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GB/T 1591 Q420B vs AS/NZS 3679.1 350

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

GB/T 1591 Q420B (GB/T 1591:2018) and AS/NZS 3679.1 350 (AS/NZS 3679.1:2016) 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 AS/NZS 3679.1 350 is commonly used for hot-rolled structural bars and sections for primary structural beams, columns, and framing. GB/T 1591 Q420B is defined under Guobiao Standards (GB/T), originating from China, while AS/NZS 3679.1 350 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand.

As per chemical composition, GB/T 1591 Q420B vs AS/NZS 3679.1 350 is a 68.4% match. As per mechanical properties, the match is 53.3%. Combined, this makes them a minimal match overall at 35%.

Frequently Compared With GB/T 1591 Q420B:
ASTM A572 Gr.65 GOST 19281 09G2S CSA G40.21 260W AS/NZS 3679.1 300 CSA G40.21 300W CSA G40.21 350W CSA G40.21 480W ASTM A1008 SS Grade 50 ASTM A283C
Other Structural Steel Grades to Compare With GB/T 1591 Q420B:
CSA G40.21 400A CSA G40.21 400W ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
68.4%
MECHANICAL MATCH
53.3%
OVERALL
35%
Specifications
Property GB/T 1591 Q420B AS/NZS 3679.1 350
Standard GB/T 1591:2018 AS/NZS 3679.1:2016
Category Structural Steel Structural Steel
C (%) <=0.20 <=0.22
Si (%) <=0.55 <=0.50
Mn (%) <=1.70 <=1.70
P (%) <=0.035 <=0.040
S (%) <=0.035 <=0.040
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 AS/NZS 3679.1 350
Tensile Strength 520-680 MPa 480-640 MPa
Yield Strength >=420 MPa 350 MPa min
Elongation >=20% 20% min
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
Typical Applications
GB/T 1591 Q420B
General structure for engineering (plates, strips, bars and sections)
AS/NZS 3679.1 350
Hot-rolled structural bars and sections for primary structural beams, columns, and framing
Key Differences
Can GB/T 1591 Q420B Be Substituted With AS/NZS 3679.1 350?
GB/T 1591 Q420B and AS/NZS 3679.1 350 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.
AS/NZS 3679.1 350
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2900–3200 mm (114.17–125.98 in)
On M-EX Right Now
GB/T 1591 Q420B
0 active listings and RFQs →
AS/NZS 3679.1 350
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q420B and AS/NZS 3679.1 350?
GB/T 1591 Q420B specifies Nb, V, Ti, Cr which are not specified for AS/NZS 3679.1 350.
Can GB/T 1591 Q420B be substituted with AS/NZS 3679.1 350?
GB/T 1591 Q420B and AS/NZS 3679.1 350 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.