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ASTM A681 P21 vs GB/T 699 20Mn

Related Material — 64.6% match based on chemical composition and mechanical property overlap.

ASTM A681 P21 (ASTM A681:2008) and GB/T 699 20Mn (GB/T 699:2015) are both steel grades. ASTM A681 P21 is classified under Tool & Die Steels, while GB/T 699 20Mn is classified under Carbon Steel — a different category, which is worth noting alongside the chemistry match below. ASTM A681 P21 is typically used for tools, dies and fixtures (clause 1.2), while GB/T 699 20Mn is commonly used for hot-rolled or forged quality carbon structural steel bars up to 250 mm. ASTM A681 P21 is defined under ASTM International, originating from United States, while GB/T 699 20Mn is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, ASTM A681 P21 vs GB/T 699 20Mn is a 64.6% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 64.6%.

Frequently Compared With ASTM A681 P21:
GB/T 1299 4Cr5MoSiV 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
Match Breakdown
CHEMISTRY MATCH
64.6%
MECHANICAL MATCH
No shared data
OVERALL
64.6%
Specifications
Property ASTM A681 P21 GB/T 699 20Mn
Standard ASTM A681:2008 GB/T 699:2015
Category Tool & Die Steels Carbon Steel
C (%) 0.18-0.22 0.17-0.23
Mn (%) 0.20-0.40 0.70-1.00
P (%) <=0.030 <=0.035
S (%) <=0.030 <=0.035
Si (%) 0.20-0.40 0.17-0.37
Cr (%) 0.20-0.30 <=0.25
V (%) 0.15-0.25 Not specified
Ni (%) 3.90-4.25 <=0.30
Al (%) 1.05-1.25 Not specified
Cu (%) Not specified <=0.25
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 699 20Mn
Tensile Strength Not specified >=450 MPa
Yield Strength Not specified >=275 MPa
Elongation Not specified >=24%
Hardness Not specified <=197 HB (as delivered, not heat treated)
Condition Not specified Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state
Typical Applications
ASTM A681 P21
Tools, dies and fixtures (clause 1.2)
GB/T 699 20Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
Key Differences
Can ASTM A681 P21 Be Substituted With GB/T 699 20Mn?
ASTM A681 P21 and GB/T 699 20Mn 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.
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ASTM A681 P21
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GB/T 699 20Mn
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Frequently Asked Questions
What is the difference between ASTM A681 P21 and GB/T 699 20Mn?
Different category: ASTM A681 P21 is Tool & Die Steels, GB/T 699 20Mn is Carbon Steel. ASTM A681 P21 specifies V, Al which are not specified for GB/T 699 20Mn. GB/T 699 20Mn specifies Cu which is not specified for ASTM A681 P21.
Can ASTM A681 P21 be substituted with GB/T 699 20Mn?
ASTM A681 P21 and GB/T 699 20Mn 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.