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GB/T 1591 Q420C vs GB/T 1591 Q420MD

Close Alternative — 82.6% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q420C (GB/T 1591:2018) and GB/T 1591 Q420MD (GB/T 1591:2018) are both steel grades. Both fall under the Structural Steel category. GB/T 1591 Q420C is typically used for general structure for engineering (plates, strips, bars and sections), while GB/T 1591 Q420MD is commonly used for general structure for engineering (plates, strips, bars and sections). GB/T 1591 Q420C is defined under Guobiao Standards (GB/T), originating from China, while GB/T 1591 Q420MD is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 1591 Q420C vs GB/T 1591 Q420MD is a 90.6% match. As per mechanical properties, the match is 66.7%. Combined, this makes them a close alternative overall at 82.6%.

Frequently Compared With GB/T 1591 Q420C:
GOST 19281 09G2S 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 80 ASTM A572 Gr.65
Other Structural Steel Grades to Compare With GB/T 1591 Q420C:
CSA G40.21 260W AS/NZS 3679.1 300 CSA G40.21 400A ASTM A1008 SS Grade 50
Match Breakdown
CHEMISTRY MATCH
90.6%
MECHANICAL MATCH
66.7%
OVERALL
82.6%
Specifications
Property GB/T 1591 Q420C GB/T 1591 Q420MD
Standard GB/T 1591:2018 GB/T 1591:2018
Category Structural Steel Structural Steel
C (%) <=0.20 <=0.16
Si (%) <=0.55 <=0.50
Mn (%) <=1.70 <=1.70
P (%) <=0.030 <=0.030
S (%) <=0.030 <=0.025
Nb (%) <=0.05 0.01-0.05
V (%) <=0.13 0.01-0.12
Ti (%) <=0.05 0.006-0.05
Cr (%) <=0.30 <=0.30
Ni (%) <=0.80 <=0.80
Cu (%) <=0.40 <=0.40
Mo (%) <=0.20 <=0.20
N (%) <=0.015 <=0.025
Al (%) Not specified >=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 Q420C GB/T 1591 Q420MD
Tensile Strength 520-680 MPa 520-680 MPa
Yield Strength >=420 MPa >=420 MPa
Elongation >=20% >=19%
Condition Hot-rolled (as-rolled), nominal thickness or diameter up to 16 mm for yield; tensile strength for up to 100 mm; elongation longitudinal, up to 40 mm Thermomechanical processed (TMCP), nominal thickness or diameter up to 16 mm (tensile strength: up to 40 mm)
Typical Applications
GB/T 1591 Q420C
General structure for engineering (plates, strips, bars and sections)
GB/T 1591 Q420MD
General structure for engineering (plates, strips, bars and sections)
Key Differences
Can GB/T 1591 Q420C Be Substituted With GB/T 1591 Q420MD?
GB/T 1591 Q420C and GB/T 1591 Q420MD 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.
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GB/T 1591 Q420C
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GB/T 1591 Q420MD
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Frequently Asked Questions
What is the difference between GB/T 1591 Q420C and GB/T 1591 Q420MD?
GB/T 1591 Q420MD specifies Al which is not specified for GB/T 1591 Q420C.
Can GB/T 1591 Q420C be substituted with GB/T 1591 Q420MD?
GB/T 1591 Q420C and GB/T 1591 Q420MD 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.