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Process Piping Materials – Module 2 – M06-036 |
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Standards - Pipes |
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ASTM A335: |
Seamless Ferritic Alloy Steel pipe for High Temperature |
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Services. |
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A 335 Gr P I / P II is used for superheated high pressure |
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Steam Lines. |
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ASTM A369: |
Carbon & Ferritic Alloy Steel forged and bored pipe for high |
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temperature service |
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ASTM A691: |
Carbon and Alloy Steel pipe (Electric Fusion Welded for High |
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Pressure Service at High Temperature) |
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ASTM A333: |
Low Temperature Services, Gr. 3 |
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Fittings |
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ASTM A234: |
High Temperature Services |
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ASTM A217: |
Martensitic Stainless Steel and Alloy Steel castings for |
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valves, flanges, fittings and other pressure-containing parts |
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intended primarily for high-temperature and corrosive service. |
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ASTM A420: |
Piping Fittings of Wrought Carbon Steel and Alloy Steel for |
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Low Temperature Service |
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ASTM A860: |
Standard Specification for Wrought High Strength Low Alloy |
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Steel Butt Welding Fittings |
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Forgings |
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ASTM A182: |
High Temperature Services |
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ASTM A350: |
Forged Carbon and Low Alloy Steel requiring Notch |
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Toughness testing. |
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2.6.2. High Alloy Steel Characteristics
Steels containing 5% or more of alloying metals are generally called high alloy steels. Chromium steel and Stainless steel belongs to this category in medium temperature ranges. But at higher temperatures, a complex variety of alloy materials are used. These are discussed below.
2.7.Chromium Steel Pipes
Process chemicals with ample amounts of sulfur compounds become quite corrosive to steel at temperatures from about 550°F/290°C to 840°F/450°C. Chromium steels containing 12 to 17% chromium can very well resist these corrosive attacks.
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