NINGBO SITONGDA MOULD MANUFACTURING CO.,LTD
Add:No.429, Changluo Road, Luotuo Street, Zhenhai, Ningbo, Zhejiang
The choice of gasket material depends mainly on the following three factors: temperature pressure medium. At present, can be used to make gasket material is divided into two kinds, namely metal gasket material and non-metallic gasket material.
Metal gasket material
It is recommended that the maximum operating temperature does not exceed 538 ° C, especially when the medium is oxidizing. High-quality thin carbon steel plate is not suitable for the manufacture of inorganic acid, neutral or acidic salt solution equipment. Brinell hardness 120.
2. 304 stainless steel
18-8 (chromium 18-20%, nickel 8-10%), the recommended maximum operating temperature does not exceed 760 ℃. Brinell hardness 160.
3. 304L stainless steel
Carbon content of not more than 0.03%. Recommended maximum operating temperature does not exceed 760 ℃. Brinell hardness of about 140.
4. 316 stainless steel
18-12 (chromium 18%, nickel 12%), increased by about 2% molybdenum in 304 stainless steel, when the temperature increases its strength and corrosion resistance improved. When the temperature increases, it has higher creep resistance than other ordinary stainless steels. Brinell hardness of about 160.
5. 316L stainless steel
Recommended maximum continuous working temperature does not exceed 760 ℃ ~ 815 ℃. Brinell hardness of about 140.
6. 20 alloy
45% iron, 24% nickel, 20% chromium and a small amount of molybdenum and copper. Particularly suitable for the manufacture of sulfuric acid corrosion resistant equipment, Brinell hardness of about 160.
PTFE coated gaskets
Aluminum (content of not less than 99%). Aluminum has excellent corrosion resistance and processability, suitable for the manufacture of double sandwich pads. Brinell hardness of about 35.
The composition of copper is close to pure copper, which contains trace amounts of silver to increase its continuous operating temperature. Brinell hardness of about 80.
(Copper 66%, zinc 34%), in most working conditions, with good corrosion resistance, but not suitable for acetic acid, ammonia, salt and acetylene. Brinell hardness of about 58.
10. Hastelloy B-2
(26-30% molybdenum, 62% nickel and 4-6% iron). Recommended maximum operating temperature does not exceed 1093 ℃. Has excellent heat resistance to hydrochloric acid corrosion. Brinell hardness of about 230.
11. Hastelloy C-276
16-18% molybdenum, 13-17.5% chromium, 3.7-5.3% tungsten, 4.5-7% iron, and the rest are nickel). The Has excellent corrosion resistance. It has excellent corrosion resistance to boiling nitric acid or 70% boiling nitric acid, and has good resistance to hydrochloric acid and sulfuric acid corrosion and excellent stress corrosion resistance. Brinell hardness of about 210.
12. British Cornel 600
Nickel-based alloys (77% nickel, 15% chromium and 7% iron). In high temperature conditions with high strength, usually used to solve the problem of stress corrosion equipment. In the low temperature conditions, with excellent processing performance. Brinell hardness of about 150.
13. Monel 400
(Copper 30%, nickel recommended maximum continuous working temperature does not exceed 815 ℃. In addition to strong oxidizing acid, the majority of acid and alkali with excellent corrosion resistance in the fluorine acid, mercuric chloride, mercury medium prone to stress corrosion Cracks, and therefore, are not suitable for use in the above medium. Widely used in the manufacture of hydrofluoric acid equipment. Brinell hardness of about 120.
In high temperature conditions, with excellent corrosion resistance. It is well known that the resistance to chloride ions, in a wide range of temperature and concentration, with excellent resistance to nitric acid corrosion. Titanium is used in most alkaline solutions and is suitable for use in oxidative conditions. Brinell hardness of about 216.
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