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BS 970 (Part 1):1991 709M40 Steel: Specifications & Listings

BS 970 (Part 1):1991 709M40: 709M40 is a alloy nitriding steel specified in BS 970 Part 1:1991.

Forms: Round Bar Category: Alloy Steel
Grade Details
GradeBS 970 (Part 1):1991 709M40
Standard BS 970 (Part 1):1991
ApplicationsUsed for aircraft parts, heavy-duty gears, transmission shafts, connecting rods, crankshafts, and engineering fasteners.
Most Active InWest (Gujarat, Maharashtra)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
BS 970 (Part 1) 709M40 BS 970 (Part 1):1983 UK No activity yet
IS 11169 (Part 1) 40Cr4Mo3 IS 11169 (Part 1):1984 India No activity yet
BS 970 (Part 1) 709A40 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 709A37 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 709A42 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 708M40 BS 970 (Part 1):1991 UK 2 listings, 0 RFQs →
BS 970 (Part 1) 708A40 BS 970 (Part 1):1983 UK No activity yet
BS 970 EN19A BS 970:1955 UK No activity yet
Supply & Demand by FormSee Full Supply & Demand →
Round Bar →
Low Activity
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
BS 970 (Part 1) 709M40 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 709A40 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 3) 709M40 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 709A37 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 709A42 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 708M40 BS 970 (Part 1):1991 Strong Match
BS 970 (Part 1) 708M40 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 708A40 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 Mn Cr Mo
0.36-0.44 0.70-1.00 0.90-1.20 0.25-0.35

More data from BS 970 (Part 1):1991

From the standard
Other composition limits
Designation as printed
709M40
Other limits
4 x P + Sn <0.15 %
Alloy steel for surface hardening by nitriding. Residual-element limits as printed.
Source: BS 970 (Part 1):1991, Table 4

Popular forms for this grade:

Round Bar (2)

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BS 970 (Part 1):1991 709M40 Round Bar
4.200 MT
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BS 970 (Part 1):1991 709M40 Round Bar
2.300 MT
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