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BS 970 EN57 vs ASTM A959 431

Strong Match — 87.6% match based on chemical composition and mechanical property overlap.

BS 970 EN57 (BS 970:1955) and ASTM A959 431 (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. BS 970 EN57 is typically used for bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. suitable for tensile strength of 55 tons/sq in min., while ASTM A959 431 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). BS 970 EN57 is defined under British Standards (BS), originating from United Kingdom, while ASTM A959 431 is defined under ASTM International, originating from United States.

As per chemical composition, BS 970 EN57 vs ASTM A959 431 is a 87.6% 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 87.6%.

Frequently Compared With BS 970 EN57:
EN 10088-1 1.4301 IS 1570 (Part 7) 11Cr17Ni13W3TiH GB/T 3280 06Cr19Ni10 GOST 5632 08X18H10 IS 1570 (Part 7) 12Cr12MoVH ASTM A959 .- GOST 5632 06Kh23N28 EN 10088-1 1.4006 EN 10088-1 1.4401 EN 10088-1 1.4845 IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12Ni2Mo
Match Breakdown
CHEMISTRY MATCH
87.6%
MECHANICAL MATCH
No shared data
OVERALL
87.6%
Specifications
Property BS 970 EN57 ASTM A959 431
Standard BS 970:1955 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.25 <=0.20
Si (%) 0.10-1.00 <=1.00
Mn (%) <=1.00 <=1.00
Ni (%) 1.00-3.00 1.25-2.50
Cr (%) 15.5-20.0 15.0-17.0
S (%) <=0.045 <=0.030
P (%) <=0.045 <=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 EN57 ASTM A959 431
Tensile Strength ≥849 MPa (55 tons/sq in, converted) Not specified
Yield Strength ≥680 MPa (44 tons/sq in, converted) Not specified
Elongation ≥15% Not specified
Hardness 248 HB Not specified
Condition Hardened and tempered (ruling 6), ruling section 6 in (lowest-strength condition of the standard) Not specified
Typical Applications
BS 970 EN57
Bars and billets for forging; forgings and drop-forgings; bars for machining; bright bars. Suitable for tensile strength of 55 tons/sq in min.
ASTM A959 431
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Can BS 970 EN57 Be Substituted With ASTM A959 431?
BS 970 EN57 and ASTM A959 431 overlap closely enough on chemistry and mechanical properties that ASTM A959 431 is often considered as a substitute for BS 970 EN57 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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BS 970 EN57
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ASTM A959 431
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Frequently Asked Questions
What is the difference between BS 970 EN57 and ASTM A959 431?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can BS 970 EN57 be substituted with ASTM A959 431?
BS 970 EN57 and ASTM A959 431 overlap closely enough on chemistry and mechanical properties that ASTM A959 431 is often considered as a substitute for BS 970 EN57 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.