Chemical Analysis
ASTM/EN/JIS Standards Spectrometer Test Chemical Reagent Comparison
Objective
Verify C, Si, Mn, Cr, Ni and other elements meet standard requirements.
Note
Batch differences may affect strength or corrosion resistance.
Valve Material & Quality Verification
Release time:2025.09.02
Valve Material • Quality Verification
How to Verify the Quality of Valve Raw Materials
Ensuring raw materials meet the specifications is the first step to producing high-quality valves. This guide provides comprehensive methods—from chemical composition and mechanical properties to metallographic and visual inspections—to help engineers and quality inspectors quickly assess material compliance.
Key Verification Methods
Chemical Analysis: Use spectrometers or chemical reagents to verify elemental composition, ensuring compliance with ASTM/EN/JIS standards.
Mechanical Testing: Tensile tests, hardness, and impact testing to confirm strength, ductility, and toughness.
Metallographic Examination: Inspect microstructure to ensure fine grains, no inclusions, and absence of cracks.
Visual Inspection: Check surface for cracks, porosity, inclusions, and ensure dimensions and tolerances match design.
Special Tests: Corrosion resistance, magnetism, heat treatment status, and additional tests depending on material type.
Applicable Materials
Carbon Steel, Stainless Steel, Alloy Steel, Copper Alloys
Carbon Steel, Stainless Steel, Alloy Steel, Copper Alloys
Tools & Equipment
Spectrometer, Universal Testing Machine, Hardness Tester, Microscope
Spectrometer, Universal Testing Machine, Hardness Tester, Microscope
Mechanical Testing
Tensile Test Hardness Test Impact Test
Objective
Ensure strength, toughness, and ductility meet design requirements.
Tools
Universal Testing Machine, Hardness Tester, Charpy Impact Tester
Metallographic Examination
Microstructure Grain Size Inclusion Check
Objective
Check for internal defects, ensure uniform structure without cracks or inclusions.
Tools
Optical Microscope, Scanning Electron Microscope (SEM)
Visual Inspection
Dimension Measurement Surface Defects Tolerance Verification
Objective
Ensure smooth surface, no cracks, porosity, or inclusions, and dimensions meet design tolerances.
Tools
Vernier Caliper, Micrometer, Visual + Magnifying Glass
Summary: Valve raw material inspection includes chemical composition, mechanical properties, metallography, and visual checks. Each step is crucial to ensure final valve quality and long-term reliability.
