Close Alternative — 70.6% match
based on chemical composition and mechanical property overlap.
GB/T 699 85 (GB/T 699:2015) and GB/T 699 80 (GB/T 699:2015) are both steel grades.
Both fall under the Carbon Steel category.
GB/T 699 85 is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while GB/T 699 80 is commonly used for hot-rolled or forged quality carbon structural steel bars up to 250 mm.
GB/T 699 85 is defined under Guobiao Standards (GB/T), originating from China, while GB/T 699 80 is defined under Guobiao Standards (GB/T), originating from China.
As per chemical composition, GB/T 699 85 vs GB/T 699 80 is a 93.4% match.
As per mechanical properties, the match is 25%.
Combined, this makes them a close alternative overall at 70.6%.
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 85
GB/T 699 80
Tensile Strength
>=1130 MPa
>=1080 MPa
Yield Strength
>=980 MPa
>=930 MPa
Elongation
>=6%
>=6%
Hardness
<=302 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 85
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
GB/T 699 80
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
Can GB/T 699 85 Be Substituted With GB/T 699 80?
GB/T 699 85 and GB/T 699 80 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.
What is the difference between GB/T 699 85 and GB/T 699 80?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 85 be substituted with GB/T 699 80?
GB/T 699 85 and GB/T 699 80 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.