This document describes the standardized production process, cold and hot working characteristics, and causes of residual stress for our 2mm pure zirconium plate, 1.5mm pure niobium plate, NbZr1 alloy plate, and Nb-1Zr alloy wire. It also focuses on the corrosion resistance of niobium-zirconium alloys, clearly distinguishing the differences in processing conditions for each product, and answering questions related to material stress anisotropy.
This document also describes the standardized production process, cold and hot working characteristics, and causes of residual stress for our 2mm pure zirconium plate, 1.5mm pure niobium plate, NbZr1 alloy plate, and Nb-1Zr alloy wire. It also focuses on the corrosion resistance of niobium-zirconium alloys, clearly distinguishing the differences in processing conditions for each product, and answering questions related to material stress anisotropy.
This document also describes the standardized production process, cold and hot working characteristics, and causes of residual stress for our 2mm pure zirconium plate, 1.5mm pure niobium plate, NbZr1 alloy plate, and Nb-1Zr alloy wire. Our company's standardized production process, hot and cold working characteristics, and residual stress causes for 2mm pure zirconium plates, 1.5mm pure niobium plates, NbZr1 alloy plates, and Nb-1Zr alloy wires are detailed. The process also emphasizes the corrosion resistance of niobium-zirconium alloys, clearly distinguishes the differences in processing conditions for each product, and answers questions related to material stress anisotropy.
The overall process is as follows: raw material smelting → high-temperature hot forging → high-temperature hot rolling → surface finishing → multi-pass cold rolling → optional vacuum annealing of finished products → finishing inspection → packaging and shipping.
Niobium ingots are prepared through vacuum consumable arc melting. After machining and flaw detection, they are hot-forged at 1200-1400℃ to break up the as-cast structure. Subsequently, they are hot-rolled at 1000-1200℃ to produce 5-8mm hot-rolled slabs. Surface oxidation defects are removed through pickling and grinding. Niobium exhibits significant work hardening characteristics. The slab is thinned to a finished thickness of 1.5mm through multiple cold rolling passes. During rolling, an intermediate vacuum annealing process at 750-850℃ is employed to continuously restore the material's plasticity and ensure rolling stability.
The delivery conditions are also divided into two types: cold-rolled sheets without final annealing, exhibiting significant directional residual stress; and sheets that have undergone high-vacuum annealing at 750-900℃, where residual stress is largely eliminated, resulting in uniform and stable material. Custom production can be tailored to customer requirements.
The overall process is as follows: Vacuum alloy melting → Hot forging and hot extrusion → Intermediate homogenization heat treatment → Multi-pass cold drawing (interspersed with intermediate annealing) → Finished product precision drawing → Finished product vacuum annealing → Surface treatment → Inspection and packaging.
Using high-purity niobium and zirconium raw materials, Nb-1Zr alloy ingots are prepared through multiple vacuum arc melting processes. After flaw detection and peeling, they are hot-forged at 1200-1400℃ and then hot-extruded into rough billets. The billets undergo homogenization heat treatment and surface grinding, followed by a multi-pass cold drawing process to gradually reduce their diameter. Due to the extremely high work hardening of niobium-zirconium alloys, repeated high-vacuum intermediate annealing at 750-850℃ is required during the drawing process to prevent wire cracking and breakage. After precision drawing to the final dimensions, the finished wire undergoes vacuum annealing at 800-950℃ to obtain a soft, low-stress finished wire. Finally, after straightening, flaw detection, and mechanical property testing, it is coiled, packaged, and shipped.
