In the production process of chemical equipment, chemical equipment generally needs to withstand high temperature, low temperature, high pressure, strong corrosion and other media conditions, while the connection fastener icon in chemical equipment faces harsh environment, safety requirements, equipment corrosion It will inevitably lead to the decline of the mechanical properties of the equipment, such as the thinning of the wall shell, which is easy to cause safety accidents; 

the requirements of product quality, equipment corrosion will pollute the product, if the equipment is corroded by iron or stainless steel, it will bring in impurities such as iron ions icon, and lead to The color and appearance of the product are obviously abnormal; 

the requirements of cost control, equipment corrosion seriously affects the service life of the equipment and increases the investment cost of the equipment.For example, oil exploration is a very important field in the chemical industry. 

With the development of ultra-deep and ultra-inclined oil and gas wells and HS CO, Cl and other oil and gas fields, with the continuous improvement of technical level, the drilling speed is accelerated, and the drilling depth is deepened. Reaching more than 7500 meters), the demand for fastener products with anti-corrosion performance requirements is increasing. 

304, 316, 321 and other materials, such austenitic stainless steel fasteners are generally non-magnetic or weakly magnetic, and have high toughness and plasticity, and have good cold working properties. 

Its processing strength grade can meet the requirements of daily use. And it has the performance of resistance to oxidative acid icon medium corrosion.