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

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

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

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