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ASTM A387/A387M Grade 11 vs ASTM A387/A387M Grade 12

Close Alternative — 75.4% match based on chemical composition and mechanical property overlap.

ASTM A387/A387M Grade 11 (ASTM A387/A387M:2011) and ASTM A387/A387M Grade 12 (ASTM A387/A387M:2011) are both steel grades. Both fall under the Alloy Steel category. ASTM A387/A387M Grade 11 is typically used for welded boilers and pressure vessels for elevated temperature service, while ASTM A387/A387M Grade 12 is commonly used for welded boilers and pressure vessels for elevated temperature service. ASTM A387/A387M Grade 11 is defined under ASTM International, originating from United States, while ASTM A387/A387M Grade 12 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A387/A387M Grade 11 vs ASTM A387/A387M Grade 12 is a 85.4% match. As per mechanical properties, the match is 55.3%. Combined, this makes them a close alternative overall at 75.4%.

Frequently Compared With ASTM A387/A387M Grade 11:
IS 1570 (Part 7) 12Cr4Mo5H NF A35-565 100C6 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 4367 07Cr4Mo6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H EN 10028-2 10CrMo9-10
Match Breakdown
CHEMISTRY MATCH
85.4%
MECHANICAL MATCH
55.3%
OVERALL
75.4%
Specifications
Property ASTM A387/A387M Grade 11 ASTM A387/A387M Grade 12
Standard ASTM A387/A387M:2011 ASTM A387/A387M:2011
Category Alloy Steel Alloy Steel
C (%) 0.05-0.17 0.05-0.17
Mn (%) 0.40-0.65 0.40-0.65
P (%) <=0.025 <=0.025
S (%) <=0.025 <=0.025
Si (%) 0.50-0.80 0.15-0.40
Cr (%) 1.00-1.50 0.80-1.15
Mo (%) 0.45-0.65 0.45-0.60
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 11 ASTM A387/A387M Grade 12
Tensile Strength 415-585 MPa 380-550 MPa
Yield Strength >=240 MPa >=230 MPa
Elongation >=22% >=22%
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 11
Welded boilers and pressure vessels for elevated temperature service
ASTM A387/A387M Grade 12
Welded boilers and pressure vessels for elevated temperature service
Can ASTM A387/A387M Grade 11 Be Substituted With ASTM A387/A387M Grade 12?
ASTM A387/A387M Grade 11 and ASTM A387/A387M Grade 12 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.
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ASTM A387/A387M Grade 11
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Frequently Asked Questions
What is the difference between ASTM A387/A387M Grade 11 and ASTM A387/A387M Grade 12?
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 11 be substituted with ASTM A387/A387M Grade 12?
ASTM A387/A387M Grade 11 and ASTM A387/A387M Grade 12 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.