What is AS3678-300 steel plate

1. Introduction to AS3678-300 Australian steel garde:

For AS3678-300 Australian grade, AS3678 is the Australian standard AS-NZS 3678-2011, 300 represents the minimum yield strength value. AS3678-300 grade is in the Australian low alloy standard, corresponding to the Chinese grade Q345B, but its composition performance is not equivalent to Q345B.

2. AS3678-300 steel plate technical standard: AS-NZS 3678-2011

3. AS3678-300 steel plate heat treatment process: hot rolling, normalizing, tempering, normalizing + tempering, quenching and tempering.

4. AS3678-300 steel plate chemical composition melting analysis:

Grade

C

Si

Mn

P

S

Cr

Ni

Cu

Mo

Al

Ti

CE

AS3678-300

≤0.22

≤0.55

≤1.70

≤0.04

≤0.030

≤0.30

≤0.5

≤0.40

≤0.10

≤0.100

≤0.04

≤0.44

5. Mechanical properties of AS3678-300 steel plate:

Grade	Yield Strength Rp0.2 MPa							Tensile Strength Rm(Mpa)	Elongation A%
	Thickness (mm)
	≤8	>8≤12	>12≤20	>20≤32	>32≤50	>50≤80	>80≤150
AS3678-300	320	310	300	280	280	270	260	430	21

Note: (1) The grades listed allow the use of modified sulfide steelmaking techniques.
(2) The maximum value of Cr+Ni+Mo should not exceed 1.00%
(3) The limit value applies to both acid-soluble aluminum and all-aluminum.
(4) The carbon equivalent CE is based on the actual smelting composition or finished product composition value, CE=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
(5) Ni+V≤0.030%
(6) V≤0.10%, Ni+V+Ti≤0.15%.