Q355B high frequency welded H beam

Q355D welded H-beam can accept punching, branch cutting, galvanizing, painting and other processes. Welded H-beams do not change the properties of the steel. Welded H-beam is also divided into: high frequency welding and submerged arc welding. The advantage is that it can be processed, designed and combined at will with the project, and special specifications can be manufactured to meet the actual needs of special projects. Q355DH steel specifications are economically designed, and its section moment, section coefficient, pressure resistance and load bearing are much higher than those of hot rolled steel of the same unit weight.

Q355D welded H-beam: The metal core covered by the skin in the welding rod is called the weld core. The core is generally a steel wire with a certain length and diameter.

When welding H-beam, the core has two roles: one is to conduct the welding current and produce an arc to convert electrical energy into heat, and the second is the core itself melts as the filler metal and liquid base metal fusion to form a weld.
 

Chemical Composition (Hot rolled)

Hot rolled steel chemical composition based on heat analysis.

Chemical Composition (Heat Analysis), %, ≤
Steel Grade	Quality Grade	C	Si	Mn	P	S	Cr	Ni	Cu	N
Q355	Q355B	0.24	0.55	1.6	0.035	0.035	0.30	0.30	0.40	0.012
	Q355C	0.20			0.030	0.030				0.012
	Q355D	0.20			0.025	0.025				–

Note: For quality grades C & D, Carbon content (C)-

• C ≤0.20% when thickness/diameter ≤40mm (1.57 in.);
• C ≤0.22 when thickness/dia. >40mm (1.57 in.);

Normalized or normalized rolled steel

Chemical Composition (Heat Analysis), %
Steel Grade	Quality Grade	C, ≤	Si, ≤	Mn	P, ≤	S, ≤	Cr, ≤	Ni, ≤	Cu, ≤	Mo, ≤	N, ≤	Nb	V	Ti	Al, ≥
Q355N	Q355NB	0.20	0.5	0.90-1.65	0.035	0.035	0.30	0.50	0.40	0.10	0.015	0.005-0.05	0.01-0.12	0.006-0.05	0.015
	Q355NC	0.20			0.030	0.030
	Q355ND	0.20			0.030	0.025
	Q355NE	0.18			0.025	0.020
	Q355NF	0.16			0.020	0.010

Thermomechanically rolled steel

Chemical Composition (Heat Analysis), %
Steel Grade	Quality Grade	C, ≤	Si, ≤	Mn, ≤	P, ≤	S, ≤	Cr, ≤	Ni, ≤	Cu, ≤	Mo, ≤	N, ≤	Nb	V	Ti	Al, ≥
Q355M	Q355MB	0.14	0.5	1.60	0.035	0.035	0.30	0.50	0.40	0.10	0.015	0.01-0.05	0.01-0.10	0.006-0.05	0.015
	Q355MC				0.030	0.030
	Q355MD				0.030	0.025
	Q355ME				0.025	0.020
	Q355MF				0.020	0.010

Notes:

• For bars and sections, the P and S content can be 0.005% higher.
• For Ti content, can be up to 0.20%.

1.Q: Are you a factory or trading company?
A: We are professional manufacturer, and our company also is a very professional a trade company for steel products.We can provide a wide range of steel products. 
2.Q:What do your factory do regarding quality control?
A: We have obtained ISO, CE and other certifications. From materials to products, we check every process to maintain good quality.
3.Q: Can I get samples before order ?
A: Yes, of course. Usually our samples are free. we can produce by your samples or technical drawings.
4.Q:How do you make our business long-term and good relationship?
A:We keep good quality and competitive price to ensure our customers benefit ; We respect every customer as our friend and we sincerely do business and make friends with them. No matter where they come from.
5.Q:what is your delivery time ?
A: Our delivery time is about one week, timing according to the number of customers.