NEWS&CASES
Time：2025-09-22
Class：Cases
Baosteel Desheng Develops BN1P1 Stainless Steel for Painted Doors, Leading Industry Transformation
I. Addressing Industry Pain Points and Initiating R&D
With their relatively affordable prices and diverse appearances, carbon steel painted doors were widely used in the home decoration market in the past. However, over time, their shortcomings have become increasingly apparent. In humid environments, carbon steel is highly prone to rust, which not only damages the door’s appearance but also weakens its structural strength—typically limiting the service life of carbon steel painted doors to just 5–8 years. Furthermore, carbon steel painted doors perform poorly under special conditions such as high temperatures or impacts, failing to provide reliable protection for home safety.
Recognizing this market demand, Baosteel Desheng joined forces with multiple research institutions to develop a new material that overcomes the limitations of carbon steel painted doors. The R&D goal was clear: to create a stainless steel material with excellent corrosion resistance, superior mechanical properties, and high aesthetic value, meeting the demand for high-quality doors in modern homes.
II. Overcoming Technical Bottlenecks Through R&D
(1) Optimizing Composition Design to Enhance Corrosion Resistance
The R&D team understood that the corrosion resistance of a material largely depends on its chemical composition. They conducted in-depth research and optimization of the stainless steel alloy ratio. While maintaining the basic properties of stainless steel, the team precisely adjusted the content of elements such as chromium (Cr), nickel (Ni), and manganese (Mn) to enhance the material’s passivation ability—enabling it to effectively resist corrosion in various environments. After numerous tests and analyses, the final alloy ratio of BN1P1 significantly improved its corrosion resistance, laying the foundation for the product’s long service life.
(2) Controlling Surface Treatment to Strengthen Paint Adhesion
Paint adhesion is a key factor affecting the quality of painted doors. Traditional stainless steel has a relatively smooth surface, which is unfavorable for paint adhesion. Using advanced surface treatment technology, Baosteel Desheng’s R&D team precisely controlled the surface roughness of BN1P1 to Ra ≤ 1.6μm. This roughness ensures tight bonding between the paint and the material without compromising its appearance. After painting, the treated BN1P1 material exhibits significantly improved paint adhesion, effectively preventing issues such as paint peeling or cracking and keeping the door’s appearance intact over time.
(3) Solving Process Challenges to Ensure Product Quality
During R&D, the team also faced process challenges, such as insufficient three-dimensionality of complex embossed patterns and sheet shape rebound. If left unaddressed, these issues would severely affect the product’s appearance and performance. Through repeated tests, the researchers adjusted processing parameters and upgraded equipment to overcome these challenges. For example, by optimizing the design of embossing molds and processing techniques, the three-dimensionality of complex embossed patterns was significantly enhanced, meeting consumers’ demands for personalized and aesthetically pleasing designs. Innovations in sheet shape control technology also effectively resolved rebound issues, ensuring the product’s dimensional accuracy and flatness.
III. Outstanding Performance and Distinct Advantages
(1) Strong Weather Resistance for Versatile Environments
Rigorous testing showed that BN1P1 has excellent weather resistance. Its physical and chemical properties remain stable at extreme temperatures ranging from -20°C to 120°C, with no deformation or cracking. Whether in the cold winters of northern China or the hot, humid summers of the south, painted doors made from BN1P1 function normally, providing reliable protection for homes.
(2) High Corrosion Resistance for Extended Service Life
The salt spray test is a critical method to evaluate corrosion resistance. BN1P1 performed exceptionally well: after 1,000 hours of salt spray exposure, its surface showed no signs of rust. Compared to traditional carbon steel painted doors (with a 5–8 year lifespan), BN1P1 extends the service life to over 20 years. This not only reduces the cost and hassle of door replacement for consumers but also aligns with sustainable development goals by conserving resources.
(3) Excellent Fire Resistance for Home Safety
Fire safety is of utmost importance, and doors serve as a key line of defense for homes. BN1P1 has a fire resistance rating of up to 1.5 hours, meeting China’s national Class A standard. In the event of a fire, it effectively slows the spread of flames, buying valuable time for evacuation and firefighting, thus greatly improving home safety.
(4) Enhanced Strength to Resist External Impacts
In terms of mechanical properties, BN1P1 is 40% stronger than traditional carbon steel plates. Painted doors made from BN1P1 can withstand stronger external impacts, such as typhoons of magnitude 12. Even in the case of accidental collisions, the door is less likely to be damaged, better protecting the interior of the home.
IV. Broad Application Prospects and Industry Upgrading
Currently, BN1P1 has passed trial verification by several leading domestic enterprises. Its surface can achieve 12 different texture effects, including wood grain imitation and metal wire drawing, catering to the demand for personalized design in modern homes. Whether for high-end villas, luxury apartments, or ordinary residences, suitable surface effects can be selected to match different decoration styles, adding unique charm to homes.
Baosteel Desheng’s BN1P1 stainless steel not only fills the gap in the application of stainless steel in high-end painted doors but also injects new vitality into the home decoration industry. It drives the industry toward “long service life, high safety, and personalization,” leading a new trend in development. It is believed that with the widespread application of BN1P1 in the future, the home decoration market will undergo a major transformation, bringing consumers higher-quality, safer, and more aesthetically pleasing home experiences.