Titanium category

Trademark

Key Features

Examples of use

The iodine Law titanium

TAD

This is the iodide method to obtain high-purity titanium, it is called the iodine method titanium, or chemical titanium. However, there is still oxygen. Nitrogen. Carbon such gap impurity elements, they are a great influence on the mechanical properties of pure titanium. With the increased purity of the titanium, the titanium strength, hardness is decreased significantly. The starting characteristics: good chemical stability, but the intensity is at the end.

Due to a lower intensity of high purity titanium, the significance of its application as a structural material is small, and therefore rarely used in industry. At present, is widely used in the industry of industrial pure titanium and titanium alloys.

Industrial pure titanium

TA1
TA2
TA3

Commercially pure titanium with different chemical pure titanium: it contains more oxygen nitrogen carbon and a variety of other magazines elements (such as iron. Silicon, etc.), it is essentially a low alloy content of titanium alloy. Titanium as compared with the chemical, because it contains more of the magazine elements greatly enhance its strength, its mechanical properties and chemical resistance and stainless steel similar (but compared and titanium alloys, the strength is still low)

Characteristics of commercially pure titanium: not high intensity, good plasticity, easy to process to make the trip, stamping, welding, cutting performance; with good atmosphere, sea water wet chlorine and oxidizing, neutral, weakly reductive medium corrosion, oxidation resistance superior to most odorless solid stainless steel, but poor heat resistance, the use of the temperature is not too high.

Industrial pure titanium in accordance with the different impurity content, the divided into TA1.TA2, and TA3 three grades. Gap of three industrial pure impurity element is gradually increased, so its mechanical strength and hardness also will progressively increase, but the plasticity. Toughness corresponding decline.

Commonly used industrial pure titanium TA2, because of its moderate corrosion resistance and mechanical properties. High corrosion resistance and strength requirements can be used TA3. Require better molding properties can be used TA1.

(1) is mainly used as a working temperature of 360 degrees the uneven force but requires high plastic stampings and corrosion resistance of structural components, example: the skeleton of a skin of the aircraft, engine accessories, marine seawater corrosion-resistant pipes, valves, pumpsand water with desalination system components, the heat exchanger on the chemical pump, distillation towers, chillers, stirrers, tee, impellers, fasteners, ion pump, compressor valve diesel engine piston, evenrod, leaf spring.

(2) TA1.TA2 at an iron content of 0.095% and the oxygen content was 0.08% and the hydrogen content of 0.0009% and a nitrogen content of 0.0062%, having a good low-temperature toughness and high low-temperature strength, can be used as -259 ° C. following low-temperature structural materials.

α-titanium alloy

TA4

Such alloy single α-phase state at room temperature and use of temperature, heat treatment can not be strengthened (chase off is the only way), mainly relying on the solid solution strengthening. Strength at room temperature is generally lower than the β-and α + β type titanium alloy (but higher than that of commercially pure titanium), and strength under high temperature (500 ℃ 600 ℃) and metamorphosis are three types of titanium alloy, the highest strength and organizational stability, oxidation resistance and good welding performance, corrosion resistance and cutting performance is also good, but the plastic is still good (thermoplastic) at room temperature stamping performance. Wherein the most widely used is TA7, it is in the annealed condition has a moderate strength and sufficient ductility, good weldability, can be used below 500 ℃, when the gap (oxygen, hydrogen, nitrogen, etc.) content of impurity elements is extremely low, longer ultra-low temperature Shihai has good toughness and mechanical properties, excellent, one of the ultra-low-temperature alloy.

Tensile strength is slightly higher than the commercially pure titanium, do moderate-intensity range of structural materials, mainly used for domestic wire.

TA5
TA6

Used to work in the corrosive medium 400 ℃ parts and welding parts, such as aircraft only skin, skeleton parts, compressor housing, blades, ship parts, etc..

TA7

500 ℃, long-term structural parts and die forgings, short-term use to 900 ℃. Can also be used as a member (such as ultra-low temperature (-233 ° C) with the ultra-low temperature container).

TA8

500 ℃ part of the long-term work, can be used for the manufacture of engine compressor disk and blades. Alloy is less stable. Subject to certain restrictions on the use.

β-type titanium alloy

TB2

For these alloys, the main alloying element is molybdenum, chromium, vanadium, etc. Stability of β-elements. Easily in normalizing or stage fire High β phase remains to room temperature, to obtain a metastable β single phase structure, so called βtype titanium alloy. β-type titanium alloy can be heat strengthened, high strength, a good weldability and pressure processing performance; but the performance is not stable enough, the smelting process is complicated, so the application of the less extensive α-type, α + β-type titanium alloy.

Below 350 ℃ working parts, mainly for manufacturing sheet metal stamping and welding pieces of the overall heat treatment (solid content. Aging); such as compressor blades, roulette, shafts and other heavy duty rotating parts, as well as aircraft componentsand so on. The TB2 alloy Usually delivered in the solution-treated condition, and then the solid content after aging.

α + β type titanium alloy

TC1
TC2

Such alloys at high temperature is α + β-type two-phase structure, which was named the α + β type titanium alloy. It has good mechanical properties, mostly heat treatment to strengthen (but TC1, TC2, TC7 heat treatment can not be enhanced), forging, stamping and welding performance high cutting strength at room temperature. 150 500 degrees or less, and has good heat resistance, and some (e.g. TC1, TC2, TC3, TC4) and good low temperature toughness and good resistance to salt water stress corrosion and thermal salt stress corrosion.Shortcoming