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IS 1570 (Part 4):1988 40Ni6Cr4Mo3 Steel: Specifications & Listings

IS 1570 (Part 4):1988 40Ni6Cr4Mo3: 40Ni6Cr4Mo3: 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 40Ni6Cr4Mo3
Standard IS 1570 (Part 4):1988
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
IS 4367 40Ni6Cr4Mo3 IS 4367:1991 India 0 listings, 2 RFQs →
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 3) 817M40 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 817M40 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 817A37 BS 970 (Part 1):1983 Close Alternative
BS 970 (Part 1) 817A42 BS 970 (Part 1):1983 Close Alternative
IS 1570 (Part 4) 40Cr5Mo6 IS 1570 (Part 4):1988 Close Alternative
IS 1570 (Part 4) 31Ni10Cr3Mo6 IS 1570 (Part 4):1988 Close Alternative
IS 1570 (Part 4) 16Ni6Cr7Mo3 IS 1570 (Part 4):1988 Related Material
BS 970 (Part 3) 815M17 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 1.25-1.75 0.90-1.30 0.20-0.35
Mechanical Properties
Tensile Strength 1190-1340 MPa
Yield Strength >=930 MPa (0.2 % proof stress)
Elongation >=10%
Izod Impact >=30 J
Hardness 341-401 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 6 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
150890-10406501555255-311
100990-11407501348285-341
631090-12408301141311-363
301190-13409301030341-401
30>=15401240611>=444
Bars and forgings, oil hardened unless stated; hardness is for guidance only.
Source: IS 1570 (Part 4):1988, Table 4

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