CSA G40.21 GRADE 350W STEEL HOLLOW SECTION

Product Introduction

CSA G40.21 GRADE 350W STEEL HOLLOW SECTION is a hollow square section steel tube with a square section shape and size made of hot-rolled or cold-rolled coils, which are formed by cold bending and high-frequency welding. The section produced by the seamless process or automatic electric welding process is cold-formed to produce a continuous weld. CSA G40.21 GRADE 350W STEEL HOLLOW SECTION is of high quality, has complete specifications, and adopts new crafts and new technologies. We have fast delivery and sufficient inventory.

CSA G40.21 is a Canadian standard that specifies the requirements for structural quality steel products, including hollow sections. Grade 350W steel is a type of high-strength steel that is commonly used in construction projects due to its excellent properties in terms of durability, toughness, and resistance to corrosion.

Hollow sections are a popular choice for structural applications due to their lightweight, high strength-to-weight ratio, and ease of installation. CSA G40.21 Grade 350W steel hollow sections are designed to meet specific mechanical and chemical requirements, including minimum yield and tensile strengths, elongation, and chemical composition.

These hollow sections are available in a range of shapes, including square, rectangular, and round, and are typically used in applications such as bridges, buildings, and other heavy-duty structures. They are manufactured to precise specifications and undergo rigorous testing to ensure they meet the highest standards of quality and safety.

CSA G40.21 GRADE 350W CLASS C HOLLOW SECTION

	Specification	G 40.21
	Strength Levels	50W/350W
	Yield Strength	350MPA min
	Tensile Strength	450-620 Mpa
	Elongatin % in 2”	22min
	Carbon	0.23max
	Mn	0.50-1.50
	P	0.040max
	S	0.050max
	Si	0.40max

CSA G40.21 GRADE 350W CLASS H HOLLOW SECTION

What's the difference between  CSA 40.21 Grade 350W CLASS H  HOLLOW SECTION and  CSA 40.21 Grade 350W CLASS C HOLLOW SECTION?

According to CSA, Hollow sections-welded or seamless round, square, or special profile structural tubing is available in two classes:
Class C ---hollow sections that are Cold-formed from a section produced either by a seamless process or by an automatic electric-welding process producing a continuous weld.
Class H ----hollow sections made by a seamless(i)or furnace butt welding (continuous welding) or automatic electric-welding process, and hot-formed to final shape; or (ii) automatic electric-welding process producing a continuous weld, and cold-formed to final shape; subsequently stress relieved by heating to a temperature of 450 °C or higher; followed by cooling in air. 

 Which size we can produce Hollow Sections?

Yuantai has 76 producing lines and ten thousand molds of hollow sections, any size can be customized as requested. size tolerance as CSA G40.21 350W.

Which size of hollow sections shall be released tension?

(i)Common size of hollow sections is formed from coils under room temperature, in this case, the common size of the hollow section doesn't need heat treatment.

(ii)Normally to see, it needs heat treatment for the thickness above 20mm or a special higher thickness for small sizes. 

The heat treatment will be advised for these sizes before quoting and producing process, to guarantee the quality and steel performance.

(iii)if anything against if need heat treatment before you use hollow sections, we can answer you first as a reference.

(iv) pls be noted, it needs test the strength level and chemical level before heat treatment.

What about exporting to Canada? 

Quite skilled and professional workers will give the best service and guarantee on the packings! 

It has 2 kinds of packing, and it's mandatory to talk directly with us or send a mail for inquiry.

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