8.8/10.9 grade Carbon Steel HDG Hex Electric Tower Bolts for Foundation Construction
 
Description:

Power tower screw professional production enterprises, our company * quality,* service, model complete, spot supply!Iron tower bolt, iron tower screw, power tower bolt, power bolt, hot-dip galvanized bolt, hot-dip galvanized bolt, galvanized bolt, galvanized screw, hot-dip galvanized iron tower bolt, hot-dip galvanized power bolt and other products are available.

The transmission tower bolt in addition to a small number of important occasions to use steel tube tower, most still predominantly tower bolt assembly at the scene, the threaded connection is widely used in power transmission tower bolt assembling way, but under the occasion of dynamic load and temperature difference is bigger, loose bolt connection is likely to happen, loose after the disappearance of the connection strength, can cause equipment damage accident.

Cold drawing, cold upsetting or hot forging, stress removal annealing and hot galvanizing are important forming processes for tower bolts. In this paper, the relationship between 6.8 class tower bolt forming process and residual stress distribution in the subsurface layer of the polished bolt rod was studied, as well as the appearance features and corrosion resistance of hot Zn and zn-5al coating layers at different temperatures.The effects of stress removal annealing and hot dip galvanizing on the surface residual stress of cold heading bolt and hot forging bolt were compared.

By OM, SEM, EDS, X-ray residual stress analyzer and electropolishing instrument, the distribution of residual stress at different depths of the subsurface layer of 6.8 tower bolt polished rod was studied.The corrosion resistance of Zn and Zn-5Al coating on bolt surface was studied by NSS test and electrochemical polarization test.The results show that there are different residual stress states in the surface layer of bolt making process.
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