GR1 Titanium Bar

Titanium bar and titanium alloy bar is a new type of structural material, because titanium has high melting point, small specific gravity, high specific strength, good toughness, fatigue resistance, acid and alkali corrosion resistance, low thermal conductivity, good high and low temperature resistance, and low stress under rapid cooling and heating conditions. It is used in aviation, aerospace and other high-tech fields, and is constantly promoted to the chemical industry, petroleum, electric power, seawater desalination, construction, daily necessities and other industries.

Implementation Standards

There are two kinds of titanium rod executive standards:

Chinese standard: GB/2965-2007, GB/T13810

American standard: ASTM B348, ASTM F136, ASTM F67, AMS4928.

 

Titanium Rod Grade

Chinese grade: TA1,TA2,TA3,TA7,TA9,TA10,TA15,TA18, TC4,TC4ELI,TC6,TC9,TC10,TC11

American grade:GR1,GR2,GR3,GR4,GR5,GR7,GR11,GR12,GR23

 

Production Process

Titanium bar production process: hot forging - hot rolling - annealing and straightening - turning (grinding) - polishing - flattening - inspection - packaging.

Specification of titanium rods: (Diameter*Length/mm): 6mm-250mm*L.

Titanium bar supply state: hot working state, annealed state.

Titanium Rod Technical Requirements

1, the chemical composition of titanium and titanium alloy bars should be consistent with the provisions of GB / T 3620.1, need to be repeatedly tested, the allowable deviation of the chemical composition should be consistent with the provisions of GB / T 3620.2.

2, the diameter or length of hot-worked bar and its allowable deviation should be consistent with its provisions.

3, hot machining by turning (grinding) light bar and cold rolled, cold drawn bar diameter tolerance shall comply with its provisions.

4, hot machined by turning (grinding) light bar should not be more than half of the size tolerance of the out-of-roundness.

5, the processing state of the bar's unsized length of 300-6000mm, annealed state of the bar unsized length of 300-2000mm, fixed or times the size of the length should be within the length of unsized. Fixed length allowable deviation of +20mm; times the length of the bar should also be counted in the amount of the cut, each cut amount of 5mm. fixed or times the length should be specified in the contract.

 

Mechanical Properties

The mechanical properties excerpted from ASTM B265 standard are as follows:

Tensile strength: σb ≥ 240Mpa, yield strength: σb ≥ 138Mpa , elongation: δ ≥ 24%,reduction:Ψ≥30%.

 

Advantages of titanium and titanium alloy
1, Good corrosion resistance. Titanium alloy in the humid atmosphere and seawater media work, its corrosion resistance is far better than stainless steel; pitting, acid corrosion, stress corrosion resistance is particularly strong; alkali, chloride, chlorine, organic items, nitric acid, sulfuric acid, etc. have excellent corrosion resistance. But titanium has a reducing oxygen and chromium salt media corrosion resistance is poor.

2, Good low temperature performance. Titanium alloy at low temperature and ultra-low temperature, can still maintain its mechanical properties. Good low-temperature performance, very low gap element titanium alloy, such as TA7, in -253 ℃ can also maintain a certain degree of plasticity. Therefore, titanium alloy is also an important low temperature structural material.

3, CHemical activity. Titanium's chemical activity is large, with atmospheric O, N, H, CO, CO2, water vapor, ammonia and other strong chemical reactions. When the carbon content is greater than 0.2%, hard TiC will be formed in titanium alloys; when the temperature is higher, the role of N will also form a hard surface layer of TiN;

Above 600℃, titanium absorbs oxygen to form a hardened layer with high hardness; the rise of hydrogen content will also form an embrittled layer. Absorption of gas and the resulting hard brittle surface layer depth of up to 0.1 ~ 0.15 mm, the degree of hardening for 20% to 30%. Titanium's chemical affinity is also large, easy to produce adhesion with the friction surface.

4, Thermal conductivity and elasticity is small. Titanium's thermal conductivity λ = 15.24W/(m.K) is about 1/4 of nickel, 1/5 of iron, 1/14 of aluminum, and various titanium alloys have a thermal conductivity coefficient that is about 50% lower than that of titanium.

The modulus of elasticity of titanium alloy is about 1/2 of steel, so its rigidity is poor, easy to deform, not suitable for making slender rods and thin-walled parts, and the rebound of the machined surface when cutting is very large, about 2 to 3 times as much as stainless steel, resulting in sharp friction, adhesion and bonding wear of the tool's rear blade surface.

 

GR1 Titanium Products

 Tel: 0917-3381220

 Phone: +86 15353021135

 Email: wilson@kehuititanium.com

 Wechat: +86 15353021135

 Address: Gaoya industrial park, High-tech Development Zone, Baoji city, Shaanxi province, China

 

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