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ASTM A387/A387M Grade 21L vs BS 970 (Part 1) 897M39

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

ASTM A387/A387M Grade 21L (ASTM A387/A387M:2011) and BS 970 (Part 1) 897M39 (BS 970 (Part 1):1991) 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 BS 970 (Part 1) 897M39 is commonly used for steel for surface hardening by nitriding (section three). ASTM A387/A387M Grade 21L is defined under ASTM International, originating from United States, while BS 970 (Part 1) 897M39 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, ASTM A387/A387M Grade 21L vs BS 970 (Part 1) 897M39 is a 71.3% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.9%.

Frequently Compared With ASTM A387/A387M Grade 21L:
EN 10028-2 10CrMo9-10 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 7) 10Mo6H IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Mo6 IS 4367 07Cr4Mo6 NF A35-565 100C6 UNI 11234 100Cr6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
71.3%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property ASTM A387/A387M Grade 21L BS 970 (Part 1) 897M39
Standard ASTM A387/A387M:2011 BS 970 (Part 1):1991
Category Alloy Steel Alloy Steel
C (%) <=0.10 0.35-0.43
Mn (%) 0.30-0.60 0.45-0.70
P (%) <=0.025 Not specified
S (%) <=0.025 Not specified
Si (%) <=0.50 Not specified
Cr (%) 2.75-3.25 3.00-3.50
Mo (%) 0.90-1.10 0.80-1.10
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 BS 970 (Part 1) 897M39
Tensile Strength 415-585 MPa Not specified
Yield Strength >=205 MPa Not specified
Elongation >=18% Not specified
Condition Class 1 plates, no thickness ranges printed; elongation in 50 mm gauge length Not specified
Typical Applications
ASTM A387/A387M Grade 21L
Welded boilers and pressure vessels for elevated temperature service
BS 970 (Part 1) 897M39
Steel for surface hardening by nitriding (section three)
Key Differences
Can ASTM A387/A387M Grade 21L Be Substituted With BS 970 (Part 1) 897M39?
ASTM A387/A387M Grade 21L and BS 970 (Part 1) 897M39 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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ASTM A387/A387M Grade 21L
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BS 970 (Part 1) 897M39
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Frequently Asked Questions
What is the difference between ASTM A387/A387M Grade 21L and BS 970 (Part 1) 897M39?
ASTM A387/A387M Grade 21L specifies P, S, Si which are not specified for BS 970 (Part 1) 897M39.
Can ASTM A387/A387M Grade 21L be substituted with BS 970 (Part 1) 897M39?
ASTM A387/A387M Grade 21L and BS 970 (Part 1) 897M39 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.