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1. Introduction
Steel is one of the most important materials in the building industry today. The use of Steel in construction has become more common, not just in the industrial sector but in residential buildings as well. The versatility and strength of steel makes it an excellent choice for a variety of construction projects. In order to create a high-quality steel structure, it is important to understand the different types of steel available and their corresponding steel number grades. This article will provide an overview of the different types of commonly used structural steel in Korea and the corresponding steel code grades.
2. Steel Grades in Korea
In Korea, there are a range of different steel grades that are widely used for structural applications. The grades of steel used for structural purposes in Korea are generally SPHC and SS400. SPHC (Steel Plate Hot-Rolled Carbon) is a widely used steel grade that is commonly used for structural applications in Korea. It is an economical grade of steel with moderate strength and good formability properties. The SS400 grade of steel is also commonly used for structural purposes in Korea. It is a low-carbon steel grade with good weldability and formability properties. In addition, the SS400 steel grade is also good for cold rolled applications as it has good cold workability properties.
3. Technical Properties of the Two Grades
Both the SPHC and SS400 grades of steel have similar technical properties, which are outlined in Table 1 below.
Table 1: Technical Properties of SPHC and SS400 Steel
SPHC:
• Minimum Yield Strength: 245 MPa
• Minimum Tensile Strength: 375 MPa
• Elongation: 16%
• Impact Energy: 17–33 J
SS400:
• Minimum Yield Strength: 245 MPa
• Minimum Tensile Strength: 410 MPa
• Elongation: 21–32%
• Impact Energy: 28–34 J
4. Steel Code and Specifications
In Korea, structural steel is classified according to the type of steel, its grade and its strength. The Korean steel code is comprised of two letters followed by a three-digit number (e.g. SM400A). The first two letters indicate the type of steel. The third letter is the grade of the steel and the last three digits indicate the strength or weight of the steel based on the Japanese Industrial Standard (JIS). Table 2 below shows the different steel code and strength for each grade of steel.
Table 2: Steel Code and Strength
Grade Code Strength
SPHC SM490A 245MPa
SS400 SM400A 410MPa
5. Common Applications of Structural Steel
Structural steel is widely used in a variety of applications in Korea, ranging from large-scale industrial applications to residential and commercial buildings. In particular, structural steel is used in the construction of bridges, buildings, and other structures that require large amounts of structural support. Structural steel is also used in the fabrication of machinery and mechanical parts, and in the production of steel products.
6. Conclusion
Korean structural steel is widely used in a variety of applications. The two most common grades of steel used for structural purposes in Korea are SPHC and SS400. These grades of steel have similar technical properties and the corresponding steel codes and strengths are outlined in the article. Structural steel is used in the construction of bridges, buildings, and other structures, as well as for the fabrication of machinery and mechanical parts.
