A573 Grade 70 steel is a kind of structual carbon steel plates of improved toughness which intended primarily for service at atmospheric temperatures where improved notch toughness is important.
This ASTM A573 specification mainly according to A6/A6M which for general requirements for rolled steel plates,shapes,sheet piling,and bars for structural use. It applies to high-strength steel plates with a thickness of 8mm to 25mm for pressure vessel manufacturing.
A573 Grade 70 carbon steel’s properties
The A573 Grade 70 carbon steel plate has good low temperature impact toughness, excellent welding performance and resistance to hydrogen sulfide stress corrosion. Multiple and trace additions of strong carbonitride forming elements (Nb, V, Ti), different elements 'compete' to combine C and N atoms to form small and dispersed precipitated phases, such as Nb or V-based composites Type carbonitride, the strong 'pinning' effect of the fine precipitated phase effectively hinders the dislocation movement and has a 'synergistic precipitation strengthening effect' on the hot-rolled steel sheet; if only a certain microalloying element is added alone, its content increases It is bound to coarsen the precipitated phase, which will not increase the strength significantly and will deteriorate the toughness. At the same time, the strong addition of strong carbonitride and other replacement elements such as Mn and Mo will help improve the hardenability and synergy of the Q690CF steel plate. Promote bainite transformation. According to the requirements of the purchaser, after consultation between the supplier and the purchaser, steel plates with a thickness of more than 16mm can be heat treated for mechanical properties. The steel has good cold crack resistance. Electrode arc welding preheating above 75 ℃, submerged arc automatic welding preheating above 50 ℃, and gas shielded welding preheating above 100 ℃ can prevent the occurrence of cold cracks.
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