What Are the Material Requirements for Embedded Parts in UHPC Component Installation? Connection Safety and Qinglong Group Material Standards

The material selection of embedded parts for UHPC component installation directly affects connection safety and durability, and must meet three core requirements: strength matching, corrosion resistance, and reliable anchoring. Based on 28 years of engineering practice, Qinglong Group stipulates that embedded parts should be made primarily of austenitic stainless steel (such as 304, 316), with 2205 duplex stainless steel for critical locations; carbon steel (prone to rusting) is strictly prohibited. In the seaside roof project of the Hainan International Convention and Exhibition Center, we used 316 stainless steel embedded parts (Cr≥16%, Ni≥10%) together with dedicated stainless steel anchor bolts; after 10 years of exposure to a high-salt-spray environment, there has been no rust-expansion damage anywhere. Embedded parts are the lifeline of the UHPC curtain wall system, and their material selection must be absolutely foolproof.

Stainless Steel Grade Must Match the Environment

For indoor dry environments, 304 stainless steel (0Cr18Ni9) can be used; for coastal areas with chloride ion content <500ppm, use 316 (0Cr17Ni12Mo2); for severely corrosive environments (such as chemical plants), 2205 duplex steel is recommended. Qinglong Group provides a material selection sheet for every project to prevent misuse.

Material Mechanical Properties Must Coordinate with UHPC

The tensile strength of embedded parts should be ≥500MPa, forming a gradient with the UHPC substrate (tensile strength 8-12MPa). We use a cold heading process to produce threaded rods with strength up to 700MPa, ensuring that anchorage failure occurs before component failure.

Surface Treatment and Insulation Measures to Prevent Electrochemical Corrosion

When embedded parts come into contact with carbon steel frames, nylon washers must be added for insulation. Qinglong Group's embedded parts undergo surface passivation treatment, forming a Cr2O3 protective film. In the Wuhan Hanxiu Theater project, all embedded parts were given insulation treatment to prevent galvanic corrosion.

Though small, embedded parts are vital to overall safety. Qinglong Group has established a full-process traceability system for embedded parts, with checks at every stage from material to installation.