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BS 970 EN40C vs EN 10088-1 X39CrMo17-1

Related Material — 64.3% match based on chemical composition and mechanical property overlap.

BS 970 EN40C (BS 970:1955) and EN 10088-1 X39CrMo17-1 (EN 10088-1:2014) are both steel grades. BS 970 EN40C is classified under Alloy Steel, while EN 10088-1 X39CrMo17-1 is classified under Stainless Steel — a different category, which is worth noting alongside the chemistry match below. BS 970 EN40C is defined under British Standards (BS), originating from United Kingdom, while EN 10088-1 X39CrMo17-1 is defined under European Standard (EN), originating from Europe.

As per chemical composition, BS 970 EN40C vs EN 10088-1 X39CrMo17-1 is a 64.3% 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 64.3%.

Frequently Compared With BS 970 EN40C:
IS 1570 (Part 7) 10Cr36Mo10H IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 4367 10Cr9Mo10 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6
Match Breakdown
CHEMISTRY MATCH
64.3%
MECHANICAL MATCH
No shared data
OVERALL
64.3%
Specifications
Property BS 970 EN40C EN 10088-1 X39CrMo17-1
Standard BS 970:1955 EN 10088-1:2014
Category Alloy Steel Stainless Steel
C (%) 0.30-0.50 0.33-0.45
Si (%) 0.10-0.35 <=1.00
Mn (%) 0.40-0.80 <=1.50
Ni (%) <=0.40 <=1.00
Cr (%) 2.50-3.50 15.5-17.5
Mo (%) 0.70-1.20 0.80-1.30
V (%) 0.10-0.30 Not specified
S (%) <=0.050 <=0.015
P (%) <=0.050 <=0.040
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 EN40C EN 10088-1 X39CrMo17-1
Tensile Strength ≥1313 MPa (85 tons/sq in, converted) Not specified
Yield Strength ≥1112 MPa (72 tons/sq in, converted) Not specified
Elongation ≥10% Not specified
Hardness 375-444 HB Not specified
Condition Hardened and tempered (single condition), ruling section 2 1/2 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN40C
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable where higher core strength is required for nitriding than En 40B provides; purchaser recommended to consult the manufacturer.
EN 10088-1 X39CrMo17-1
Not documented
Key Differences
Can BS 970 EN40C Be Substituted With EN 10088-1 X39CrMo17-1?
BS 970 EN40C and EN 10088-1 X39CrMo17-1 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 EN40C
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EN 10088-1 X39CrMo17-1
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Frequently Asked Questions
What is the difference between BS 970 EN40C and EN 10088-1 X39CrMo17-1?
Different category: BS 970 EN40C is Alloy Steel, EN 10088-1 X39CrMo17-1 is Stainless Steel. BS 970 EN40C specifies V which is not specified for EN 10088-1 X39CrMo17-1.
Can BS 970 EN40C be substituted with EN 10088-1 X39CrMo17-1?
BS 970 EN40C and EN 10088-1 X39CrMo17-1 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.