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AS/NZS 3678 Grade 300 vs AS/NZS 3679.1 350

Close Alternative — 70.9% match based on chemical composition and mechanical property overlap.

AS/NZS 3678 Grade 300 (AS/NZS 3678:2016) and AS/NZS 3679.1 350 (AS/NZS 3679.1:2016) 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 3679.1 350 is commonly used for hot-rolled structural bars and sections for primary structural beams, columns, and framing. AS/NZS 3678 Grade 300 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand, while AS/NZS 3679.1 350 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 3679.1 350 is a 100% match. As per mechanical properties, the match is 12.7%. Combined, this makes them a close alternative overall at 70.9%.

Frequently Compared With AS/NZS 3678 Grade 300:
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 ASTM A572 Gr.65
Match Breakdown
CHEMISTRY MATCH
100%
MECHANICAL MATCH
12.7%
OVERALL
70.9%
Specifications
Property AS/NZS 3678 Grade 300 AS/NZS 3679.1 350
Standard AS/NZS 3678:2016 AS/NZS 3679.1:2016
Category Structural Steel Structural Steel
C (%) <=0.22 <=0.22
Mn (%) <=1.70 <=1.70
Si (%) <=0.50 <=0.50
P (%) <=0.040 <=0.040
S (%) <=0.040 <=0.040
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 3679.1 350
Tensile Strength 430-560 MPa 480-640 MPa
Yield Strength 300 MPa min 350 MPa min
Elongation 22% min 20% min
Typical Applications
AS/NZS 3678 Grade 300
General fabrication, structural members, high-rise buildings, bridges, storage tanks
AS/NZS 3679.1 350
Hot-rolled structural bars and sections for primary structural beams, columns, and framing
Can AS/NZS 3678 Grade 300 Be Substituted With AS/NZS 3679.1 350?
AS/NZS 3678 Grade 300 and AS/NZS 3679.1 350 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
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 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
AS/NZS 3678 Grade 300
2 active listings and RFQs →
AS/NZS 3679.1 350
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AS/NZS 3678 Grade 300 and AS/NZS 3679.1 350?
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 3679.1 350?
AS/NZS 3678 Grade 300 and AS/NZS 3679.1 350 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.