China Uses Stainless Steel For Iconic Hong Kong-Zhuhai-Macau Bridge

In a global showcase of advantages of using stainless steel in the corrosion-prone coastal areas, China has built a 55 km long Hongkong – Zhuhai – Macau Bridge using around 10,000 tonnes of stainless steel, among other metals. The bridge has used over 10,000 tonnes of nickel containing duplex stainless steel reinforcement bars in construction at critical corrosive zones. This is expected to ensure a projected life of 120 years for the structure, which will be under constant corrosive attack of saline sea water. This landmark structure is a bridge tunnel system consisting of a series of three cable stayed bridges, one 6.7 km under sea tunnel, and 3 artificial islands. The bridge is an engineering marvel constructed over 9 years, at an estimated cost of $20 billion.

India also has a vast coastline, ranging over 7000 kilometres, comprising 9 states and 4 union territories. Infrastructure in these areas faces saline moisture attack, which causes serious corrosion, impacting its strength, safety and longevity. India adopted a stainless steel reinforcement bar standard IS 16651 in 2017. However, the users are yet to realize its potential and benefits, and hence, continue to use other traditional materials. Low awareness about this product and perception of high costs deter users from considering stainless steel, even in corrosive coastal and marine environments.