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

Related Material — 68.4% match based on chemical composition and mechanical property overlap.

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

As per chemical composition, EN 10028-2 10CrMo9-10 vs ASTM A387/A387M Grade 21 is a 77.7% match. As per mechanical properties, the match is 49.6%. Combined, this makes them a related material overall at 68.4%.

Frequently Compared With EN 10028-2 10CrMo9-10:
EN 10028-2 12CrMo9-10 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Cr20Mo6 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 7) 10Mo6H IS 1570 (Part 4) 105Cr5 IS 4367 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
77.7%
MECHANICAL MATCH
49.6%
OVERALL
68.4%
Specifications
Property EN 10028-2 10CrMo9-10 ASTM A387/A387M Grade 21
Standard EN 10028-2:2017 ASTM A387/A387M:2011
Category Alloy Steel Alloy Steel
C (%) 0.08-0.14 0.05-0.15
Si (%) <=0.50 <=0.50
Mn (%) 0.40-0.80 0.30-0.60
P (%) <=0.020 <=0.025
S (%) <=0.010 <=0.025
N (%) <=0.012 Not specified
Cr (%) 2.00-2.50 2.75-3.25
Cu (%) <=0.30 Not specified
Mo (%) 0.90-1.10 0.90-1.10
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 10CrMo9-10 ASTM A387/A387M Grade 21
Tensile Strength 480-630 MPa 415-585 MPa
Yield Strength >=310 MPa >=205 MPa
Elongation >=18% >=18%
Condition Usual delivery condition normalized and tempered (+NT), nominal thickness up to 16 mm; transverse direction, Yield Strength is ReH, Elongation is A Class 1 plates, no thickness ranges printed; elongation in 50 mm gauge length
Typical Applications
EN 10028-2 10CrMo9-10
Flat products for pressure purposes
ASTM A387/A387M Grade 21
Welded boilers and pressure vessels for elevated temperature service
Key Differences
Can EN 10028-2 10CrMo9-10 Be Substituted With ASTM A387/A387M Grade 21?
EN 10028-2 10CrMo9-10 and ASTM A387/A387M Grade 21 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.
On M-EX Right Now
EN 10028-2 10CrMo9-10
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ASTM A387/A387M Grade 21
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Frequently Asked Questions
What is the difference between EN 10028-2 10CrMo9-10 and ASTM A387/A387M Grade 21?
EN 10028-2 10CrMo9-10 specifies N, Cu which are not specified for ASTM A387/A387M Grade 21.
Can EN 10028-2 10CrMo9-10 be substituted with ASTM A387/A387M Grade 21?
EN 10028-2 10CrMo9-10 and ASTM A387/A387M Grade 21 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.