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GB/T 1591 Q420C vs ASTM A572 Gr.65

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

GB/T 1591 Q420C (GB/T 1591:2018) and ASTM A572 Gr.65 (ASTM A572) 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 ASTM A572 Gr.65 is commonly used for used for bridges, buildings, transmission towers, construction equipment, offshore structures, and structural members.. GB/T 1591 Q420C is defined under Guobiao Standards (GB/T), originating from China, while ASTM A572 Gr.65 is defined under ASTM International, originating from United States.

As per chemical composition, GB/T 1591 Q420C vs ASTM A572 Gr.65 is a 67.4% match. As per mechanical properties, the match is 25.5%. Combined, this makes them a minimal match overall at 35%.

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
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 ASTM A1008 SS Grade 80 ASTM A283C
Match Breakdown
CHEMISTRY MATCH
67.4%
MECHANICAL MATCH
25.5%
OVERALL
35%
Specifications
Property GB/T 1591 Q420C ASTM A572 Gr.65
Standard GB/T 1591:2018 ASTM A572
Category Structural Steel Structural Steel
C (%) <=0.20 0.23 max
Si (%) <=0.55 0.40 max
Mn (%) <=1.70 1.35 max
P (%) <=0.030 0.040 max
S (%) <=0.030 0.050 max
Nb (%) <=0.05 0.05 max
V (%) <=0.13 0.15 max
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 Q420C ASTM A572 Gr.65
Tensile Strength 520-680 MPa 550-690 MPa
Yield Strength >=420 MPa 450 MPa min
Elongation >=20% 18-21%
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 170-220 HB
Typical Applications
GB/T 1591 Q420C
General structure for engineering (plates, strips, bars and sections)
ASTM A572 Gr.65
Used for bridges, buildings, transmission towers, construction equipment, offshore structures, and structural members.
Key Differences
Can GB/T 1591 Q420C Be Substituted With ASTM A572 Gr.65?
GB/T 1591 Q420C and ASTM A572 Gr.65 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 Q420C
No active listings currently.
ASTM A572 Gr.65
Plate → (4 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2600–4400 mm (102.36–173.23 in)
On M-EX Right Now
GB/T 1591 Q420C
0 active listings and RFQs →
ASTM A572 Gr.65
4 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q420C and ASTM A572 Gr.65?
GB/T 1591 Q420C specifies Ti, Cr, Ni, Cu which are not specified for ASTM A572 Gr.65.
Can GB/T 1591 Q420C be substituted with ASTM A572 Gr.65?
GB/T 1591 Q420C and ASTM A572 Gr.65 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.