The cold working performance of ASTM A514 structural steel material 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 A514 structural steel material 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.
ASTM A514 structural steel material 2020 stock in Tianjin: 7*2920*8200, 32*3000*7440, 14*2150*9300, 16*2200*10000, 12.5*2900*11000, 7*2920*8200, 14*1950*11000, 80*2200*10000, 16*2230*7650, 7*2920*8780, 32*2900*9700, 20*1950*9550, 10*2200*7200, 23.1*2590*7790, 20*1400*11400, 20*1950*9700, 7*2920*8780, 20.9*2851*7000, 25*1600*9300, 30*2200*9000, 14*1950*10550, 30*1600*8600.
Try to use ASTM A514 structural steel material high-quality alkaline covered electrode as much as possible, and don't use inferior electrode to save money. According to the theory of chromium poor, chromium carbide will be precipitated on the upper edge of the grain boundary of the weld and heat affected zone when the ASTM A514 structural steel material temperature range is between 450 ℃ and 850 ℃, resulting in chromium poor grain boundary, which is insufficient to resist corrosion.
In order to obtain the seamless tube with smaller size and better quality, the method of cold rolling, cold drawing or the combination of the two must be used. Cold rolling is usually carried out on a two high mill, and ASTM A514 structural steel material pipes are rolled in a circular pass composed of a variable cross-section circular groove and a fixed conical head. Cold drawing is usually carried out on single chain or double chain cold drawing machines of 0.5-100t.
