IS 1570 (Part 2/Sec 1):1979 15C4 Steel: Specifications & Listings
IS 1570 (Part 2/Sec 1):1979 15C4: Unalloyed carbon steel designated 15C4 in IS 1570 (Part 2/Sec 1):1979, with carbon <=0.20% and manganese 0.30-0.60%. Old designation C15. The standard was reaffirmed in 2004.
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
Mechanical Properties
Tensile Strength
370-490 MPa
Elongation
>=25%
More data from IS 1570 (Part 2/Sec 1):1979
From the standard
Mild steel sheet and strip4 conditions
Condition
Tensile strength (MPa)
Elongation, min (%)
Cold rolled and annealed
320 to 440
25
Cold rolled, quarter hard
390 to 470
-
Cold rolled, half hard
470 to 570
-
Cold rolled, hard
570 min
-
Elongation on a test piece 12.5 mm wide, gauge length 50 mm.
Source: IS 1570 (Part 2/Sec 1):1979, Edition 2.1 (Amendment 1, December 1989), Tables 6 and 7
Tubes, cold drawn2 conditions
Condition
Tensile strength, min (MPa)
Yield stress, min (MPa)
Cold drawn and annealed
320
170
Cold drawn, or cold drawn and tempered
440
38
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 38 under MPa; it appears to be in kgf/mm², about 373 MPa.
Source: IS 1570 (Part 2/Sec 1):1979, Edition 2.1 (Amendment 1, December 1989), Table 8
Active IS 1570 (Part 2/Sec 1):1979 15C4 Listings on M-EX (For Sale)