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ASTM A387/A387M Grade 21L vs ASTM A387/A387M Grade 22

Strong Match — 90.5% match based on chemical composition and mechanical property overlap.

ASTM A387/A387M Grade 21L (ASTM A387/A387M:2011) and ASTM A387/A387M Grade 22 (ASTM A387/A387M:2011) 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 ASTM A387/A387M Grade 22 is commonly used for welded boilers and pressure vessels for elevated temperature service. ASTM A387/A387M Grade 21L is defined under ASTM International, originating from United States, while ASTM A387/A387M Grade 22 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A387/A387M Grade 21L vs ASTM A387/A387M Grade 22 is a 85.7% match. As per mechanical properties, the match is 100%. Combined, this makes them a strong match overall at 90.5%.

Frequently Compared With ASTM A387/A387M Grade 21L:
EN 10028-2 10CrMo9-10 IS 1570 (Part 7) 10Mo6H IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 4) 10Mo6 UNI 11234 100Cr6
Match Breakdown
CHEMISTRY MATCH
85.7%
MECHANICAL MATCH
100%
OVERALL
90.5%
Specifications
Property ASTM A387/A387M Grade 21L ASTM A387/A387M Grade 22
Standard ASTM A387/A387M:2011 ASTM A387/A387M:2011
Category Alloy Steel Alloy Steel
C (%) <=0.10 0.05-0.15
Mn (%) 0.30-0.60 0.30-0.60
P (%) <=0.025 <=0.025
S (%) <=0.025 <=0.025
Si (%) <=0.50 <=0.50
Cr (%) 2.75-3.25 2.00-2.50
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 ASTM A387/A387M Grade 21L ASTM A387/A387M Grade 22
Tensile Strength 415-585 MPa 415-585 MPa
Yield Strength >=205 MPa >=205 MPa
Elongation >=18% >=18%
Condition Class 1 plates, no thickness ranges printed; elongation in 50 mm gauge length Class 1 plates, no thickness ranges printed; elongation in 50 mm gauge length
Typical Applications
ASTM A387/A387M Grade 21L
Welded boilers and pressure vessels for elevated temperature service
ASTM A387/A387M Grade 22
Welded boilers and pressure vessels for elevated temperature service
Can ASTM A387/A387M Grade 21L Be Substituted With ASTM A387/A387M Grade 22?
ASTM A387/A387M Grade 21L and ASTM A387/A387M Grade 22 overlap closely enough on chemistry and mechanical properties that ASTM A387/A387M Grade 22 is often considered as a substitute for ASTM A387/A387M Grade 21L in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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ASTM A387/A387M Grade 21L
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ASTM A387/A387M Grade 22
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Frequently Asked Questions
What is the difference between ASTM A387/A387M Grade 21L and ASTM A387/A387M Grade 22?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A387/A387M Grade 21L be substituted with ASTM A387/A387M Grade 22?
ASTM A387/A387M Grade 21L and ASTM A387/A387M Grade 22 overlap closely enough on chemistry and mechanical properties that ASTM A387/A387M Grade 22 is often considered as a substitute for ASTM A387/A387M Grade 21L in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.