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JIS G4404 SKS31 vs GB/T 1299 4Cr5MoSiV

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

JIS G4404 SKS31 (JIS G4404:2006) and GB/T 1299 4Cr5MoSiV (GB/T 1299-2014) 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 GB/T 1299 4Cr5MoSiV is commonly used for die casting dies, extrusion tooling. JIS G4404 SKS31 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 G4404 SKS31 vs GB/T 1299 4Cr5MoSiV 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 EN ISO 683-17 100Cr6 AISI 52100 GB/T 1299 4Cr5MoSiV1 GOST 5950 4H5MFS1 GB/T 1299 3Cr2W8V GOST 5950 3H2W8F GOST 5950 4H5MFS IS 3748 103T3
Other Tool & Die Steels Grades to Compare With JIS G4404 SKS31:
IS 1570 (Part 6) 103T3
Match Breakdown
CHEMISTRY MATCH
49.2%
MECHANICAL MATCH
0%
OVERALL
32.8%
Specifications
Property JIS G4404 SKS31 GB/T 1299 4Cr5MoSiV
Standard JIS G4404:2006 GB/T 1299-2014
Category Tool & Die Steels Tool & Die Steels
C (%) 0.95-1.05 0.32–0.45
Si (%) <=0.35 0.80–1.20
Mn (%) 0.90-1.20 0.20–0.50
P (%) <=0.03 Not specified
S (%) <=0.03 Not specified
Cr (%) 0.80-1.20 4.75–5.50
W (%) 1.00-1.50 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 G4404 SKS31 GB/T 1299 4Cr5MoSiV
Tensile Strength 900-1150 MPa Not specified
Yield Strength 750 MPa min Not specified
Elongation 10% min Not specified
Hardness 58-62 HRC Not specified
Hardness HRC (hardened) Not specified 40–54
Hardness HB (annealed) Not specified ≤235
Typical Applications
JIS G4404 SKS31
Cold working molds, press dies, jigs, gauges, long taps, reamers, measuring tools requiring minimal quenching distortion.
GB/T 1299 4Cr5MoSiV
Die casting dies, extrusion tooling
Key Differences
Can JIS G4404 SKS31 Be Substituted With GB/T 1299 4Cr5MoSiV?
JIS G4404 SKS31 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 G4404 SKS31
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 2500–3700 mm (98.43–145.67 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 G4404 SKS31
2 active listings and RFQs →
GB/T 1299 4Cr5MoSiV
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between JIS G4404 SKS31 and GB/T 1299 4Cr5MoSiV?
JIS G4404 SKS31 specifies P, S, W which are not specified for GB/T 1299 4Cr5MoSiV. GB/T 1299 4Cr5MoSiV specifies Mo, V which are not specified for JIS G4404 SKS31.
Can JIS G4404 SKS31 be substituted with GB/T 1299 4Cr5MoSiV?
JIS G4404 SKS31 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.