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ASTM A681 P21 vs GB/T 1299 4Cr5MoSiV

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

ASTM A681 P21 (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 P21 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 P21 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 P21 vs GB/T 1299 4Cr5MoSiV is a 50.1% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With ASTM A681 P21:
DIN EN ISO 4957 1.2379 IS 1570 (Part 6) 103T3 GOST 5950 4H5MFS1 EN ISO 4957 1.2316 DIN EN ISO 4957 1.2344 EN ISO 683-17 100Cr6 IS 1570 (Part 6) 118T3 IS 1570 (Part 6) 133T3 GOST 5950 3H2W8F GB/T 1299 4Cr5MoSiV1 GOST 5950 4H5MFS GB/T 1299 3Cr2W8V
Match Breakdown
CHEMISTRY MATCH
50.1%
MECHANICAL MATCH
No shared data
OVERALL
35%
Specifications
Property ASTM A681 P21 GB/T 1299 4Cr5MoSiV
Standard ASTM A681:2008 GB/T 1299-2014
Category Tool & Die Steels Tool & Die Steels
C (%) 0.18-0.22 0.32–0.45
Mn (%) 0.20-0.40 0.20–0.50
P (%) <=0.030 Not specified
S (%) <=0.030 Not specified
Si (%) 0.20-0.40 0.80–1.20
Cr (%) 0.20-0.30 4.75–5.50
V (%) 0.15-0.25 0.30–0.60
Ni (%) 3.90-4.25 Not specified
Al (%) 1.05-1.25 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 P21 GB/T 1299 4Cr5MoSiV
Hardness HRC (hardened) Not specified 40–54
Hardness HB (annealed) Not specified ≤235
Typical Applications
ASTM A681 P21
Tools, dies and fixtures (clause 1.2)
GB/T 1299 4Cr5MoSiV
Die casting dies, extrusion tooling
Key Differences
Can ASTM A681 P21 Be Substituted With GB/T 1299 4Cr5MoSiV?
ASTM A681 P21 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 P21
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 P21
0 active listings and RFQs →
GB/T 1299 4Cr5MoSiV
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A681 P21 and GB/T 1299 4Cr5MoSiV?
ASTM A681 P21 specifies P, S, Ni, Al which are not specified for GB/T 1299 4Cr5MoSiV. GB/T 1299 4Cr5MoSiV specifies Mo which is not specified for ASTM A681 P21.
Can ASTM A681 P21 be substituted with GB/T 1299 4Cr5MoSiV?
ASTM A681 P21 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.