News

Which is better, titanium alloy or stainless steel?

The difference between titanium and titanium alloys and stainless steel

The density of titanium and titanium alloys is only 4.51, which is smaller than steel and only half the weight of steel, but their strength is similar to that of ordinary carbon steel. Titanium belongs to thermodynamically unstable metals and is very active. Titanium metal can form a natural oxide film (titanium dioxide) with air. This stable, strong adhesion, and protective oxide film determines the corrosion resistance of titanium. Therefore, titanium has excellent corrosion resistance. In addition, its light texture, high tensile strength, and good mechanical properties are other excellent characteristics of titanium alloys.

Titanium alloys can be classified according to their uses: corrosion-resistant titanium alloys, structural titanium alloys, heat-resistant titanium alloy gold, and low-temperature titanium alloys.

1. It can be distinguished by color. Titanium is a bit dark, emitting a cool color that feels cool. Titanium is a bit darker than steel. Steel is the kind of white, pale. The two colors are quite noticeable.

2. It can also be distinguished by chemical methods, which involve soaking with nitric acid. Titanium does not react, stainless steel will undergo a strong reaction when placed down. It is difficult to distinguish between pure titanium and titanium alloys from their appearance.

Titanium can leave gray black marks on ceramic tiles, but stainless steel cannot.

4. Good corrosion resistance of titanium: Titanium alloys are prone to forming a dense oxide film below 550 ℃, so they are not easily further oxidized. They have high resistance to corrosion in gases, seawater, steam, as well as some acid, alkali, and soft media.

5. Good thermal strength of titanium: Titanium alloy has a melting point of 1660 ℃, which is higher than iron and has higher thermal strength. It can work below 550 ℃ and exhibits good toughness at low temperatures.

6. Difficulty in titanium processing: Welding, electroplating, and cold stretching are very difficult. Welding and electroplating must be carried out under vacuum or in a state filled with inert gas (vacuum ion plating)

Titanium alloys are widely used in various fields due to their high strength, good corrosion resistance, and high heat resistance.

The density of titanium alloys is generally around 4.51g/cubic centimeter, which is only 60% of that of steel. The density of pure titanium is only close to that of ordinary steel, and some high-strength titanium alloys exceed the strength of many alloy structural steels. 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, which can produce components with high unit strength, good rigidity, and light weight. The engine components, frame, skin, fasteners, and landing gear of the aircraft are all made of titanium alloy.

304 is a versatile stainless steel widely used in the production of equipment and components that require good comprehensive performance (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, it must contain more than 18% chromium and more than 8% nickel.

The density is 7.93 g/cm3, also known as 18/8 stainless steel in the industry. High temperature resistance of 800 degrees, with good processing performance and high toughness, widely used in industrial and furniture decoration industries, as well as food and medical industries.

Of course, titanium alloy is better than 304 in terms of high strength, low density, and corrosion resistance

[ 上一页 ] Can the anode be r...[ 下一页 ] Analysis of common...