Case

Against the backdrop of increasingly stringent requirements for equipment corrosion resistance and stability in high-end chemical and biopharmaceutical industries, composite plates made of TA2G industrial-grade titanium and Q345R vessel steel are emerging as the ideal material choice for critical process equipment in harsh environments, thanks to their superior corrosion resistance, excellent structural strength, and cost-effectiveness. However, the overall manufacturing process for large, complex equipment still faces a series of technical challenges: the titanium cladding is highly chemically active and reacts readily with oxygen, nitrogen, and hydrogen at high temperatures, necessitating continuous protection under high-purity inert gas throughout the process; the forming and welding of composite plates must balance the synergistic performance of the base metal’s strength and the cladding’s corrosion resistance; and the large-scale, thin-walled nature of the components, coupled with stringent sealing requirements, pose severe challenges for forming precision, deformation control, and non-destructive testing. Forming of Large Thin-Walled Structures and Control of Welding Distortion Equipment cylinders and heads are large-diameter, thin-walled components; composite plates are highly susceptible to buckling deformation under welding heat input. The concentrated distribution of multiple longitudinal and circumferential welds, combined with the welding of internal supports and accessories, results in complex superimposed welding stresses. If not properly controlled, this can easily lead to dimensional deviations, loss of roundness, or even wave-like deformation, directly affecting the assembly of internal components and operational stability. During the forming stage, precise plate rolling and rounding processes are employed to strictly control forming accuracy. During welding, deformation of the cylinder is effectively suppressed by optimizing the welding sequence and rationally distributing heat input, ensuring that overall dimensions meet design requirements. Quality Control for Composite Plate Welding Different welding processes must be used for the TA2G overlay and the Q345R base plate. Overlay welding is extremely sensitive to gas shielding; even slight deficiencies in shielding can lead to porosity and oxide inclusions. During base plate welding, care must be taken to prevent heat affect or contamination of the overlay. In thick-section multi-pass welding, inadequate control of interpass temperature and cleanliness can easily result in hidden defects such as lack of fusion and slag inclusions. Submerged arc welding is used for the base metal to ensure deposition efficiency and quality, while high-purity argon gas shielded welding is employed for the overlay. Interpass temperature and groove cleanliness are strictly controlled. Every circumferential and longitudinal weld undergoes multiple inspections, including visual inspection, dye penetrant testing, and radiographic testing, to ensure the high purity and mechanical properties of the weld metal. High Sealing Requirements and Prevention of Welding Defects As pressure vessels, all pressure-bearing welds must pass 100% non-destructive testing and must be free of any through-wall defects. The inspection of clad plate welds must account for both the base metal and the cladding, placing higher demands on inspection methods and sensitivity. Complex Assembly and Precision Assurance The equipment comprises numerous non-standard components, including nozzles, flanges, baffles, and supports, fabricated from TA2G pure titanium, carbon steel, and composite plates. These components require extensive fillet and load-bearing welds to connect them to the vessel shell. High precision is required for component alignment, as shrinkage and deformation caused by the heat of welding directly affect the final assembly dimensions and functionality. The project team simulated welding deformation trends in advance and scientifically allocated shrinkage allowances. During assembly, components were precisely positioned and welded in stages, ensuring accurate positioning of all internal components and reliable connections while controlling deformation. We understand that what we deliver is not merely a piece of equipment, but the confidence and assurance that will support the safe, stable, and optimal operation of our clients’ projects. With continuous improvements in manufacturing processes and the accumulation of engineering data, vessels made of titanium-steel composite plates are rapidly gaining traction in high-value-added applications due to their exceptional corrosion resistance, structural efficiency, and cost-effectiveness. Looking ahead, our company will continue to uphold the spirit of craftsmanship and pursue excellence, making forward-looking investments in areas such as intelligent forming and high-efficiency welding. We are committed to providing our customers with comprehensive solutions for composite-plate equipment that offer lower total lifecycle costs and enhanced reliability.          

