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IS 1570 (Part 2/Sec 1):1979 40C8 Steel: Specifications & Listings

IS 1570 (Part 2/Sec 1):1979 40C8: Unalloyed carbon steel designated 40C8 in IS 1570 (Part 2/Sec 1):1979, with carbon 0.35-0.45% and manganese 0.60-0.90%. Old designation C40. The standard was reaffirmed in 2004.

Category: Carbon Steel
Grade Details
GradeIS 1570 (Part 2/Sec 1):1979 40C8
Standard IS 1570 (Part 2/Sec 1):1979
ApplicationsHardened and tempered parts, cold rolled medium and high carbon strip and hot rolled bars for bright bars and machined parts (the standard links this grade to IS 5517, IS 7226, IS 7283)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
IS 11169 (Part 1) 40C8 IS 11169 (Part 1):2022 India No activity yet
SAE J403 1035 SAE J403:2001 USA No activity yet
SAE J403 1038 SAE J403:2001 USA No activity yet
SAE J403 1039 SAE J403:2001 USA No activity yet
SAE J403 1040 SAE J403:2001 USA No activity yet
SAE J403 1042 SAE J403:2001 USA No activity yet
BS 970 (Part 1) 080H41 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 060A40 BS 970 (Part 1):1983 UK No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
SAE J403 1038 SAE J403:2014 Strong Match
SAE J403 1040 SAE J403:2014 Strong Match
BS 970 (Part 1) 080M40 BS 970 (Part 1):1983 Strong Match
SAE J403 1038 SAE J403:2001 Strong Match
SAE J403 1040 SAE J403:2001 Strong Match
SAE J403 1038 SAE J403:2009 Strong Match
SAE J403 1040 SAE J403:2009 Strong Match
BS 970 (Part 1) 080H41 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
0.35-0.45 0.60-0.90
Mechanical Properties
Tensile Strength 580-680 MPa
Elongation >=18%

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 206408
Over 20 to 406109
Over 40 to 6357010
Over 6354012
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 (%)Izod impact, min (J)Limiting ruling section (mm)
600 to 7503801841100
700 to 850480173530
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

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