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ASTM A681 S7 vs JIS G4404 SKD61

Close Alternative — 74.9% match based on chemical composition and mechanical property overlap.

ASTM A681 S7 (ASTM A681:2008) and JIS G4404 SKD61 (JIS G4404:2006) are both steel grades. Both fall under the Tool & Die Steels category. ASTM A681 S7 is typically used for tools, dies and fixtures (clause 1.2), while JIS G4404 SKD61 is commonly used for die casting dies, extrusion tooling, forging tools. ASTM A681 S7 is defined under ASTM International, originating from United States, while JIS G4404 SKD61 is defined under Japanese Industrial Standards (JIS), originating from Japan.

As per chemical composition, ASTM A681 S7 vs JIS G4404 SKD61 is a 62.3% match. As per mechanical properties, the match is 100%. Combined, this makes them a close alternative overall at 74.9%.

Frequently Compared With ASTM A681 S7:
DIN EN ISO 4957 1.2344 IS 1570 (Part 6) 133T3 GB/T 1299 4Cr5MoSiV1 EN ISO 4957 1.2316 GB/T 1299 3Cr2W8V GB/T 1299 4Cr5MoSiV GOST 5950 4H5MFS1 DIN EN ISO 4957 1.2379 EN ISO 683-17 100Cr6 IS 1570 (Part 6) 118T3 GOST 5950 3H2W8F GOST 5950 4H5MFS
Match Breakdown
CHEMISTRY MATCH
62.3%
MECHANICAL MATCH
100%
OVERALL
74.9%
Specifications
Property ASTM A681 S7 JIS G4404 SKD61
Standard ASTM A681:2008 JIS G4404:2006
Category Tool & Die Steels Tool & Die Steels
C (%) 0.45-0.55 0.32-0.42
Mn (%) 0.20-0.90 0.25-0.50
P (%) <=0.030 Not specified
S (%) <=0.030 Not specified
Si (%) 0.20-1.00 0.80-1.20
Cr (%) 3.00-3.50 4.50-5.50
V (%) <=0.35 0.80-1.20
Mo (%) 1.30-1.80 1.00-1.50
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 S7 JIS G4404 SKD61
Hardness <=229 HB Not specified
Condition Annealed (maximum Brinell hardness) Not specified
Hardness HRC (hardened) Not specified 44-54
Hardness HB (annealed) Not specified <=229
Typical Applications
ASTM A681 S7
Tools, dies and fixtures (clause 1.2)
JIS G4404 SKD61
Die casting dies, extrusion tooling, forging tools
Key Differences
Can ASTM A681 S7 Be Substituted With JIS G4404 SKD61?
ASTM A681 S7 and JIS G4404 SKD61 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 S7
No active listings currently.
JIS G4404 SKD61
Round Bar → (3 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 2500–4200 mm (98.43–165.35 in)
On M-EX Right Now
ASTM A681 S7
0 active listings and RFQs →
JIS G4404 SKD61
3 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A681 S7 and JIS G4404 SKD61?
ASTM A681 S7 specifies P, S which are not specified for JIS G4404 SKD61.
Can ASTM A681 S7 be substituted with JIS G4404 SKD61?
ASTM A681 S7 and JIS G4404 SKD61 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.