AS3678-300 AS3678-350 Metal Beam

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AS3678-300 AS3678-350 Steel Girder

 

 

AS3678-300 belongs to the Australian standard low-alloy high-strength steel, "AS3678" is the Australian standard number of the steel, "300" is the same as the national standard low-alloy structural steel, indicating the yield strength of steel plate value, the unit is "MPa".

 

AS3678-300 is mainly used in buildings that require low to medium strength carbon steel, such as floor slabs and bridge construction, etc.

 

AS3678-300 structural steel beam is produced by hot rolling, with a nominal small yield strength of 300MPa and good ductility.

 

AS3678-300 steel processing method: generally used flame cutting processing method, but if the requirements are high can be used plasma cutting method.

 

Mechanical properties of AS3678-300 steel: yield strength ≥250MPa; tensile strength ≥410MPa; elongation 21%.

 

AS3678-350 is a low alloy high-strength steel, the implementation of the Australian Standard AS3678-1996. 350" in AS3678-350 represents the yield strength.

 

AS3678-350 performance requirements
(1)High strength: generally its yield strength is more than 300MPa.
(2) high toughness: the requirements of the elongation of 15% ~ 20%, room temperature impact toughness greater than 600kJ / m ~ 800k / m. For large welded components, the requirements of a high fracture toughness
(3) good welding performance and cold forming properties
(4) low cold brittle transition temperature
(5) good corrosion resistance.

 

AS3678-350 alloy steel composition characteristics
(1)AS3678-350 beam h low carbon: due to the high requirements of toughness, weldability and cold forming properties, its carbon content does not exceed 0.20%.
(2) AS3678-350 beam steel adds manganese-based alloying elements.
(3) AS3678-350 steel beams add niobium, titanium or vanadium and other co-elements: a small amount of niobium, titanium or vanadium in the steel to form a fine carbide or carbon-nitride, is conducive to obtaining a fine ferrite grain and improve the strength and toughness of steel.

 

In addition, adding a small amount of copper (≤ 0.4%) and phosphorus (0.1% or so), etc., can improve corrosion resistance. Add a small amount of rare earth elements, can be desulfurized, de-gassing, so that the steel purification, improve toughness and process performance.

 

China H shaped steel Factory--GNEE Group

 

 

AS3678-300 AS3678-350 steel beam h chemical composition:

Grade	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	Ti
AS3678-300	≤0.22	≤0.55	≤1.70	≤0.040	≤0.030	≤0.30	≤0.50	≤0.40	≤0.10	≤0.040
AS3678-350	≤0.22	≤0.55	≤1.70	≤0.35	≤0.40	≤0.30	≤0.50	≤0.40	≤0.35	≤0.040

 

China H column steel Distributors--GNEE Group

 

 

GNEE Steel is a professional enterprise specialized in high quality steel. Our company has passed ISO quality system certification. Our company was founded in 2008. Based on the concept of "credibility creates brand", we have established good cooperative relationship with many overseas customers. In the spirit of "honesty, professionalism, cooperation and mutual benefit", the company gradually builds a perfect industrial chain system to provide customers around the world with high-quality products and perfect after-sales service.

 

China Structural Steel Beams Distributors--GNEE Group

 

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