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ASTM A572 Grade 50 vs AS/NZS 3678 Grade 450

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

ASTM A572 Grade 50 (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 Grade 50 is typically used for high-strength low-alloy structural steel; buildings, bridges, transmission towers, construction equipment, general structural fabrication, 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 Grade 50 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 Grade 50 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 Grade 50:
ASTM A572 Gr.65 ASTM A283C GOST 19281 09G2S CSA G40.21 260W CSA G40.21 300W AS/NZS 3679.1 300 AS/NZS 3679.1 350 CSA G40.21 480W CSA G40.21 400W CSA G40.21 400A CSA G40.21 350W ASTM A1008 SS Grade 80
Match Breakdown
CHEMISTRY MATCH
90.8%
MECHANICAL MATCH
No shared data
OVERALL
90.8%
Specifications
Property ASTM A572 Grade 50 AS/NZS 3678 Grade 450
Standard ASTM A572 AS/NZS 3678:2016
Category Structural Steel Structural Steel
C (%) <=0.23 max 0.2
Mn (%) <=1.35 max 1.6
Si (%) <=0.40 max 0.55
P (%) <=0.040 max 0.03
S (%) <=0.050 max 0.03
Nb (%) <=0.05 Not specified
V (%) <=0.15 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 ASTM A572 Grade 50 AS/NZS 3678 Grade 450
Tensile Strength 450 MPa min Not specified
Yield Strength 345 MPa min Not specified
Elongation 18% min Not specified
Hardness 137-187 HB Not specified
Typical Applications
ASTM A572 Grade 50
High-strength low-alloy structural steel; buildings, bridges, transmission towers, construction equipment, general structural fabrication
AS/NZS 3678 Grade 450
Heavy cranes, offshore platforms, pressure vessels, structural members in high-rise construction, mining equipment.
Key Differences
Can ASTM A572 Grade 50 Be Substituted With AS/NZS 3678 Grade 450?
ASTM A572 Grade 50 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 Grade 50 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 Grade 50
Plate → (4 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 2800–4600 mm (110.24–181.1 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 Grade 50
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 Grade 50 and AS/NZS 3678 Grade 450?
ASTM A572 Grade 50 specifies Nb, V which are not specified for AS/NZS 3678 Grade 450.
Can ASTM A572 Grade 50 be substituted with AS/NZS 3678 Grade 450?
ASTM A572 Grade 50 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 Grade 50 in many applications. Always confirm the specific property range your application needs before substituting, and check with your supplier's mill certificate.