Post Stock Login Register

GB/T 1591 Q345B vs AS/NZS 3678 Grade 450

Close Alternative — 84.9% match based on chemical composition and mechanical property overlap.

GB/T 1591 Q345B (GB/T 1591-2018) and AS/NZS 3678 Grade 450 (AS/NZS 3678:2016) 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 3678 Grade 450 is commonly used for heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.. GB/T 1591 Q345B is defined under Guobiao Standards (GB/T), originating from China, while AS/NZS 3678 Grade 450 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 3678 Grade 450 is a 84.9% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a close alternative overall at 84.9%.

Frequently Compared With GB/T 1591 Q345B:
CSA G40.21 300W CSA G40.21 480W GOST 19281 09G2S CSA G40.21 400W CSA G40.21 260W CSA G40.21 400A AS/NZS 3679.1 300 CSA G40.21 350W ASTM A1008 SS Grade 50 AS/NZS 3679.1 350 ASTM A572 Grade 50 ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
84.9%
MECHANICAL MATCH
No shared data
OVERALL
84.9%
Specifications
Property GB/T 1591 Q345B AS/NZS 3678 Grade 450
Standard GB/T 1591-2018 AS/NZS 3678:2016
Category Structural Steel Structural Steel
C (%) <=0.20 max 0.2
Si (%) <=0.50 max 0.55
Mn (%) 1.00-1.60 max 1.6
S (%) <=0.035 max 0.03
P (%) <=0.035 max 0.03
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 3678 Grade 450
Tensile Strength 470-630 MPa Not specified
Yield Strength >=345 MPa Not specified
Elongation >=21% Not specified
Impact Energy >=34 J Not specified
Typical Applications
GB/T 1591 Q345B
bridges, construction equipment, cranes, heavy structures, pressure vessels, machinery
AS/NZS 3678 Grade 450
Heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.
Key Differences
Can GB/T 1591 Q345B Be Substituted With AS/NZS 3678 Grade 450?
GB/T 1591 Q345B and AS/NZS 3678 Grade 450 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
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 3678 Grade 450
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2500–4200 mm (98.43–165.35 in)
On M-EX Right Now
GB/T 1591 Q345B
2 active listings and RFQs →
AS/NZS 3678 Grade 450
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between GB/T 1591 Q345B and AS/NZS 3678 Grade 450?
GB/T 1591 Q345B specifies V, Nb, Ti which are not specified for AS/NZS 3678 Grade 450.
Can GB/T 1591 Q345B be substituted with AS/NZS 3678 Grade 450?
GB/T 1591 Q345B and AS/NZS 3678 Grade 450 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.