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GB/T 1591 Q420B vs ASTM A283C

Minimal Match — 35% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q420B (GB/T 1591:2018) and ASTM A283C (ASTM A283) are both steel grades. Both fall under the Structural Steel category. GB/T 1591 Q420B is typically used for general structure for engineering (plates, strips, bars and sections), while ASTM A283C is commonly used for used for structural fabrication, storage tanks, buildings, bridges, machinery bases, and welded structures.. GB/T 1591 Q420B is defined under Guobiao Standards (GB/T), originating from China, while ASTM A283C is defined under ASTM International, originating from United States.

As per chemical composition, GB/T 1591 Q420B vs ASTM A283C is a 64.3% match. As per mechanical properties, the match is 0%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GB/T 1591 Q420B:
GOST 19281 09G2S AS/NZS 3679.1 300 CSA G40.21 300W ASTM A572 Gr.65 CSA G40.21 260W 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
Other Structural Steel Grades to Compare With GB/T 1591 Q420B:
CSA G40.21 400A
Match Breakdown
CHEMISTRY MATCH
64.3%
MECHANICAL MATCH
0%
OVERALL
35%
Specifications
Property GB/T 1591 Q420B ASTM A283C
Standard GB/T 1591:2018 ASTM A283
Category Structural Steel Structural Steel
C (%) <=0.20 0.24 max
Si (%) <=0.55 0.40 max
Mn (%) <=1.70 0.90 max
P (%) <=0.035 0.035 max
S (%) <=0.035 0.040 max
Nb (%) <=0.05 Not specified
V (%) <=0.13 Not specified
Ti (%) <=0.05 Not specified
Cr (%) <=0.30 Not specified
Ni (%) <=0.80 Not specified
Cu (%) <=0.40 Not specified
Mo (%) <=0.20 Not specified
N (%) <=0.015 Not specified
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 Q420B ASTM A283C
Tensile Strength 520-680 MPa 380-515 MPa
Yield Strength >=420 MPa 205 MPa min
Elongation >=20% 23-27%
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 Not specified
Hardness Not specified 120-170 HB
Typical Applications
GB/T 1591 Q420B
General structure for engineering (plates, strips, bars and sections)
ASTM A283C
Used for structural fabrication, storage tanks, buildings, bridges, machinery bases, and welded structures.
Key Differences
Can GB/T 1591 Q420B Be Substituted With ASTM A283C?
GB/T 1591 Q420B and ASTM A283C share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
GB/T 1591 Q420B
No active listings currently.
ASTM A283C
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2900–3700 mm (114.17–145.67 in)
On M-EX Right Now
GB/T 1591 Q420B
0 active listings and RFQs →
ASTM A283C
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q420B and ASTM A283C?
GB/T 1591 Q420B specifies Nb, V, Ti, Cr which are not specified for ASTM A283C.
Can GB/T 1591 Q420B be substituted with ASTM A283C?
GB/T 1591 Q420B and ASTM A283C share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.