Close Alternative — 75.5% match
based on chemical composition and mechanical property overlap.
GB/T 699 35 (GB/T 699:2015) and GB/T 699 30Mn (GB/T 699:2015) are both steel grades.
Both fall under the Carbon Steel category.
GB/T 699 35 is typically used for used for shafts, connecting rods, bolts, forged parts, gears, and machine components., while GB/T 699 30Mn is commonly used for hot-rolled or forged quality carbon structural steel bars up to 250 mm.
GB/T 699 35 is defined under Guobiao Standards (GB/T), originating from China, while GB/T 699 30Mn is defined under Guobiao Standards (GB/T), originating from China.
As per chemical composition, GB/T 699 35 vs GB/T 699 30Mn is a 88.3% match.
As per mechanical properties, the match is 50%.
Combined, this makes them a close alternative overall at 75.5%.
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 35
GB/T 699 30Mn
Tensile Strength
>=530 MPa
>=540 MPa
Yield Strength
>=315 MPa
>=315 MPa
Elongation
>=20%
>=20%
Hardness
<=197 HB (as delivered, not heat treated)
<=217 HB (as delivered, not heat treated)
Condition
Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state
Normalized 25 mm sample blank, bars up to 80 mm; hardness for delivery state
Typical Applications
GB/T 699 35
Used for shafts, connecting rods, bolts, forged parts, gears, and machine components.
GB/T 699 30Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
Can GB/T 699 35 Be Substituted With GB/T 699 30Mn?
GB/T 699 35 and GB/T 699 30Mn 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 35 and GB/T 699 30Mn?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 35 be substituted with GB/T 699 30Mn?
GB/T 699 35 and GB/T 699 30Mn 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.