SS400 Hollow Section

 

SS400 hollow tube is a Japanese standard carbon structural steel tube. "S" stands for steel, and the second "S" indicates "structure". The number 400 denotes a minimum tensile strength of 245 MPa, with the overall designation indicating a general structural steel tube with a tensile strength of 400 MPa.

SS400 Square And Rectangular Carbon Steel Tube Specification

Specification	Size	20*20-500*500mm, 20*30-400*600mm
	Thickness	1.3-40mm
	Length	customized
Technique	ERW
Standard	JIS SS400 (GB Q235)
Application	Steel structure, or other industry
Package	in bundle
Lead Time	20-25 days for new production
Loading Port	Xingang, Tianjin, China
MOQ	10 tons
Others	as per the discussion with the clients.

SS400 Carbon Hollow Section

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

What affects the outer diameter accuracy of square and rectangular tubes?

• The mold opening method for large-diameter square and rectangular tubes is a critical factor in managing the standard tolerances of their diameters. For longitudinally rolled large-diameter square and rectangular tubes, the outer diameter accuracy can reach about 1%, while for oblique rolled large-diameter square and rectangular tubes, the high outer diameter accuracy is ensured to be within 0.5%.
• The production process management system significantly influences the diameter accuracy of large-diameter square and rectangular tubes. Management decisions on the diameter of large-diameter square and rectangular tube sizing machines depend on the stability of the hot rolling temperature and temperature. With an increase in the hot rolling temperature of large-diameter square and rectangular tubes, there is greater shrinkage after rolling, which can easily exceed the diameter, resulting in a negative deviation.
• Conversely, a low hot rolling temperature may lead to exceeding the positive deviation, resulting in defects. Therefore, adjustments to the continuous extrusion of large-diameter square and rectangular tubes must be continually made based on the specifications of the mold openings, the size of large-diameter square and rectangular tubes, temperature conditions, and the occurrence of common tool damage.

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