Low Carbon Steels: Use. The mechanical properties of structural steel are fundamental to its classification and application. As per the World Steel Association, steel is an alloy comprising predominantly iron and carbon (2%), manganese (1%) with traces of oxygen, sulphur, phosphorus and silicon.Steel possesses properties that include durability, versatility and strength making it an ideal material for use in building and construction activities. Low alloy structural steel. mechanical properties tables, they were split into two separate tables. Carbon structural steel. The properties of structural steel result from both its chemical composition and its method of manufacture, including processing during fabrication. This is the most commonly used commercial classification: i. To assist the user in keeping track of which comparison criteria were used for a given steel, each table within a chapter was sequentially numbered and appended with either the letter A or B. Metal Classification - Deciphering the Codes Introduction. a. ... and also because there are a wide range of heat treatments to choose from to reach a specified hardness or other properties. Such as steel for bridge, ship, boiler, pressure vessel, agricultural machinery, etc. Product standards define the limits for composition, quality and performance and these limits are used or presumed by structural designers. Commercial steels have carbon, normally, up to 1.5% maximum as the higher carbon content makes the steel extremely brittle. Their carbon content, microstructure and properties compare as follows: Mechanical Properties of Structural Steel - S235, S275, S355. Carbon steel can be classified into three categories according to its carbon content: low-carbon steel (or mild-carbon steel), medium-carbon steel and high-carbon steel [1]. Q195; Q215(A 、 B) Q235(A 、 B 、 C) Q255(A 、 B) Q275; b. c. General structural steel for a specific purpose. Though based on the carbon content, but classified according to the level of main mechanical properties of practical importance. last two numbers approximate amount of carbon (expresses in 0.01%) It is mainly used to manufacture Bridges, ships, vehicles, boilers, high pressure vessels, oil and gas pipelines, large steel structures, etc. Table numbers ending in the Next:The reason analysis of round steel surface crack and the solution measure.Properties and classification of alloy steels (also known as ordinary low alloy steel, HSLA) 1. AISI - SAE CLASSIFICATION SYSTEM AISI XXXX American Iron and Steel Institute (AISI) classifies alloys by chemistry 4 digit number 1st number is the major alloying element 2nd number designates the subgroup alloying element OR the relative percent of primary alloying element. Types of carbon steel and their properties. 17-4 Stainless Steel. II. Comprehensive classification (1) Ordinary steel.

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