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IS 1570 (Part 2/Sec 1):1979 25C8 Steel: Specifications & Listings

IS 1570 (Part 2/Sec 1):1979 25C8: Unalloyed carbon steel designated 25C8 in IS 1570 (Part 2/Sec 1):1979, with carbon 0.20-0.30% and manganese 0.60-0.90%. Old designation C25Mn75. The standard was reaffirmed in 2004.

Category: Carbon Steel
Grade Details
GradeIS 1570 (Part 2/Sec 1):1979 25C8
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 2A IS 1875:1992 India No activity yet
IS 11169 (Part 1) 25C8 IS 11169 (Part 1):2022 India No activity yet
SAE J403 1021 SAE J403:2001 USA No activity yet
SAE J403 1022 SAE J403:2001 USA 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 1526 SAE J403:2001 USA No activity yet
SAE J403 1527 SAE J403:2001 USA No activity yet
BS 970 (Part 1) 070M26 BS 970 (Part 1):1983 UK No activity yet
BS 970 EN2D BS 970:1955 UK No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 1) 070M26 BS 970 (Part 1):1983 Strong Match
SAE J403 1026 SAE J403:2014 Strong Match
SAE J403 1026 SAE J403:2001 Strong Match
SAE J403 1026 SAE J403:2009 Strong Match
SAE J403 1029 SAE J403:2014 Strong Match
IS 11169 (Part 1) 25C4 IS 11169 (Part 1):1984 Strong Match
SAE J403 1029 SAE J403:2001 Strong Match
SAE J403 1029 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
0.20-0.30 0.60-0.90
Mechanical Properties
Tensile Strength 470-570 MPa
Elongation >=22%

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

From the standard
Tubes, cold drawn 2 conditions
ConditionTensile strength, min (MPa)Yield stress, min (MPa)
Cold drawn and annealed390250
Cold drawn, or cold drawn and tempered56046
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 46 under MPa; it appears to be in kgf/mm², about 451 MPa.
Source: IS 1570 (Part 2/Sec 1):1979, Edition 2.1 (Amendment 1, December 1989), Table 8

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