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JIS G4805 SUJ2 vs GOST 5950 4H5MFS1

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

JIS G4805 SUJ2 (JIS G 4805:1999) and GOST 5950 4H5MFS1 (GOST 5950-2000) are both steel grades. Both fall under the Tool & Die Steels category. JIS G4805 SUJ2 is typically used for ball bearings, roller bearings, bearing races, precision rolls, while GOST 5950 4H5MFS1 is commonly used for used for forging dies, pressure casting dies, hot punches, extrusion tooling, and die inserts.. JIS G4805 SUJ2 is defined under Japanese Industrial Standards (JIS) (Japan).

As per chemical composition, JIS G4805 SUJ2 vs GOST 5950 4H5MFS1 is a 64.9% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With JIS G4805 SUJ2:
EN ISO 683-17 100Cr6 AISI 52100 GB/T 1299 4Cr5MoSiV1 EN ISO 4957 1.2316 GOST 5950 3H2W8F GB/T 1299 4Cr5MoSiV GOST 5950 4H5MFS DIN EN ISO 4957 1.2344 DIN EN ISO 4957 1.2379 GB/T 1299 3Cr2W8V IS 1570 (Part 6) 103T3
Other Tool & Die Steels Grades to Compare With JIS G4805 SUJ2:
IS 3748 103T3
Match Breakdown
CHEMISTRY MATCH
64.9%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property JIS G4805 SUJ2 GOST 5950 4H5MFS1
Standard JIS G 4805:1999 GOST 5950-2000
Category Tool & Die Steels Tool & Die Steels
C (%) 0.95–1.10 0.35-0.45
Si (%) 0.15–0.35 0.8-1.2
Mn (%) ≤0.50 Not specified
Cr (%) 1.30–1.60 4.5-5.5
S (%) ≤0.025 Not specified
P (%) ≤0.025 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 G4805 SUJ2 GOST 5950 4H5MFS1
Tensile Strength ≥650 MPa (annealed) 1350-1650 MPa
Hardness HRC 60–64 (hardened) Not specified
Hardness HB 183–229 (annealed) Not specified
Yield Strength Not specified 1150 MPa min
Elongation Not specified 9% min
Hardness Not specified 44-50 HRC
Typical Applications
JIS G4805 SUJ2
Ball bearings, roller bearings, bearing races, precision rolls
GOST 5950 4H5MFS1
Used for forging dies, pressure casting dies, hot punches, extrusion tooling, and die inserts.
Key Differences
Can JIS G4805 SUJ2 Be Substituted With GOST 5950 4H5MFS1?
JIS G4805 SUJ2 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 G4805 SUJ2
Round Bar → (6 listings)
Diameter: 60–80 mm (2.36–3.15 in)
Length: 5000–6900 mm (196.85–271.65 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 G4805 SUJ2
6 active listings and RFQs →
GOST 5950 4H5MFS1
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4805 SUJ2 and GOST 5950 4H5MFS1?
JIS G4805 SUJ2 specifies Mn, S, P which are not specified for GOST 5950 4H5MFS1. GOST 5950 4H5MFS1 specifies Mo, V which are not specified for JIS G4805 SUJ2.
Can JIS G4805 SUJ2 be substituted with GOST 5950 4H5MFS1?
JIS G4805 SUJ2 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.