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IS 1570 (Part 2/Sec 1):1979 25C4 Steel: Specifications & Listings

IS 1570 (Part 2/Sec 1):1979 25C4: Unalloyed carbon steel designated 25C4 in IS 1570 (Part 2/Sec 1):1979, with carbon 0.20-0.30% and manganese 0.30-0.60%. Old designation C25. The standard was reaffirmed in 2004.

Category: Carbon Steel
Grade Details
GradeIS 1570 (Part 2/Sec 1):1979 25C4
Standard IS 1570 (Part 2/Sec 1):1979
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
IS 11169 (Part 1) 25C4 IS 11169 (Part 1):2022 India No activity yet
SAE J403 1020 SAE J403:2001 USA No activity yet
SAE J403 1023 SAE J403:2001 USA No activity yet
SAE J403 1025 SAE J403:2001 USA No activity yet
BS 970 EN2D BS 970:1955 UK No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
IS 11169 (Part 1) 25C4 IS 11169 (Part 1):1984 Strong Match
SAE J403 1025 SAE J403:2014 Strong Match
SAE J403 1023 SAE J403:2014 Strong Match
SAE J403 1025 SAE J403:2001 Strong Match
SAE J403 1025 SAE J403:2009 Strong Match
SAE J403 1023 SAE J403:2001 Strong Match
SAE J403 1023 SAE J403:2009 Strong Match
BS 970 EN2D BS 970:1955 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 0.30-0.60
Mechanical Properties
Tensile Strength 440-540 MPa
Elongation >=23%

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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