ASTM A691 Grade 1 1/4Cr Alloy Welded Steel Pipe
ASTM A691 Grade 1 1/4Cr alloy welded pipe is a type of steel pipe made from an alloy material, specifically designed to meet the requirements of the ASTM A691 standard.
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The "1 1/4Cr" in the name indicates that the alloy contains approximately 1.25% chromium (Cr). Chromium is a key element that enhances the steel's high-temperature strength, corrosion resistance, and oxidation resistance.
Depending on the specific requirements, the alloy may also contain other elements such as molybdenum (Mo) to further improve its performance under high-temperature and high-pressure conditions.
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High-temperature resistance: The addition of chromium and other alloying elements gives the steel pipe excellent high-temperature stability, allowing it to maintain its mechanical properties at elevated temperatures.
: Chromium forms a passive oxide layer on the surface of the steel, which protects it from corrosion by various chemicals and environments.
: The alloy composition and manufacturing process result in a steel pipe with high tensile strength, yield strength, and toughness, making it suitable for demanding applications.
A691 Grade1 1/4 Cr chemical analysis:
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C |
P |
S |
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ASTM A691 Grade1 1/4 Cr |
0.05-0.17
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0.40- 0.65 |
0.035
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0.035 |
0.50-0.80
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1.00-1.50
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0.45-0.65 |
A691 Grade1 1/4 Cr physical property:
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Elongation in 8 in. [200mm], min % |
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ASTM A691 Grade1 1/4 Cr |
75-100 [515- 690] |
43 [310] |
18 |
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ASTM A691 Grade 1 1/4Cr alloy welded pipe is typically produced using electric fusion welding (EFW) or other suitable welding techniques.
The manufacturing process involves strict quality control measures to ensure that the pipe meets the specified chemical composition, mechanical properties, and dimensional tolerances.
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Due to its excellent combination of high-temperature resistance, corrosion resistance, and mechanical strength, ASTM A691 Grade 1 1/4Cr alloy welded pipe is widely used in the petroleum, chemical, and power industries.
It is commonly employed in high-temperature and high-pressure pipelines, heat exchangers, boilers, and other critical equipment where reliability and durability are paramount.
