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ASTM A240/A240M S44400 vs ASTM A959 XM-18

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

ASTM A240/A240M S44400 (ASTM A240/A240M:2025) and ASTM A959 XM-18 (ASTM A959:2011) are both steel grades. Both fall under the Stainless Steel category. ASTM A240/A240M S44400 is typically used for pressure vessels and general applications (plate, sheet and strip), while ASTM A959 XM-18 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). ASTM A240/A240M S44400 is defined under ASTM International, originating from United States, while ASTM A959 XM-18 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A240/A240M S44400 vs ASTM A959 XM-18 is a 71.1% 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 ASTM A240/A240M S44400:
EN 10088-1 1.4401 EN 10088-1 1.4006 EN 10088-1 1.4845 GOST 5632 08X18H10 EN 10088-1 1.4301 IS 1570 (Part 7) 11Cr17Ni13W3TiH IS 1570 (Part 7) 12Cr12MoH IS 1570 (Part 7) 12Cr12MoVH IS 1570 (Part 7) 12Cr12Ni2Mo ASTM A959 .- GB/T 3280 06Cr19Ni10 GOST 5632 06Kh23N28
Match Breakdown
CHEMISTRY MATCH
71.1%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property ASTM A240/A240M S44400 ASTM A959 XM-18
Standard ASTM A240/A240M:2025 ASTM A959:2011
Category Stainless Steel Stainless Steel
C (%) <=0.025 <=0.03
Mn (%) <=1.00 7.5-9.0
P (%) <=0.040 <=0.045
S (%) <=0.030 <=0.030
Si (%) <=1.00 <=1.00
Cr (%) 17.5-19.5 17.5-20.5
Ni (%) <=1.00 5.0-7.0
Mo (%) 1.75-2.50 2.00-3.00
N (%) <=0.035 0.25-0.50
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 S44400 ASTM A959 XM-18
Tensile Strength >=415 MPa Not specified
Yield Strength >=275 MPa Not specified
Elongation >=20% 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 S44400
Pressure vessels and general applications (plate, sheet and strip)
ASTM A959 XM-18
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Can ASTM A240/A240M S44400 Be Substituted With ASTM A959 XM-18?
ASTM A240/A240M S44400 and ASTM A959 XM-18 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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ASTM A240/A240M S44400
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ASTM A959 XM-18
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Frequently Asked Questions
What is the difference between ASTM A240/A240M S44400 and ASTM A959 XM-18?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A240/A240M S44400 be substituted with ASTM A959 XM-18?
ASTM A240/A240M S44400 and ASTM A959 XM-18 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.