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ASTM A681 O1 vs GB/T 1299 4Cr5MoSiV

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

ASTM A681 O1 (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 O1 is typically used for tools, dies and fixtures (clause 1.2), while GB/T 1299 4Cr5MoSiV is commonly used for die casting dies, extrusion tooling. ASTM A681 O1 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 O1 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 ASTM A681 O1:
EN ISO 683-17 100Cr6 IS 1570 (Part 6) 133T3 EN ISO 4957 1.2316 GB/T 1299 3Cr2W8V GB/T 1299 4Cr5MoSiV1 DIN EN ISO 4957 1.2344 DIN EN ISO 4957 1.2379 IS 1570 (Part 6) 103T3 IS 1570 (Part 6) 118T3 GOST 5950 3H2W8F GOST 5950 4H5MFS GOST 5950 4H5MFS1
Match Breakdown
CHEMISTRY MATCH
49.2%
MECHANICAL MATCH
0%
OVERALL
32.8%
Specifications
Property ASTM A681 O1 GB/T 1299 4Cr5MoSiV
Standard ASTM A681:2008 GB/T 1299-2014
Category Tool & Die Steels Tool & Die Steels
C (%) 0.85-1.00 0.32–0.45
Mn (%) 1.00-1.40 0.20–0.50
P (%) <=0.030 Not specified
S (%) <=0.030 Not specified
Si (%) 0.10-0.50 0.80–1.20
Cr (%) 0.40-0.70 4.75–5.50
V (%) <=0.30 0.30–0.60
W (%) 0.40-0.60 Not specified
Mo (%) Not specified 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 O1 GB/T 1299 4Cr5MoSiV
Hardness <=212 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 O1
Tools, dies and fixtures (clause 1.2)
GB/T 1299 4Cr5MoSiV
Die casting dies, extrusion tooling
Key Differences
Can ASTM A681 O1 Be Substituted With GB/T 1299 4Cr5MoSiV?
ASTM A681 O1 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 O1
No active listings currently.
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 O1
0 active listings and RFQs →
GB/T 1299 4Cr5MoSiV
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A681 O1 and GB/T 1299 4Cr5MoSiV?
ASTM A681 O1 specifies P, S, W which are not specified for GB/T 1299 4Cr5MoSiV. GB/T 1299 4Cr5MoSiV specifies Mo which is not specified for ASTM A681 O1.
Can ASTM A681 O1 be substituted with GB/T 1299 4Cr5MoSiV?
ASTM A681 O1 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.