There are several reasons why 316 stainless steel is more expensive than 304 stainless steel. First of all, the alloy composition of 316 stainless steel contains more nickel and molybdenum. These two elements play a key role in improving the corrosion resistance and corrosion resistance of stainless steel. Nickel and molybdenum are relatively expensive alloying elements, thus increasing the manufacturing cost of 316 stainless steel, thus driving up its price.

Secondly, 316 stainless steel is usually used in more harsh environments, such as seawater environments. Under such conditions, the performance requirements for stainless steel are higher and more corrosion-resistant materials are needed. In order to meet these requirements, the process of manufacturing 316 stainless steel may require more processes and technologies, which also further increases its production cost.

In addition, market demand is also a factor affecting price. Since 316 stainless steel has better corrosion resistance, the demand for 316 stainless steel may be greater in certain specific application fields, such as chemical industry, marine engineering, etc. This high demand will also have a certain impact on prices.

Overall, the high price of 316 stainless steel is mainly due to its higher alloy content, more stringent usage requirements and the impact of market demand. These factors together lead to its higher price relative to 304 stainless steel.