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IS 1570 (Part 2/Sec 1):1979 35C8 Steel: Specifications & Listings

IS 1570 (Part 2/Sec 1):1979 35C8: Unalloyed carbon steel designated 35C8 in IS 1570 (Part 2/Sec 1):1979, with carbon 0.30-0.40% and manganese 0.60-0.90%. Old designation C35Mn75. The standard was reaffirmed in 2004.

Category: Carbon Steel
Grade Details
GradeIS 1570 (Part 2/Sec 1):1979 35C8
Standard IS 1570 (Part 2/Sec 1):1979
ApplicationsBillets and bars for forgings, carbon steel forgings, flame and induction hardened parts and hardened and tempered parts (the standard links this grade to IS 1875, IS 2004, IS 3930, IS 5517)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
IS 1875 Class 3A IS 1875:1992 India No activity yet
IS 11169 (Part 1) 35C8 IS 11169 (Part 1):2022 India No activity yet
SAE J403 1030 SAE J403:2001 USA No activity yet
SAE J403 1033 SAE J403:2001 USA No activity yet
SAE J403 1035 SAE J403:2001 USA No activity yet
SAE J403 1037 SAE J403:2001 USA No activity yet
SAE J403 1038 SAE J403:2001 USA No activity yet
SAE J403 1040 SAE J403:2001 USA No activity yet
SAE J403 1536 SAE J403:2001 USA No activity yet
BS 970 (Part 1) 080M36 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 060A32 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 080H36 BS 970 (Part 1):1983 UK No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 1) 080M36 BS 970 (Part 1):1983 Strong Match
SAE J403 1035 SAE J403:2014 Strong Match
BS 970 (Part 1) 080H36 BS 970 (Part 1):1983 Strong Match
SAE J403 1035 SAE J403:2001 Strong Match
SAE J403 1035 SAE J403:2009 Strong Match
SAE J403 1038 SAE J403:2014 Strong Match
SAE J403 1030 SAE J403:2014 Strong Match
SAE J403 1038 SAE J403:2001 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
0.30-0.40 0.60-0.90
Mechanical Properties
Tensile Strength 550-650 MPa
Elongation >=20%

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

From the standard
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 750400185563
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 annealed440280
Cold drawn, or cold drawn and tempered58047
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 47 under MPa; it appears to be in kgf/mm², about 461 MPa.
Source: IS 1570 (Part 2/Sec 1):1979, Edition 2.1 (Amendment 1, December 1989), Table 8

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