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ASTM A387/A387M Grade 21L vs UNI 11234 100Cr6

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

ASTM A387/A387M Grade 21L (ASTM A387/A387M:2011) and UNI 11234 100Cr6 (UNI 11234:2007) 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 UNI 11234 100Cr6 is commonly used for ball bearings,roller bearings,needle bearings,dies,punches,gauges,wear resistant components. ASTM A387/A387M Grade 21L is defined under ASTM International, originating from United States, while UNI 11234 100Cr6 is defined under Ente Nazionale Italiano di Unificazione (UNI), originating from Italy.

As per chemical composition, ASTM A387/A387M Grade 21L vs UNI 11234 100Cr6 is a 67.6% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With ASTM A387/A387M Grade 21L:
EN 10028-2 10CrMo9-10 IS 1570 (Part 7) 10Mo6H IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Mo6 IS 4367 07Cr4Mo6 IS 1570 (Part 4) 07Cr4Mo6 NF A35-565 100C6 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 10Cr20Mo6 IS 4367 10Cr9Mo10 IS 1570 (Part 7) 10Cr36Mo10H
Match Breakdown
CHEMISTRY MATCH
67.6%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property ASTM A387/A387M Grade 21L UNI 11234 100Cr6
Standard ASTM A387/A387M:2011 UNI 11234:2007
Category Alloy Steel Alloy Steel
C (%) <=0.10 0.93-1.05
Mn (%) 0.30-0.60 0.25-0.45
P (%) <=0.025 <=0.025
S (%) <=0.025 <=0.025
Si (%) <=0.50 0.15-0.35
Cr (%) 2.75-3.25 1.35-1.65
Mo (%) 0.90-1.10 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 ASTM A387/A387M Grade 21L UNI 11234 100Cr6
Tensile Strength 415-585 MPa 750-1000 MPa
Yield Strength >=205 MPa 400-600 MPa
Elongation >=18% 10-14 %
Condition Class 1 plates, no thickness ranges printed; elongation in 50 mm gauge length Not specified
Hardness Not specified 60-64 HRC
Typical Applications
ASTM A387/A387M Grade 21L
Welded boilers and pressure vessels for elevated temperature service
UNI 11234 100Cr6
ball bearings,roller bearings,needle bearings,dies,punches,gauges,wear resistant components
Key Differences
Can ASTM A387/A387M Grade 21L Be Substituted With UNI 11234 100Cr6?
ASTM A387/A387M Grade 21L and UNI 11234 100Cr6 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.
Forms & Sizes Available on M-EX
ASTM A387/A387M Grade 21L
No active listings currently.
UNI 11234 100Cr6
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5700–6800 mm (224.41–267.72 in)
On M-EX Right Now
ASTM A387/A387M Grade 21L
0 active listings and RFQs →
UNI 11234 100Cr6
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A387/A387M Grade 21L and UNI 11234 100Cr6?
ASTM A387/A387M Grade 21L specifies Mo which is not specified for UNI 11234 100Cr6.
Can ASTM A387/A387M Grade 21L be substituted with UNI 11234 100Cr6?
ASTM A387/A387M Grade 21L and UNI 11234 100Cr6 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.