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BS 970 EN19 vs BS 970 (Part 1) 709M40

Close Alternative — 79.4% match based on chemical composition and mechanical property overlap.

BS 970 EN19 (BS 970:1955) and BS 970 (Part 1) 709M40 (BS 970 (Part 1):1991) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN19 is typically used for gears, shafts, bolts, automotive axles, while BS 970 (Part 1) 709M40 is commonly used for used for aircraft parts, heavy-duty gears, transmission shafts, connecting rods, crankshafts, and engineering fasteners.. BS 970 EN19 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 709M40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN19 vs BS 970 (Part 1) 709M40 is a 79.4% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 79.4%.

Frequently Compared With BS 970 EN19:
UNI 11234 100Cr6 NF A35-565 100C6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
79.4%
MECHANICAL MATCH
No shared data
OVERALL
79.4%
Specifications
Property BS 970 EN19 BS 970 (Part 1) 709M40
Standard BS 970:1955 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) 0.35-0.45 0.36-0.44
Si (%) 0.10-0.35 Not specified
Mn (%) 0.50-0.80 0.70-1.00
Cr (%) 0.90-1.50 0.90-1.20
Mo (%) 0.20-0.40 0.25-0.35
S (%) <=0.050 Not specified
P (%) <=0.050 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property BS 970 EN19 BS 970 (Part 1) 709M40
Tensile Strength ≥695 MPa (45 tons/sq in, converted) Not specified
Yield Strength ≥525 MPa (34 tons/sq in, converted) Not specified
Elongation ≥22% Not specified
Hardness 201-255 HB Not specified
Condition Hardened and tempered R, ruling section 6 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN19
Gears, shafts, bolts, automotive axles
BS 970 (Part 1) 709M40
Used for aircraft parts, heavy-duty gears, transmission shafts, connecting rods, crankshafts, and engineering fasteners.
Key Differences
Can BS 970 EN19 Be Substituted With BS 970 (Part 1) 709M40?
BS 970 EN19 and BS 970 (Part 1) 709M40 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
Forms & Sizes Available on M-EX
BS 970 EN19
Round Bar → (24 listings)
Diameter: 40–75 mm (1.57–2.95 in)
Length: 4900–6900 mm (192.91–271.65 in)
Forging → (4 listings)
Diameter: 180–200 mm (7.09–7.87 in)
Length: 500–1700 mm (19.69–66.93 in)
Hex Bar → (3 listings)
Across Flats: 40–40 mm (1.57–1.57 in)
Length: 2500–3100 mm (98.43–122.05 in)
Flat Bar → (3 listings)
Thickness: 40–40 mm (1.57–1.57 in)
Width: 120–120 mm (4.72–4.72 in)
Length: 3100–3900 mm (122.05–153.54 in)
BS 970 (Part 1) 709M40
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 6600–6800 mm (259.84–267.72 in)
On M-EX Right Now
BS 970 EN19
34 active listings and RFQs →
BS 970 (Part 1) 709M40
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN19 and BS 970 (Part 1) 709M40?
BS 970 EN19 specifies Si, S, P which are not specified for BS 970 (Part 1) 709M40.
Can BS 970 EN19 be substituted with BS 970 (Part 1) 709M40?
BS 970 EN19 and BS 970 (Part 1) 709M40 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.