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AS/NZS 3678 Grade 400 vs ASTM A572 Grade 50

Related Material — 60.5% match based on chemical composition and mechanical property overlap.

AS/NZS 3678 Grade 400 (AS/NZS 3678:2016) and ASTM A572 Grade 50 (ASTM A572) are both steel grades. Both fall under the Structural Steel category. AS/NZS 3678 Grade 400 is typically used for heavy structural fabrication, crane booms, mining machinery, earthmoving equipment, structural columns., while ASTM A572 Grade 50 is commonly used for high-strength low-alloy structural steel; buildings, bridges, transmission towers, construction equipment, general structural fabrication. AS/NZS 3678 Grade 400 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand, while ASTM A572 Grade 50 is defined under ASTM International, originating from United States.

As per chemical composition, AS/NZS 3678 Grade 400 vs ASTM A572 Grade 50 is a 90.8% match. As per mechanical properties, the match is 0%. Combined, this makes them a related material overall at 60.5%.

Frequently Compared With AS/NZS 3678 Grade 400:
AS/NZS 1595 C450 AS/NZS 3679.1 300 AS/NZS 1595 C350 AS/NZS 3679.1 350 IS 2062 E250A IS 2062 E250B0 ASTM A1008 SS Grade 50 ASTM A1008 SS Grade 80 ASTM A283C CSA G40.21 300W ASTM A572 Gr.65 CSA G40.21 400A
Match Breakdown
CHEMISTRY MATCH
90.8%
MECHANICAL MATCH
0%
OVERALL
60.5%
Specifications
Property AS/NZS 3678 Grade 400 ASTM A572 Grade 50
Standard AS/NZS 3678:2016 ASTM A572
Category Structural Steel Structural Steel
C (%) max 0.2 <=0.23
Mn (%) max 1.6 <=1.35
Si (%) max 0.55 <=0.40
P (%) max 0.03 <=0.040
S (%) max 0.03 <=0.050
Nb (%) Not specified <=0.05
V (%) Not specified <=0.15
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 400 ASTM A572 Grade 50
Yield Strength 400 MPa min (t<=12mm) 345 MPa min
Tensile Strength ~520 MPa min (approx, equivalent to ASTM A572 Gr.60) 450 MPa min
Elongation Not specified 18% min
Hardness Not specified 137-187 HB
Typical Applications
AS/NZS 3678 Grade 400
Heavy structural fabrication, crane booms, mining machinery, earthmoving equipment, structural columns.
ASTM A572 Grade 50
High-strength low-alloy structural steel; buildings, bridges, transmission towers, construction equipment, general structural fabrication
Key Differences
Can AS/NZS 3678 Grade 400 Be Substituted With ASTM A572 Grade 50?
AS/NZS 3678 Grade 400 and ASTM A572 Grade 50 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
AS/NZS 3678 Grade 400
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3000–3700 mm (118.11–145.67 in)
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)
On M-EX Right Now
AS/NZS 3678 Grade 400
2 active listings and RFQs →
ASTM A572 Grade 50
4 active listings and RFQs →
Frequently Asked Questions
What is the difference between AS/NZS 3678 Grade 400 and ASTM A572 Grade 50?
ASTM A572 Grade 50 specifies Nb, V which are not specified for AS/NZS 3678 Grade 400.
Can AS/NZS 3678 Grade 400 be substituted with ASTM A572 Grade 50?
AS/NZS 3678 Grade 400 and ASTM A572 Grade 50 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.