ASTM A278 class 35C Properties and Aplications

ASTM A278 class 35C is a grade of carbon steel and low alloy steel castings that has a minimum tensile strength of 35,000 psi (240 MPa), a minimum yield strength of 22,000 psi (150 MPa), and a minimum elongation of 22%. This grade of cast steel is commonly used in general-purpose applications that require good strength and toughness, as well as resistance to wear and corrosion.

In ASTM A278, the letter "C" following the numerical value, such as "35C", indicates that the material is a carbon steel casting. The "C" designation is used to distinguish carbon steel castings from other types of castings, such as alloy steel or stainless-steel castings, which may have different chemical compositions and mechanical properties.

In the case of ASTM A278 class 35C, the material is a carbon steel and low alloy steel casting with a minimum tensile strength of 35,000 psi, a minimum yield strength of 22,000 psi, and a minimum elongation of 22%. The specific chemical composition of the material includes carbon, manganese, silicon, phosphorus, sulfur, and potentially other trace elements.

Note:

It is important to note that ASTM A278 class 35C is a grade of carbon steel and low alloy steel castings, not gray iron. Gray iron is a different type of cast iron that is characterized by its gray color, which is due to the presence of graphite flakes in the microstructure.

ASTM A278 does include several grades of gray iron castings, including classes 30, 35, and 40. These grades of gray iron have different mechanical properties and are used in a variety of applications, such as engine blocks, gears, and machine tool bases.

Compared to gray iron, steel castings such as ASTM A278 class 35C typically have higher strength and toughness, as well as better resistance to wear and corrosion. The specific choice of material will depend on the specific requirements of the application, including the operating conditions, the design of the component, and the required properties of the material.

Equivalent grades

There are several equivalent grades to ASTM A278 class 35C, which may vary depending on the country or region. Some of the equivalent grades are:

• BS3100 grade A4
• DIN 1681 grade GS45
• EN 10293 grade G35

Chemical composition

The chemical composition of ASTM A278 class 35C castings typically includes:

• Carbon (C): 0.25% max
• Manganese (Mn): 0.70-1.00%
• Silicon (Si): 0.15-0.50%
• Phosphorus (P): 0.035% max
• Sulfur (S): 0.040% max

Additionally, this grade of cast steel may also contain trace amounts of other elements, such as copper (Cu), nickel (Ni), and chromium (Cr), depending on the specific composition and intended application.

The properties of ASTM A278 class 35C castings are determined by a combination of its chemical composition, microstructure, and processing conditions. Generally, this grade of cast steel exhibits good strength, toughness, and wear resistance, as well as good machinability and weldability. However, the exact properties of the material can vary depending on the specific casting process and heat treatment used, as well as the quality of the casting itself.

Mechanical properties

The mechanical properties of ASTM A278 class 35C castings are specified in the ASTM A278 standard. The typical mechanical properties of this grade of cast steel are:

• Tensile strength: minimum 35,000 psi (240 MPa)
• Yield strength: minimum 22,000 psi (150 MPa)
• Elongation: minimum 22%
• Hardness: maximum 217 Brinell (HB)

It is important to note that the actual mechanical properties of the casting may vary depending on factors such as the casting process, section size, cooling rate, and heat treatment. The mechanical properties of the casting can be tested and verified through various methods such as tensile testing, impact testing, and hardness testing. The specific mechanical properties required for a particular application will depend on the operating conditions and the design requirements of the component.

Applications

ASTM A278 class 35C castings are commonly used in a variety of general-purpose applications that require good strength, toughness, and resistance to wear and corrosion. Some of the typical applications of this grade of cast steel include:

1. Valves: ASTM A278 class 35C castings are commonly used in the manufacturing of valve bodies, stems, and other components that require good mechanical properties and resistance to wear and corrosion.
2. Fittings: This grade of cast steel is also used in the manufacturing of fittings such as pipe elbows, tees, and reducers, which are used in various piping systems.
3. Flanges: ASTM A278 class 35C castings are often used in the manufacturing of flanges, which are used to connect piping systems and other equipment.
4. Pump, and compressor components: This grade of cast steel is also used in the manufacturing of casings, impellers, and other components that require good strength and resistance to wear and corrosion.
5. Mining equipment: ASTM A278 class 35C castings are commonly used in the manufacturing of various mining equipment such as dragline buckets, excavator buckets, and crusher liners.

Overall, ASTM A278 class 35C castings are widely used in various industrial applications that require good mechanical properties and resistance to wear and corrosion. The specific application of this grade of cast steel will depend on a variety of factors, including the operating conditions, the design of the component, and the required properties of the material.