Strong Match — 98.4% match
based on chemical composition and mechanical property overlap.
GB/T 1591 Q420ND (GB/T 1591:2018) and GB/T 1591 Q420NB (GB/T 1591:2018) are both steel grades.
Both fall under the Structural Steel category.
GB/T 1591 Q420ND is typically used for general structure for engineering (plates, strips, bars and sections), while GB/T 1591 Q420NB is commonly used for general structure for engineering (plates, strips, bars and sections).
GB/T 1591 Q420ND is defined under Guobiao Standards (GB/T), originating from China, while GB/T 1591 Q420NB is defined under Guobiao Standards (GB/T), originating from China.
As per chemical composition, GB/T 1591 Q420ND vs GB/T 1591 Q420NB is a 97.6% match.
As per mechanical properties, the match is 100%.
Combined, this makes them a strong match overall at 98.4%.
Other Structural Steel Grades to Compare With GB/T 1591 Q420ND:
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 1591 Q420ND
GB/T 1591 Q420NB
Tensile Strength
520-680 MPa
520-680 MPa
Yield Strength
>=420 MPa
>=420 MPa
Elongation
>=19%
>=19%
Condition
Normalized or normalizing rolled, nominal thickness or diameter up to 16 mm (tensile strength: up to 100 mm)
Normalized or normalizing rolled, nominal thickness or diameter up to 16 mm (tensile strength: up to 100 mm)
Typical Applications
GB/T 1591 Q420ND
General structure for engineering (plates, strips, bars and sections)
GB/T 1591 Q420NB
General structure for engineering (plates, strips, bars and sections)
Can GB/T 1591 Q420ND Be Substituted With GB/T 1591 Q420NB?
GB/T 1591 Q420ND and GB/T 1591 Q420NB overlap closely enough on chemistry and mechanical properties that GB/T 1591 Q420NB is often considered as a substitute for GB/T 1591 Q420ND in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
What is the difference between GB/T 1591 Q420ND and GB/T 1591 Q420NB?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 1591 Q420ND be substituted with GB/T 1591 Q420NB?
GB/T 1591 Q420ND and GB/T 1591 Q420NB overlap closely enough on chemistry and mechanical properties that GB/T 1591 Q420NB is often considered as a substitute for GB/T 1591 Q420ND in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.