The cold working performance of ASTM A588 structural steel plate and so on steel structure engineering steel is good, which can ensure that the steel will not crack or brittle fracture during high-temperature processing, and will not have a great impact on strength, plasticity and toughness due to processing. The durability of ASTM A588 structural steel plate and so on steel structure engineering steel is good. Durability refers to the service life of steel structure. The main factor affecting the service life of steel is the poor corrosion resistance of steel, followed by the deterioration of mechanical properties of steel under long-term load, repeated load and dynamic load.
The main challenges facing the current low-carbon development of the steel industry are as follows: First, insufficient energy resource endowments, coal and coke account for nearly 90% of energy input. Second, the crude steel output is relatively large, accounting for more than half of the global output. Third, there are a large number of enterprises, with more than 500 enterprises with smelting capabilities, and their structure and level are quite different. Fourth, the carbon emission mechanism is complex, involving multiple carbon emission mechanisms such as energy combustion emissions, indirect emissions corresponding to electricity and heat consumption.
Mechanical properties of 45# high quality carbon structural steel: tensile strength σb (MPA): ≥ 600 (61), yield strength σs (MPA): ≥ 355 (36), elongation δ5 (%): ≥ 16, reduction of area ψ (%): ≥ 40, impact energy Akv (J): ≥ 39, impact toughness αkv (J / cm2): ≥ 49 (5), hardness: unheated ≤ 229HB; annealed steel ≤ 197HB. ASTM A588 structural steel plate, 45# steel is used to manufacture parts with high strength requirements.
