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GB/T 1591 Q420MD vs GB/T 1591 Q420ND

Strong Match — 91.5% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q420MD (GB/T 1591:2018) and GB/T 1591 Q420ND (GB/T 1591:2018) are both steel grades. Both fall under the Structural Steel category. GB/T 1591 Q420MD is typically used for general structure for engineering (plates, strips, bars and sections), while GB/T 1591 Q420ND is commonly used for general structure for engineering (plates, strips, bars and sections). GB/T 1591 Q420MD is defined under Guobiao Standards (GB/T), originating from China, while GB/T 1591 Q420ND is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 1591 Q420MD vs GB/T 1591 Q420ND is a 87.3% match. As per mechanical properties, the match is 100%. Combined, this makes them a strong match overall at 91.5%.

Frequently Compared With GB/T 1591 Q420MD:
CSA G40.21 400A ASTM A283C GOST 19281 09G2S CSA G40.21 260W AS/NZS 3679.1 300 CSA G40.21 300W AS/NZS 3679.1 350 CSA G40.21 350W CSA G40.21 400W CSA G40.21 480W ASTM A1008 SS Grade 50 ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
87.3%
MECHANICAL MATCH
100%
OVERALL
91.5%
Specifications
Property GB/T 1591 Q420MD GB/T 1591 Q420ND
Standard GB/T 1591:2018 GB/T 1591:2018
Category Structural Steel Structural Steel
C (%) <=0.16 <=0.20
Si (%) <=0.50 <=0.60
Mn (%) <=1.70 1.00-1.70
P (%) <=0.030 <=0.030
S (%) <=0.025 <=0.025
Nb (%) 0.01-0.05 0.01-0.05
V (%) 0.01-0.12 0.01-0.20
Ti (%) 0.006-0.05 0.006-0.05
Cr (%) <=0.30 <=0.30
Ni (%) <=0.80 <=0.80
Cu (%) <=0.40 <=0.40
Mo (%) <=0.20 <=0.10
N (%) <=0.025 <=0.025
Al (%) >=0.015 >=0.015
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 Q420MD GB/T 1591 Q420ND
Tensile Strength 520-680 MPa 520-680 MPa
Yield Strength >=420 MPa >=420 MPa
Elongation >=19% >=19%
Condition Thermomechanical processed (TMCP), nominal thickness or diameter up to 16 mm (tensile strength: up to 40 mm) Normalized or normalizing rolled, nominal thickness or diameter up to 16 mm (tensile strength: up to 100 mm)
Typical Applications
GB/T 1591 Q420MD
General structure for engineering (plates, strips, bars and sections)
GB/T 1591 Q420ND
General structure for engineering (plates, strips, bars and sections)
Can GB/T 1591 Q420MD Be Substituted With GB/T 1591 Q420ND?
GB/T 1591 Q420MD and GB/T 1591 Q420ND overlap closely enough on chemistry and mechanical properties that GB/T 1591 Q420ND is often considered as a substitute for GB/T 1591 Q420MD in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
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GB/T 1591 Q420MD
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GB/T 1591 Q420ND
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Frequently Asked Questions
What is the difference between GB/T 1591 Q420MD and GB/T 1591 Q420ND?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can GB/T 1591 Q420MD be substituted with GB/T 1591 Q420ND?
GB/T 1591 Q420MD and GB/T 1591 Q420ND overlap closely enough on chemistry and mechanical properties that GB/T 1591 Q420ND is often considered as a substitute for GB/T 1591 Q420MD in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.