No. 45 steel is commonly used medium carbon quenched and tempered structural steel. The cold plasticity of No. 45 steel is generally better than Comparison of SA572 Gr.50 and S355N steel. Annealing and normalizing are better than quenching and tempering. No. 45 steel has higher strength and better machinability than Q345 steel. After proper heat treatment, it can obtain certain toughness, plasticity and wear resistance. No. 45 steel Comparison of SA572 Gr.50 and S355N steel is suitable for hydrogen welding and argon arc welding, but not suitable for gas welding. Preheating is required before welding, and stress relief annealing shall be conducted after welding.
ASTM A537 are primarily intended for fusion welded pressure vessels and structures. Steel plates under this Comparison of SA572 Gr.50 and S355N steel specification are available in three classes classified according to the different heat treatment: Class 1 (normalized), Class 2 (quenched and tempered) and Class 3 (quenched and tempered). The maximum thickness of plates furnished under this specification is 4 in. [100mm] for Class 1 and 6 in. [150mm] for Class 2 and Class 3.
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