Close Alternative — 74.3% match
based on chemical composition and mechanical property overlap.
GB/T 699 15Mn (GB/T 699:2015) and GB/T 699 20 (GB/T 699:2015) are both steel grades.
Both fall under the Carbon Steel category.
GB/T 699 15Mn is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while GB/T 699 20 is commonly used for used for shafts, pins, carburized parts, welded structures, bolts, and machine brackets..
GB/T 699 15Mn is defined under Guobiao Standards (GB/T), originating from China, while GB/T 699 20 is defined under Guobiao Standards (GB/T), originating from China.
As per chemical composition, GB/T 699 15Mn vs GB/T 699 20 is a 86.5% match.
As per mechanical properties, the match is 50%.
Combined, this makes them a close alternative overall at 74.3%.
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 15Mn
GB/T 699 20
Tensile Strength
>=410 MPa
>=410 MPa
Yield Strength
>=245 MPa
>=245 MPa
Elongation
>=26%
>=25%
Hardness
<=163 HB (as delivered, not heat treated)
<=156 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 15Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
GB/T 699 20
Used for shafts, pins, carburized parts, welded structures, bolts, and machine brackets.
Can GB/T 699 15Mn Be Substituted With GB/T 699 20?
GB/T 699 15Mn and GB/T 699 20 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 15Mn and GB/T 699 20?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 15Mn be substituted with GB/T 699 20?
GB/T 699 15Mn and GB/T 699 20 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.