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GB/T 1591 Q420MD vs GB/T 1591 Q420MC

Strong Match — 98.9% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q420MD (GB/T 1591:2018) and GB/T 1591 Q420MC (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 Q420MC 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 Q420MC is defined under Guobiao Standards (GB/T), originating from China.

As per chemical composition, GB/T 1591 Q420MD vs GB/T 1591 Q420MC is a 98.4% match. As per mechanical properties, the match is 100%. Combined, this makes them a strong match overall at 98.9%.

Frequently Compared With GB/T 1591 Q420MD:
GOST 19281 09G2S CSA G40.21 260W AS/NZS 3679.1 300 AS/NZS 3679.1 350 CSA G40.21 350W CSA G40.21 400A CSA G40.21 400W CSA G40.21 480W ASTM A1008 SS Grade 80 ASTM A283C CSA G40.21 300W ASTM A1008 SS Grade 50
Match Breakdown
CHEMISTRY MATCH
98.4%
MECHANICAL MATCH
100%
OVERALL
98.9%
Specifications
Property GB/T 1591 Q420MD GB/T 1591 Q420MC
Standard GB/T 1591:2018 GB/T 1591:2018
Category Structural Steel Structural Steel
C (%) <=0.16 <=0.16
Si (%) <=0.50 <=0.50
Mn (%) <=1.70 <=1.70
P (%) <=0.030 <=0.030
S (%) <=0.025 <=0.030
Nb (%) 0.01-0.05 0.01-0.05
V (%) 0.01-0.12 0.01-0.12
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 <=0.20
N (%) <=0.025 <=0.015
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 Q420MC
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) Thermomechanical processed (TMCP), nominal thickness or diameter up to 16 mm (tensile strength: up to 40 mm)
Typical Applications
GB/T 1591 Q420MD
General structure for engineering (plates, strips, bars and sections)
GB/T 1591 Q420MC
General structure for engineering (plates, strips, bars and sections)
Can GB/T 1591 Q420MD Be Substituted With GB/T 1591 Q420MC?
GB/T 1591 Q420MD and GB/T 1591 Q420MC overlap closely enough on chemistry and mechanical properties that GB/T 1591 Q420MC 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 Q420MC
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Frequently Asked Questions
What is the difference between GB/T 1591 Q420MD and GB/T 1591 Q420MC?
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 Q420MC?
GB/T 1591 Q420MD and GB/T 1591 Q420MC overlap closely enough on chemistry and mechanical properties that GB/T 1591 Q420MC 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.