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JIS G4404 SKD6 vs ASTM A681 S7

Close Alternative — 75.3% match based on chemical composition and mechanical property overlap.

JIS G4404 SKD6 (JIS G4404:2006) and ASTM A681 S7 (ASTM A681:2008) are both steel grades. Both fall under the Tool & Die Steels category. JIS G4404 SKD6 is typically used for die casting dies, hot forging tools, while ASTM A681 S7 is commonly used for tools, dies and fixtures (clause 1.2). JIS G4404 SKD6 is defined under Japanese Industrial Standards (JIS), originating from Japan, while ASTM A681 S7 is defined under ASTM International, originating from United States.

As per chemical composition, JIS G4404 SKD6 vs ASTM A681 S7 is a 62.9% match. As per mechanical properties, the match is 100%. Combined, this makes them a close alternative overall at 75.3%.

Frequently Compared With JIS G4404 SKD6:
GOST 5950 4H5MFS1 GOST 5950 4H5MFS EN ISO 683-17 100Cr6 AISI 52100 GB/T 1299 4Cr5MoSiV EN ISO 4957 1.2316 GOST 5950 3H2W8F GB/T 1299 3Cr2W8V DIN EN ISO 4957 1.2344 DIN EN ISO 4957 1.2379 GB/T 1299 4Cr5MoSiV1 IS 1570 (Part 6) 103T3
Match Breakdown
CHEMISTRY MATCH
62.9%
MECHANICAL MATCH
100%
OVERALL
75.3%
Specifications
Property JIS G4404 SKD6 ASTM A681 S7
Standard JIS G4404:2006 ASTM A681:2008
Category Tool & Die Steels Tool & Die Steels
C (%) 0.32-0.42 0.45-0.55
Si (%) 0.80-1.20 0.20-1.00
Mn (%) 0.25-0.50 0.20-0.90
Cr (%) 4.50-5.50 3.00-3.50
Mo (%) 1.00-1.50 1.30-1.80
V (%) 0.30-0.50 <=0.35
P (%) Not specified <=0.030
S (%) Not specified <=0.030
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property JIS G4404 SKD6 ASTM A681 S7
Hardness HRC (hardened) 40-52 Not specified
Hardness HB (annealed) <=229 Not specified
Hardness Not specified <=229 HB
Condition Not specified Annealed (maximum Brinell hardness)
Typical Applications
JIS G4404 SKD6
Die casting dies, hot forging tools
ASTM A681 S7
Tools, dies and fixtures (clause 1.2)
Key Differences
Can JIS G4404 SKD6 Be Substituted With ASTM A681 S7?
JIS G4404 SKD6 and ASTM A681 S7 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
JIS G4404 SKD6
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 2500–3900 mm (98.43–153.54 in)
ASTM A681 S7
No active listings currently.
On M-EX Right Now
JIS G4404 SKD6
2 active listings and RFQs →
ASTM A681 S7
0 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4404 SKD6 and ASTM A681 S7?
ASTM A681 S7 specifies P, S which are not specified for JIS G4404 SKD6.
Can JIS G4404 SKD6 be substituted with ASTM A681 S7?
JIS G4404 SKD6 and ASTM A681 S7 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.