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EN ISO 4957 X40CrMoV5-1 vs GB/T 1299 4Cr5MoSiV

Strong Match — 90.5% match based on chemical composition and mechanical property overlap.

EN ISO 4957 X40CrMoV5-1 (EN ISO 4957:2018) and GB/T 1299 4Cr5MoSiV (GB/T 1299-2014) are both steel grades. Both fall under the Tool & Die Steels category. EN ISO 4957 X40CrMoV5-1 is typically used for die casting dies, extrusion dies, forging dies, hot shear blades, while GB/T 1299 4Cr5MoSiV is commonly used for die casting dies, extrusion tooling. EN ISO 4957 X40CrMoV5-1 is defined under European Standard (EN), originating from Europe, while GB/T 1299 4Cr5MoSiV is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, EN ISO 4957 X40CrMoV5-1 vs GB/T 1299 4Cr5MoSiV is a 85.8% match. As per mechanical properties, the match is 100%. Combined, this makes them a strong match overall at 90.5%.

Frequently Compared With EN ISO 4957 X40CrMoV5-1:
GB/T 1299 4Cr5MoSiV1 DIN EN ISO 4957 1.2344 EN ISO 683-17 100Cr6 GOST 5950 4H5MFS1 EN ISO 4957 1.2316 DIN EN ISO 4957 1.2379 GB/T 1299 3Cr2W8V GOST 5950 3H2W8F GOST 5950 4H5MFS AISI 52100 IS 1570 (Part 6) 103T3
Other Tool & Die Steels Grades to Compare With EN ISO 4957 X40CrMoV5-1:
IS 3748 103T3
Match Breakdown
CHEMISTRY MATCH
85.8%
MECHANICAL MATCH
100%
OVERALL
90.5%
Specifications
Property EN ISO 4957 X40CrMoV5-1 GB/T 1299 4Cr5MoSiV
Standard EN ISO 4957:2018 GB/T 1299-2014
Category Tool & Die Steels Tool & Die Steels
C (%) 0.35–0.42 0.32–0.45
Si (%) 0.80–1.20 0.80–1.20
Mn (%) 0.30–0.50 0.20–0.50
Cr (%) 4.75–5.50 4.75–5.50
Mo (%) 1.20–1.50 1.10–1.60
V (%) 0.85–1.15 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 EN ISO 4957 X40CrMoV5-1 GB/T 1299 4Cr5MoSiV
Hardness HRC (hardened) 42–54 40–54
Hardness HB (annealed) ≤235 ≤235
Hot Strength Excellent to 600°C Not specified
Typical Applications
EN ISO 4957 X40CrMoV5-1
Die casting dies, extrusion dies, forging dies, hot shear blades
GB/T 1299 4Cr5MoSiV
Die casting dies, extrusion tooling
Can EN ISO 4957 X40CrMoV5-1 Be Substituted With GB/T 1299 4Cr5MoSiV?
EN ISO 4957 X40CrMoV5-1 and GB/T 1299 4Cr5MoSiV overlap closely enough on chemistry and mechanical properties that GB/T 1299 4Cr5MoSiV is often considered as a substitute for EN ISO 4957 X40CrMoV5-1 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
EN ISO 4957 X40CrMoV5-1
Round Bar → (3 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 2600–4800 mm (102.36–188.98 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
EN ISO 4957 X40CrMoV5-1
3 active listings and RFQs →
GB/T 1299 4Cr5MoSiV
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between EN ISO 4957 X40CrMoV5-1 and GB/T 1299 4Cr5MoSiV?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can EN ISO 4957 X40CrMoV5-1 be substituted with GB/T 1299 4Cr5MoSiV?
EN ISO 4957 X40CrMoV5-1 and GB/T 1299 4Cr5MoSiV overlap closely enough on chemistry and mechanical properties that GB/T 1299 4Cr5MoSiV is often considered as a substitute for EN ISO 4957 X40CrMoV5-1 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.