Q415NH low alloy steel ERW pipe OD rand(21.3,660 mm

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The difference between alloy steel plate and carbon steel has the following points. First, the hardenability of carbon steel is low, and the maximum diameter of water quenching of carbon steel is only 10 mm to 20 mm; second, the strength of carbon steel is only 235 MPa, while that of alloy steel is more than 360 MPa. Third, carbon steel has poor tempering stability. In order to ensure high strength, low tempering is used for carbon steel during quenching and tempering treatment, so the toughness of the carbon steel is insufficient. Fourth, the corrosion resistance, low heat resistance, and wear resistance of carbon steel cannot be compared with alloy steel, Q415NH low alloy steel.

A537 grade 70 steel with the thickness range is 1.2-600mm, the width range is 1220-4200mm, and the length range is 5000-18000mm. Also note that the Q415NH low alloy steel, A537 grade 70 steel coil thickness should not exceed 25 mm. The mechanical properties of A537 grade 70 steel is yield strength is 290MPa, and the tensile strength is 485-620Mpa.

As the thickness and hardness of Q415NH low alloy steel increase, the tendency to crack at the cutting edge increases. In order to prevent the Q415NH low alloy steel from cutting cracks, preheating should be carried out before Q415NH low alloy steel cutting. Special attention should be paid to preheating to make the entire Q415NH low alloy steel interface evenly heated to avoid local overheating in the area contacting the heat source. If the whole Q415NH low alloy steel cannot be preheated, the partial preheating method can be used instead.

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