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IS 1570 (Part 2/Sec 1):1979 30C8 Steel: Specifications & Listings

IS 1570 (Part 2/Sec 1):1979 30C8: Unalloyed carbon steel designated 30C8 in IS 1570 (Part 2/Sec 1):1979, with carbon 0.25-0.35% and manganese 0.60-0.90%. Old designation C30. The standard was reaffirmed in 2004.

Category: Carbon Steel
Grade Details
GradeIS 1570 (Part 2/Sec 1):1979 30C8
Standard IS 1570 (Part 2/Sec 1):1979
ApplicationsBillets and bars for forgings, carbon steel forgings, flame and induction hardened parts, hardened and tempered parts and welded round link chains (the standard links this grade to IS 1875, IS 2004, IS 3930, IS 5517, IS 6967)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
IS 1875 Class 3 IS 1875:1992 India No activity yet
IS 11169 (Part 1) 30C8 IS 11169 (Part 1):2022 India No activity yet
SAE J403 1026 SAE J403:2001 USA No activity yet
SAE J403 1029 SAE J403:2001 USA No activity yet
SAE J403 1030 SAE J403:2001 USA No activity yet
SAE J403 1035 SAE J403:2001 USA No activity yet
BS 970 (Part 3) 080A30 BS 970 (Part 3):1991 UK No activity yet
BS 970 (Part 1) 120M28 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 060A32 BS 970 (Part 1):1983 UK No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 1) 080M30 BS 970 (Part 1):1983 Strong Match
SAE J403 1029 SAE J403:2014 Strong Match
SAE J403 1030 SAE J403:2014 Strong Match
IS 1570 C30 IS 1570:1961 Strong Match
SAE J403 1029 SAE J403:2001 Strong Match
SAE J403 1030 SAE J403:2001 Strong Match
SAE J403 1029 SAE J403:2009 Strong Match
SAE J403 1030 SAE J403:2009 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
0.25-0.35 0.60-0.90
Mechanical Properties
Tensile Strength 500-600 MPa
Elongation >=21%

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 206109
Over 20 to 4057010
Over 40 to 6353012
Over 6349015
Source: IS 1570 (Part 2/Sec 1):1979, Edition 2.1 (Amendment 1, December 1989), Table 3
Hardened and tempered bars and forgings 1 tensile range
Tensile strength (MPa)Yield stress, min (MPa)Elongation, min (%)Izod impact, min (J)Limiting ruling section (mm)
600 to 750400185530
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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