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ASTM A387/A387M Grade 91 vs EN 10028-2 X10CrMoVNb9-1

Close Alternative — 79.1% match based on chemical composition and mechanical property overlap.

ASTM A387/A387M Grade 91 (ASTM A387/A387M:2011) and EN 10028-2 X10CrMoVNb9-1 (EN 10028-2:2017) are both steel grades. Both fall under the Alloy Steel category. ASTM A387/A387M Grade 91 is typically used for welded boilers and pressure vessels for elevated temperature service, while EN 10028-2 X10CrMoVNb9-1 is commonly used for flat products for pressure purposes. ASTM A387/A387M Grade 91 is defined under ASTM International, originating from United States, while EN 10028-2 X10CrMoVNb9-1 is defined under European Standard (EN), originating from Europe.

As per chemical composition, ASTM A387/A387M Grade 91 vs EN 10028-2 X10CrMoVNb9-1 is a 85.8% match. As per mechanical properties, the match is 65.7%. Combined, this makes them a close alternative overall at 79.1%.

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
85.8%
MECHANICAL MATCH
65.7%
OVERALL
79.1%
Specifications
Property ASTM A387/A387M Grade 91 EN 10028-2 X10CrMoVNb9-1
Standard ASTM A387/A387M:2011 EN 10028-2:2017
Category Alloy Steel Alloy Steel
C (%) 0.08-0.12 0.08-0.12
Mn (%) 0.30-0.60 0.30-0.60
P (%) <=0.020 <=0.020
S (%) <=0.010 <=0.005
Si (%) 0.20-0.50 <=0.50
Cr (%) 8.00-9.50 8.00-9.50
Mo (%) 0.85-1.05 0.85-1.05
Ni (%) <=0.40 <=0.30
V (%) 0.18-0.25 0.18-0.25
Nb (%) 0.06-0.10 0.06-0.10
N (%) 0.030-0.070 0.030-0.070
Al (%) <=0.02 <=0.040
Ti (%) <=0.01 Not specified
Zr (%) <=0.01 Not specified
Cu (%) Not specified <=0.30
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 10028-2 X10CrMoVNb9-1
Tensile Strength 585-760 MPa 580-760 MPa
Yield Strength >=415 MPa >=445 MPa
Elongation >=18% >=18%
Condition Class 2 plates, no thickness ranges printed; elongation in 50 mm gauge length Usual delivery condition normalized and tempered (+NT), nominal thickness up to 60 mm; transverse direction, Yield Strength is ReH, Elongation is A
Typical Applications
ASTM A387/A387M Grade 91
Welded boilers and pressure vessels for elevated temperature service
EN 10028-2 X10CrMoVNb9-1
Flat products for pressure purposes
Key Differences
Can ASTM A387/A387M Grade 91 Be Substituted With EN 10028-2 X10CrMoVNb9-1?
ASTM A387/A387M Grade 91 and EN 10028-2 X10CrMoVNb9-1 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.
On M-EX Right Now
ASTM A387/A387M Grade 91
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EN 10028-2 X10CrMoVNb9-1
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Frequently Asked Questions
What is the difference between ASTM A387/A387M Grade 91 and EN 10028-2 X10CrMoVNb9-1?
ASTM A387/A387M Grade 91 specifies Ti, Zr which are not specified for EN 10028-2 X10CrMoVNb9-1. EN 10028-2 X10CrMoVNb9-1 specifies Cu which is not specified for ASTM A387/A387M Grade 91.
Can ASTM A387/A387M Grade 91 be substituted with EN 10028-2 X10CrMoVNb9-1?
ASTM A387/A387M Grade 91 and EN 10028-2 X10CrMoVNb9-1 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.