| LOW ALLOYS SPECIFICATIONS & APPLICATIONS |
| |
I.S Specification as per IS 10343. |
|
Specifications |
Chemical Composition % |
Mechanical Properties + |
|
|
Supply Condition |
Applications |
| |
|
|
C |
Mn |
Cr |
Ni |
Others |
TS Kg/mm 2 |
YS /Kg mm 2 |
Elong % |
Hardness BHN |
|
| CASE HAREDING STEEL |
3A |
B1 |
IS 4898 Gr. I BS 3146 CLA 9 BS 970 EN 32C DIN CK 15 |
0.10-0.18 |
0.60-1.0 |
|
|
|
50 |
|
12 |
|
AC OR A & CH |
Good shock resistance with high surface hardness. Used for ratchets, levers etc. |
| 3 B |
B3 |
IS 4898 Gr. II BS 3146 CLA 10 BS 970 EN 33 DIN 10 Ni 14 |
0.10-0.18 |
0.30-0.60 |
|
2.75-3.0 |
|
71 |
|
11 |
|
" |
Case hardening steels having higher core strength. Used for parts subject to recipprocating or intermittent load e.g. high speed connecting links & levers |
| 3 C |
B4 |
IS 4898 Gr. III BS 970 EN 36 C |
0.12-0.18 |
0.30-0.60 |
0.60-1.10 |
3.0-3.75 |
Mo=0.15-0.25 |
102 |
- |
7 |
|
" |
| - |
B5 |
EN 36 B 16 Ni Cr 80 |
0.12-0.18 |
0.30-0.60 |
0.60-1.10 |
3.0-3.75 |
|
102 |
- |
9 |
|
" |
| - |
B7 |
ASTM A 27 SAE 8620 |
0.18-0.23 |
0.60-1.0 |
0.35-0.65 |
0.40-0.75 |
Mo=0.15-0.25 |
60 80 |
38 38 |
24 23 |
24 23 |
A & N |
| - |
B8 |
15 Cr 3 Mo 55 CLA 7 EN 40 A |
0.15-0.25 |
0.30-0.60 |
2.50-3.50 |
0.40 Max. |
Mo=0.35-0.60 |
63 |
49 |
14 |
179-223 |
A & H.T. |
| DIRECT HARDENING STEELS |
4 D |
C1 |
IS 1570 40 Ni 2 Cr 1 Mo28 AISI 4340 BS 3146 CLA 3 BS 970 EN 24 |
0.35-0.45 |
0.45-0.70 |
1.0-1.40 |
1.30-1.80 |
Mo=0.20-0.35 |
90- 120 |
70- 105 |
|
270-320 350-400 |
Q & T Q & T |
Alloy Steels for medium to high strength, applications. Good strengh ductility, shock & fatigue strength. Used for brackets, levers etc. |
| 4 E |
C3 |
IS 1570 50 Cr 1 V 23 AISI 6150 BS 970 EN 24 50 Cr V4 |
0.45-0.55 |
0.60-1.0 |
0.8-1.2 |
|
V=0.15-0.25 |
130 |
120 |
2 |
400-500 |
Q & T |
| - |
C5 |
IS 1570 40 Cr 1 Mo 28 AISI 4140 BS 970 EN 19 |
0.35 -0.45 |
0.4-0.8 |
0.9-1.5 |
|
Mo=0.2-0.4 |
90 |
70 |
8 |
270-320 |
Q & T |
| - |
C6 |
BS 970 EN 31 |
0.90-1.10 |
0.15-0.40 |
1.0-1.6 |
|
|
|
|
|
225 |
A |
