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GB/T 1591 Q355B vs ASTM A572 Gr.65

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

GB/T 1591 Q355B (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 Q355B 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 Q355B 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 Q355B vs ASTM A572 Gr.65 is a 73.2% match. As per mechanical properties, the match is 12.1%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GB/T 1591 Q355B:
GOST 19281 09G2S CSA G40.21 400W CSA G40.21 480W ASTM A283C 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 400A ASTM A1008 SS Grade 50 ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
73.2%
MECHANICAL MATCH
12.1%
OVERALL
35%
Specifications
Property GB/T 1591 Q355B ASTM A572 Gr.65
Standard GB/T 1591:2018 ASTM A572
Category Structural Steel Structural Steel
C (%) <=0.24 0.23 max
Si (%) <=0.55 0.40 max
Mn (%) <=1.60 1.35 max
P (%) <=0.035 0.040 max
S (%) <=0.035 0.050 max
Cr (%) <=0.30 Not specified
Ni (%) <=0.30 Not specified
Cu (%) <=0.40 Not specified
N (%) <=0.012 Not specified
V (%) Not specified 0.15 max
Nb (%) Not specified 0.05 max
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 Q355B ASTM A572 Gr.65
Tensile Strength 470-630 MPa 550-690 MPa
Yield Strength >=355 MPa 450 MPa min
Elongation >=22% 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 Q355B
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 Q355B Be Substituted With ASTM A572 Gr.65?
GB/T 1591 Q355B 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 Q355B
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 Q355B
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 Q355B and ASTM A572 Gr.65?
GB/T 1591 Q355B specifies Cr, Ni, Cu, N which are not specified for ASTM A572 Gr.65. ASTM A572 Gr.65 specifies V, Nb which are not specified for GB/T 1591 Q355B.
Can GB/T 1591 Q355B be substituted with ASTM A572 Gr.65?
GB/T 1591 Q355B 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.