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.
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.
The hardness of surrounding rock determines its load capacity, if capacity is strong and hardness is sufficient, the maintenance effect naturally becomes better. At the same time, anti-corrosion of rock bolt is very important. which need to be paid with close attension.
Using highs strength roud bar as raw material, usualy the material is 42crmo, we can get round bar of high strength and better mechanical property with proper heat treatment technology, which Longteng has been used to produce wind turbine foundation bolt for decades