A588M

Characteristics of Weathering Steel

Weathering steel alloy composition and percentage weight concentration are: C:0.12~0.21, Si:0.2~2.0, Mn:0.7~2.0, s ≤ 0.036, p ≤ 0.034, Cu:0.10~0.40, Al<0.2 and the rest for Fe and trace impurities.

Through Cu, Mn, Si, Al, alloying, and simple adjustment of low carbon steel (steel Q235) part of the element content, without changing the Q235 steel, production conditions, will be able to produce a good resistance to atmospheric corrosion, mechanical properties of economic weathering steel.

A588M weathering steel is a series of low alloy steels between normal steel and stainless steel, carbon steel adds a small amount of copper, nickel and other corrosion-resistant elements, and tough, plastic with stainless steel rolling, forming, welding and cutting, abrasion, high temperature, fatigue resistance properties; weather resistance for carbon steel 2~8 double coating for carbon steel 1.5~10 times. Mainly used in railway cars, bridges, towers and other long-term use of steel exposed to the atmosphere.

Grade	Specifications（mm)		Standard
Grade	coils	Medium and heavy plate	Standard
Q235NH	1.5-19*800-1600	6-50*1600-3000	GB/T 4171-2008 or technology agreements
Q295NH	1.5-19*800-1600	6-50*1600-3000
Q355NH	1.5-19*800-1600	6-50*1600-3000
Q460NH	1.5-19*800-1600	6-50*1600-3000
Q550NH	1.5-19*800-1600	6-50*1600-3000
Q295GNH	1.5-19*800-1600
Q355GNH	1.5-19*800-1600
A606M	1.2-19*800-1600	6-50*1600-3250	ASTM A606M-2009 or technology agreements
A871M Gr60 A871M Gr65	1.2-19*800-1600	6-50*1600-3250	ASTM A871M-97 or technology agreements
A709M HPS50W	1.2-19*800-1600	6-50*1600-3250	ASTM A709M-2007 or technology agreements
A242M GrA A242M GrB A242M GrC A242M GrD	1.2-19*800-1600	6-50*1600-3250	ASTM A242M-03a or technology agreements
A588M GrA A588M GrB A588M GrC A588M GrK	1.2-19*800-1600	6-50*1600-3250	ASTM A588M-01 or technology agreements

A588M products are mainly used in cars, bridges, buildings, towers and other structures atmospheric corrosion-resistant steel sheet, strip, and also can be applied to bolted, riveted and welded structures.

Grade	Chemical composition%
Grade	C	Si	Mn	P	S	Cu	Cr	Ni
Q235NH	≤ 0.12	0.10～ 0.40	0.20～ 0.60	≤ 0.030	≤ 0.030	0.25～ 0.55	0.40～ 0.80	≤ 0.65
Q295NH	≤ 0.15	0.10～ 0.50	0.10～ 1.00	≤ 0.030	≤ 0.030	0.20～ 0.55	0.40～ 0.80	≤ 0.65
Q355NH	≤ 0.16	≤ 0.50	0.50～ 1.50	≤ 0.030	≤ 0.030	0.20～ 0.55	0.40～ 0.80	≤ 0.65
Q460NH	≤ 0.12	≤ 0.65	≤ 1.50	≤ 0.025	≤ 0.030	0.20～ 0.55	0.30～ 1.25	0.12～ 0.65
Q550NH	≤ 0.16	≤ 0.65	≤ 2.0	≤ 0.025	≤ 0.030	0.20～ 0.55	0.30～ 1.25	0.12～ 0.65
Q295GNH	≤ 0.12	0.10～ 0.40	0.20～ 0.50	0.07～ 0.12	≤ 0.020	0.25～ 0.45	0.30～ 0.65	0.25～ 0.50
Q355GNH	≤ 0.12	0.20～ 0.75	≤ 0.10	0.07～ 0.15	≤ 0.020	0.25～ 0.55	0.30～ 1.25	≤ 0.65
A606M Type 2	≤ 0.22		≤ 1.25		≤ 0.040	≥0.20
A606M Type 4	≤ 0.22		≤ 1.25		≤ 0.040	≥0.20
A871M Gr60 A871M Gr65	0.19	0.30～0.65	0.80～1.35	0.040	0.050	0.25～0.40	0.40～0.70	0.40
A709M 50W	0.19	0.80～1.25	0.30～0.65	0.040	0.050	0.25～0.40	0.40～～0.65	0.40
A242M GrA A242M GrB A242M GrC A242M GrD	0.15	-	1.00	0.15	0.050	0.20	-	-

