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BS 970 EN18 vs BS 970 (Part 1) 530H40

Strong Match — 85.5% match based on chemical composition and mechanical property overlap.

BS 970 EN18 (BS 970:1955) and BS 970 (Part 1) 530H40 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN18 is typically used for gears, shafts, high tensile fasteners, while BS 970 (Part 1) 530H40 is commonly used for through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of table 6.. BS 970 EN18 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 530H40 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN18 vs BS 970 (Part 1) 530H40 is a 85.5% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 85.5%.

Frequently Compared With BS 970 EN18:
UNI 11234 100Cr6 GB/T 3077 12Cr2Ni4A GOST 4543 12HN3A NF A35-565 100C6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
85.5%
MECHANICAL MATCH
No shared data
OVERALL
85.5%
Specifications
Property BS 970 EN18 BS 970 (Part 1) 530H40
Standard BS 970:1955 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.35-0.45 0.37-0.44
Si (%) 0.10-0.35 Not specified
Mn (%) 0.60-0.95 0.50-0.90
Cr (%) 0.85-1.15 0.80-1.25
S (%) <=0.050 <=0.040
P (%) <=0.050 <=0.035
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 EN18 BS 970 (Part 1) 530H40
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 4 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN18
Gears, shafts, high tensile fasteners
BS 970 (Part 1) 530H40
Through hardening steel for mechanical and allied engineering purposes; supplied in the hardened and tempered conditions of Table 6.
Key Differences
Can BS 970 EN18 Be Substituted With BS 970 (Part 1) 530H40?
BS 970 EN18 and BS 970 (Part 1) 530H40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 530H40 is often considered as a substitute for BS 970 EN18 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
BS 970 EN18
Hex Bar → (3 listings)
Across Flats: 50–50 mm (1.97–1.97 in)
Length: 2500–2900 mm (98.43–114.17 in)
Round Bar → (3 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5000–6800 mm (196.85–267.72 in)
BS 970 (Part 1) 530H40
No active listings currently.
On M-EX Right Now
BS 970 EN18
6 active listings and RFQs →
BS 970 (Part 1) 530H40
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between BS 970 EN18 and BS 970 (Part 1) 530H40?
BS 970 EN18 specifies Si which is not specified for BS 970 (Part 1) 530H40.
Can BS 970 EN18 be substituted with BS 970 (Part 1) 530H40?
BS 970 EN18 and BS 970 (Part 1) 530H40 overlap closely enough on chemistry and mechanical properties that BS 970 (Part 1) 530H40 is often considered as a substitute for BS 970 EN18 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.