300 - AS /NZS 3679-1-1996

Grade	300
Corresponding Standard	AS /NZS 3679-1-1996 Part 1: Hot-Rolled Bars and Sections
Classification	Carbon Steel

300 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	Ti ^②	V ^②	Nb ^②	Al ^①	More
Minimum Value	-	-	-	-	-	-	-	-	-	-	-	-	-	Cu+Ni+Cr+Mo≤1；Nb+V≤0.03
Maximum Value	0.25	0.5	1.6	0.04	0.04	0.3	0.5	0.5	0.1	0.04	0.03	0.02	0.15	Cu+Ni+Cr+Mo≤1；Nb+V≤0.03

①Grain refining elements, i.e. aluminium and titanium may be added, provided that the total content does not exceed 0.15%. Limits are for total or soluble aluminium.
②Micro-alloying except in thicknesses greater than or equal to 15 mm, the element Ti+Nb+V≤0.15%；Where micro-alloying elements are used, the percentage of each element is to be shown on the certificates.
③Carbon equivalent CE≤0.44

300 Mechanical Properties

thickness t mm	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %
Flat steel, section steel; t<11	≥440	≥320	≥22①
Flat steel, section steel; 11≤t<17	≥440	≥300	≥22①
Flat steel, section steel; 17≤t<40	≥440	≥280	≥22①
Flat steel, section steel; t≥40	≥440	≥280	≥22①
Hexagonal steel, round steel, square steel; t≤50	≥440	≥300	≥22①
hexagons,rounds,squares；50＜t≤100	≥440	≥290	≥22①
Hexagonal steel, round steel, square steel; t≥100	≥440	≥280	≥22①

300 Corresponding Standards(Same grade name, different standards)

1	GB 2100-1980
	300 ZG00Cr14Ni14Si4 C4
2	AS /NZS 3678-2016
	300
3	AS /NZS 3679-1-1996
	300

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