ASTM A333Gr.6 Low-temperature Steel Seamless Steel Pipe

ASTM A333Gr.6 low-temperature steel seamless steel pipe is a seamless pipe designed for low-temperature environments. The following is a detailed introduction from the aspects of standards, specifications, performance, and applications:

Implementation standards

ASTM A333Gr.6 low-temperature pipelines follow the ASTM A333/A333M standard, which is the technical requirements standard for seamless steel pipes and welded steel pipes for low temperatures issued by the American Society for Testing and Materials. This standard ensures the performance stability and safety of steel pipes in low-temperature environments.

Specification range

1. Outer diameter range

Usually from 21.3mm to 762mm, even larger sizes such as 1240mm can be customized to meet different engineering needs.

2. Wall thickness range

The wall thickness ranges from 2.0mm to 140mm, supporting a variety of wall thickness grades, such as SCH5S to XXS, providing flexible selection space.

3. Spot specifications

Common spot specifications include multiple combinations of outer diameter 8-1240mm and wall thickness 1-200mm, which are convenient for quick procurement and use.

Performance characteristics

1. Chemical composition

Carbon content ≤0.30%, manganese content 0.29-1.06%, silicon content ≥0.10%, phosphorus and sulfur content ≤0.025%. The precise control of these elements ensures the low-temperature toughness and strength of seamless steel pipes.

2. Mechanical properties

Tensile strength ≥415MPa, yield strength ≥240MPa, elongation ≥30%. These performance indicators ensure the bearing capacity and plastic deformation capacity of steel pipes in low-temperature environments.

3. Low-temperature toughness

Under low-temperature conditions of -45℃, seamless steel pipes can still maintain good impact toughness and avoid the risk of brittle fracture.

Production process

1. Steelmaking process

Advanced steelmaking technology, such as electric furnace steelmaking or converter steelmaking, is used to accurately control the chemical composition and remove impurity elements.

2. Forming process

There are mainly two types: hot extrusion and cold drawing. The hot extrusion process makes the internal structure of the steel more uniform, while the cold drawing process improves the dimensional accuracy and surface quality, and is often used in the manufacture of precision tubes.

3. Heat treatment process

Normalizing or normalizing plus tempering heat treatment is usually used to refine the grains and improve the strength and toughness of the steel.

Advantages

1. Good low temperature performance

A333GR.6 steel pipe adopts special alloy composition and process, has a lower brittle transition temperature and higher impact toughness, and can maintain stable performance in extremely cold environments.

2. High mechanical strength

A333GR.6 seamless steel pipe has high yield strength and tensile strength, can withstand greater pressure and load, and ensure the safety and stability of the project.

3. Good weldability

The chemical composition and process control of A333GR.6 steel pipe make it have good weldability and can meet various connection requirements in the project.

4. Strong corrosion resistance

A333GR.6 seamless steel pipe adopts high alloy composition, has good corrosion resistance, can resist erosion by various corrosive media, and prolong service life.

Application areas

1. Petrochemical industry

Used in manufacturing equipment such as reactors, heat exchangers, separators, and storage and transportation systems for low-temperature chemicals.

2. Deep processing of natural gas and coal

In cold areas, when transporting oil and natural gas, etc., or some low-temperature chemical media, ensure the normal operation of the pipeline system.

3. Refrigeration industry

Used in the low-temperature pipeline part of refrigeration equipment, such as refrigerant delivery pipelines in large cold storages.

4. Polar scientific research facilities and liquefied carbon dioxide transportation

In low-temperature environments such as polar regions, ensure the safe and reliable operation of pipes, suitable for use with drill pipes and other structural components.

Read more: ASTM seamless steel pipe main material standards