Introduction

According to the different impurity content of industrial pure titanium, it is divided into GR2, GR1 two brands. The gap impurity elements of these two kinds of industrial pure titanium are gradually increased, so their mechanical strength and hardness also increase step by step, but the plasticity and toughness decrease correspondingly.

Gr 1 titanium bar is commonly used in industry because of its moderate corrosion resistance and comprehensive mechanical and physical properties. GR1 can be used when wear resistance and strength requirements are high. GR1 can be used when better molding performance is required.

Gr 1 titanium bar has good low temperature toughness and high low temperature strength when iron content ω is 0.095%, oxygen content ω is 0.08%, hydrogen content ω is 0.0009%, nitrogen content ω is 0.0062%, and can be used as low temperature structural materials below -253℃.

Gr1 Composition and content of pure titanium alloy

Hydrogen(H)：≤0.015 ;Oxygen(O)：≤0.25 ;Carbon (C)：≤0.10 ;Silicon( Si)：≤0.15 ;Ferrum(Fe)：≤0.30 ;Nitrogen (N)：≤0.05;TItanium (Ti)：remains

Mechanical and physical properties

strength of extension σbMpa：441

Elongation δ5%：20

yield strength σ0.2Mpa：373

Shrinkage ψ%：40

extend rate %：25

Tensile Strength MPa：440-590

Cold bending Angle：90 heat treatment state：annealing

State of supply

Polishing, annealing state, cold working state, round, straight, super elastic processing

Gr 1 titanium bar -product detailed display:

Our quality control system

Property

Titanium is a new kind of metal, the performance of titanium is related to the content of carbon, nitrogen, hydrogen, oxygen and other impurities, pure titanium iodide impurity content is not more than 0.1%, but its low strength, high plasticity. The properties of 99.5% industrial pure titanium are as follows: density ρ=4.5g/cm3,

(1) High strength

The density of titanium alloy is generally about 4.5g/cm3, only 60% of steel, the strength of pure titanium is close to the strength of ordinary steel, some high strength titanium alloy exceeds the strength of many alloy structural steel. Therefore, the specific strength (strength/density) of titanium alloy is much higher than that of other metal structural materials, as shown in Table 7-1. It can produce components with high unit strength, good rigidity and light weight. At present, titanium alloy is used for engine components, skeleton, skin, fasteners and landing gear.

(2)Maximum heat strength

The use of temperature is several hundred degrees higher than aluminum alloy, at moderate temperature can still maintain the required strength, can work in 450 ~ 500℃ temperature for a long time these two types of titanium alloy in the range of 150℃ ~ 500℃ still has a high specific strength, and aluminum alloy at 150℃ than the strength decreased significantly. The working temperature of titanium alloy can reach 500℃, and that of aluminum alloy is below 200℃

(3) Good corrosion resistance

The corrosion resistance of titanium alloy is much better than that of stainless steel when working in humid atmosphere and seawater medium. Resistance to pitting corrosion, acid corrosion, stress corrosion is particularly strong; Excellent corrosion resistance to alkali, chloride, chlorine organic articles, nitric acid, sulfuric acid and so on. But titanium has poor corrosion resistance to reducing oxygen and chromite medium.

(4) Good low temperature performance

Titanium alloy can keep its mechanical properties at low temperature and ultra low temperature. Titanium alloys with good low temperature performance and very low clearance elements, such as TA7, can maintain certain plasticity at -253℃. Therefore, titanium alloy is also an important low temperature structural material.

(5) Large chemical activity

Titanium has high chemical activity, and has strong chemical reaction with O, N, H, CO, CO2, water vapor and ammonia in the atmosphere. When the carbon content is greater than 0.2%, hard TiC will be formed in titanium alloy. When the temperature is higher, TiN hard surface layer can be formed by the interaction with N. Above 600℃, titanium absorbs oxygen to form a hard layer with high hardness. When hydrogen content increases, embrittlement layer will also be formed. The depth of hard brittle surface produced by gas absorption can reach 0.1 ~ 0.15mm, and the hardening degree is 20% ~ 30%. Titanium chemical affinity is also large, easy to friction surface adhesion phenomenon.

(6) Small thermal conductivity and elastic modulus

Thermal conductivity of titanium λ=15.24W/ (m.K)
Titanium alloy products is about 1/4 of nickel, 1/5 of iron, 1/14 of aluminum, and the thermal conductivity of various titanium alloys is about 50% lower than that of titanium. The elastic modulus of titanium alloy is about 1/2 of steel, so its rigidity is poor, easy deformation, should not make slender rod and thin wall parts, cutting the processing surface of the springback is very large, about 2 ~ 3 times of stainless steel, resulting in severe friction, adhesion, adhesion wear of the tool surface.

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