Here are the detailed quality inspection standards for ALLOY 630 (17-4PH stainless steel), covering international, foreign, and domestic standards, as well as key inspection items and industry-specific requirements:

I. International and Foreign Standards

1. ASTM Standards (American Society for Testing and Materials)

ASTM A564/A564M

Scope: For precipitation-hardened stainless steel bars, forgings, etc.

Inspection Items:

Chemical Composition: Specifies content ranges for elements like Cr, Ni, Cu, Nb, and C (e.g., Cr 15.5%–17.5%, Ni 3.0%–5.0%, Cu 3.0%–5.0%, Nb 0.15%–0.45%).

Mechanical Properties: Tensile strength, yield strength, elongation, and hardness under different precipitation-hardened conditions (e.g., H900: tensile strength ≥1310MPa, hardness ≥HRC40).

Workability: Includes forging and heat treatment process requirements, as well as weldability tests (e.g., weld crack resistance).

ASTM A705/A705M

Scope: Precipitation-hardened stainless steel forgings for aerospace, chemical industry, etc.

Inspection Items: Besides chemical composition and mechanical properties, adds non-destructive testing (NDT) requirements like ultrasonic testing (UT) and magnetic particle testing (MT) to ensure no internal defects.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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