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ASTM A387/A387M:2011 Grade 91 Steel: Specifications & Listings

ASTM A387/A387M:2011 Grade 91: Grade 91: 9Cr-1Mo-V-Nb chromium-molybdenum alloy steel plate for welded boilers and pressure vessels at elevated temperature. Specified in ASTM A387/A387M:2011.

Category: Alloy Steel
Grade Details
GradeASTM A387/A387M:2011 Grade 91
Standard ASTM A387/A387M:2011
ApplicationsWelded boilers and pressure vessels for elevated temperature service
Grade ComparisonCompare With a Specific Grade →
Grade Standard Match
EN 10028-2 X10CrMoVNb9-1 EN 10028-2:2017 Close Alternative
EN 10088-1 X10CrMoVNb9-1 EN 10088-1:2014 Related Material
EN 10088-1 X11CrMoWVNb9-1-1 EN 10088-1:2014 Related Material
EN 10088-1 X10CrMoVNb9-1 EN 10088-1:2023 Related Material
EN 10088-1 X11CrMoWVNb9-1-1 EN 10088-1:2023 Related Material
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C Mn P S Si Cr Mo Ni V Nb N Al Ti Zr
0.08-0.12 0.30-0.60 <=0.020 <=0.010 0.20-0.50 8.00-9.50 0.85-1.05 <=0.40 0.18-0.25 0.06-0.10 0.030-0.070 <=0.02 <=0.01 <=0.01
Mechanical Properties
Tensile Strength 585-760 MPa
Yield Strength >=415 MPa
Elongation >=18%
Condition Class 2 plates, no thickness ranges printed; elongation in 50 mm gauge length

More data from ASTM A387/A387M:2011

From the standard
Tensile properties by class 1 class
ClassTensile strength (MPa)Yield strength, min (MPa)Elongation in 50 mm, min (%)Elongation in 200 mm, min (%)
Class 2585 to 76041518-
Values as printed; elongation adjustments per A20/A20M. Available only as Class 2.
Source: ASTM A387/A387M:2011, Tables 2 and 3
Heat treatment heat treatment
Austenitizing
1040 to 1080 deg C (1900 to 1975 deg F)
Tempering
730 to 800 deg C (1350 to 1470 deg F)
Plates annealed, or normalized and tempered, or accelerated cooled and tempered where permitted by the purchaser.
Source: ASTM A387/A387M:2011, Section 5

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