GB/T 45338-2025 in English

Analysis of the core content of the standard

GB/T 45338-2025 standard systematically specifies the application requirements of hot isostatic pressing (HIP) technology in material densification processing, focusing on solving the problems of repairing defects such as porosity and looseness caused by processes such as casting and additive manufacturing. For the first time, the standard clearly raises the temperature uniformity control accuracy to ±10℃, and limits the working pressure fluctuation range to ±5MPa.

Comparison of key technical indicators

Key points for equipment selection and implementation

Standard 5.1.2 requires that hot isostatic pressing equipment must meet the following requirements:

• Molybdenum/nickel-based alloys are recommended for heating elements, and the maximum operating temperature must exceed the process requirements by 20%
• Equipped with an independent temperature control circuit, the temperature uniformity complies with the GB/T 9452-2023 Class IV furnace standard
• The pressure system should have a fine adjustment capability of 0.1MPa/min

Quality Assurance System

Establish three-level quality control according to the requirements of Chapter 8:

1. Process monitoring: Keep temperature-pressure curve records for each furnace
2. Furnace samples: Mechanical properties test no less than 3 groups per batch
3. Carbon pollution prevention and control: Graphite heating equipment needs to increase carbon content detection items

Special tips for safety protection

Chapter 10 of the standard emphasizes:

• Argon storage room needs to be equipped with oxygen concentration alarm
• Operators must wear high temperature resistant gloves (＞800℃)
• Double pressure relief confirmation is required before equipment maintenance