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JIS G4404 SKS31 vs GOST 5950 4H5MFS1

Minimal Match — 32.8% match based on chemical composition and mechanical property overlap.

JIS G4404 SKS31 (JIS G4404:2006) and GOST 5950 4H5MFS1 (GOST 5950-2000) are both steel grades. Both fall under the Tool & Die Steels category. JIS G4404 SKS31 is typically used for cold working molds, press dies, jigs, gauges, long taps, reamers, measuring tools requiring minimal quenching distortion., while GOST 5950 4H5MFS1 is commonly used for used for forging dies, pressure casting dies, hot punches, extrusion tooling, and die inserts.. JIS G4404 SKS31 is defined under Japanese Industrial Standards (JIS) (Japan).

As per chemical composition, JIS G4404 SKS31 vs GOST 5950 4H5MFS1 is a 49.2% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 32.8%.

Frequently Compared With JIS G4404 SKS31:
EN ISO 4957 1.2316 DIN EN ISO 4957 1.2344 DIN EN ISO 4957 1.2379 GB/T 1299 4Cr5MoSiV EN ISO 683-17 100Cr6 AISI 52100 GB/T 1299 4Cr5MoSiV1 GB/T 1299 3Cr2W8V GOST 5950 3H2W8F GOST 5950 4H5MFS IS 3748 103T3 IS 1570 (Part 6) 103T3
Match Breakdown
CHEMISTRY MATCH
49.2%
MECHANICAL MATCH
0%
OVERALL
32.8%
Specifications
Property JIS G4404 SKS31 GOST 5950 4H5MFS1
Standard JIS G4404:2006 GOST 5950-2000
Category Tool & Die Steels Tool & Die Steels
C (%) 0.95-1.05 0.35-0.45
Si (%) <=0.35 0.8-1.2
Mn (%) 0.90-1.20 Not specified
P (%) <=0.03 Not specified
S (%) <=0.03 Not specified
Cr (%) 0.80-1.20 4.5-5.5
W (%) 1.00-1.50 Not specified
Mo (%) Not specified 1.2-1.6
V (%) Not specified 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 SKS31 GOST 5950 4H5MFS1
Tensile Strength 900-1150 MPa 1350-1650 MPa
Yield Strength 750 MPa min 1150 MPa min
Elongation 10% min 9% min
Hardness 58-62 HRC 44-50 HRC
Typical Applications
JIS G4404 SKS31
Cold working molds, press dies, jigs, gauges, long taps, reamers, measuring tools requiring minimal quenching distortion.
GOST 5950 4H5MFS1
Used for forging dies, pressure casting dies, hot punches, extrusion tooling, and die inserts.
Key Differences
Can JIS G4404 SKS31 Be Substituted With GOST 5950 4H5MFS1?
JIS G4404 SKS31 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 SKS31
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 2500–3700 mm (98.43–145.67 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 SKS31
2 active listings and RFQs →
GOST 5950 4H5MFS1
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4404 SKS31 and GOST 5950 4H5MFS1?
JIS G4404 SKS31 specifies Mn, P, S, W which are not specified for GOST 5950 4H5MFS1. GOST 5950 4H5MFS1 specifies Mo, V which are not specified for JIS G4404 SKS31.
Can JIS G4404 SKS31 be substituted with GOST 5950 4H5MFS1?
JIS G4404 SKS31 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.