Question 1: What is the standard of ASTM A691?
ASTM A691 is the standard of the American Society for Testing and Materials, and is the standard for electric fusion welded carbon steel and alloy steel pipes for high temperature and high pressure service conditions. In the international standard classification, this standard involves pipeline components and pipelines; in the Chinese standard classification, it involves steel pipes and cast iron pipes.
Question 2: What are the characteristics and uses of ASTM A691 Gr1 - 1/4CrCL22 electric fusion welded pipes?
ASTM A691 Gr1 - 1/4CrCL22 electric fusion welded pipes are American standard products. This type of steel has extremely high quality and performance requirements, and it is difficult to guarantee performance during production. Its characteristics and uses include: mainly used as power equipment welded pipes, suitable for pipelines such as refineries, power plants, and chemical plants. At present, the use of electric fusion welded pipes is becoming internationalized.
Question 3: What is the production and rolling process of SA691 Gr1 - 1/4CrCL22 electric fusion welded pipes?
The ordering and rolling process of SA691 Gr1 - 1/4CrCL22 is: raw materials → electric furnace → LF furnace (molten steel refining treatment) → ladle vacuum treatment (VD/VOD furnace) → mold casting/continuous casting → heating (electroslag remelting) → rolling → flaw detection and testing → heat treatment appearance quality inspection → quality inspection → storage.
Question 4: What is the relationship between ASTM A691 Gr1 - 1/4CrCL22 electric fusion welded pipe and seamless pipe SA - 335P22?
SA691 Gr1 - 1/4CrCL22 electric fusion welded pipe is equivalent to seamless pipe SA - 335P22. ASTM A691 is used as welded pipe, and SA - 335P22 is American standard seamless pipe.
Question 5: What do "1 - 1/4Cr" and "CL22" in ASTM A691 Gr1 - 1/4CrCL22 stand for?
"1 - 1/4Cr" indicates the grade of steel pipe, specifically 1 1/4% chromium, 1/2% molybdenum steel; "CL22" represents the heat treatment state.
