GB/T 16475-2023 in English

Comparative analysis of standard framework

Basic state code: O, F, H, T, corresponding to annealed state, free processing state, work hardening state and heat treatment strengthening state respectively.

Sub-state code: Arabic numerals or letters are used to further describe product characteristics, such as H2X represents the product state after high temperature annealing and slow cooling, and HX8 represents the superhard state.

Standard technology evolution analysis

New content:

• T62A state: used for aluminum alloy products with stable industrial processes to quickly obtain sample performance values.
• Over-aging treatment: Applicable to products that need to further stabilize corrosion resistance and mechanical properties.
• Stress relief state: eliminate internal stress through tensile or compressive deformation to ensure product dimensional stability.

Implementation Suggestions

Production unit:

• Select the appropriate state code according to product requirements to ensure that the mechanical properties and corrosion resistance requirements are met.
• Establish a complete database of heat treatment process parameters and optimize the aging curve to improve product quality.
• Use the verification method specified in the standard (such as T62A specimens simulating natural aging) to ensure that the specimen and product performance are consistent.

User unit:

• Explicitly require suppliers to provide verification reports for the corresponding states during procurement and acceptance.
• Select the appropriate heat treatment state based on the specific application scenario to ensure that the product has stable performance in the actual environment.
• Establish a long-term monitoring mechanism to track changes in the corrosion resistance of over-aged products.