A106B Steel Pipe

A106 steel’s chemical composition is similar to that of A53 Grade B and API 5L B. Its carbon content maxes out at 0.3% and its nickel at 0.4%. Its manganese minimum must fall between 0.29% and 1.06%.

Grade B maintains a higher carbon content than grade A but less than grade C. For each reduction of 0.01% of the maximum carbon amoun, manganese may increase 0.06% above the specified value up to a maximum of 1.35%.

The differences in chemistry between A53 and A106 seem minor, but they are important. A53 steel may include silicon, but A106 steel must include at least 0.10% silicon in the alloy. Silicon is an important component in heat resistance ability.

A106 steel must be produced with killed steel — a totally deoxidized alloy that features a high degree of chemical homogeneity. In killed steel, no reaction occurs between the carbon and the oxygen during solidification. Consequently, the product is more chemically uniform.

In general, carbon steel is simple to process and relatively inexpensive. It works well under pressure and features good mechanical properties.

Like other carbon steels, A106 is stable, durable, safe, cost effective, and recyclable.

Specifically, A106 steel is resistant to high pressure and heat. This type of steel undergoes hydrostatic testing after production. The test pressure stands at 2500 psi for sizes NPS 2 and under and maintained for at least five seconds. Manufacturers may elect to do nondestructive electric testing in lieu of hydrostatic testing.

These high-pressure, high-temperature steel pipes are extremely strong and resist corrosion. They perform better when exposed to intense heat. These pipes are sturdy, precisely constructed, and durable. They last a long time.

Because it is a seamless steel, A106 grade B pipe may be stronger than welded pipe because it lacks the seam. Modern manufacturing practices, however, create welded pipe that is as structurally stable and high performing as seamless pipe.

In fact, seamless pipe is certainly more expensive than welded pipe, and it may show an inconsistent wall thickness due to the stretching and rolling process it undergoes. In structural applications, the two types of steel perform equally well.

Welded steel is cheaper and more readily available than seamless steel. For high temperature applications, however, consumers must use seamless steel such as A106 to meet industry standards.

Industries that require high-pressure, high-temperature piping for transporting liquids typically use A106 steel. Oil and gas, power generation, and pharmaceutical industries all typically use A106. Other industries that use A106 grade B steel include food and beverage, hydraulics, mining, and construction.

A106 steel pipe can be used in constructing gas or oil refineries, petrochemical plants, power plants, boilers, or ships that transport gases or fluids at high temperatures and pressure levels. Structural applications, spreader bars, and mechanical components may also use this type and grade of steel.

Carbon content determines ease of machinability. Steel with a carbon content of 0.2-0.3 percent is the easiest steel to machine and fabricate. A106 steel has a carbon content of 0.3, but its relatively high nickel content works against machinability. Thus, this steel is easier to machine than many metal materials, but less than others, putting it around the median of machinability.

A106 steel cannot be welded. It must be seamless.

Type A106 steel can either be hot finished or cold drawn. Hot finished steel is worked at temperatures over 1700 degrees F while cold drawn steel is worked at room temperatures. Due to the nature of the material, hot finished steel is generally stronger. Hot finished pipe does not require heat treatment. Generally, A106 grade B pipe on and over NPS 2″ is hot finished.

A cold finished product has absorbed the stress of the hardening process, thus it may be slightly less hard. It should, however, offer greater aesthetics, better dimensional control, and a smoother surface condition. Cold drawn A106 steel must be stress relieved at temperatures of 1200 degrees F or higher.