1.Detection of Dimensions and Geometric Precision

Tools: Coordinate Measuring Machine (CMM), caliper, micrometer, projector, profilometer, etc.

Detection Contents:

Measure key dimensions of the parts, such as length, diameter, hole diameter, wall thickness, etc.

Check geometric tolerances, such as straightness, flatness, roundness, perpendicularity, coaxiality, etc.

Verify the geometric precision of complex curved surfaces or irregularly shaped structures through 3D scanning or image measurement.

 

2.Detection of Surface Quality

Appearance Inspection:

Visually observe or with the aid of a magnifying glass or microscope to check whether there are defects on the surface, such as scratches, cracks, oxidation, rust, burrs, pits, etc.

Check whether the effects of surface treatments (such as polishing, electroplating, sandblasting, etc.) are uniform.

Detection of Surface Roughness:

Use a surface roughness tester (such as a stylus type or optical type) to measure the surface roughness values (Ra, Rz, etc.) to ensure they meet the technical requirements.

 

3.Detection of Material Properties

Hardness Test:

Use a Rockwell hardness tester (HRB, HRC), Vickers hardness tester or Brinell hardness tester to check whether the hardness of the stainless steel meets the standards.

Chemical Composition Analysis:

Use a spectrometer (such as an X-ray fluorescence spectrometer, direct reading spectrometer) or chemical analysis method to verify whether the composition of the stainless steel (such as the contents of chromium, nickel, molybdenum) meets the requirements of the grade.

Mechanical Property Test:

Detect the mechanical properties of the stainless steel, such as strength and toughness, through tensile tests, impact tests, etc.

 

4.Detection of Internal Defects

Non-Destructive Testing (NDT):

Ultrasonic Testing: Used to detect internal defects such as cracks, pores, inclusions, etc., and is suitable for thick-walled parts.

X-ray Testing: Detect internal structural defects (such as weld quality, casting defects) by imaging through the penetration of the parts.

Magnetic Particle Testing: For ferromagnetic stainless steel, detect cracks on the surface and near the surface.

Penetrant Testing: Used to detect surface open defects (such as cracks, porosity) of non-porous materials.

 

5.Functional Testing

Sealability Test:

For parts with sealing requirements (such as valves, pipe joints), conduct hydraulic or pneumatic pressure tests to check for leakage.

Corrosion Resistance Test:

Verify the corrosion resistance of the stainless steel in specific environments through salt spray tests, intergranular corrosion tests, etc.

Assembly Test:

Check whether the assembly and fitting of the parts with other components are smooth to ensure normal functionality.