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GB/T 699 25Mn vs ASTM A959 S40800

Related Material — 65% match based on chemical composition and mechanical property overlap.

GB/T 699 25Mn (GB/T 699:2015) and ASTM A959 S40800 (ASTM A959:2011) are both steel grades. GB/T 699 25Mn is classified under Carbon Steel, while ASTM A959 S40800 is classified under Stainless Steel — a different category, which is worth noting alongside the chemistry match below. GB/T 699 25Mn is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while ASTM A959 S40800 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). GB/T 699 25Mn is defined under Guobiao Standards (GB/T), originating from China, while ASTM A959 S40800 is defined under ASTM International, originating from United States.

As per chemical composition, GB/T 699 25Mn vs ASTM A959 S40800 is a 66.3% 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 65%.

Frequently Compared With GB/T 699 25Mn:
BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 040A04 BS 970 (Part 1) 040A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A32 BS 970 (Part 1) 060A40
Match Breakdown
CHEMISTRY MATCH
66.3%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property GB/T 699 25Mn ASTM A959 S40800
Standard GB/T 699:2015 ASTM A959:2011
Category Carbon Steel Stainless Steel
C (%) 0.22-0.29 <=0.08
Si (%) 0.17-0.37 <=1.00
Mn (%) 0.70-1.00 <=1.00
P (%) <=0.035 <=0.045
S (%) <=0.035 <=0.045
Cr (%) <=0.25 11.5-13.0
Ni (%) <=0.30 <=0.80
Cu (%) <=0.25 Not specified
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property GB/T 699 25Mn ASTM A959 S40800
Tensile Strength >=490 MPa Not specified
Yield Strength >=295 MPa Not specified
Elongation >=22% Not specified
Hardness <=207 HB (as delivered, not heat treated) Not specified
Condition Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state Not specified
Typical Applications
GB/T 699 25Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
ASTM A959 S40800
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
Can GB/T 699 25Mn Be Substituted With ASTM A959 S40800?
GB/T 699 25Mn and ASTM A959 S40800 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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GB/T 699 25Mn
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ASTM A959 S40800
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Frequently Asked Questions
What is the difference between GB/T 699 25Mn and ASTM A959 S40800?
Different category: GB/T 699 25Mn is Carbon Steel, ASTM A959 S40800 is Stainless Steel. GB/T 699 25Mn specifies Cu which is not specified for ASTM A959 S40800.
Can GB/T 699 25Mn be substituted with ASTM A959 S40800?
GB/T 699 25Mn and ASTM A959 S40800 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.