IS 1570 (Part 2/Sec 1):1979 15C8 Steel: Specifications & Listings
IS 1570 (Part 2/Sec 1):1979 15C8: Unalloyed carbon steel designated 15C8 in IS 1570 (Part 2/Sec 1):1979, with carbon 0.10-0.20% and manganese 0.60-0.90%. Old designation C15Mn75. The standard was reaffirmed in 2004.
Boiler billets, bars and sections, welded round link chains, billets and bars for forgings, carbon steel forgings and case hardened parts (the standard links this grade to IS 2100, IS 6967, IS 1875, IS 2004, IS 4432)
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Mn
0.10-0.20
0.60-0.90
Mechanical Properties
Tensile Strength
420-500 MPa
Elongation
>=25%
More data from IS 1570 (Part 2/Sec 1):1979
From the standard
Cold-drawn bars, tensile by size4 size ranges
Size (mm)
Tensile strength, min (MPa)
Elongation, min (%)
Up to 20
540
11
Over 20 to 40
510
13
Over 40 to 63
470
15
Over 63
430
18
Source: IS 1570 (Part 2/Sec 1):1979, Edition 2.1 (Amendment 1, December 1989), Table 3
Core properties after case hardeningrefined and quenched
Tensile strength, min (MPa)
Elongation, min (%)
Izod impact, min (J)
Limiting ruling section (mm)
500
17
55
30
Properties in the core of case-hardened parts after refining and quenching. Impact value applies when specified.
Source: IS 1570 (Part 2/Sec 1):1979, Edition 2.1 (Amendment 1, December 1989), Table 5
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 15C8 Listings on M-EX (For Sale)