What is the difference between A105 and A106?

Answer 1

Difference Between ASTM A105 and A106

Chemical Composition

ASTM A105 and A106 contain similar chemical compositions of carbon, manganese, phosphorus, sulfur, and silicon. However, the percentage of each element is different in A105 and A106 according to their standards.

ASTM A105 is a forged carbon steel with a maximum carbon content of 0.35%, while A106 is a seamless carbon steel pipe with a full carbon content of 0.30%. Hence, the chemical composition gives A105 a slightly higher tensile strength and yield point, whereas A106 offers better flexibility.

Manufacturing Method

ASTM A105 fittings are manufactured by forging, while A106 pipes are produced through a seamless manufacturing process. This means that A106 pipes do not have a welded seam, making them ideal for high-pressure or high-temperature applications where welds can fail.

On the other hand, removing the seam in A106 pipes reduces the wall’s thickness, resulting in a lower tolerance for bending. In comparison, A105 fittings can be bent or forged into complex shapes, making them perfect for manufacturing various industrial fittings.

Temperature Limitations

ASTM A105 provides a reliable source of various temperature ratings with the required reports and testing. It is designed to withstand temperatures from -29°C to 537°C. This characteristic makes ASTM A105 fittings ideal for high-heat applications and industrial settings where components are exposed to high temperatures.

In comparison, ASTM A106 is recommended for temperatures below 450°C because it is less heat-resistant. The maximum operating temperature for A106 pipes is around 425°C.

Cost

Regarding cost, ASTM A105 fittings are generally more expensive than A106 pipes. This is mainly because of its extra strength and stability to withstand higher-pressure systems.

However, the overall cost of your project will depend on various factors, such as manufacturing, transportation, and installation costs, amongst others. Hence, evaluating your industrial project’s requirements is essential before selecting a material.

Reference : the blog : thepipingmart com

Answer 2

The difference between A105 and A106 is dependent upon the reference from which it is derived. In many situations A105 is one less than A106.