The most widely used steel material in the construction field is steel bars. With the rapid advancement of production technology, the application of stainless steel bars has gradually become more widespread, regardless of price factors.

Nowadays, the level of domestic hot-rolled ribbed steel bars has been rapidly improved. The policy clearly points out the promotion of hot-rolled ribbed steel bars with a strength of 400MPa and above, accelerating the elimination of hot-rolled ribbed steel bars with a strength of 335MPa, and the mandatory use of steel bars with a strength of 400MPa and above for buildings, building foundation projects, and key projects in earthquake-prone areas. It is precisely because of the requirements for the strength of steel bars that stainless steel bars are also favored by the market, and some key buildings have begun to use stainless steel bars.

The use of stainless steel bars in reinforced concrete structures can increase strength and resist corrosion of embedded steel bars in harsh marine environments and chlorides formed in concrete. Corrosion-resistant stainless steel concrete is used on the bridge deck of marine buildings to meet strength, corrosion resistance and earthquake requirements. It is maintenance-free and has a lifespan of up to 120 years. Stainless steel bars can also be used on bridge piers, docks, pile foundations, breakwaters, anchoring systems, boat mooring gear, gangways, and railings. In many industrial fields, high-strength, corrosion-resistant stainless steel bars are also used for the basic structures of important equipment that require high corrosion resistance.

Although the initial cost of stainless steel bars is higher than ordinary carbon steel bars, stainless steel bars can still be widely used in the construction industry in the future.

According to expert analysis, ordinary carbon steel is prone to corrosion and failure. Under carbonization (carbon dioxide in the air and calcium hydroxide in cement generate water and calcium carbonate in the presence of water), the pH of the concrete will decrease, thereby reducing the impact on the concrete. The protective ability of steel bars, leading to corrosion of steel bars.

One of the advantages of stainless steel bars is that there is a self-healing chromium-rich oxide film on the surface of the stainless steel, which has very good resistance to chloride ion corrosion and does not require concrete protection. In addition, stainless steel bars also have other advantages that ordinary carbon steel does not have, such as reducing the use of concrete sealants, simplifying concrete proportions, reducing maintenance costs, and being completely recyclable.

Stainless steel bars are currently mostly used in important infrastructure projects such as bridges and coastal highways and high-speed railways, and their effects are obvious. In seawater, coastal environments, or on roads contaminated by ice and salt, chloride migration throughout the concrete envelope causes significant corrosion of the steel reinforcements over the design life of the structure, causing structural problems and costly maintenance. cost. However, stainless steel bars have good corrosion resistance and can be well used in these reinforced concrete structures in major corrosive environments.