GB/T 42512-2023 in English

Key technical indicators and interpretation

1. Chemical composition requirements

The chemical composition of the pipe must comply with the requirements in the table. For example, the copper content of H68 copper alloy should be between 67.0 and 70.0%, and the impurity elements such as sulfur and phosphorus should be strictly controlled at ≤0.01%. This high purity requirement ensures the excellent conductivity and mechanical properties of the material.

2. Mechanical performance indicators

The pipe must meet the room temperature mechanical properties specified in Table 5, including tensile strength ≥290MPa and elongation after fracture ≥50%. These indicators ensure the stability and reliability of the material under complex working conditions.

3. Process performance requirements

The expansion test and flattening test require the pipe to achieve a 30% expansion rate and an inner wall spacing equal to the wall thickness, respectively. These process indicators ensure the machinability of the material during the manufacturing process and the quality of the finished product.

Implementation recommendations

1. Select the appropriate grade and state

Depending on the specific application scenario, H68 alloy in the soft annealing (O60) state is suitable for occasions requiring higher ductility.

2. Quality control recommendations

Chemical composition deviations should be strictly controlled during the production process, testing equipment should be calibrated regularly, and batch records should be kept to ensure product quality traceability.

3. Optimization of testing methods

It is recommended to use advanced analytical methods in GB/T 5121 and YS/T series standards, such as X-ray fluorescence spectroscopy (wavelength dispersion type) for harmful substance detection.