Mechanical Properties of JIS G3114-1988 Atmospheric Corrosion-Resistant Hot-Rolled Steel for Welded Structures

Mechanical Properties of Hot-Rolled Steel Resistant to Atmospheric Corrosion for Welded Structures according to Japanese Industrial Standard JIS G3114-1988

Introduction

Atmospheric corrosion is an increasingly serious problem both in an industrial context and also in an aesthetic context, due to the deterioration of steel structures exposed to the elements. As a result, there is a need for materials that can withstand the atmospheric corrosion without losing any of their mechanical properties.

This paper examines the mechanical properties of hot-rolled steel resistant to atmospheric corrosion according to the Japanese Industrial Standard JIS G3114-1988. This type of steel is commonly used for welding structures, and the properties of this steel are therefore of particular importance to engineers and other professionals from a number of industries.

Hot-Rolled Steel

Hot-rolled steel is produced by rolling steel at temperatures higher than its recrystallisation temperature in order to achieve certain mechanical properties, such as improved strength and ductility. The higher temperature of the rolling process also allows for greater workability, which makes it easier to shape and form the steel for a range of purposes. Hot-rolled steel is often used for welded structures, as the process imparts a greater level of ductility that is suited to welded joints.

Chemical Composition

The chemical composition of hot-rolled steel resistant to atmospheric corrosion is composition is stated in Table 1.

Table 1. Chemical Composition of Hot-Rolled Steel Resistant to Atmospheric Corrosion (JIS G3114-1988)

C Si Mn P S Ni Cr Mo 0.11-0.17 0.15-0.35 0.5-1.0 0.030max 0.025max 0.25max 0.30max 0.08-0.15

Mechanical Properties

The mechanical properties of hot-rolled steel resistant to atmospheric corrosion, as stated in the Japanese Industrial Standard JIS G3114-1988 are shown in Table 2.

Table 2. Mechanical Properties of Hot-Rolled Steel Resistant to Atmospheric Corrosion (JIS G3114-1988)

Tensile Strength (MPa) Yield Point (MPa) Elongation (%) 370-550 280 min 25 min

Conclusion

This paper examined the mechanical properties of hot-rolled steel resistant to atmospheric corrosion according to the Japanese Industrial Standard JIS G3114-1988. JIS G3114-1988 specifies a chemical composition for this type of steel, as well as mechanical properties such as tensile strength, yield point and elongation. Hot-rolled steel has many advantages as a welding material, and as such this type of steel is often used in structural welding applications.

Mechanical properties of hot-rolled steel resistant to atmospheric corrosion for welding structure according to JIS G3114-1988

The steel plate and strip under the standard of JIS G3114-1988 applied in the welding structure have excellent atmospheric corrosion resistance and strength, which are widely used in making large construction works such as steel bridge, which require durability and can be used in various environment. The mechanical properties of this kind of steel are together listed as below.

The tensile strength of steel is in the range of 300-500MPa and the elongation is higher than 21%. The yield stress is greater than or equal to 225MPa, the lateral compressive strength is within 300-500MPa, and the Charpy impact value after annealing is higher than 27J/cm2. The bend strength and the bearing capacity is determined as according to the actual application.

The steel under the standard of JIS G3114-1988 is suitable for all kinds of welding and has good welding performance. It is mainly used for welding low-alloy structural steel and welding complex structures, such as ship building and steel structures. In order to make sure the quality of welding, during the welding process, it is necessary to conduct complete welding and heat treatment.

To sum up, the mechanical properties of hot-rolled steel resistant to atmospheric corrosion for welding structure according to JIS G3114-1988 have been presented in this article. It has excellent corrosion resistance ability and welding performance, which is widely used in welding various structures and can be used in all kinds of environment. The quality of welding structure needs to be strictly controlled by complete welding process and heat treatment.