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IS 1570 (Part 4):1988 40Ni6Cr4Mo2 Steel: Specifications & Listings

IS 1570 (Part 4):1988 40Ni6Cr4Mo2: 40Ni6Cr4Mo2: alloy steel (constructional or spring group) with specified chemical composition. Specified in IS 1570 (Part 4):1988.

Category: Alloy Steel
Grade Details
GradeIS 1570 (Part 4):1988 40Ni6Cr4Mo2
Standard IS 1570 (Part 4):1988
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 3) 817M40 BS 970 (Part 3):1991 Close Alternative
IS 1570 (Part 4) 40Cr5Mo6 IS 1570 (Part 4):1988 Close Alternative
BS 970 (Part 1) 817M40 BS 970 (Part 1):1983 Close Alternative
BS 970 (Part 1) 817A37 BS 970 (Part 1):1983 Close Alternative
BS 970 (Part 1) 817A42 BS 970 (Part 1):1983 Close Alternative
BS 970 (Part 1) 815H17 BS 970 (Part 1):1991 Related Material
BS 970 (Part 3) 815M17 BS 970 (Part 3):1991 Related Material
BS 970 (Part 3) 820M17 BS 970 (Part 3):1991 Related Material
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 Ni Cr Mo
0.35-0.45 0.10-0.35 0.40-0.70 1.20-1.60 0.90-1.30 0.10-0.20
Mechanical Properties
Tensile Strength 1090-1240 MPa
Yield Strength >=830 MPa (0.2 % proof stress)
Elongation >=11%
Izod Impact >=41 J
Hardness 311-363 HBS (guidance only)
Condition Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 30 mm

More data from IS 1570 (Part 4):1988

From the standard
Properties, hardened and tempered 4 strength levels
Limiting ruling section (mm)Tensile strength (MPa)0.2 % proof stress, min (MPa)Elongation, min (%)Izod impact, min (J)Brinell hardness (HBS)
150790-9405501655229-277
100890-10406501555255-311
63990-11407501348285-341
301090-12408301141311-363
Bars and forgings, oil hardened unless stated; hardness is for guidance only.
Source: IS 1570 (Part 4):1988, Table 4

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