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IS 1570 (Part 2/Sec 1):1979 55C8 Steel: Specifications & Listings

IS 1570 (Part 2/Sec 1):1979 55C8: Unalloyed carbon steel designated 55C8 in IS 1570 (Part 2/Sec 1):1979, with carbon 0.50-0.60% and manganese 0.60-0.90%. Old designation C55Mn75. The standard was reaffirmed in 2004.

Category: Carbon Steel
Grade Details
GradeIS 1570 (Part 2/Sec 1):1979 55C8
Standard IS 1570 (Part 2/Sec 1):1979
ApplicationsBillets and bars for forgings, forged steel rolls, hardened and tempered parts and engine valves (the standard links this grade to IS 1875, IS 3445, IS 5517, IS 7494)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
IS 1875 Class 5 IS 1875:1992 India No activity yet
SAE J403 1050 SAE J403:2001 USA No activity yet
SAE J403 1053 SAE J403:2001 USA No activity yet
SAE J403 1055 SAE J403:2001 USA No activity yet
SAE J403 1060 SAE J403:2001 USA No activity yet
SAE J403 1065 SAE J403:2001 USA No activity yet
SAE J403 1552 SAE J403:2001 USA No activity yet
BS 970 (Part 1) 060A57 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 080A57 BS 970 (Part 1):1983 UK No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
SAE J403 1055 SAE J403:2014 Strong Match
SAE J403 1055 SAE J403:2001 Strong Match
SAE J403 1055 SAE J403:2009 Strong Match
BS 970 (Part 1) 070M55 BS 970 (Part 1):1983 Strong Match
SAE J403 1050 SAE J403:2014 Strong Match
IS 1570 (Part 2/Sec 1) 55C4 IS 1570 (Part 2/Sec 1):1979 Strong Match
IS 1570 (Part 2/Sec 1) 50C8 IS 1570 (Part 2/Sec 1):1979 Strong Match
SAE J403 1060 SAE J403:2014 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
0.50-0.60 0.60-0.90
Mechanical Properties
Tensile Strength >=720 MPa
Elongation >=13%

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

From the standard
Cold-drawn bars, tensile by size 4 size ranges
Size (mm)Tensile strength, min (MPa)Elongation, min (%)
Up to 207307
Over 20 to 406908
Over 40 to 636709
Over 6363010
Source: IS 1570 (Part 2/Sec 1):1979, Edition 2.1 (Amendment 1, December 1989), Table 3
Hardened and tempered bars and forgings 2 tensile ranges
Tensile strength (MPa)Yield stress, min (MPa)Elongation, min (%)Limiting ruling section (mm)
700 to 8504601563
800 to 9505401330
Yield stress applies when specified.
Source: IS 1570 (Part 2/Sec 1):1979, Edition 2.1 (Amendment 1, December 1989), Table 4

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