The history of stainless steel materials

When you touch elevator mirrors, use stainless steel sinks, or stand in front of urban landmark buildings, you are actually interacting with stainless steel sheets. This alloy sheet based on iron with a chromium content of ≥10.5% owes its core advantage to the dense chromium-rich passive film formed on its surface—this "protective coat" can isolate corrosive media, endowing it with high strength, easy processability, and hygiene, making it a "versatile material" in modern industry and daily life.

According to production processes, stainless steel sheets are mainly divided into two categories: Hot-rolled sheets, with a thickness of 3-100mm, have a relatively rough surface but excellent mechanical properties, often used in industrial scenarios such as chemical containers and ship components; Cold-rolled sheets, only 0.2-5mm thick, have a smooth surface after polishing with a tolerance controlled within ±0.01mm, making them the first choice for kitchenware, decorative curtain walls, and medical devices. The familiar grades like 304 and 316L represent different alloy compositions, adapting to various needs from daily necessities to extreme environments.

The latest industry report shows that China's stainless steel sheet and strip industry is ushering in a golden period of development. In 2024, the output reached 38 million tons, with exports accounting for 35%. The domestic market size is expected to expand at an annual rate of 8%-10%, exceeding 300 billion yuan by 2030. The construction industry remains the largest consumer, accounting for over 40%. With the promotion of green building concepts, the demand for high-performance stainless steel sheets continues to rise; the lightweight trend of new energy vehicles has driven a surge in the usage of martensitic stainless steel, and the proportion of the automotive industry will increase from 20% to 25%.

Notably, high-end special stainless steel has become a new growth engine. The consumption of products such as duplex stainless steel and high-grade austenitic stainless steel is growing at an annual rate of 12%-15%, playing a vital role in emerging fields like marine engineering and new energy storage. At the policy level, documents such as the "Guidelines for the Development of the New Materials Industry" clearly support the high-end and intelligent transformation of the industry. Leading enterprises including Baowu Steel and CITIC Metal continue to lead through technological innovation.

In 2025, China's stainless steel sheet technology has achieved multiple milestone breakthroughs, completely breaking foreign monopolies:

The team from the Institute of Metal Research, Chinese Academy of Sciences, solved the world-class problem that metal materials "cannot have both high strength and ductility". Through innovative structural design, the yield strength has increased by 2.6 times while maintaining a uniform elongation of 55%, which can be applied to extreme scenarios such as aero-engine blades and deep-sea drilling platforms.

Baowu Taiyuan Iron and Steel Group produced a stainless steel sheet with a single thickness of 150mm and a single weight of 28 tons, setting a global record. The product has no flaw detection defects and has been applied to major international projects such as LNG storage and transportation.

Northern Heavy Industry Group pioneered atmospheric pressure smelting technology, replacing scarce nickel with nitrogen and manganese, significantly reducing costs. It can be used in high-end fields such as submarine components and non-magnetic parts of MRI equipment.

As a model of sustainable development, stainless steel sheets have the world's highest recycling rate of 88%, and their quality does not degrade after recycling. Data shows that stainless steel sheets using 90% recycled raw materials have a carbon emission of only 26% of that of primary products (1.9kg CO₂/kg vs 6.8kg CO₂/kg), far superior to aluminum alloy and galvanized steel.

Enterprises worldwide are accelerating green transformation: Sweden's Outokumpu factory achieves 87% wind power supply, Brazil's Aperam factory uses 100% biomass energy; Baowu Steel has significantly reduced the production cost of high-end stainless steel through hydrogen metallurgy technology. In the future, with the application of technologies such as AI intelligent sorting and carbon capture, stainless steel sheets will become the core support for "net-zero emission" manufacturing.

Many people mistakenly believe that stainless steel sheets never