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AS/NZS 3678 Grade 300 vs AS/NZS 3678 Grade 450

Strong Match — 96.9% match based on chemical composition and mechanical property overlap.

AS/NZS 3678 Grade 300 (AS/NZS 3678:2016) and AS/NZS 3678 Grade 450 (AS/NZS 3678:2016) are both steel grades. Both fall under the Structural Steel category. AS/NZS 3678 Grade 300 is typically used for general fabrication, structural members, high-rise buildings, bridges, storage tanks, while AS/NZS 3678 Grade 450 is commonly used for heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.. AS/NZS 3678 Grade 300 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand, while AS/NZS 3678 Grade 450 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand.

As per chemical composition, AS/NZS 3678 Grade 300 vs AS/NZS 3678 Grade 450 is a 96.9% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a strong match overall at 96.9%.

Frequently Compared With AS/NZS 3678 Grade 300:
AS/NZS 3679.1 350 AS/NZS 3679.1 300 CSA G40.21 480W ASTM A1008 SS Grade 80 CSA G40.21 400W GOST 19281 09G2S CSA G40.21 260W CSA G40.21 300W ASTM A1008 SS Grade 50 CSA G40.21 400A CSA G40.21 350W ASTM A283C
Match Breakdown
CHEMISTRY MATCH
96.9%
MECHANICAL MATCH
No shared data
OVERALL
96.9%
Specifications
Property AS/NZS 3678 Grade 300 AS/NZS 3678 Grade 450
Standard AS/NZS 3678:2016 AS/NZS 3678:2016
Category Structural Steel Structural Steel
C (%) <=0.22 max 0.2
Mn (%) <=1.70 max 1.6
Si (%) <=0.50 max 0.55
P (%) <=0.040 max 0.03
S (%) <=0.040 max 0.03
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property AS/NZS 3678 Grade 300 AS/NZS 3678 Grade 450
Tensile Strength 430-560 MPa Not specified
Yield Strength 300 MPa min Not specified
Elongation 22% min Not specified
Typical Applications
AS/NZS 3678 Grade 300
General fabrication, structural members, high-rise buildings, bridges, storage tanks
AS/NZS 3678 Grade 450
Heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.
Can AS/NZS 3678 Grade 300 Be Substituted With AS/NZS 3678 Grade 450?
AS/NZS 3678 Grade 300 and AS/NZS 3678 Grade 450 overlap closely enough on chemistry and mechanical properties that AS/NZS 3678 Grade 450 is often considered as a substitute for AS/NZS 3678 Grade 300 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.
Forms & Sizes Available on M-EX
AS/NZS 3678 Grade 300
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2500–3100 mm (98.43–122.05 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
AS/NZS 3678 Grade 300
2 active listings and RFQs →
AS/NZS 3678 Grade 450
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AS/NZS 3678 Grade 300 and AS/NZS 3678 Grade 450?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can AS/NZS 3678 Grade 300 be substituted with AS/NZS 3678 Grade 450?
AS/NZS 3678 Grade 300 and AS/NZS 3678 Grade 450 overlap closely enough on chemistry and mechanical properties that AS/NZS 3678 Grade 450 is often considered as a substitute for AS/NZS 3678 Grade 300 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.