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GB/T 1591 Q345B vs AS/NZS 3679.1 300

Related Material — 64% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q345B (GB/T 1591-2018) and AS/NZS 3679.1 300 (AS/NZS 3679.1:2016) are both steel grades. Both fall under the Structural Steel category. GB/T 1591 Q345B is typically used for bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery, while AS/NZS 3679.1 300 is commonly used for hot-rolled structural bars and sections for general structural framing. GB/T 1591 Q345B is defined under Guobiao Standards (GB/T), originating from China, while AS/NZS 3679.1 300 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand.

As per chemical composition, GB/T 1591 Q345B vs AS/NZS 3679.1 300 is a 84.6% match. As per mechanical properties, the match is 22.8%. Combined, this makes them a related material overall at 64%.

Frequently Compared With GB/T 1591 Q345B:
CSA G40.21 300W CSA G40.21 480W CSA G40.21 400W GOST 19281 09G2S CSA G40.21 260W CSA G40.21 350W CSA G40.21 400A ASTM A1008 SS Grade 50 AS/NZS 3679.1 350 ASTM A572 Grade 50 ASTM A1008 SS Grade 80 ASTM A283C
Match Breakdown
CHEMISTRY MATCH
84.6%
MECHANICAL MATCH
22.8%
OVERALL
64%
Specifications
Property GB/T 1591 Q345B AS/NZS 3679.1 300
Standard GB/T 1591-2018 AS/NZS 3679.1:2016
Category Structural Steel Structural Steel
C (%) <=0.20 <=0.22
Si (%) <=0.50 <=0.50
Mn (%) 1.00-1.60 <=1.70
S (%) <=0.035 <=0.040
P (%) <=0.035 <=0.040
V (%) <=0.20 Not specified
Nb (%) <=0.07 Not specified
Ti (%) <=0.20 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 Q345B AS/NZS 3679.1 300
Tensile Strength 470-630 MPa 440-600 MPa
Yield Strength >=345 MPa 300 MPa min
Elongation >=21% 22% min
Impact Energy >=34 J Not specified
Typical Applications
GB/T 1591 Q345B
bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery
AS/NZS 3679.1 300
Hot-rolled structural bars and sections for general structural framing
Key Differences
Can GB/T 1591 Q345B Be Substituted With AS/NZS 3679.1 300?
GB/T 1591 Q345B and AS/NZS 3679.1 300 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 Q345B
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3800–4000 mm (149.61–157.48 in)
AS/NZS 3679.1 300
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2700–2700 mm (106.3–106.3 in)
On M-EX Right Now
GB/T 1591 Q345B
2 active listings and RFQs →
AS/NZS 3679.1 300
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q345B and AS/NZS 3679.1 300?
GB/T 1591 Q345B specifies V, Nb, Ti which are not specified for AS/NZS 3679.1 300.
Can GB/T 1591 Q345B be substituted with AS/NZS 3679.1 300?
GB/T 1591 Q345B and AS/NZS 3679.1 300 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.