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IS 1570 (Part 7) 12Cr9Mo10H vs ASTM A387/A387M Grade 21

Related Material — 68.8% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 7) 12Cr9Mo10H (IS 1570 (Part 7):1992) and ASTM A387/A387M Grade 21 (ASTM A387/A387M:2011) are both steel grades. Both fall under the Alloy Steel category. IS 1570 (Part 7) 12Cr9Mo10H is typically used for boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature, while ASTM A387/A387M Grade 21 is commonly used for welded boilers and pressure vessels for elevated temperature service. IS 1570 (Part 7) 12Cr9Mo10H is defined under Bureau of Indian Standards (IS), originating from India, while ASTM A387/A387M Grade 21 is defined under ASTM International, originating from United States.

As per chemical composition, IS 1570 (Part 7) 12Cr9Mo10H vs ASTM A387/A387M Grade 21 is a 82.4% match. As per mechanical properties, the match is 41.4%. Combined, this makes them a related material overall at 68.8%.

Frequently Compared With IS 1570 (Part 7) 12Cr9Mo10H:
IS 1570 (Part 7) 10Mo6H IS 1570 (Part 7) 10Cr36Mo10H GB/T 3077 12Cr2Ni4A IS 1570 (Part 7) 12Cr4Mo5H IS 1570 (Part 4) 103Cr4 IS 1570 (Part 7) 12Cr2Mo5V2H NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 10Mo6 IS 1570 (Part 4) 07Cr4Mo6
Match Breakdown
CHEMISTRY MATCH
82.4%
MECHANICAL MATCH
41.4%
OVERALL
68.8%
Specifications
Property IS 1570 (Part 7) 12Cr9Mo10H ASTM A387/A387M Grade 21
Standard IS 1570 (Part 7):1992 ASTM A387/A387M:2011
Category Alloy Steel Alloy Steel
C (%) 0.08-0.15 0.05-0.15
Si (%) 0.10-0.50 <=0.50
Mn (%) 0.30-0.70 0.30-0.60
P (%) <=0.040 <=0.025
S (%) <=0.040 <=0.025
Cr (%) 1.90-2.60 2.75-3.25
Mo (%) 0.90-1.15 0.90-1.10
Al (metallic) (%) <=0.02 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property IS 1570 (Part 7) 12Cr9Mo10H ASTM A387/A387M Grade 21
Tensile Strength 410-560 MPa 415-585 MPa
Yield Strength >=135 MPa (0.2 % proof stress) >=205 MPa
Condition Pipes, A, thickness - (first row of Table 3) Class 1 plates, no thickness ranges printed; elongation in 50 mm gauge length
Elongation Not specified >=18%
Typical Applications
IS 1570 (Part 7) 12Cr9Mo10H
Boilers, pressure vessels, steam turbines, steam and water piping and other power plant equipment working at elevated temperature
ASTM A387/A387M Grade 21
Welded boilers and pressure vessels for elevated temperature service
Key Differences
Can IS 1570 (Part 7) 12Cr9Mo10H Be Substituted With ASTM A387/A387M Grade 21?
IS 1570 (Part 7) 12Cr9Mo10H 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.
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IS 1570 (Part 7) 12Cr9Mo10H
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ASTM A387/A387M Grade 21
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Frequently Asked Questions
What is the difference between IS 1570 (Part 7) 12Cr9Mo10H and ASTM A387/A387M Grade 21?
IS 1570 (Part 7) 12Cr9Mo10H specifies Al (metallic) which is not specified for ASTM A387/A387M Grade 21.
Can IS 1570 (Part 7) 12Cr9Mo10H be substituted with ASTM A387/A387M Grade 21?
IS 1570 (Part 7) 12Cr9Mo10H 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.