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BS 970 (Part 1):1991 708M40 Steel: Specifications & Listings

BS 970 (Part 1):1991 708M40: 708M40 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 708M40
Standard BS 970 (Part 1):1991
ApplicationsUsed for axles, gears, shafts, studs, crankshafts, and heavy-duty machinery parts.
Most Active InWest (Maharashtra, Gujarat)
Equivalent / Similar Grades
Grade Standard Region Live on M-EX
UNI 7845 42CrMo4 UNI 7845:1978 Italy 0 listings, 2 RFQs →
SS 14 22 44 2244 SS 14 22 44 Sweden 2 listings, 0 RFQs →
KS D3867 SCM440 KS D 3867:2025 Korea 2 listings, 0 RFQs →
BS 970 (Part 1) 709M40 BS 970 (Part 1):1991 UK 0 listings, 2 RFQs →
GOST 4543 40HM GOST 4543-2016 Russia 0 listings, 2 RFQs →
BS 970 (Part 3) 708M40 BS 970 (Part 3):1991 UK No activity yet
BS 970 (Part 1) 708H37 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 708H42 BS 970 (Part 1):1983 UK No activity yet
BS 970 (Part 1) 708A47 BS 970 (Part 1):1983 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) 708M40 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 708A40 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 3) 708M40 BS 970 (Part 3):1991 Strong Match
BS 970 (Part 1) 708A42 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 708A37 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 709M40 BS 970 (Part 1):1991 Strong Match
BS 970 (Part 1) 708H37 BS 970 (Part 1):1983 Strong Match
BS 970 (Part 1) 708H42 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 0.15-0.25

More data from BS 970 (Part 1):1991

From the standard
Other composition limits
Designation as printed
708M40
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)

Active BS 970 (Part 1):1991 708M40 Listings on M-EX (For Sale)

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BS 970 (Part 1):1991 708M40 Round Bar
7.700 MT
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BS 970 (Part 1):1991 708M40 Round Bar
2.400 MT
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