At the source of the titanium and titanium alloy industry chain, there lies a seemingly ordinary light gray particle - sponge titanium. It has a lightweight texture, a loose touch, and a surface covered with visible tiny pores. It is precisely this unique, natural sponge like porous structure that gives it the image and appropriate name of "sponge titanium". However, beneath this seemingly inconspicuous form lies the surging momentum driving the development of modern high-end industry. Sponge titanium is the most essential and basic raw material for producing all titanium metal materials (titanium ingots, titanium rods, titanium plates, titanium wires, etc.) and titanium powder. Its quality, like genes, fundamentally determines the strength, toughness, corrosion resistance, welding performance, and even the ultimate service performance and application boundaries of subsequent titanium products.
In order to accurately match the diverse downstream needs, the world of sponge titanium is finely divided into seven levels based on an extremely strict set of standards: from the highest end 0A level, to level 0, level 1, level 2, level 3, level 4, and finally level 5. This grading system is not a simple label, but a precise measurement based on two core indicators:
1,Chemical composition: This is the key to determining the purity of sponge titanium. The focus is on the upper limit of the content of key impurity elements such as oxygen (O), nitrogen (N), iron (Fe), carbon (C), and chlorine (Cl). These elements are like "toxins", and even in trace amounts, they can significantly deteriorate the plasticity, toughness, fatigue strength, heat resistance, and welding performance of titanium alloys. The higher the level (such as 0A, 0 level), the more stringent the tolerance for these impurity elements, requiring extremely low content.
2,Brinell hardness: Hardness is a direct reflection of a material's plastic deformation ability and is closely related to the impurity content (especially the interstitial elements oxygen and nitrogen). The more impurities there are, the higher the hardness, and the poorer the material's processing performance (such as forging and rolling). High grade sponge titanium (0A, 0 grade) requires an extremely low Brinell hardness value to ensure its excellent subsequent processing performance and final product performance.
