AS/NZS 3678:2016· Australia & New Zealand

Grade 350

Australian and New Zealand plate grade: 360 MPa yield up to 12 mm, 450 MPa minimum tensile.

Compared with S355 on its equivalents table.

Nominal thicknessmm

Yield strength ReH: ≥ 350MPa
Corroborated12–20 mm
Tensile strength Rm: ≥ 450MPa
Corroborated
Elongation after fracture A: ≥ 20%
Single source10–25 mm · L₀ = 5.65√S₀

All values

Strength

Yield strength ReH

Upper yield strength guaranteed by the product standard (minimum).

Condition	Value	Evidence
	≥ 360MPa	Corroborated
	≥ 350MPa	Corroborated
	≥ 340MPa	Corroborated

Tensile strength Rm

Ultimate tensile strength. Product standards give a range or a minimum.

Condition	Value	Evidence
	≥ 450MPa	Corroborated

Ductility

Elongation after fracture A

Minimum elongation; depends on gauge length and test direction.

Condition	Value	Evidence
	≥ 20%	Single source

Chemical composition

Show on the periodic table

Grade 350 plate, expected maximum, % by mass (NZ Steel, referring to AS/NZS 3678)

Element	Applies to	Max %	Evidence
C	all thicknesses	0.22	Single source
Si	all thicknesses	0.30	Single source
Mn	all thicknesses	1.70	Single source
P	all thicknesses	0.040	Single source
S	all thicknesses	0.030	Single source
V	all thicknesses	0.10	Single source

Listed as equivalent to

S355 (EN 10025-2:2019) — Yield bands differ (360 MPa up to 12 mm, then 350 and 340). Minimum tensile 450 MPa, below S355's 470.

Not yet verified for this grade

Yield above 50 mm

Missing on purpose: a value appears here only once a public source states it.

Sources here are public pages that reproduce AS/NZS 3678:2016. For design and acceptance, the standard edition named in your specification and the inspection certificate (EN 10204 3.1) of the delivered product take precedence.