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IS 1570 (Part 3):1979 40C15S12 Steel: Specifications & Listings

IS 1570 (Part 3):1979 40C15S12: 40C15S12: carbon or carbon-manganese free cutting steel (old designation 40Mn2S12). Specified in IS 1570 (Part 3):1979.

Category: Free Machining Steel
Grade Details
GradeIS 1570 (Part 3):1979 40C15S12
Standard IS 1570 (Part 3):1979
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
BS 970 (Part 3) 216M36 BS 970 (Part 3):1991 UK No activity yet
SAE J403 1141 SAE J403:2001 USA No activity yet
BS 970 (Part 3) 226M44 BS 970 (Part 3):1991 UK No activity yet
BS 970 (Part 1) 216A42 BS 970 (Part 1):1983 UK No activity yet
SAE J403 1137 SAE J403:2001 USA No activity yet
BS 970 (Part 3) 212A42 BS 970 (Part 3):1991 UK No activity yet
BS 970 (Part 1) 216M44 BS 970 (Part 1):1983 UK No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 3) 216M36 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 216M36 BS 970 (Part 1):1983 Strong Match
SAE J403 1141 SAE J403:2001 Strong Match
SAE J403 1141 SAE J403:2009 Strong Match
SAE J403 1141 SAE J403:2014 Strong Match
BS 970 (Part 3) 226M44 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 226M44 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 216A42 BS 970 (Part 1):1983 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 Si Mn P S
0.35-0.45 <=0.25 1.30-1.70 <=0.060 0.08-0.15
Mechanical Properties
Tensile Strength 600-700 MPa
Elongation >=15%
Condition Hot rolled or normalized bars, billets and forgings (Table 2), ruling sections up to 150 mm

More data from IS 1570 (Part 3):1979

From the standard
Tensile limits, hot rolled or normalized bars, billets and forgings ruling sections up to 150 mm
Tensile strength
600 to 700 MPa
Elongation, min (gauge length 5.65 sqrt(A))
15%
Where a minimum yield stress is required, 55 percent of the minimum tensile strength should be satisfactory.
Source: IS 1570 (Part 3):1979, Table 2
Tensile limits, cold drawn bars 4 size ranges
Size (mm)Tensile strength, min (MPa)Elongation, min (%)
up to 206807
over 20 to 406408
over 40 to 6362010
over 6360011
Source: IS 1570 (Part 3):1979, Table 3
Properties, hardened and tempered bars and forgings 3 strength levels
Limiting ruling section (mm)Tensile strength (MPa)Yield stress, min, if specified (MPa)Elongation, min (%)Izod impact, min, if specified (J)
100600-7504201848
60700-8505001848
30800-9505601641
Source: IS 1570 (Part 3):1979, Table 4

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