Galvanized steel strip is the cold rolled or hot rolled, long and narrow strip of steel with different degrees of plating on a layer called (zinc, aluminum) raw materials. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. Complex physical and chemical reactions occur between the substrate of hot dip galvanized steel strip and molten bath to form a corrosion-resistant zinc iron alloy layer with compact structure. The alloy layer is integrated with pure zinc layer and strip substrate. Therefore, it has strong corrosion resistance.
The first stage is pickling the whole coil of strip steel to achieve bright and clean surface. The second stage is hot-dip galvanizing or hot-dip galvanizing, and the third stage is the storage of strip steel after galvanizing. Galvanized steel strip has the characteristics of no rust and corrosion resistance for many years. It can not be affected by external adverse environment, and always maintain its own performance and appearance. In the process of using galvanized steel strip, in order to improve its operation efficiency and its own characteristics, we can carry out post-treatment on the finished galvanized steel strip to make its performance more excellent.
Galvanized Steel Strip,Galvanzied Steel Coil,Galvanized Steel Sheet,Zinc Coated Steel Coil,Galvanized Aluminium Steel Coil Jinan Hengming Steel Co., Ltd , https://www.jnhengmingsteel.com
Maybe you only know the use of the vault door, but it is not clear about its lock security, lock level requirements, the following Tianqi simple to introduce you to the functional use of several locks it!
The mechanical lock transmission has two-direction locking bolts and large handwheels. The transmission mechanism is flexible. In addition to supporting the weight of the door leaf, the door hinge can also be adjusted to ensure that the gap between the door leaf and the door frame meets the design requirements. Under the external force of no more than 147N, the door leaf can be opened and closed flexibly. The door inserting tongue and the actuator are flexible in movement. The manual lock can lock or open the door leaf under the force of no more than 30N.
The main door is equipped with two US-original UL-certified Shakin S&G 6731 4-rotor mechanical combination locks and 938G-type castle-tag double-head interlocking lock and a 633-type timing lock.
The double-headed lock is a double-key operation type; its theoretical key quantity is not less than 60000, its mutual opening rate is not more than 0.03%, the step difference is not less than 0.5mm or 15° angle, and there is an anti-drilling function at the keyhole. The length of the key shaft of the single-key special lock is not less than 100mm. 
Mechanical combination lock: The password combination of the mechanical combination lock is not less than 108. The mechanical code lock rotation piece mandrel can withstand 2000N force in the locked state without disengagement. When the mandrel is disengaged, the rotation piece maintains the original position and the coded lock remains locked. The mechanical code lock meets the requirements of 5.4.7 of the GA/T73 standard.
The vault door is applied to small-scale vaults of grass-roots units in the financial sector. Its relatively economical price and practicality are favored by users. There are many options for the style of this product. The vault doors are generally customized. Before customers decide to purchase, they must first understand what their own needs for the product are, whether it is in style, color, size, We usually produce according to the customer's needs, but it takes time to complete the production.