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ASTM A387/A387M Grade 12 vs IS 1570 (Part 7) 12Cr4Mo5H

Close Alternative — 74.1% match based on chemical composition and mechanical property overlap.

ASTM A387/A387M Grade 12 (ASTM A387/A387M:2011) and IS 1570 (Part 7) 12Cr4Mo5H (IS 1570 (Part 7):1992) 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 IS 1570 (Part 7) 12Cr4Mo5H is commonly used for boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature. ASTM A387/A387M Grade 12 is defined under ASTM International, originating from United States, while IS 1570 (Part 7) 12Cr4Mo5H is defined under Bureau of Indian Standards (IS), originating from India.

As per chemical composition, ASTM A387/A387M Grade 12 vs IS 1570 (Part 7) 12Cr4Mo5H is a 85.7% match. As per mechanical properties, the match is 50.8%. Combined, this makes them a close alternative overall at 74.1%.

Frequently Compared With ASTM A387/A387M Grade 12:
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 IS 1570 (Part 4) 10Mo6
Match Breakdown
CHEMISTRY MATCH
85.7%
MECHANICAL MATCH
50.8%
OVERALL
74.1%
Specifications
Property ASTM A387/A387M Grade 12 IS 1570 (Part 7) 12Cr4Mo5H
Standard ASTM A387/A387M:2011 IS 1570 (Part 7):1992
Category Alloy Steel Alloy Steel
C (%) 0.05-0.17 0.10-0.18
Mn (%) 0.40-0.65 0.40-0.70
P (%) <=0.025 <=0.040
S (%) <=0.025 Not specified
Si (%) 0.15-0.40 0.10-0.35
Cr (%) 0.80-1.15 0.70-1.10
Mo (%) 0.45-0.60 0.45-0.65
Al (metallic) (%) Not specified <=0.02
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 IS 1570 (Part 7) 12Cr4Mo5H
Tensile Strength 380-550 MPa 440-590 MPa
Yield Strength >=230 MPa >=275 MPa (0.2 % proof stress)
Elongation >=22% >=22%
Condition Class 1 plates, no thickness ranges printed; elongation in 50 mm gauge length Pipes, N+T, thickness - (first row of Table 3)
Typical Applications
ASTM A387/A387M Grade 12
Welded boilers and pressure vessels for elevated temperature service
IS 1570 (Part 7) 12Cr4Mo5H
Boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature
Key Differences
Can ASTM A387/A387M Grade 12 Be Substituted With IS 1570 (Part 7) 12Cr4Mo5H?
ASTM A387/A387M Grade 12 and IS 1570 (Part 7) 12Cr4Mo5H 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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IS 1570 (Part 7) 12Cr4Mo5H
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Frequently Asked Questions
What is the difference between ASTM A387/A387M Grade 12 and IS 1570 (Part 7) 12Cr4Mo5H?
ASTM A387/A387M Grade 12 specifies S which is not specified for IS 1570 (Part 7) 12Cr4Mo5H. IS 1570 (Part 7) 12Cr4Mo5H specifies Al (metallic) which is not specified for ASTM A387/A387M Grade 12.
Can ASTM A387/A387M Grade 12 be substituted with IS 1570 (Part 7) 12Cr4Mo5H?
ASTM A387/A387M Grade 12 and IS 1570 (Part 7) 12Cr4Mo5H 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.