gypsum screw

6, passivation to remove hydrogen parts should be passivation after the removal of hydrogen, passivation before the application of 1%H2SO4 or 1% hydrochloric acid activation 5~15s. Passivation shall be treated with colored chromate unless otherwise specified in the design drawings.

Reverse twisting of the barbed rope: first wrap the barbed wire around the main wire (that is, a single piece of iron wire) and then add an iron wire and twist together to form a double strand of barbed rope.

To stop normalizing or soxhlet processing of wire rod, spheroidization annealing is used instead of large specification. In the middle, especially before the waste drawing process, the thermal disposal of soxhlet is widely used. Prevent decarbonization during thermal disposal. After hot disposal, sulfuric acid or hydrochloric acid pickling is used to remove the iron sheet. Coating can be used to dip lime, phosphating, borax treatment or copper plating.