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ASTM A240/A240M S31727 vs ASTM A959 317LMN

Close Alternative — 77.3% match based on chemical composition and mechanical property overlap.

ASTM A240/A240M S31727 (ASTM A240/A240M:2025) and ASTM A959 317LMN (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S31727 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A959 317LMN is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). ASTM A240/A240M S31727 is defined under ASTM International, originating from United States, while ASTM A959 317LMN is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A240/A240M S31727 vs ASTM A959 317LMN is a 77.3% 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 77.3%.

Frequently Compared With ASTM A240/A240M S31727:
GOST 5632 06Kh23N28 GOST 5632 08X18H10 EN 10088-1 1.4006 IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12Ni2Mo EN 10088-1 1.4301 EN 10088-1 1.4401 EN 10088-1 1.4845 ASTM A959 .- GB/T 3280 06Cr19Ni10 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoVH
Match Breakdown
CHEMISTRY MATCH
77.3%
MECHANICAL MATCH
No shared data
OVERALL
77.3%
Specifications
Property ASTM A240/A240M S31727 ASTM A959 317LMN
Standard ASTM A240/A240M:2025 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.030 <=0.030
Mn (%) <=1.00 <=2.00
P (%) <=0.030 <=0.045
S (%) <=0.030 <=0.030
Si (%) <=1.00 <=1.00
Cr (%) 17.5-19.0 17.0-20.0
Ni (%) 14.5-16.5 13.5-17.5
Mo (%) 3.8-4.5 4.0-5.0
N (%) 0.15-0.21 0.10-0.20
Cu (%) 2.80-4.00 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 ASTM A240/A240M S31727 ASTM A959 317LMN
Tensile Strength >=550 MPa Not specified
Yield Strength >=245 MPa Not specified
Elongation >=35% Not specified
Hardness <=217 HB Not specified
Condition Plate, sheet and strip; yield by 0.2 percent offset Not specified
Typical Applications
ASTM A240/A240M S31727
Pressure vessels and general applications (plate, sheet and strip)
ASTM A959 317LMN
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
Can ASTM A240/A240M S31727 Be Substituted With ASTM A959 317LMN?
ASTM A240/A240M S31727 and ASTM A959 317LMN 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.
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ASTM A240/A240M S31727
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ASTM A959 317LMN
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S31727 and ASTM A959 317LMN?
ASTM A240/A240M S31727 specifies Cu which is not specified for ASTM A959 317LMN.
Can ASTM A240/A240M S31727 be substituted with ASTM A959 317LMN?
ASTM A240/A240M S31727 and ASTM A959 317LMN 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.