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ASTM A681 O6 vs GB/T 1299 4Cr5MoSiV1

Minimal Match — 40.5% match based on chemical composition and mechanical property overlap.

ASTM A681 O6 (ASTM A681:2008) and GB/T 1299 4Cr5MoSiV1 (GB/T 1299-2014) are both steel grades. Both fall under the Tool & Die Steels category. ASTM A681 O6 is typically used for tools, dies and fixtures (clause 1.2), while GB/T 1299 4Cr5MoSiV1 is commonly used for die casting dies, forging dies, extrusion tools. ASTM A681 O6 is defined under ASTM International, originating from United States, while GB/T 1299 4Cr5MoSiV1 is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, ASTM A681 O6 vs GB/T 1299 4Cr5MoSiV1 is a 60.8% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 40.5%.

Frequently Compared With ASTM A681 O6:
EN ISO 683-17 100Cr6 GOST 5950 3H2W8F DIN EN ISO 4957 1.2379 IS 1570 (Part 6) 118T3 GB/T 1299 4Cr5MoSiV GOST 5950 4H5MFS EN ISO 4957 1.2316 DIN EN ISO 4957 1.2344 IS 1570 (Part 6) 103T3 GOST 5950 4H5MFS1 IS 1570 (Part 6) 133T3 GB/T 1299 3Cr2W8V
Match Breakdown
CHEMISTRY MATCH
60.8%
MECHANICAL MATCH
0%
OVERALL
40.5%
Specifications
Property ASTM A681 O6 GB/T 1299 4Cr5MoSiV1
Standard ASTM A681:2008 GB/T 1299-2014
Category Tool & Die Steels Tool & Die Steels
C (%) 1.25-1.55 0.32–0.45
Mn (%) 0.30-1.10 0.20–0.50
P (%) <=0.030 Not specified
S (%) <=0.030 Not specified
Si (%) 0.55-1.50 0.80–1.20
Cr (%) <=0.30 4.75–5.50
Mo (%) 0.20-0.30 1.20–1.75
V (%) Not specified 0.80–1.20
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 O6 GB/T 1299 4Cr5MoSiV1
Hardness <=229 HB Not specified
Condition Annealed (maximum Brinell hardness) Not specified
Hardness HRC (hardened) Not specified 42–54
Hardness HB (annealed) Not specified ≤235
Typical Applications
ASTM A681 O6
Tools, dies and fixtures (clause 1.2)
GB/T 1299 4Cr5MoSiV1
Die casting dies, forging dies, extrusion tools
Key Differences
Can ASTM A681 O6 Be Substituted With GB/T 1299 4Cr5MoSiV1?
ASTM A681 O6 and GB/T 1299 4Cr5MoSiV1 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 O6
No active listings currently.
GB/T 1299 4Cr5MoSiV1
Round Bar → (2 listings)
Diameter: 80–80 mm (3.15–3.15 in)
Length: 2700–4100 mm (106.3–161.42 in)
On M-EX Right Now
ASTM A681 O6
0 active listings and RFQs →
GB/T 1299 4Cr5MoSiV1
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A681 O6 and GB/T 1299 4Cr5MoSiV1?
ASTM A681 O6 specifies P, S which are not specified for GB/T 1299 4Cr5MoSiV1. GB/T 1299 4Cr5MoSiV1 specifies V which is not specified for ASTM A681 O6.
Can ASTM A681 O6 be substituted with GB/T 1299 4Cr5MoSiV1?
ASTM A681 O6 and GB/T 1299 4Cr5MoSiV1 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.