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GB/T 699 08 vs ASTM A959 305

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

GB/T 699 08 (GB/T 699:2015) and ASTM A959 305 (ASTM A959:2011) are both steel grades. GB/T 699 08 is classified under Carbon Steel, while ASTM A959 305 is classified under Stainless Steel — a different category, which is worth noting alongside the chemistry match below. GB/T 699 08 is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while ASTM A959 305 is commonly used for wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1). GB/T 699 08 is defined under Guobiao Standards (GB/T), originating from China, while ASTM A959 305 is defined under ASTM International, originating from United States.

As per chemical composition, GB/T 699 08 vs ASTM A959 305 is a 66.8% 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 08:
BS 970 (Part 1) 040A04 BS 970 (Part 1) 045M10 BS 970 (Part 1) 060A40 BS 970 (Part 1) 040A12 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045A10 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 055M15 BS 970 (Part 1) 060A32 BS 970 (Part 1) 060A45
Match Breakdown
CHEMISTRY MATCH
66.8%
MECHANICAL MATCH
No shared data
OVERALL
65%
Specifications
Property GB/T 699 08 ASTM A959 305
Standard GB/T 699:2015 ASTM A959:2011
Category Carbon Steel Stainless Steel
C (%) 0.05-0.11 <=0.12
Si (%) 0.17-0.37 <=1.00
Mn (%) 0.35-0.65 <=2.00
P (%) <=0.035 <=0.045
S (%) <=0.035 <=0.030
Cr (%) <=0.10 17.0-19.0
Ni (%) <=0.30 11.0-13.0
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 08 ASTM A959 305
Tensile Strength >=325 MPa Not specified
Yield Strength >=195 MPa Not specified
Elongation >=33% Not specified
Hardness <=131 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 08
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
ASTM A959 305
Wrought stainless steel products; recommended composition limits for adoption by product standards (clause 1.1)
Key Differences
Can GB/T 699 08 Be Substituted With ASTM A959 305?
GB/T 699 08 and ASTM A959 305 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 08
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Frequently Asked Questions
What is the difference between GB/T 699 08 and ASTM A959 305?
Different category: GB/T 699 08 is Carbon Steel, ASTM A959 305 is Stainless Steel. GB/T 699 08 specifies Cu which is not specified for ASTM A959 305.
Can GB/T 699 08 be substituted with ASTM A959 305?
GB/T 699 08 and ASTM A959 305 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.