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ASTM A387/A387M Grade 91 vs EN 10088-1 X11CrMoWVNb9-1-1

Related Material — 65% match based on chemical composition and mechanical property overlap.

ASTM A387/A387M Grade 91 (ASTM A387/A387M:2011) and EN 10088-1 X11CrMoWVNb9-1-1 (EN 10088-1:2023) are both steel grades. ASTM A387/A387M Grade 91 is classified under Alloy Steel, while EN 10088-1 X11CrMoWVNb9-1-1 is classified under Stainless Steel — a different category, which is worth noting alongside the chemistry match below. ASTM A387/A387M Grade 91 is defined under ASTM International, originating from United States, while EN 10088-1 X11CrMoWVNb9-1-1 is defined under European Standard (EN), originating from Europe.

As per chemical composition, ASTM A387/A387M Grade 91 vs EN 10088-1 X11CrMoWVNb9-1-1 is a 66.9% 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 65%.

Frequently Compared With ASTM A387/A387M Grade 91:
IS 1570 (Part 4) 10Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 EN 10028-2 12CrMoV12-10 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5
Match Breakdown
CHEMISTRY MATCH
66.9%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property ASTM A387/A387M Grade 91 EN 10088-1 X11CrMoWVNb9-1-1
Standard ASTM A387/A387M:2011 EN 10088-1:2023
Category Alloy Steel Stainless Steel
C (%) 0.08-0.12 0.09-0.13
Mn (%) 0.30-0.60 0.30-0.60
P (%) <=0.020 <=0.020
S (%) <=0.010 <=0.010
Si (%) 0.20-0.50 0.10-0.50
Cr (%) 8.00-9.50 8.5-9.5
Mo (%) 0.85-1.05 0.90-1.10
Ni (%) <=0.40 0.10-0.40
V (%) 0.18-0.25 0.18-0.25
Nb (%) 0.06-0.10 0.060-0.10
N (%) 0.030-0.070 0.050-0.090
Al (%) <=0.02 <=0.040
Ti (%) <=0.01 Not specified
Zr (%) <=0.01 Not specified
W (%) Not specified 0.90-1.10
B (%) Not specified 0.0005-0.0050
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property ASTM A387/A387M Grade 91 EN 10088-1 X11CrMoWVNb9-1-1
Tensile Strength 585-760 MPa Not specified
Yield Strength >=415 MPa Not specified
Elongation >=18% Not specified
Condition Class 2 plates, no thickness ranges printed; elongation in 50 mm gauge length Not specified
Typical Applications
ASTM A387/A387M Grade 91
Welded boilers and pressure vessels for elevated temperature service
EN 10088-1 X11CrMoWVNb9-1-1
Not documented
Key Differences
Can ASTM A387/A387M Grade 91 Be Substituted With EN 10088-1 X11CrMoWVNb9-1-1?
ASTM A387/A387M Grade 91 and EN 10088-1 X11CrMoWVNb9-1-1 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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ASTM A387/A387M Grade 91
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EN 10088-1 X11CrMoWVNb9-1-1
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Frequently Asked Questions
What is the difference between ASTM A387/A387M Grade 91 and EN 10088-1 X11CrMoWVNb9-1-1?
Different category: ASTM A387/A387M Grade 91 is Alloy Steel, EN 10088-1 X11CrMoWVNb9-1-1 is Stainless Steel. ASTM A387/A387M Grade 91 specifies Ti, Zr which are not specified for EN 10088-1 X11CrMoWVNb9-1-1. EN 10088-1 X11CrMoWVNb9-1-1 specifies W, B which are not specified for ASTM A387/A387M Grade 91.
Can ASTM A387/A387M Grade 91 be substituted with EN 10088-1 X11CrMoWVNb9-1-1?
ASTM A387/A387M Grade 91 and EN 10088-1 X11CrMoWVNb9-1-1 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.