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The connection of high-strength precision-rolled threaded steel bar is to prevent mutual sliding of connecting parts by friction between contact surfaces.

Rock bolt used as roof bolt is a main method to provid safe working environment for miners, prevent ground falls and save human lives and properties from hazards.

CIEEMA ‘s research team focused on Anyang Longteng Heat treatment Co.,Ltd, and visited wind energy anchor production line, anchor plate production line, steel tie rod production line and related product display areas in turn.

The use of higher-tensile steels for rock bolts and anchor bolts, presents a risk for a greater incidence of corrosion, which is dangerous in underground environments.

Mine anchor – rock bolt is used as a tensile member deep into the stratum. One end is connected to engineering structure and other end is deep into stratum. The entire anchor section is divided into a free segment and an anchor segment.

Most of high-strength anchor bolts for wind power use 10.9 grades, and a few are 8.8 or 12.9 grades. High-strength anchor bolt quality for wind turbines is greatly affected by raw materials. 

B7 steel is a high-strength fastener suitable for high-temperature and high-pressure environments in American ASTM A193 / A193M “alloy steel and stainless anchor bolt materials at high temperatures” standard.

The drilling depth of self drilling rock bolt should not be less than the effective length of the anchor rod body, overlength of rod body should not be greater than 100mm.

Anchor Bolt for wind turbine cage foundation is used to attach wind turbine to steel rebar and concrete structure. Anchor cage bolt requires high strength as well as anti-corrosion characteristic.

Rock bolt rods are usually made of high-quality alloy steel. The most commonly used materials are medium-carbon alloy structural steels such as 40Cr , 35CrMo and 42CrMo with good hardenability.