Mine I-beam [YB/(T) 24-1986]

Introduction

Mining pit steel is an important component in mining engineering construction and is widely used, mining pit steel is also called mining double-headed steel, mining scissors steel, mining combination steel, mining steel lattice, etc.. It conveniently connects or combines different parts or components of mining engineering into a whole, making the various components of mining engineering, tightly and reliably connected and jointed.

Characteristics and Advantages

Mining pit steel is made in accordance with YBT 24-1986 fire-resistant steel standard, which can be designed and manufactured according to the use of strength grade, sizes and shapes required for geological conditions of the mining project. It also has certain mechanical toughness after cold forming and can maintain in the minus 40 degree and higher temperature environment for a long time without deformation. Due to its reasonable structure, the stability of shape, large strength and small area, it has a relatively high strength-to-weight ratio, so it is popular and widely used in engineering.

Application

Mining pit steel is mainly used in large-scale and medium-sized coal mine roadway face support, roof support, rock beam anchor, anchor cable and other forms of support engineering. It can also be used in tunnel support, pipe support, and other large-scale engineering as well. In addition, it is also used in national defense engineering, birdcage buildings and bridges, underground engineering, chemical piping system supports, etc..

Materials Used

Mining pit steel is usually made of high quality steel which meets national standards requirements, has strong corrosion resistance and a solid texture. In order to prevent and reduce the damage to the environment and health, the technology of surface electro-galvanizing or hot-dip galvanizing is usually used, which can make the surface of the steel have the protective coating of zinc rust and the service life of the steel can be extended.

Installing and Maintenance

The installation of mining pit steel should refer to the manual requirements, and the general installation of it should meet the requirements of “standardization, serialization and safety”. Maintenance of mining pit steel should pay attention to see if there is any bend or deformation during use, and it should be repaired, replaced or supplemented in time when there is damages.

Conclusion

Mining pit steel is an important mining engineering construction material, which has been widely used, and it is popular for its good performance, reasonable structure and other advantages. During installation and use, users should pay attention to the installation of it and the general precautions for maintenance, in order to ensure its normal use and extend its service life.

Mining Use H-shaped Steel (YB/(T)24-1986)

This technical specification is applicable to general purpose and special purpose H-shaped steel for mining use. H-shaped steel is the main product in steel structure, and it has the advantages of reliability, economy and good stiffness.

The hot roll H-shaped steel includes small and medium-sized thin-walled H-shaped steel, medium and large thin-walled H-shaped steel, wide H-shaped steel, narrow H-shaped steel, steel grades Bδ, Cδ, Dδ and Eδ, and special thicknesses.

The chemical composition of the H-shaped steel should comply with the provisions of Table 1. The mechanical properties of hot roll H-shaped steel should comply with the provisions of Table 2. The mechanical properties of the special thickness H-shaped steel should comply with the provisions of Table 6.

The steel should have sufficient toughness and weldability. The upper limit of tensile strength should be equal to or greater than the specified total elongation at break, which should not be less than 7%. For the narrow H-shaped steel, when the tensile strength is less than or equal to 540MPa, the value of permanent deformation should not be greater than 10%.

The steel should have stable composition, good casting and rolling process, and good surface quality. The maximum depth of surface defect of cold-formed thin-walled H-shaped steel should be less than 0.13mm. The allowed depth of surface defects of wide H-shaped steel and other H-shaped steel should be ≤0.10mm.

The H-shaped steel should be made of refining or smelting or controlled-rolling or controlled-cooling. The acceptance standard of H-shaped steel should refer to the relevant technical agreement required by the purchasers. The performance of hot-formed H-shaped steel and cold-formed H-shaped steel should comply with the requirements of Table 4 and Table 5.