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AS/NZS 1594 HA350 vs AS/NZS 3678 Grade 400

Related Material — 66.7% match based on chemical composition and mechanical property overlap.

AS/NZS 1594 HA350 (AS/NZS 1594:2025) and AS/NZS 3678 Grade 400 (AS/NZS 3678:2016) are both steel grades. Both fall under the Structural Steel category. AS/NZS 1594 HA350 is typically used for automotive structural parts, trailers, agricultural equipment, general fabrication, light structural sections., while AS/NZS 3678 Grade 400 is commonly used for heavy structural fabrication, crane booms, mining machinery, earthmoving equipment, structural columns.. AS/NZS 1594 HA350 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand, while AS/NZS 3678 Grade 400 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand.

As per chemical composition, AS/NZS 1594 HA350 vs AS/NZS 3678 Grade 400 is a 100% match. As per mechanical properties, the match is 0%. Combined, this makes them a related material overall at 66.7%.

Frequently Compared With AS/NZS 1594 HA350:
AS/NZS 1595 C350 AS/NZS 1595 C450 IS 2062 E250B0 CSA G40.21 300W IS 2062 E250A AS/NZS 3679.1 350 AS/NZS 3679.1 300 ASTM A1008 SS Grade 80 ASTM A1008 SS Grade 50 CSA G40.21 400A ASTM A283C ASTM A572 Gr.65
Match Breakdown
CHEMISTRY MATCH
100%
MECHANICAL MATCH
0%
OVERALL
66.7%
Specifications
Property AS/NZS 1594 HA350 AS/NZS 3678 Grade 400
Standard AS/NZS 1594:2025 AS/NZS 3678:2016
Category Structural Steel Structural Steel
C (%) max 0.2 max 0.2
Mn (%) max 1.6 max 1.6
Si (%) max 0.55 max 0.55
P (%) max 0.03 max 0.03
S (%) max 0.03 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 1594 HA350 AS/NZS 3678 Grade 400
Yield Strength 350 MPa min (AS/NZS 1594) 400 MPa min (t<=12mm)
Tensile Strength Not specified ~520 MPa min (approx, equivalent to ASTM A572 Gr.60)
Typical Applications
AS/NZS 1594 HA350
Automotive structural parts, trailers, agricultural equipment, general fabrication, light structural sections.
AS/NZS 3678 Grade 400
Heavy structural fabrication, crane booms, mining machinery, earthmoving equipment, structural columns.
Can AS/NZS 1594 HA350 Be Substituted With AS/NZS 3678 Grade 400?
AS/NZS 1594 HA350 and AS/NZS 3678 Grade 400 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 1594 HA350
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3100–3600 mm (122.05–141.73 in)
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)
On M-EX Right Now
AS/NZS 1594 HA350
2 active listings and RFQs →
AS/NZS 3678 Grade 400
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AS/NZS 1594 HA350 and AS/NZS 3678 Grade 400?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can AS/NZS 1594 HA350 be substituted with AS/NZS 3678 Grade 400?
AS/NZS 1594 HA350 and AS/NZS 3678 Grade 400 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.