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BS 970 EN111 vs BS 970 (Part 1) 635M15

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

BS 970 EN111 (BS 970:1955) and BS 970 (Part 1) 635M15 (BS 970 (Part 1):1983) are both steel grades. Both fall under the Alloy Steel category. BS 970 EN111 is typically used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. suitable for 45/55 (r), 50/60 (s), 55/65 (t), 60/70 (u) tons/sq in according to ruling section., while BS 970 (Part 1) 635M15 is commonly used for case hardening steel for mechanical and allied engineering purposes (table 11 mechanical properties).. BS 970 EN111 is defined under British Standards (BS), originating from United Kingdom, while BS 970 (Part 1) 635M15 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, BS 970 EN111 vs BS 970 (Part 1) 635M15 is a 74.6% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.9%.

Frequently Compared With BS 970 EN111:
IS 1570 (Part 4) 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H IS 11169 (Part 1) 10Ni5Cr4 IS 4367 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr4
Match Breakdown
CHEMISTRY MATCH
74.6%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property BS 970 EN111 BS 970 (Part 1) 635M15
Standard BS 970:1955 BS 970 (Part 1):1983
Category Alloy Steel Alloy Steel
C (%) 0.30-0.40 0.12-0.18
Si (%) 0.10-0.35 Not specified
Mn (%) 0.60-0.90 0.60-0.90
Ni (%) 1.00-1.50 0.70-1.10
Cr (%) 0.45-0.75 0.40-0.80
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 EN111 BS 970 (Part 1) 635M15
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 EN111
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for 45/55 (R), 50/60 (S), 55/65 (T), 60/70 (U) tons/sq in according to ruling section.
BS 970 (Part 1) 635M15
Case hardening steel for mechanical and allied engineering purposes (Table 11 mechanical properties).
Key Differences
Can BS 970 EN111 Be Substituted With BS 970 (Part 1) 635M15?
BS 970 EN111 and BS 970 (Part 1) 635M15 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
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BS 970 EN111
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BS 970 (Part 1) 635M15
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Frequently Asked Questions
What is the difference between BS 970 EN111 and BS 970 (Part 1) 635M15?
BS 970 EN111 specifies Si which is not specified for BS 970 (Part 1) 635M15.
Can BS 970 EN111 be substituted with BS 970 (Part 1) 635M15?
BS 970 EN111 and BS 970 (Part 1) 635M15 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.