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GB/T 699 80 vs GB/T 699 75

Close Alternative — 78.9% match based on chemical composition and mechanical property overlap.

GB/T 699 80 (GB/T 699:2015) and GB/T 699 75 (GB/T 699:2015) are both steel grades. Both fall under the Carbon Steel category. GB/T 699 80 is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while GB/T 699 75 is commonly used for hot-rolled or forged quality carbon structural steel bars up to 250 mm. GB/T 699 80 is defined under Guobiao Standards (GB/T), originating from China, while GB/T 699 75 is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 699 80 vs GB/T 699 75 is a 93.4% match. As per mechanical properties, the match is 50%. Combined, this makes them a close alternative overall at 78.9%.

Frequently Compared With GB/T 699 80:
BS 970 (Part 1) 040A04 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 3) 045M10 BS 970 (Part 1) 060A40 BS 970 (Part 1) 060A45 BS 970 (Part 1) 040A10 BS 970 (Part 1) 040A12 BS 970 (Part 3) 045A10 BS 970 (Part 1) 045M10 BS 970 (Part 1) 055M15
Match Breakdown
CHEMISTRY MATCH
93.4%
MECHANICAL MATCH
50%
OVERALL
78.9%
Specifications
Property GB/T 699 80 GB/T 699 75
Standard GB/T 699:2015 GB/T 699:2015
Category Carbon Steel Carbon Steel
C (%) 0.77-0.85 0.72-0.80
Si (%) 0.17-0.37 0.17-0.37
Mn (%) 0.50-0.80 0.50-0.80
P (%) <=0.035 <=0.035
S (%) <=0.035 <=0.035
Cr (%) <=0.25 <=0.25
Ni (%) <=0.30 <=0.30
Cu (%) <=0.25 <=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 GB/T 699 80 GB/T 699 75
Tensile Strength >=1080 MPa >=1080 MPa
Yield Strength >=930 MPa >=880 MPa
Elongation >=6% >=7%
Hardness <=285 HB (as delivered, not heat treated) <=285 HB (as delivered, not heat treated)
Condition Quenched and tempered sample (with working allowance), bars up to 80 mm; hardness for delivery state Quenched and tempered sample (with working allowance), bars up to 80 mm; hardness for delivery state
Typical Applications
GB/T 699 80
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
GB/T 699 75
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
Can GB/T 699 80 Be Substituted With GB/T 699 75?
GB/T 699 80 and GB/T 699 75 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
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GB/T 699 80
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GB/T 699 75
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Frequently Asked Questions
What is the difference between GB/T 699 80 and GB/T 699 75?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 80 be substituted with GB/T 699 75?
GB/T 699 80 and GB/T 699 75 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.