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ASTM A681 H21 vs ASTM A681 H25

Close Alternative — 83.9% match based on chemical composition and mechanical property overlap.

ASTM A681 H21 (ASTM A681:2008) and ASTM A681 H25 (ASTM A681:2008) are both steel grades. Both fall under the Tool & Die Steels category. ASTM A681 H21 is typically used for hot extrusion dies, hot forging dies for brass/bronze, while ASTM A681 H25 is commonly used for tools, dies and fixtures (clause 1.2). ASTM A681 H21 is defined under ASTM International, originating from United States, while ASTM A681 H25 is defined under ASTM International, originating from United States.

As per chemical composition, ASTM A681 H21 vs ASTM A681 H25 is a 75.8% match. As per mechanical properties, the match is 100%. Combined, this makes them a close alternative overall at 83.9%.

Frequently Compared With ASTM A681 H21:
EN ISO 683-17 100Cr6 EN ISO 4957 1.2316 GB/T 1299 4Cr5MoSiV GB/T 1299 4Cr5MoSiV1 AISI 52100 DIN EN ISO 4957 1.2344 DIN EN ISO 4957 1.2379 GB/T 1299 3Cr2W8V GOST 5950 4H5MFS1 GOST 5950 3H2W8F GOST 5950 4H5MFS IS 1570 (Part 6) 103T3
Match Breakdown
CHEMISTRY MATCH
75.8%
MECHANICAL MATCH
100%
OVERALL
83.9%
Specifications
Property ASTM A681 H21 ASTM A681 H25
Standard ASTM A681:2008 ASTM A681:2008
Category Tool & Die Steels Tool & Die Steels
C (%) 0.26-0.36 0.22-0.32
Mn (%) 0.15-0.40 0.15-0.40
P (%) <=0.030 <=0.030
S (%) <=0.030 <=0.030
Si (%) 0.15-0.50 0.15-0.40
Cr (%) 3.00-3.75 3.75-4.50
V (%) 0.30-0.60 0.40-0.60
W (%) 8.50-10.00 14.00-16.00
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property ASTM A681 H21 ASTM A681 H25
Hardness <=235 HB <=235 HB
Condition Annealed (maximum Brinell hardness) Annealed (maximum Brinell hardness)
Typical Applications
ASTM A681 H21
Hot extrusion dies, hot forging dies for brass/bronze
ASTM A681 H25
Tools, dies and fixtures (clause 1.2)
Can ASTM A681 H21 Be Substituted With ASTM A681 H25?
ASTM A681 H21 and ASTM A681 H25 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.
Forms & Sizes Available on M-EX
ASTM A681 H21
Flat Bar → (3 listings)
Thickness: 30–30 mm (1.18–1.18 in)
Width: 150–150 mm (5.91–5.91 in)
Length: 500–900 mm (19.69–35.43 in)
ASTM A681 H25
No active listings currently.
On M-EX Right Now
ASTM A681 H21
3 active listings and RFQs →
ASTM A681 H25
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A681 H21 and ASTM A681 H25?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can ASTM A681 H21 be substituted with ASTM A681 H25?
ASTM A681 H21 and ASTM A681 H25 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.