Whether you are in the market for Astm A193 Grade B7 round bars or other types of steel, you will want to make sure you purchase from a reputable company. There are many important factors, such as the chemical composition, strength, and testing requirements. It would help if you always chose a manufacturer that is familiar with all of these things to ensure you are getting the best product.

Chemical composition requirements

Generally, ASTM A193 Grade B7 round bars are made from heat-treated chromium molybdenum steel. The alloys provide good strength and resistance to corrosion. This makes them a good option for process industries and petroleum plants. The ASTM A193 Grade B7 material is also suitable for applications that have high temperatures and high pressure. They can be plated with zinc or hot-dip galvanization to enhance their corrosion resistance. They are available in a variety of diameters and finishes. However, this may reduce their heat-bearing capacity. The minimum yield strength for B7 is 105 KSI, and the maximum hardness is 35 HRC. A193 Grade B7 is often used in medium to high-temperature environments. Also, it is a typical material specification for applications in the oil and gas industry. It is also found in valves, construction equipment, and domestic appliances. It is commonly available in national course (UNC) thread pitches.

Strength requirements

Typical applications for ASTM A193 Grade B7 round bars are pressure vessels and other high-temperature/high-pressure applications. These bars are made from medium carbon alloy steel and chromium-molybdenum. They are commonly used in pipe flange connections. A193 bars are sometimes coated to improve corrosion resistance. Also, several grades are available. While each has its unique applications, the requirements for the material and testing are relatively similar. For example, most specifications have hardness, tensile, and elongation requirements. In addition, different finishes may affect the temperature rating. Nevertheless, each grade has its chemical requirements.

A continuous casting process manufactures A193 Grade B7 round bars. The bar is quenched and tempered. This two-step heat treatment process aligns the mechanical properties with the ASTM specification. This means that A193 Grade B7 bolts can be galvanized without compromising hydrogen embrittlement. In other words, they are used in various temperatures and conditions.

Testing requirements

Typically used for valves, pressure vessels, and other high-temperature applications, the ASTM A193 Grade B7 specification covers a variety of mechanical properties. It also includes several alloying elements, such as chromium, molybdenum, columbium, aluminium, and boron. These metals have different tensile strengths and hardnesses, measured on a scale.

The primary alloying content is chromium, but the number of other elements changes the composition. The material must be tempered at a minimum of 620C. This process brings the product’s mechanical properties in line with the ASTM specification. The A193 B7 specification also specifies a preferential heat treatment, which increases the tensile strength and hardness of the material. Compared to other grades, A193 Grade B7 is more durable. This material is primarily used in high-temperature applications but can be found in various other applications. 


Typical applications of ASTM A193 Grade B7 round bars are flange connections, pressure vessels, industrial applications, high-temperature service and industrial piping applications. These products are made from alloy steel and are manufactured by quenching and tempering processes. These processes result in increased tensile strength and flexibility, which can reduce potential galling. B7 alloy steel is a chromium molybdenum steel that is heat treated to obtain desired mechanical properties. This process can be carried out in various ways. Sometimes, the material is quenched in water and then treated with a carbide solution.

In some cases, it is heat treated using hot dip galvanizing. During the heat-treating process, the alloy steel is quenched in temperatures up to 1150 degrees Fahrenheit. It is then tempered to increase its tensile strength and flexibility.