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JIS G4805 SUJ2 vs GB/T 1299 4Cr5MoSiV

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

JIS G4805 SUJ2 (JIS G 4805:1999) and GB/T 1299 4Cr5MoSiV (GB/T 1299-2014) 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 GB/T 1299 4Cr5MoSiV is commonly used for die casting dies, extrusion tooling. JIS G4805 SUJ2 is defined under Japanese Industrial Standards (JIS), originating from Japan, while GB/T 1299 4Cr5MoSiV is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, JIS G4805 SUJ2 vs GB/T 1299 4Cr5MoSiV is a 59.5% 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 GOST 5950 4H5MFS1 EN ISO 4957 1.2316 GB/T 1299 4Cr5MoSiV1 GOST 5950 3H2W8F DIN EN ISO 4957 1.2379 GOST 5950 4H5MFS DIN EN ISO 4957 1.2344 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
59.5%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property JIS G4805 SUJ2 GB/T 1299 4Cr5MoSiV
Standard JIS G 4805:1999 GB/T 1299-2014
Category Tool & Die Steels Tool & Die Steels
C (%) 0.95–1.10 0.32–0.45
Si (%) 0.15–0.35 0.80–1.20
Mn (%) ≤0.50 0.20–0.50
Cr (%) 1.30–1.60 4.75–5.50
S (%) ≤0.025 Not specified
P (%) ≤0.025 Not specified
Mo (%) Not specified 1.10–1.60
V (%) Not specified 0.30–0.60
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 GB/T 1299 4Cr5MoSiV
Tensile Strength ≥650 MPa (annealed) Not specified
Hardness HRC 60–64 (hardened) Not specified
Hardness HB 183–229 (annealed) Not specified
Hardness HRC (hardened) Not specified 40–54
Hardness HB (annealed) Not specified ≤235
Typical Applications
JIS G4805 SUJ2
Ball bearings, roller bearings, bearing races, precision rolls
GB/T 1299 4Cr5MoSiV
Die casting dies, extrusion tooling
Key Differences
Can JIS G4805 SUJ2 Be Substituted With GB/T 1299 4Cr5MoSiV?
JIS G4805 SUJ2 and GB/T 1299 4Cr5MoSiV 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)
GB/T 1299 4Cr5MoSiV
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 2500–2700 mm (98.43–106.3 in)
On M-EX Right Now
JIS G4805 SUJ2
6 active listings and RFQs →
GB/T 1299 4Cr5MoSiV
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4805 SUJ2 and GB/T 1299 4Cr5MoSiV?
JIS G4805 SUJ2 specifies S, P which are not specified for GB/T 1299 4Cr5MoSiV. GB/T 1299 4Cr5MoSiV specifies Mo, V which are not specified for JIS G4805 SUJ2.
Can JIS G4805 SUJ2 be substituted with GB/T 1299 4Cr5MoSiV?
JIS G4805 SUJ2 and GB/T 1299 4Cr5MoSiV 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.