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ASTM A681 O2 vs GB/T 1299 4Cr5MoSiV

Minimal Match — 38.2% match based on chemical composition and mechanical property overlap.

ASTM A681 O2 (ASTM A681:2008) and GB/T 1299 4Cr5MoSiV (GB/T 1299-2014) are both steel grades. Both fall under the Tool & Die Steels category. ASTM A681 O2 is typically used for taps, drills, reamers, punches, gauges, while GB/T 1299 4Cr5MoSiV is commonly used for die casting dies, extrusion tooling. ASTM A681 O2 is defined under ASTM International, originating from United States, while GB/T 1299 4Cr5MoSiV is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, ASTM A681 O2 vs GB/T 1299 4Cr5MoSiV is a 57.3% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 38.2%.

Frequently Compared With ASTM A681 O2:
GOST 5950 4H5MFS EN ISO 683-17 100Cr6 GB/T 1299 3Cr2W8V GOST 5950 3H2W8F EN ISO 4957 1.2316 DIN EN ISO 4957 1.2344 GOST 5950 4H5MFS1 DIN EN ISO 4957 1.2379 AISI 52100 GB/T 1299 4Cr5MoSiV1 IS 1570 (Part 6) 50T8 IS 1570 (Part 6) 60T6
Match Breakdown
CHEMISTRY MATCH
57.3%
MECHANICAL MATCH
0%
OVERALL
38.2%
Specifications
Property ASTM A681 O2 GB/T 1299 4Cr5MoSiV
Standard ASTM A681:2008 GB/T 1299-2014
Category Tool & Die Steels Tool & Die Steels
C (%) 0.85-0.95 0.32–0.45
Mn (%) 1.40-1.80 0.20–0.50
P (%) <=0.030 Not specified
S (%) <=0.030 Not specified
Si (%) <=0.50 0.80–1.20
Cr (%) <=0.50 4.75–5.50
V (%) <=0.30 0.30–0.60
Mo (%) <=0.30 1.10–1.60
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property ASTM A681 O2 GB/T 1299 4Cr5MoSiV
Hardness <=217 HB Not specified
Condition Annealed (maximum Brinell hardness) Not specified
Hardness HRC (hardened) Not specified 40–54
Hardness HB (annealed) Not specified ≤235
Typical Applications
ASTM A681 O2
Taps, drills, reamers, punches, gauges
GB/T 1299 4Cr5MoSiV
Die casting dies, extrusion tooling
Key Differences
Can ASTM A681 O2 Be Substituted With GB/T 1299 4Cr5MoSiV?
ASTM A681 O2 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
ASTM A681 O2
Round Bar → (6 listings)
Diameter: 40–60 mm (1.57–2.36 in)
Length: 600–5700 mm (23.62–224.41 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
ASTM A681 O2
6 active listings and RFQs →
GB/T 1299 4Cr5MoSiV
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A681 O2 and GB/T 1299 4Cr5MoSiV?
ASTM A681 O2 specifies P, S which are not specified for GB/T 1299 4Cr5MoSiV.
Can ASTM A681 O2 be substituted with GB/T 1299 4Cr5MoSiV?
ASTM A681 O2 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.