Close Alternative — 84.8% match
based on chemical composition and mechanical property overlap.
GB/T 699 50Mn (GB/T 699:2015) and GB/T 699 55 (GB/T 699:2015) are both steel grades.
Both fall under the Carbon Steel category.
GB/T 699 50Mn is typically used for hot-rolled or forged quality carbon structural steel bars up to 250 mm, while GB/T 699 55 is commonly used for used for springs, wear plates, shafts, rollers, high-strength pins, and machine tools..
GB/T 699 50Mn is defined under Guobiao Standards (GB/T), originating from China, while GB/T 699 55 is defined under Guobiao Standards (GB/T), originating from China.
As per chemical composition, GB/T 699 50Mn vs GB/T 699 55 is a 89.7% match.
As per mechanical properties, the match is 75%.
Combined, this makes them a close alternative overall at 84.8%.
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 50Mn
GB/T 699 55
Tensile Strength
>=645 MPa
>=645 MPa
Yield Strength
>=390 MPa
>=380 MPa
Elongation
>=13%
>=13%
Hardness
<=255 HB (as delivered, not heat treated)
<=255 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 50Mn
Hot-rolled or forged quality carbon structural steel bars up to 250 mm
GB/T 699 55
Used for springs, wear plates, shafts, rollers, high-strength pins, and machine tools.
Can GB/T 699 50Mn Be Substituted With GB/T 699 55?
GB/T 699 50Mn and GB/T 699 55 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 50Mn and GB/T 699 55?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 699 50Mn be substituted with GB/T 699 55?
GB/T 699 50Mn and GB/T 699 55 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.