ISO 4952-1981 Atmospheric corrosion resistant structural steel

I. Introduction

Corrosion of materials and structures is a serious issue that has caused tremendous financial losses in many industrial fields. In order to cope with this problem, corrosion-resistant structural steels are developed and have been widely used in different industries. ISO 4952-1981 corrosion-resistant structural steels is one of the specifications for corrosion-resistant structural steels for general applications. This standard specifies the requirements for corrosion-resistant structural steels for structural steel applications in normal atmospheric environment.

II. Basic Chemistry of Corrosion-resistant Steels

A kind of low alloy steel with a mixture of approximately 1.2%-13% chromium and up to 1.0% molybdenum is called corrosion-resistant steel. According to their characteristic, corrosion-resistant steels can be further divided into three types – ferritic, austenitic and duplex stainless steels. Ferritic stainless steels contain approximately 10%-17% chromium, with relatively little nickel and other elements. Austenitic steels contain at least 6% nickel as well as chromium and have better corrosion resistance then ferritic steels. Duplex stainless steels are a combination of ferritic and austenitic steels with improved corrosion resistance.

III. Properties of Corrosion-resistant Structural Steels

Corrosion-resistant structural steels are those steels specified in ISO 4952-1981. These steels must have good mechanical properties, and also corrosion resistance. The mechanical properties are determined by ISO 4952-1981 using tests such as Charpy, impact and tensile tests. The corrosion resistance is determined by making exposure of a test sample in a salt spray and evaluating the corrosion resistance by measures such as weight loss after the exposure period.

IV. Benefits of Corrosion-resistant Structural Steel

Corrosion-resistant structural steels are highly beneficial. They are designed to provide effective and reliable protection against the destructive power of atmospheric corrosion and moist environments. Therefore, it can be used as an effective protection solution in many industrial applications.

Moreover, these steels offer excellent weldability and formability, as well as excellent machinability. This makes them highly suitable for construction and manufacturing purposes, providing excellent results in exposed applications.

In addition to this, corrosion-resistant structural steels offer excellent low-temperature behaviour, which gives it an advantage over other materials in the same class. It can be used in temperatures as low as -60°C without fear of failure, providing a much longer service life than many other materials.

V. Applications of Corrosion-resistant Structural Steels

Corrosion-resistant structural steels have a widespread application in many industries due to their excellent corrosion resistance and mechanical properties.

The wide range of corrosion-resistant steels makes them suitable for numerous applications, including outdoor and indoor applications, for transportation, construction and agricultural purposes. Some of the common applications include motor vehicle exhaust systems, garage doors, window frames, roofs and shutters, electric vehicles and agricultural machinery.

VI. Conclusion

ISO 4952-1981 corrosion-resistant structural steels are steels designed to provide effective and reliable protection against atmospheric corrosion and moist environments. These steels offer excellent mechanical properties and corrosion resistance, as well as weldability, formability, machinability and excellent low-temperature performance. Corrosion-resistant structural steels are suitable for numerous applications, both outdoor and indoor, in transportation, construction and agricultural purposes.

介绍

ISO 4952-1981 is an international standard covering the requirements for atmospheric corrosion-resistant structural steels. It is applicable to materials which have a determined minimum yield strength of approximately 230 MPa and are designed for structural purposes.

This standard specifies the requirements for the properties of the raw material of the steels, including the chemical composition, mechanical properties, dimensional tolerances, surface condition and heat treatment. In addition, it requires non-destructive testing (NDT) for structures and components that involve welding, brazing, soldering or thermal cutting.

The steels covered by ISO 4952-1981 are suitable for use in many general structural applications, including bridges, cranes, bridges and storage tanks. They are also suitable for use in areas of high exposure like coastal areas and other areas where there is a high risk of environmental corrosion.

The steels specified in ISO 4952-1981 have good formability and weldability, making them an ideal material for many building purposes. They are also cost-effective and have a good balance between strength and ductility.

ISO 4952-1981 steels are produced with a specific chemical composition and a specific range of mechanical properties and associated metallurgical characteristics. It is important that manufacturers perform all tests and inspections specified in this standard before using the steels for their intended purpose.

The steels specified in ISO 4952-1981 are suitable for a number of general applications and are an attractive option for use in areas of high environmental corrosion. They are cost-effective, relatively easy to work with, and have good formability and weldability. The steels are provided with comprehensive test and inspection requirements to ensure they will perform in the intended use.