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JIS G4404 SKD61 vs GOST 5950 4H5MFS1

Minimal Match — 54.3% match based on chemical composition and mechanical property overlap.

JIS G4404 SKD61 (JIS G4404:2006) and GOST 5950 4H5MFS1 (GOST 5950-2000) are both steel grades. Both fall under the Tool & Die Steels category. JIS G4404 SKD61 is typically used for die casting dies, extrusion tooling, forging tools, while GOST 5950 4H5MFS1 is commonly used for used for forging dies, pressure casting dies, hot punches, extrusion tooling, and die inserts.. JIS G4404 SKD61 is defined under Japanese Industrial Standards (JIS) (Japan).

As per chemical composition, JIS G4404 SKD61 vs GOST 5950 4H5MFS1 is a 81.4% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 54.3%.

Frequently Compared With JIS G4404 SKD61:
DIN EN ISO 4957 1.2344 EN ISO 683-17 100Cr6 GB/T 1299 4Cr5MoSiV1 GOST 5950 4H5MFS EN ISO 4957 1.2316 AISI 52100 GB/T 1299 3Cr2W8V GOST 5950 3H2W8F GB/T 1299 4Cr5MoSiV DIN EN ISO 4957 1.2379 IS 3748 103T3 IS 1570 (Part 6) 103T3
Match Breakdown
CHEMISTRY MATCH
81.4%
MECHANICAL MATCH
0%
OVERALL
54.3%
Specifications
Property JIS G4404 SKD61 GOST 5950 4H5MFS1
Standard JIS G4404:2006 GOST 5950-2000
Category Tool & Die Steels Tool & Die Steels
C (%) 0.32-0.42 0.35-0.45
Si (%) 0.80-1.20 0.8-1.2
Mn (%) 0.25-0.50 Not specified
Cr (%) 4.50-5.50 4.5-5.5
Mo (%) 1.00-1.50 1.2-1.6
V (%) 0.80-1.20 0.3-0.6
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 SKD61 GOST 5950 4H5MFS1
Hardness HRC (hardened) 44-54 Not specified
Hardness HB (annealed) <=229 Not specified
Tensile Strength Not specified 1350-1650 MPa
Yield Strength Not specified 1150 MPa min
Elongation Not specified 9% min
Hardness Not specified 44-50 HRC
Typical Applications
JIS G4404 SKD61
Die casting dies, extrusion tooling, forging tools
GOST 5950 4H5MFS1
Used for forging dies, pressure casting dies, hot punches, extrusion tooling, and die inserts.
Key Differences
Can JIS G4404 SKD61 Be Substituted With GOST 5950 4H5MFS1?
JIS G4404 SKD61 and GOST 5950 4H5MFS1 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
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)
GOST 5950 4H5MFS1
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 3000–3100 mm (118.11–122.05 in)
On M-EX Right Now
JIS G4404 SKD61
3 active listings and RFQs →
GOST 5950 4H5MFS1
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4404 SKD61 and GOST 5950 4H5MFS1?
JIS G4404 SKD61 specifies Mn which is not specified for GOST 5950 4H5MFS1.
Can JIS G4404 SKD61 be substituted with GOST 5950 4H5MFS1?
JIS G4404 SKD61 and GOST 5950 4H5MFS1 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.