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IS 1570 (Part 3):1979 40C10S18 Steel: Specifications & Listings

IS 1570 (Part 3):1979 40C10S18: 40C10S18: carbon or carbon-manganese free cutting steel (old designation 40S18). Specified in IS 1570 (Part 3):1979.

Category: Free Machining Steel
Grade Details
GradeIS 1570 (Part 3):1979 40C10S18
Standard IS 1570 (Part 3):1979
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
BS 970 (Part 3) 212A42 BS 970 (Part 3):1991 UK No activity yet
BS 970 (Part 1) 212A37 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 212M36 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 216A42 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 3) 216M36 BS 970 (Part 3):1991 UK No activity yet
BS 970 (Part 1) 216M44 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 216M28 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 225M36 BS 970 (Part 1):1983 UK No activity yet
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 3) 212A42 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 212A37 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 212A42 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 212M36 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 216A42 BS 970 (Part 1):1983 Strong 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
BS 970 (Part 1) 216M44 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 0.80-1.20 <=0.060 0.14-0.22
Mechanical Properties
Tensile Strength 550-650 MPa
Elongation >=17%
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
550 to 650 MPa
Elongation, min (gauge length 5.65 sqrt(A))
17%
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 206408
over 20 to 4060010
over 40 to 6356011
over 6355011
Source: IS 1570 (Part 3):1979, Table 3
Properties, hardened and tempered bars and forgings 2 strength levels
Limiting ruling section (mm)Tensile strength (MPa)Yield stress, min, if specified (MPa)Elongation, min (%)Izod impact, min, if specified (J)
60600-7503801841
30700-8504801735
Source: IS 1570 (Part 3):1979, Table 4

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