GR2Impact energy: 50 joules

Many people think that pure titanium GR2 is soft and will break when hit. Wrong! It has an anti-intuitive property. It lies precisely in being able to withstand impact. I work with titanium materials. In plain language today, the strength of GR2 can be measured by its absorption energy in the impact test, which is in joules. It is used to determine whether it absorbs energy when suddenly subjected to load and whether it breaks or not. GR2 is industrial pure titanium in the α single-phase annealed state. The impact power at room temperature is approximately 50 joules, ranging from 20° to -190°. The entire process is a ductile fracture without the brittleness of ordinary steel. The transition temperature is -196°. In liquid nitrogen environment, it can still maintain above 40-50 joules. Therefore, liquid nitrogen tanks and marine seawater pipes can use it. Pay attention to two misunderstandings. First, cold processing will increase the strength, but the plasticity and impact energy will decrease. Don't only look at the tensile strength of the formed parts. Second, argon arc welding is fine for welding, but the weak oxidation and hydrogen absorption in the heat affected zone will damage the impact toughness. The protection gas must be in place when selecting the grade. Remember, GR2 is not used to replace GR5 for high-impact structures, but to use the sufficient impact toughness, corrosion resistance, and lightweight to achieve better cost performance. It is mainly used in chemical heat exchangers and desulfurization parts, and medical stents. Remember this one sentence: GR2 is not afraid of cold brittleness, but it is afraid of oxidation. Impact energy depends on both temperature and state.