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IS 1570 (Part 2/Sec 1):1979 45C8 Steel: Specifications & Listings

IS 1570 (Part 2/Sec 1):1979 45C8: Unalloyed carbon steel designated 45C8 in IS 1570 (Part 2/Sec 1):1979, with carbon 0.40-0.50% and manganese 0.60-0.90%. Old designation C45. The standard was reaffirmed in 2004.

Category: Carbon Steel
Grade Details
GradeIS 1570 (Part 2/Sec 1):1979 45C8
Standard IS 1570 (Part 2/Sec 1):1979
ApplicationsBillets and bars for forgings, carbon steel forgings, cold rolled strip for springs, flame and induction hardened parts, shipbuilding forgings and hardened and tempered parts (the standard links this grade to IS 1875, IS 2004, IS 2507, IS 3930, IS 3261, IS 5517)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
IS 1875 Class 4 IS 1875:1992 India No activity yet
IS 11169 (Part 1) 45C8 IS 11169 (Part 1):2022 India No activity yet
SAE J403 1040 SAE J403:2001 USA No activity yet
SAE J403 1042 SAE J403:2001 USA No activity yet
SAE J403 1043 SAE J403:2001 USA No activity yet
SAE J403 1044 SAE J403:2001 USA No activity yet
SAE J403 1045 SAE J403:2001 USA No activity yet
SAE J403 1046 SAE J403:2001 USA No activity yet
SAE J403 1049 SAE J403:2001 USA No activity yet
SAE J403 1050 SAE J403:2001 USA No activity yet
BS 970 (Part 1) 080H46 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 135M44 BS 970 (Part 1):1983 UK No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
SAE J403 1042 SAE J403:2014 Strong Match
SAE J403 1045 SAE J403:2014 Strong Match
BS 970 (Part 1) 080M46 BS 970 (Part 1):1983 Strong Match
SAE J403 1042 SAE J403:2001 Strong Match
SAE J403 1045 SAE J403:2001 Strong Match
SAE J403 1042 SAE J403:2009 Strong Match
SAE J403 1045 SAE J403:2009 Strong Match
BS 970 (Part 1) 080H46 BS 970 (Part 1):1983 Strong Match
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Mn
0.40-0.50 0.60-0.90
Mechanical Properties
Tensile Strength 630-710 MPa
Elongation >=15%

More data from IS 1570 (Part 2/Sec 1):1979

From the standard
Hardened and tempered bars and forgings 2 tensile ranges
Tensile strength (MPa)Yield stress, min (MPa)Elongation, min (%)Izod impact, min (J)Limiting ruling section (mm)
600 to 7503801741100
700 to 850480153530
Yield stress and impact value apply when specified.
Source: IS 1570 (Part 2/Sec 1):1979, Edition 2.1 (Amendment 1, December 1989), Table 4
Tubes, cold drawn 2 conditions
ConditionTensile strength, min (MPa)Yield stress, min (MPa)
Cold drawn and annealed520340
Cold drawn, or cold drawn and tempered70060
Elongation, min: 950 divided by the actual tensile strength in kgf/mm² on a gauge length of 5.65 times the square root of the cross-section, or 1100 divided by it on 4 times the square root. Table 8 of the standard prints this yield stress as 60 under MPa; it appears to be in kgf/mm², about 588 MPa.
Source: IS 1570 (Part 2/Sec 1):1979, Edition 2.1 (Amendment 1, December 1989), Table 8

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