CP titanium Gr1 Gr2 Gr3 Gr4

Low-strength industrial CP titanium

Industrial CP titanium refers to unalloyed titanium with different impurity contents such as Fe, C, 0, N, etc. It has high plasticity, excellent forming process performance and excellent corrosion resistance. Industrial CP titanium can also be welded in various ways, and its joint strength and plasticity are almost the same as the base metal. Industrial pure titanium has good cold/hot processing performance and can produce various specifications of titanium plates, foils, bars, wires, pipes, strips, phase forgings and castings. Industrial CP titanium is used in various fields such as aviation, aerospace, shipbuilding, chemical industry, biomedicine, construction, and transportation with its excellent comprehensive properties. The long-term working temperature of industrial pure CP titanium is 300 ℃.

Pure titanium grade

Chemical composition of industrial pure CP titanium (mass fraction/%)

Chemical composition of industrial pure CP titanium wire% (mass fraction)

Industrial pure CP titanium product specifications and supply status

Physical and chemical properties

Thermal performance

1. Melting temperature range 1640-1670℃

Thermal conductivity of industrial pure CP titanium

Specific heat capacity of industrial pure CP titanium

Magnetic properties：Non-magnetic.

Chemical properties

Titanium has high chemical activity and can react with many elements. It can react with CO, CO2, H2O, NH3 and many volatile organic compounds at high temperatures. Titanium reacts with certain gases, not only forming compounds on the surface, but also entering Metal lattices form interstitial solid solutions. Except for hydrogen, the reaction process is irreversible.

1. Antioxidant properties

Generally, when titanium is heated in an air medium at the temperature of use, an extremely thin, dense and stable oxide film is formed, which has a protective effect and can prevent O from diffusing into the metal without further oxidation; therefore, titanium is at 500℃ It is stable in the air below. The oxidation of titanium below 538°C conforms to the parabolic law. When the temperature is above 800℃, the oxide film will decompose, and oxygen atoms will use the oxide film as a conversion layer to enter the metal lattice, which increases the oxygen content of titanium and thickens the oxide film. At this time, the oxide film has no protective effect and causes The metal becomes brittle.

2. Corrosion resistance

Titanium and its alloys have outstanding corrosion resistance to most chemical media. But 4 kinds of inorganic acids: hydrofluoric acid, hydrochloric acid, sulfuric acid and orthophosphoric acid and 4 kinds of hot concentrated organic acids: oxalic acid, formic acid, trichloro(substituted) acetic acid and trifluoro(substituted) acetic acid, and extremely corrosive aluminum chloride , Has a serious corrosive effect on titanium and its alloys. In these media, in addition to hydrofluoric acid, heating an oxidant such as nitric acid in its solution can reduce the degree of corrosion, or even no corrosion. The corrosion resistance of industrial pure CP titanium in organic acid, inorganic acid, organic compound, alkali solution and salt solution is divided into 3 grades:

Excellent-corrosion resistance, the corrosion rate is below 0.127 mm/a:

Good-relatively corrosion resistant, the corrosion rate is between 0.127-1.27 mm/a;

Poor-not resistant to corrosion, the corrosion rate is above 1.27 mm/a.

Titanium is sensitive to the stress corrosion cracking of some anhydrous chemical reagents, such as methanol and nitrogen tetroxide: trace amounts of water inhibit the reaction in both scenarios, but in the N2O4 medium, NO plays a major role. The suppressed N2O4 contains 04-08% NO. The red smoke contains less than 159% water and 10% 20% NO2, which can cause cracks in the metal and produce a very violent reaction.

Titanium and its alloys are also sensitive to the stress corrosion of dry sodium chloride at high temperatures. This phenomenon has appeared in large numbers in experiments at 230 ℃, 260 ℃ or higher in the laboratory, and occasionally can be observed in the manufacturing workshop. However, there have been no reports of damage to titanium components caused by thermal salt stress during work. It is recommended to use non-chlorine solvents to clean parts whose working temperature is higher than 230 ℃.

Electrochemical corrosion

In a galvanic battery system composed of most metals, the potential of titanium and its alloys is a high-priced positive potential, so that other metals or alloys are corroded when in contact with them, and the potential of titanium is only lower than that of nickel-based alloys.

Hydrogen embrittlement

For titanium and its alloys, hydrogen embrittlement is an important issue. Titanium easily absorbs hydrogen from the high temperature atmosphere of pickling solution, etching solution and thermal processing (thermal deformation and heat treatment). Hydrogen embrittlement of titanium and its alloys can be one of the following two forms. For industrial pure iron and a alloys, the surface plasticity of ammonia cells decreases, while the strength increases slightly. At the same time, it is also found that the impact toughness of the alloys is lower than 93°C. Decrease, and the brittle-plastic transition temperature range changes. The second form is similar to the embrittlement of steel, which is a kind of embrittlement phenomenon that occurs when the slow speed test is carried out under the continuous load under the load. This test method usually uses notched specimens, applies a stress higher than a certain strength level, and observes the behavior of its cellularity. It is usually stipulated that the hydrogen mass fraction of the finished parts of titanium and its alloys in use should be less than 0.015%.

Welding performance

Industrial pure CP titanium is suitable for all kinds of welding. The welding place has excellent flow characteristics, and has the same strength, plasticity and corrosion resistance as the base material.