Learn About ASTM A105 Carbon Steel Material Specification

Learn about ASTM A105 Forge Carbon Steel Material Specification

Do you need to know the ins and outs of ASTM A105 Carbon Steel material specification? Whether you’re a professional engineer or just looking for some DIY tips, this article is sure to give you all the information you need. It covers everything from chemical composition, mechanical properties, and physical characteristics of A105 steel so that whatever project you have in mind, it’s guided by strong technical specifications. Knowledge about ASTM A105 carbon steel can be essential when considering which materials are best suited for your particular application. So read on to learn more about this important topic!

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What is ASTM A105?

ASTM A105, also known as ASME SA105, is a specification for forged carbon steel piping components suitable for low and high temperatures. They cover a wide range of pipe fittings (Tee, elbow, coupling, etc.) and components such as flanges and valves.

All A105 components are forged, with a maximum weight limit of 4540 Kg (10,000 lb). A266 covers larger forgings weighing more than 4540 Kg. ASTM A105 material is widely used in the piping and pipeline industries and is suitable for a wide range of services from -29 degrees Celsius to +425 degrees Celsius. This carbon steel specification excludes pressure vessel shell tube sheets and hollow cylindrical forgings.

Properties of A105 Steel

Killed carbon steel is used to make A105 forged components. The Specific Gravity of A105 materials is 7.9 and the melting point is 2740 degrees Fahrenheit. They are extremely machinable and weldable.

Composition of A105 Steel

      • 0.35% carbon

      • 0.60-1.05% Manganese content

      • 0.35% phosphorus

      • 0.40% sulfur

      • 0.10-0.35% silicon

      • 0.40% copper

      • 0.40% nickel

      • 0.30% chromium

      • 0.12% molybdenum

      • 0.08% vanadium

    There are two additional criteria for ASTM A105 material that must be met. They are as follows:

        • The sum of copper, nickel, chromium, molybdenum, and vanadium must be 1.00%, and

        • The total amount of chromium and molybdenum must be 0.32%.

      Mechanical properties of A105 steel forgings:

          • Minimum Tensile Strength: 70,000 psi (485 MPa)

          • Minimum Yield Strength: 36,000 psi (250 MPa)

          • Minimum area reduction (0.2% offset method or 0.5% extension-under-load method): 30%

          • Maximum hardness: HBW 197. 

        The typical hardness range for ASTM A105 carbon steel forge material is 137 to 197 HBW.

        The maximum Carbon Equivalent [CE= C + (Mn/6) + (Cr+Mo+V)/5 + (Ni+Cu)/15] value for A105 steel material shall be 0.48.

        What is the difference between A105 and A105N?

        The letter N is frequently found attached to A105 steel material. As a result, the question of whether A105 and A105N are the same arises. If so, what are the distinctions between A105 and A105N materials?

        Both of the above use the same base material, A105, and have the same chemical composition. The letter N in ASTM A105N denotes a particular type of heat treatment. A105 has no specific heat treatment requirements, whereas A105N requires normalization heat treatment. Because of this heat treatment, A105 and A105N materials differ from one another. The following are the primary distinctions between A105N and A105:

        A105N has better mechanical properties than regular A105 steel due to the normalization treatment. The normalization heat treatment increases the strength of A105N. A105N also performs better in low-temperature service. As a result, A105N is advised for critical applications.

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