ThePipingMart Blog Grades Ductile Iron Grade 100-70-03 – Composition, Properties, and Uses

Ductile Iron Grade 100-70-03 – Composition, Properties, and Uses

Grade 100-70-03

Whether you’re in the manufacturing industry or simply interested in learning more about different grades of steel, Grade 100-70-03 is a popular choice. This alloy steel is known for its high strength, durability, and excellent thermal conductivity, making it suitable for various applications. So, what exactly is Grade 100-70-03, and what are its physical and mechanical properties? Join us as we take a closer look.

Grade 100-70-03 Composition

ASTM A536 is a type of low-alloy steel with high carbon levels and other alloys. Its chemical composition typically consists of 0.98% carbon, 0.70% manganese, 0.40% silicon, 0.22% phosphorus, and 0.04% sulfur. This unique blend of metals and elements gives Grade 100-70-03 impressive strength, flexibility, and toughness.

Element Percentage
Carbon 3.50–3.90%
Silicon 2.25–3.00%
Manganese 0.15–0.35%
Sulfur 0.025% Max
Phosphorus 0.05% Max

Grade 100-70-03 Physical Properties

Regarding physical properties, ASTM A536 has a density of approximately 7.85 g/cm3 and a melting point of 1420-1460°C. It is also notable for its excellent thermal conductivity, which makes it an ideal choice for use in high-temperature applications such as furnaces.

Grade 100-70-03 Mechanical Properties

Regarding mechanical properties, ASTM A536 is known for its high tensile strength, reaching 1000 MPa. It also has a high yield strength of around 725 MPa and a good elongation rate of 16%. This combination of properties makes it popular for use in demanding applications such as construction equipment, mining machinery, and power generation systems.

Mechanical Properties
Tensile strength psi (min) 100,000
Yield strength psi (min) 70,000
Elongation (min) 3%

Grade 100-70-03 Uses

The uses of ASTM A536 are numerous, thanks to its combination of physical and mechanical properties. It is commonly used to manufacture gears, wheels, and other components that require high strength and durability. It is also used in the construction industry for building structural components in bridges, buildings, and other structures.

Grade 100-70-03 Hardness

The hardness of ASTM A536 is typically between 200-250HB, depending on the specific production process used. This hardness makes it suitable for various applications where wear and tear are a concern, such as mining and construction.

Grade 100-70-03 Heat treatment

Heat treatment is an important aspect of working with ASTM A536. It is typically heat-treated at a high temperature to optimise its mechanical properties, followed by a cooling period. This process helps to increase its overall strength and reduce the risk of cracking or other defects.


ASTM A536 is a high-strength, low-alloy steel with numerous practical applications across various industries. It’s unique composition and impressive physical and mechanical properties make it versatile for reliable and durable materials. Whether you’re building structures, constructing machinery, or working in any other field requiring high-strength components, Grade 100-70-03 is a material to consider.

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