 - 0.15-0.30 - - 260-290 BHN
47 B16 0.36-0.47 0.45-0.70 0.15-0.35 0.035 Max 0.035 Max 0.80-1.15 - - - - 250-280 BHN
48 31CRV3 0.28-0.35 0.40-0.60 0.25-0.40 0.035 Max 0.035 Max 0.40-0.70 - - 0.07-0.12 - 190-230 BHN
49 34CR4 0.32-0.37 0.60-0.90 0.15-0.35 0.035 Max 0.035 Max 0.90-1.20 - - - - 180-220 BHN
50 EN-16 0.30-0.40 1.30-1.80 0.10-0.35 0.035 Max 0.035 Max - - 0.20-0.35 - - 210-235 BHN
51 EN-18 0.35-0.45 0.60-0.90 0.10-0.35 0.035 Max 0.035 Max 0.85-1.15 - - - - 230-260 BHN
52 EN-19 0.35-0.45 0.50-0.80 0.10-0.35 0.035 Max 0.035 Max 0.90-1.50 - 0.20-0.40 - - 290-320 BHN
53 EN-24 0.35-0.45 0.45-0.70 0.10-0.35 0.035 Max 0.035 Max 0.90-1.40 1.30-1.80 0.20-0.35 - - 320-350 BHN
54 EN-36C 0.12-0.18 0.30-0.60 0.10-0.35 0.035 Max 0.035 Max 0.60-1.10 3.0-3.75 0.10-0.25 - - 240-270 BHN
55 EN-45A 0.55-0.65 0.70-1.00 1.70-2.0 0.035 Max 0.035 Max - - - - - 250-290 BHN
56 SAE-4042 0.40-0.45 0.70-0.90 0.15-0.35 0.035 Max 0.035 Max - - 2.0-3.0 - - 320-350 BHN
57 EN-47 0.45-0.55 0.50-0.80 0.50 Max 0.040 Max 0.040 Max 0.80-1.20 - - 0.15 Max - 260-310 BHN

Boron Steel

S.NO GRADE C MN SI S P Cr Ni Mo V B HARDNESS
58 10B-21 0.18-0.23 0.80-1.20 0.15-0.35 0.035 Max 0.035 Max - - - - 0.0005-0.003 130-150 BHN
59 15B-25 0.19-0.25 1.35-1.65 0.15-0.30 0.035 Max 0.035 Max - - - - 0.0005-0.003 150-180 BHN
60 27MNCRB5 0.24-0.30 1.10-1.40 0.040 Max 0.040 Max 0.035 Max 0.30-0.60 - - - 0.00008-0.005 230-270 BHN
61 15B-41 0.38-0.43 1.30-1.70 0.10-0.35 0.035 Max 0.035 Max - - - - 0.0005-0.003 190-240 BHN

Austenitic Stainless Steel

S.NO GRADE C MN SI S P Cr Ni Mo V B HARDNESS
62 AISI-304 0.08 Max 2.0 Max 1.0 Max 0.04 Max 0.045 Max 18.0-20.0 8.0-10.5 - - - -
63 AISI-316 0.08 Max 2.0 Max 1.0 Max 0.04 Max 0.045 Max 16.0-18.0 10.0-14.0 2.0-3.0 - - -

Martensitic Stainless Steel

S.NO GRADE C MN SI S P Cr Ni Mo V B HARDNESS
64 AISI-410 0.15 Max 1.0 Max 1.0 Max 0.03 Max 0.04 Max 11.5-13.5 - - - - 330-370
65 AISI-420 0.15 Max 1.0 Max 1.0 Max 0.03 Max 0.04 Max 12.0-14.0 - - - - 340-380
66 AISI-431 0.20 Max 1.0 Max 1.0 Max 0.03 Max 0.04 Max 15.0-17.0 1.25-2.50 - - - 380-410

Tool Steel

S.NO GRADE C MN SI S P Cr Ni Mo V B HARDNESS
67 H11 0.32-0.42 0.30-0.40 0.85-1.15 0.035 Max 0.035 Max 4.75-5.25 - 1.25-1.75 0.30-0.50 - 340-380
68 H13 0.37-0.43 0.30-0.40 0.90-1.20 0.035 Max 0.035 Max 4.80-5.50 - 1.20-1.50 0.90-1.10 - 340-380
69 D2 1.4-1.6 0.30-0.50 0.30-0.50 0.035 Max 0.035 Max 11.0-13.0 - 0.70-1.20 0.70-0.80 - -
70 D3 2.0-2.25 0.30 Max 0.30 Max 0.035 Max 0.035 Max 11.0-13.0 - - - - -

Hot Forging Die Blocks

S.NO GRADE C MN SI S P Cr Ni Mo V B HARDNESS
71 DB6 0.50-0.60 0.65-0.80 0.15-0.35 0.035 Max 0.035 Max 1.0-1.20 1.55-1.70 0.40-0.50 0.07-0.15 - -

Spring Steels

S.NO GRADE C MN SI S P Cr Ni Mo V B HARDNESS
72 SUP9 0.52-0.58 0.65-0.95 0.15-0.35 0.030 Max 0.030 Max 0.65-0.95 - - - - 200-240
73 SUP11 0.48-0.53 0.75-1.00 0.15-0.30 0.035 Max 0.04 Max 0.40-0.60 - - - 0.0005-0.003 230-260

 

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