Formerly known as ASME SA105, ASTM A105 steel covers seamless forged carbon steel piping components that are used in pressure systems at both high-temperature and ambient service. Some of the products made out of this type of steel include fittings, valves, and flanges, as well as other parts that are usually special-ordered by customers.

Composition for the ASTM A105:

C
Mn
Mo
Ni
P
S
0.35% max
0.60-1.05%
0.12% max.
0.40% max.
0.035% max.
0.040% max.

For most items, heat treatment isn’t a necessity. One exception is for flanges above Class 300 and others. When heat treatment is required, the applied methods are always normalizing, annealing, normalizing and tempering, tempering, and normalizing and quenching.

Forging and Annealing

This type of steel is forged at 1700 to 2200° Fahrenheit and is followed by quenching and tempering. When annealing takes place, the forged parts are cooled down to below 1000° Fahrenheit, then reheated to 1550 to 1700° Fahrenheit, which is followed by slow-furnace cool-downs.

In addition, alloy steel manufacture companies usually offer ASTM A105 steel with a tensile strength of 70 KSI minimum, a hardness level of 187 HBW maximum, a basic minimum for walls 5/16” and over at 30%. If you take a look at the numbers associated with the mechanical properties of the steel, it will give you a better idea of the ins and outs of this type of steel. Customers can get just what they want because these manufacturers always offer customized products that ensure you get one that meets your needs.

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