Grade	Thicknessmm	Tensile test			180°Bending test b≥20mm
Grade	Thicknessmm	Yield strengthReL (N/mm2)	Tensile strengthRm (N/mm2)	ElongationA %	180°Bending test b≥20mm
Q235NH	≤16	≥235	360～510	≥25	d=a
	＞16～40	≥225		≥25	d=2a
	＞40～60	≥215		≥24	d=3a
Q295NH	≤16	≥295	430～560	≥24	d=a
Q295NH	＞16～40	≥285	430～560	≥24	d=2a
Q355NH	≤16	≥355	490～630	≥22	d=a
	＞16～40	≥345		≥22	d=2a
	＞40～60	≥335		≥21	d=3a
Q460NH	≤16	≥450	≥550	≤6	d=a
	＞16～40			＞6～16	d=2a
	＞40～60			＞16	d=3a
Q550NH	≤16	≥550	620～780	≤6	d=a
	＞16～40			＞6～16	d=2a
	＞40～60			＞16	d=3a
Q295GNH	≤16	≥295	430～560	≤6	d=a
	＞16～40			＞6～16	d=2a
				＞16	d=3a
Q355GNH	≤16	≥355	490～630	≤6	d=a
	＞16～40			＞6～16	d=2a
				＞16	d=3a
A606M		≥340	≥480	≥22	-
A871M Gr60		≥415	≥520	≥18	d=2.5a
A871M Gr65		≥450	≥550	≥17	d=2.5a
A709M 50W		≥345	≥485
A242M GrA A242M GrB A242M GrC A242M GrD		≥315	≥460

ASTM A588 Grade A

C	Mn	P	S	SI	Ni	Cr	Mo	Cu	V	Nb
≤0.19	0.8-1.25	≤0.04	≤0.05	0.3-0.65	≤0.04	0.4-0.65	~	0.25-0.5	0.02-0.1	~
Yield Strength Mpa		Tensile Strength Mpa		Elongation % in 200mm		Elongation % in 50mm		Thickness
≥345		≥485		18		21		less 100mm
≥315		≥460						100-125mm
≥290		≥435						125-200mm

ASTM A588 Grade B

C	Mn	P	S	SI	Ni	Cr	Mo	Cu	V	Nb
≤0.19	0.8-1.25	≤0.04	≤0.05	0.3-0.65	≤0.4	0.4-0.65	~	0.25-0.4	0.02-0.1	~
Yield Strength Mpa		Tensile Strength Mpa		Elongation % in 200mm		Elongation % in 50mm		Thickness
≥345		≥485		18		21		less 100mm
≥315		≥460						100-125mm
≥290		≥435						125-200mm

ASTM A588 Grade C

C	Mn	P	S	SI	Ni	Cr	Mo	Cu	V	Nb
≤0.15	0.8-1.25	≤0.04	≤0.05	0.15-0.5	0.25-0.5	0.5	~	0.20-0.5	0.01-0.1	~
Yield Strength Mpa		Tensile Strength Mpa		Elongation % in 200mm		Elongation % in 50mm		Thickness
≥345		≥485		18		21		less 100mm
≥315		≥460						100-125mm
≥290		≥435						125-200mm

ASTM A588 Grade K

C	Mn	P	S	SI	Ni	Cr	Mo	Cu	V	Nb
≤0.17	0.5-1.2	≤0.04	≤0.05	0.25-0.65	≤0.04	0.4-0.7	0.1	0.3-0.5	0.005-0.05	~
Yield Strength Mpa		Tensile Strength Mpa		Elongation % in 200mm		Elongation % in 50mm		Thickness
≥345		≥485		18		21		less 100mm
≥315		≥460						100-125mm
≥290		≥435						125-200mm

Note: A606M Type4 can be combined with enhanced resistance to atmospheric corrosion of alloy elements, but to ensure that weather indices greater than 6.0.

A588M weathering steel, as a new generation of advanced steel, resistant to atmospheric corrosion is 2~5 times the ordinary carbon steel, and use longer, corrosion resistance the more prominent role.Below are other related products.

S235JR

S355JR

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