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ASTM A387/A387M Grade 21L vs EN 10028-2 10CrMo9-10

Related Material — 65.7% match based on chemical composition and mechanical property overlap.

ASTM A387/A387M Grade 21L (ASTM A387/A387M:2011) and EN 10028-2 10CrMo9-10 (EN 10028-2:2017) are both steel grades. Both fall under the Alloy Steel category. ASTM A387/A387M Grade 21L is typically used for welded boilers and pressure vessels for elevated temperature service, while EN 10028-2 10CrMo9-10 is commonly used for flat products for pressure purposes. ASTM A387/A387M Grade 21L is defined under ASTM International, originating from United States, while EN 10028-2 10CrMo9-10 is defined under European Standard (EN), originating from Europe.

As per chemical composition, ASTM A387/A387M Grade 21L vs EN 10028-2 10CrMo9-10 is a 73.8% match. As per mechanical properties, the match is 49.6%. Combined, this makes them a related material overall at 65.7%.

Frequently Compared With ASTM A387/A387M Grade 21L:
IS 1570 (Part 7) 10Mo6H IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Mo6 IS 4367 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
73.8%
MECHANICAL MATCH
49.6%
OVERALL
65.7%
Specifications
Property ASTM A387/A387M Grade 21L EN 10028-2 10CrMo9-10
Standard ASTM A387/A387M:2011 EN 10028-2:2017
Category Alloy Steel Alloy Steel
C (%) <=0.10 0.08-0.14
Mn (%) 0.30-0.60 0.40-0.80
P (%) <=0.025 <=0.020
S (%) <=0.025 <=0.010
Si (%) <=0.50 <=0.50
Cr (%) 2.75-3.25 2.00-2.50
Mo (%) 0.90-1.10 0.90-1.10
N (%) Not specified <=0.012
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 21L EN 10028-2 10CrMo9-10
Tensile Strength 415-585 MPa 480-630 MPa
Yield Strength >=205 MPa >=310 MPa
Elongation >=18% >=18%
Condition Class 1 plates, no thickness ranges printed; elongation in 50 mm gauge length Usual delivery condition normalized and tempered (+NT), nominal thickness up to 16 mm; transverse direction, Yield Strength is ReH, Elongation is A
Typical Applications
ASTM A387/A387M Grade 21L
Welded boilers and pressure vessels for elevated temperature service
EN 10028-2 10CrMo9-10
Flat products for pressure purposes
Key Differences
Can ASTM A387/A387M Grade 21L Be Substituted With EN 10028-2 10CrMo9-10?
ASTM A387/A387M Grade 21L and EN 10028-2 10CrMo9-10 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 21L
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EN 10028-2 10CrMo9-10
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Frequently Asked Questions
What is the difference between ASTM A387/A387M Grade 21L and EN 10028-2 10CrMo9-10?
EN 10028-2 10CrMo9-10 specifies N, Cu which are not specified for ASTM A387/A387M Grade 21L.
Can ASTM A387/A387M Grade 21L be substituted with EN 10028-2 10CrMo9-10?
ASTM A387/A387M Grade 21L and EN 10028-2 10CrMo9-10 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.