GB/T 43151-2023 in English

Interpretation of GB/T 43151—2023 Technical Standard

I. Background and Significance of the Standard

With the development of my country's steel structure industry, weathering steel has been widely used in outdoor buildings and bridges due to its excellent atmospheric corrosion resistance. GB/T 43151—2023 "High-strength bolted connection pairs made of weathering steel for steel structures" is a technical standard formulated for such key connectors, aiming to ensure their mechanical properties, durability and reliability.

II. Scope of application of the standard

This standard applies to:

• High-strength bolted connection pairs with thread specifications of M12~M36.
• Products with performance grades of NH8.8S/NH8H and NH10.9S/NH10H.
• Applicable to steel structures, especially structural parts made of weathering steel.

III. Materials and performance requirements

Fourth, functional characteristics of the connection pair

The average torque coefficient of the large hexagonal head bolt connection pair is 0.110~0.150, and the standard deviation should not exceed 0.010. The coefficient of variation of the tightening axial force of the torsion shear type bolt connection pair must be ≤0.10.

Five, surface treatment and quality inspection

The connection pair needs to be surface treated to ensure the torque coefficient or tightening axial force:

• Bolt:Mark the manufacturer's identification code and performance grade (such as NH××.S).
• Nuts: are marked with "NH×H", where the numbers represent the highest performance level that can be matched.
• Washers: The hardness range is 329HV30～436HV30 (35HRC～45HRC).

VI. Packaging and storage requirements

The packaging box should be moisture-proof, and the weight of each box should not exceed 40kg, with bolts, nuts and washers packed separately inside. During transportation, it is necessary to load and unload gently to prevent thread damage.

Comparison of standard frameworks and analysis of technological evolution

Implementation suggestions