CHEMICAL
Investment casting parts is formed by pouring melted metal into the sprue. This makes it possible to cast products in large kinds of metal alloys, and different materials have its own characteristics. Any composition error of elements might bring much trouble to our customers. So we need to test the chemical composition of materials accordingly. Material testing is performed by spectrographic instrument. Our quality control procedure in material is: When ordering raw material from material factory, material certificate is requested and provided. And before production, we will compare the composition of each element by spectrograph, and the recorded result will show if the material is within the range. And after casting or heat treatment,our testing instrument will help us to confirm if the material composition is changed during the production process. And each batch testing result will be recorded in our laboratory room for future trace.
KNOWLEDGE BASE
Sample Preparation
Precision Cutting
1.5″ & 2″ Mounts
Thermoset & Thermoplastic Mounting
Cold Mounting
Automatic and Hand Grinding & Polishing
Immersion, Swab & Electrolytic Etching
Micro Analysis
Macro-etch (ASTM E340)
Grain Flow
Weld Qualification
Surface Condition
Surface Finish
Microscopic Examinations
Microstructure
Carburization & Decarburization
Grain Size (ASTM E112)
Inclusion Rating (ASTM E45)
Plating/Coating Thickness
Carbide Precipitation
Ferrite by Point Count (ASTM E562)
Intergranular Attack & Oxidation
Alpha Case
Intergranular Corrosion (ASTM A262)
Sensitization
Surface Contamination
Nodularity, Nodule Count
Eutectic Melting
Case Depth
Micro Hardness
Case Depth
Profiles
Knoop & Vickers Testing
Carburization & Decarburization
Surface Contamination
Tensile Test
Ultimate Tensile Strength
Modulus of Elasticity
Yield Strength
Strain Test
Chemical Test
Spectro Maxx (Optical Emission Spectrometer, OES)
Follow ASTM, SAE and AMS alloy specifications
Adjustments to the alloy composition as needed by Charge Calculations
Impact Test
Measuring the energy absorbed when fracturing the sample
Toughness of the test material
Charpy Impact Test
- A test specimen is machined to a 10mm x 10mm (full size) cross-section, with either a “V” or “U” notch. Sub-size specimens are used where the material thickness is restricted. Specimens can be tested down to cryogenic temperatures.
NDT Testings
Radiography by usting X-rays or gamma rays penetrating through the castings
Magnetic Particle Testing in metals like cast iron and steel which can be magnetized
Penetrant Testing for detecting very small surface cracks
Additional Tests
Failure Analysis & Report Writing
Scanning Electron Microscopy (SEM/EDS)
Digital Imaging
McQuaid-Ehn Grain Size
Welder and Procedure Qualification (in accordance with MIL & API specifications, ASME & AWS codes, ASTM & EN standards and the Pressure Equipment Directive)