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CHROMIUM-NICKEL TYPES: Hardenable by Cold-Working. Normally Non-Magnetic |
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Types 302, 304 and 304 |
Resists corrosion remarkably well. They are entirely unaffected by nitric acid, cold acetic acid, citric acid, milk, food products, fruit juices and many common corrosive agents encountered in industry. These three types respond to almost every type of fabrication, have excellent cold-forming properties and fair machining properties. They can be hardened only by cold-working. |
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Type 303 |
Exceptional non-galling and non-seizing properties, in addition to a high degree of resistance to nitric, acetic and citric acids, milk, food products, fruit juices and many other common corrosive agents. It can be hardened only by cold-working. It will be found highly satisfactory for use in parts subjected to friction, as in valves and pumps. |
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Type 16-18 (Carpenter 10) |
A modified austenitic 18-8 stainless steel particularly suited for severe cold forming operations such as Phillips Head Screws. It remains non-magnetic even after severe cold working. Corrosion resistance is slightly better than Types 302, 303 and 304. |
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Type 316 |
The most corrosion-resistant of the commonly used grades of stainless steel. The addition of molybdenum to the chromium-nickel stainless steels definitely increases their resistance to non-oxidizing acids, such as sulphuric, phosphoric and acetic. |
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Type 317 |
Widely used in the paper industry for equipment coming in contact with corrosive sulphite liquids, and in the textile industry for handling many mineral and organic acids, dyes and bleaches. Ease of cleaning and lack of contamination form metallic salts are important requirements, especially in the textile industry, and Type 317 has proved entirely satisfactory for many such applications of severe nature. This grade can be hardened only by cold-working. |
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Types 309 and 310 |
With a still higher alloy content, these are resistant to a wide variety of corrosive agents. They are primarily valuable for use in high temperature service. |
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STRAIGHT-CHROMIUM TYPES: Hardenable by Heat Treatment. Magnetic |
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Type 410 |
Resists corrosion caused by atmospheric conditions, food acids, mine water and gasoline, to mention but a few examples. It can be hardened up to 401 Brinell. |
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Type 416 |
Primarily characterized by outstanding free-machining and non-galling properties. Its corrosion resistance resembles that of Type 410 and it can be hardened up to 388 Brinell. |
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Type 420 |
Resistant to fruit and vegetable juices, alkalis and sterilizing agents. It is a widely used cutlery type alloy that can be hardened up to 550 Brinell, and is most satisfactory when fully hardened. |
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Type 440 |
A modified cutlery type. It can be hardened up to 575 Brinell. With polished surfaces, fully hardened, it develops maximum resistance to the attacks of fruit and vegetable juices, alkalis and sterilizing agents. |
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STRAIGHT-CHROMIUM TYPES: Non-Hardenable by Heat Treatment. Magnetic |
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Type 430 |
In its normal state, stauchly resists nitric acid, food products, some organic acids, salt water and other corrosive agents. It offers good cold-forming and machining properties. |
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Type 430F |
Combines outstanding free-machining qualities with good resistance to nitric acid, food products, some organic acids and salt water. It has fair cold-forming properties and can be used for applications where Type 430 is satisfactory. |
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Type 446 |
Primarily a heat-resisting metal, intended for use in parts subjected to oxidation at high temperatures and little stress. It resists nitric acid, some molten salts and hot sulphur-bearing gases. |