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

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

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

As per chemical composition, EN 10028-2 X10CrMoVNb9-1 vs ASTM A387/A387M Grade 91 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 EN 10028-2 X10CrMoVNb9-1:
UNI 11234 100Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 EN 10028-2 12CrMo9-10 EN 10028-2 12CrMoV12-10 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 105Cr5 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
85.8%
MECHANICAL MATCH
65.7%
OVERALL
79.1%
Specifications
Property EN 10028-2 X10CrMoVNb9-1 ASTM A387/A387M Grade 91
Standard EN 10028-2:2017 ASTM A387/A387M:2011
Category Alloy Steel Alloy Steel
C (%) 0.08-0.12 0.08-0.12
Si (%) <=0.50 0.20-0.50
Mn (%) 0.30-0.60 0.30-0.60
P (%) <=0.020 <=0.020
S (%) <=0.005 <=0.010
Al (%) <=0.040 <=0.02
N (%) 0.030-0.070 0.030-0.070
Cr (%) 8.00-9.50 8.00-9.50
Cu (%) <=0.30 Not specified
Mo (%) 0.85-1.05 0.85-1.05
Nb (%) 0.06-0.10 0.06-0.10
Ni (%) <=0.30 <=0.40
V (%) 0.18-0.25 0.18-0.25
Ti (%) Not specified <=0.01
Zr (%) Not specified <=0.01
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property EN 10028-2 X10CrMoVNb9-1 ASTM A387/A387M Grade 91
Tensile Strength 580-760 MPa 585-760 MPa
Yield Strength >=445 MPa >=415 MPa
Elongation >=18% >=18%
Condition Usual delivery condition normalized and tempered (+NT), nominal thickness up to 60 mm; transverse direction, Yield Strength is ReH, Elongation is A Class 2 plates, no thickness ranges printed; elongation in 50 mm gauge length
Typical Applications
EN 10028-2 X10CrMoVNb9-1
Flat products for pressure purposes
ASTM A387/A387M Grade 91
Welded boilers and pressure vessels for elevated temperature service
Key Differences
Can EN 10028-2 X10CrMoVNb9-1 Be Substituted With ASTM A387/A387M Grade 91?
EN 10028-2 X10CrMoVNb9-1 and ASTM A387/A387M Grade 91 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
EN 10028-2 X10CrMoVNb9-1
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ASTM A387/A387M Grade 91
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Frequently Asked Questions
What is the difference between EN 10028-2 X10CrMoVNb9-1 and ASTM A387/A387M Grade 91?
EN 10028-2 X10CrMoVNb9-1 specifies Cu which is not specified for ASTM A387/A387M Grade 91. ASTM A387/A387M Grade 91 specifies Ti, Zr which are not specified for EN 10028-2 X10CrMoVNb9-1.
Can EN 10028-2 X10CrMoVNb9-1 be substituted with ASTM A387/A387M Grade 91?
EN 10028-2 X10CrMoVNb9-1 and ASTM A387/A387M Grade 91 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.