Metal gasket material selection

Metal gasket material

1, carbon steel: recommended maximum operating temperature of not more than 538 degrees Celsius, especially when the medium with oxidation. High quality carbon steel plate is not suitable for the production of inorganic acid, neutral or acidic salt solution of the equipment, if the carbon steel under the stress, for hot water conditions of the equipment accident rate is very high. Carbon steel gaskets are usually used for high concentration of acid and many alkali solutions. The hardness is about 120.

2, 304 stainless steel 18-8 (CR 18-20%, Ni 8-10%), the recommended maximum operating temperature of not more than 760. Stress corrosion and grain boundary corrosion are easy to occur in the temperature range of -196~538. Hardness 160.

3, 304L stainless steel carbon content is not more than 0. 03%. Recommended maximum operating temperature of not more than 760. Corrosion resistance similar to 304 stainless steel. Low carbon content reduced the amount of carbon from the crystal lattice, and the resistance to grain boundary corrosion was higher than that of 304 stainless steel. The hardness is about 140.

4, 316 stainless steel 18-12 (CR 18%, Ni 12%), in the 304 stainless steel to increase about 2% molybdenum, when the temperature increases its strength and corrosion resistance. When the temperature is higher than other ordinary stainless steel has a higher creep resistance. Recommended maximum operating temperature of not more than 760. The hardness is about 160.

5, 316L stainless steel recommended maximum continuous operating temperature is not more than 760 degrees C ~815. Carbon content is not more than 316 stainless steel with a better resistance to stress and grain boundary corrosion. The hardness is about 140.

6, 20 alloy 45% iron, 24% nickel, 20% chromium and a small amount of molybdenum and copper. Recommended maximum operating temperature is not more than 760 degrees C ~815. Particularly suitable for the manufacture of sulfuric acid corrosion resistance equipment, the hardness of about 160.

7, aluminum and aluminum (content of not less than 99%). Aluminum has excellent corrosion resistance and processing performance, suitable for the manufacture of double clamp gasket. The hardness is about 35. Recommended maximum continuous operating temperature of not more than 426.

8, the copper copper composition close to pure copper, the trace amounts of silver to increase its working temperature. Recommended maximum continuous operating temperature of not more than 260. The hardness is about 80.

9, brass (copper 66%, zinc 34%), under most conditions, with good corrosion resistance, but not to the acetic acid, ammonia, salt and acetylene. Recommended maximum continuous operating temperature of not more than 260. The hardness is about 58.

10, ha's B-2 (26-30% molybdenum, 62% nickel and 4-6% iron). Recommended maximum operating temperature of not more than 1093. Corrosion resistance of hydrochloric acid with excellent heat resistance. Also has excellent resistance to wet hydrogen chloride gas corrosion, sulfuric acid, phosphoric acid and reducing salt solution corrosion performance. High strength at high temperature. The hardness is about 230.

11, ha's 16-18% C-276 molybdenum, 13-17.5% chromium, 3.7-5.3% tungsten, 4.5-7% iron, and the rest are nickel. Recommended maximum operating temperature of not more than 1093. Excellent corrosion resistance. The boiling nitric acid has excellent corrosion resistance, good resistance to hydrochloric acid and sulfuric acid corrosion resistance and excellent resistance to stress corrosion resistance, which can be achieved in a variety of cold nitric acid or concentration of 70%. The hardness is about 210.

12, Inconel 600 Ni base alloy (77%, 15% and 7% nickel chromium iron). Recommended maximum operating temperature of not more than 1093. Under high temperature conditions, a high strength is usually used to solve the problem of stress corrosion. At low temperature, the same processing performance is excellent. The hardness is about 150.

13, Monel 400 (30% copper and nickel recommended maximum working temperature not exceeding 815 DEG C. In addition to strong oxidizing acids, most of the acids and bases have excellent corrosion resistance. In fluoride acid, mercuric chloride, mercury medium susceptible to stress corrosion cracking, therefore, is not suitable for the medium. The equipment is widely used in the manufacture of hydrofluoric acid. The hardness is about 120.

14, titanium recommended maximum operating temperature of not more than 1093. Under high temperature conditions, the corrosion resistance is excellent. As is known to all, the corrosion resistance of chloride ions, in a wide range of temperature and concentration, has excellent corrosion resistance to nitric acid. Titanium material is rarely used in most alkaline solutions, suitable for oxidation conditions. The hardness is about 216.