TECHNICAL SPECIFICATION


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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


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