Recently, NBSM undertook a project for the end of the batch of composite plates for titanium-steel (SB265 Gr11 + SA516 Gr70). The owner is an important customer in South Korea. To ensure the progress and quality of the project, the owner came to the factory to accept the project. They carried out a full range of acceptance tests, including surface quality, bonding quality, length, width, thickness, and smoothness. The results were higher than the project and relevant standard requirements. The results exceeded the project and standard requirements. To facilitate further cooperation, NBSM inspected all aspects of its production capacity, production qualifications, and production environment. This included safety, health, and environmental protection; quality systems; procedural documents; equipment capacity; past results; the qualifications of cooperative suppliers; and daily training. This inspection laid a good foundation for further cooperation. NBSM is one of the largest explosive composite plate production companies in China and a high-end plate manufacturing base. The main purpose of this customer visit is to further deepen cooperation around the common supply chain, industrial development, and other areas. The goal is to innovate the mode of cooperation, expand the field of cooperation, and promote higher-quality, win-win cooperation. After the above inspections, a preliminary intention to cooperate has been reached.  

NBSM has successfully developed a titanium alloy chain stretching machine that effectively shortens the production cycle and improves production efficiency. The machine uses PLC control combined with a touchscreen interface to automate its operation.During operation, the stretching parameters (e.g., upper limit of pulling force and holding time) are set via the touch screen. The PLC then receives commands and controls the motor to drive the chain stretching device. At the same time, the chain tension and displacement information is displayed on the touch screen.The titanium alloy chain stretching machine supports one-key start and stop functions, which greatly reduces operational difficulty and labor intensity while ensuring safety and reliability. The machine has functions for querying, storing, and taking screenshots of historical data, and it supports viewing real-time curves. Additionally, it can download data.The titanium alloy chain stretching machine improves the efficiency and precision of chain stretching while reducing the difficulty and intensity of operation. It is applicable to various chain stretching needs of different specifications and types. Since its introduction, the equipment has demonstrated stable performance and reliable operation.

NBSM has a long history of cooperation with customers in Europe, America, and Southeast Asia. Recently, important customers from Southeast Asia came to the factory to inspect and accept a project in order to develop further cooperation. They inspected Nanjing Baotai's production capacity, production qualifications, on-site environment, and product quality. NBSM is one of the largest explosive composite plate production companies in China and the manufacturing base for high-end metal explosive composite plates. The main purpose of this visit is to strengthen cooperation between the two companies in building a complete supply chain, industrial development, and exploring overseas markets. This will further strengthen the relationship, innovate the mode of cooperation, expand the scope of cooperation, and promote a win-win situation in higher-end cooperation. After the inspection and acceptance, a comprehensive cooperation agreement was reached. The cooperation projects have been fully accepted, including non-destructive testing, material size, shape, surface, packaging, and physical and chemical properties. All of these meet the procurement requirements and relevant standards and specifications.  

Thanks to close communication and cooperation between both parties and strict production and quality control measures, a batch of titanium-steel composite plate equipment made of European-standard SB-265 Gr.1+P355GH, provided by our company, has been successfully shipped from the customer's site and is about to embark on its journey to South America. This batch of titanium steel composite plates has a maximum plate width of 2000 mm × 6900 mm, with a total of more than 100 plates. The plates are made of SB-265 Gr.1 titanium material with a thickness of 3.5 mm. Currently, the market offers plates with a width of 1000/1219/1500 mm (W) × L. These plates are made by casting a splicing weld on the material. We now use our complete material industry chain advantage to clad titanium plates in our Jingxian factory. Using their own melting, forging, billet, rolling, pickling, and other processes, we rolled out a single sheet of 3.5 mm × 2120 mm × 7000 mm SB-265 Gr.1 titanium plate. This single composite plate does not have any splicing welds, which greatly reduces the risk of subsequent corrosion hazards. From initial communication about the plate design to delivery of the finished product, both teams have invested considerable effort at every step. Our company understands the importance of equipment for developing the customer's overseas business. As always, we uphold a rigorous and professional attitude throughout the process. During the layout stage, our engineers examined every technical detail repeatedly, striving to maximize the board width, minimize the weld seams, and optimize quality to efficiently and stably meet the customer's production needs. Through repeated communication, we have a thorough understanding of the customer's needs and concerns. We have incorporated this valuable information into the titanium plate preparation design and composite plate dimensions to give them unique, innovative advantages and practical functions.