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ASTM A572 Gr.65 vs AS/NZS 3678 Grade 450

Strong Match — 90.8% match based on chemical composition and mechanical property overlap.

ASTM A572 Gr.65 (ASTM A572) and AS/NZS 3678 Grade 450 (AS/NZS 3678:2016) are both steel grades. Both fall under the Structural Steel category. ASTM A572 Gr.65 is typically used for used for bridges, buildings, transmission towers, construction equipment, offshore structures, and structural members., while AS/NZS 3678 Grade 450 is commonly used for heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.. ASTM A572 Gr.65 is defined under ASTM International, originating from United States, while AS/NZS 3678 Grade 450 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand.

As per chemical composition, ASTM A572 Gr.65 vs AS/NZS 3678 Grade 450 is a 90.8% 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 90.8%.

Frequently Compared With ASTM A572 Gr.65:
ASTM A572 Grade 50 ASTM A283C CSA G40.21 300W CSA G40.21 350W CSA G40.21 400W GOST 19281 09G2S CSA G40.21 260W AS/NZS 3679.1 300 CSA G40.21 480W AS/NZS 3679.1 350 AS/NZS 1595 C450 ASTM A1008 SS Grade 50
Match Breakdown
CHEMISTRY MATCH
90.8%
MECHANICAL MATCH
No shared data
OVERALL
90.8%
Specifications
Property ASTM A572 Gr.65 AS/NZS 3678 Grade 450
Standard ASTM A572 AS/NZS 3678:2016
Category Structural Steel Structural Steel
C (%) 0.23 max max 0.2
Mn (%) 1.35 max max 1.6
Si (%) 0.40 max max 0.55
V (%) 0.15 max Not specified
Nb (%) 0.05 max Not specified
P (%) 0.040 max max 0.03
S (%) 0.050 max 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 ASTM A572 Gr.65 AS/NZS 3678 Grade 450
Tensile Strength 550-690 MPa Not specified
Yield Strength 450 MPa min Not specified
Elongation 18-21% Not specified
Hardness 170-220 HB Not specified
Typical Applications
ASTM A572 Gr.65
Used for bridges, buildings, transmission towers, construction equipment, offshore structures, and structural members.
AS/NZS 3678 Grade 450
Heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.
Key Differences
Can ASTM A572 Gr.65 Be Substituted With AS/NZS 3678 Grade 450?
ASTM A572 Gr.65 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 ASTM A572 Gr.65 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
ASTM A572 Gr.65
Plate → (4 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2600–4400 mm (102.36–173.23 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
ASTM A572 Gr.65
4 active listings and RFQs →
AS/NZS 3678 Grade 450
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between ASTM A572 Gr.65 and AS/NZS 3678 Grade 450?
ASTM A572 Gr.65 specifies V, Nb which are not specified for AS/NZS 3678 Grade 450.
Can ASTM A572 Gr.65 be substituted with AS/NZS 3678 Grade 450?
ASTM A572 Gr.65 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 ASTM A572 Gr.65 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.