GB/T 1591 H-Beam Steel Q355 Structural Construction

Rail & Fittings, Steel Rail

GB/T 1591 H-Beam Steel Q355 Structural Construction

GB/T 1591 H-Beam Steel Q355B represents China’s premium-grade low-alloy high-strength structural steel, manufactured in strict compliance with the GB/ T 1591-2018 national standard. This hot-rolled H-section steel offers superior mechanical properties for demanding construction applications.

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Product Detail

Chemical Component

Product Details

Category	Specification
Product name	GB/T 1591 H-Beam Steel Q355B Structural Construction
Standard	GB/T1591-2018(China)
Grade	Q355B
Common Sizes
-HW(Wide Flange)	100x100mm to 400x400mm
-HM(Medium Flange)	1 50x100mm to 600x300mm
-HN(Narrow Flange)	100x50mm to 900x300mm
Surface Quality	Free fromcracks,scars,andharmful defects
Tolerances	Complies with GB/T11263 Class 1(Higherprecision)
Applications	High-rise buildings,bridges,industrial plants ,heavy machinery frameworks

Symbol description:

H-Height;

B-Width;

t₁–Thickness of the abdominal plate;

t₂–Wing edge thickness;

r–radius of circle;

X-X — horizontal axis of gravity;

Y-Y — vertical axis of gravity.

Chemical Component

Mark		Chemical Composition (mass fraction)/%
Grade Steel	Quality Grade	C^a		Si	Mn	P^C	S^C	Nb^d	V^e	Ti^e	Cr	Ni	Cu	Mo	N^f	B
		The following nominal thickness or diameter is in mm		Not much more than that
		≤40^b	＞40
		Not much more than that
Q355	B	0 .24		0 .55	1 .60	0 .035	0 .035	—	—	—	0 .30	0 .30	0 .40	—	0 .012	—
	C	0 .20	0 .22			0 .030	0 .030
	D	0 .20	0 .22			0 .025	0 .025								—
Q390	B	0 .20		0 .55	1 .70	0 .035	0 .035	0 .05	0 .13	0 .05	0 .30	0 .50	0 .40	0 .10	0 .015	—
	C					0 .030	0 .030
	D					0 .025	0 .025
Q420^g	B	0 .20		0 .55	1 .70	0 .035	0 .035	0 .05	0 .13	0 .05	0 .30	0 .80	0 .40	0 .20	0 .015	—
	C					0 .030	0 .030
Q460^g	C	0 .20		0 .55	1 .80	0 .030	0 .030	0 .05	0 .13	0 .05	0 .30	0 .80	0 .40	0 .20	0 .015	0 .004
a For steel sections with nominal thickness greater than 100 mm, the carbon content may be determined by both parties through negotiation. b Steel with nominal thickness greater than 30 mm, carbon content not greater than 0.22%. c For steel sections and bars, the upper limit of phosphorus and sulfur content can be increased by 0.005%. d Q390 and Q420 can reach up to 0.07%, and Q460 can reach up to 0.11%. e It can go up to 0.20%. f If the content of acid soluble aluminum Als in steel is not less than 0.015%, or the content of all aluminum Alt is not less than 0.020%, or other solid nitrogen alloy elements are added, the content of nitrogen is not limited, and the solid nitrogen elements should be indicated in the quality certificate. g Only applicable to sections and bars.