Alloy Pressure Pipe: Product Standards, Packaging, Technology and Precautions

Alloy Pressure Pipe

Product Standards

Alloy pressure pipes comply with a series of international and domestic standards to ensure their quality and performance.

ASTM Standards: For example, ASTM B705 covers nickel - alloy (UNS N06625, N06219, and N08825) welded pipes in the annealed conditionASTM International. The pipes shall be manufactured from flat - rolled alloy by an automatic welding process with no additional filler metal, and shall be cold - worked, annealed, and nondestructively testedASTM International. They must meet the requirements of tensile, yield, elongation, transverse guided bend, and nondestructive testsASTM International.
GB Standards: In China, there are also relevant standards for alloy pressure pipes. For instance, GB/T 3199 - 2007 is related to the marking of aluminum alloy pipes, which stipulates the information that should be clearly marked on the pipes, such as the production batch number, alloy model, specification, length, and weight.

Proper packaging is crucial for protecting alloy pressure pipes during transportation and storage.

Packaging Materials: Anti - corrosion materials such as composite kraft paper and PE winding film are used to wrap the pipe body to prevent contact with acids, alkalis, and salts. Plastic corner protectors or foam plugs are installed at the ends of the pipes to prevent collision deformation. For bare materials, protective films are pasted on the surface, and the profiles are bundled and then wrapped with textile belts for fixation to avoid friction and scratching.
Packaging Structure: Custom - made wooden boxes or steel frame structures are adopted, and honeycomb cardboard/EPE buffer materials are filled inside to ensure that the pipes do not move. The weight of a single box does not exceed the transportation limit. For extra - long pipes, they are packaged in sections and marked with splicing marks.
Marking and Labeling: The production batch number, alloy model, specification, length, weight, and the standard number (such as GB/T 3199 - 2007) should be clearly marked. Fragile labels, rain - proof signs, and stacking direction arrows should comply with the GB/T 191 specification.

The manufacturing process of alloy pressure pipes is complex and requires strict control.

Raw Material Preparation: High - purity alloy elements are strictly screened to ensure the quality of the raw materials.
Smelting: Arc furnaces or induction furnaces are usually used, and for some high - performance alloys, vacuum induction melting and electroslag remelting double - process may be adopted.
Casting: The molten alloy is cast into alloy ingots.
Piercing (for Seamless Pipes): The heated alloy ingot is fed into the piercing equipment, and holes are punched in its center part to form a hollow tubular structure.
Rolling: Hot rolling is suitable for the production of large - diameter pipes, while cold rolling is used for the manufacture of thin - walled pipes with finer dimensional control and surface finish requirements.
Heat Treatment: Solution treatment, aging treatment, etc. are carried out to improve the mechanical properties and microstructure of the pipes.
Surface Treatment: According to customer requirements, surface treatments such as painting, galvanizing, or coating with FBE, 2PE, 3PE, etc. can be carried out.
Testing: Various tests are carried out, including nondestructive testing (such as hydrostatic, pneumatic, eddy current, ultrasonic, leak, and electric testing), as well as tensile, yield, and elongation tests to ensure that the quality of the pipes meets the standards and customer requirementsASTM International.

When using alloy pressure pipes, the following points should be noted.

Pressure Limit: The pressure - bearing capacity of alloy pressure pipes is limited. It is necessary to determine the appropriate pressure grade according to the specific use environment and engineering requirements.
Temperature Limit: The high - temperature resistance of some alloys is relatively poor. In high - temperature environments, appropriate protective measures should be taken to prevent softening and deformation of the pipes.
Installation and Dismantling: When installing and dismantling the alloy pipes, be very careful to prevent scratches or bumps on the pipe surface. After installation, lubricate the pipe diameter and check and adjust the pipe to the zero level.
Regular Maintenance: The inner surface of the alloy pipes may store sediments due to roughness, which affects the transportation efficiency. Therefore, the pipeline system should be regularly cleaned and maintained to ensure its normal operation.