What Are the Quality Inspection Standards for Hardware CNC Castings?
Sep 09, 2025
Products Description
High-speed CNC Machining Of Metal Parts
Hardware CNC castings are hardware casting products machined using computer numerical control (CNC) technology. Below are the quality inspection standards for hardware CNC castings:
Appearance Inspection
Surface Defects:
Porosity: Pores exceeding specified sizes and quantities are not allowed on the surface or inside the casting. The size, number, and distribution of pores must comply with relevant standards or technical requirements. Minor pores may be tolerated to some extent but must not affect the strength and sealing of the casting.
Sand Holes: Significant sand holes are not permitted. The diameter and depth of sand holes must be within specified tolerance ranges. Excessive or numerous sand holes can reduce the strength and appearance quality of the casting.
Inclusions: Inclusions are not allowed on the surface or inside the casting, as they can affect its mechanical properties and machinability.
Cracks: Both surface and internal cracks are strictly prohibited, as they significantly reduce the strength of the casting and pose serious safety risks. For minor suspected cracks, further inspection methods such as nondestructive testing can be used for confirmation.
Cold Shuts: Cold shut defects are not allowed, as they can compromise the integrity and strength of the casting.
Surface Roughness:
Based on the usage requirements and design standards of the casting, an appropriate surface roughness range should be determined. Surface roughness is typically measured using a roughness tester or compared with standard samples. It must meet the requirements specified in the drawings or relevant standards.
Color and Appearance:
If color requirements are specified for the casting, the color must be uniform and consistent with the standard color chart or sample. Additionally, the appearance of the casting should be clean, free from obvious stains, rust, scale, etc.
Dimensional Accuracy
Basic Dimensions:
The basic dimensions of the casting, such as length, width, height, and diameter, must comply with the design drawings. Tolerance ranges are typically determined based on the casting grade and usage requirements.
Geometric Tolerances:
Geometric tolerance indicators, including flatness, parallelism, perpendicularity, roundness, and cylindricity, must meet relevant standards or technical requirements. For example, flatness errors should be within the specified flatness tolerance range, and perpendicularity deviations should conform to design requirements.
Internal Quality Inspection
Chemical Composition:
The chemical composition of the casting must be tested using methods such as spectral analysis or chemical analysis to ensure it meets design requirements and relevant standards. For example, for steel castings, the content of elements such as carbon, silicon, manganese, sulfur, and phosphorus must be tested. For aluminum alloy castings, the content of elements such as aluminum, magnesium, and silicon must be tested.
Mechanical Properties:
Tensile Strength: Tensile testing should be performed using a tensile testing machine to determine the tensile strength of the casting. The tensile strength must meet the values specified in the design requirements and relevant standards.
Yield Strength: The yield strength of the casting should be determined through tensile testing, as it is one of the key indicators of mechanical performance.
Hardness: Hardness testing should be conducted using a hardness tester. The hardness value must meet design requirements. Different materials and usage requirements may have varying hardness specifications. For example, castings subject to wear require higher hardness, while those requiring toughness may have lower hardness requirements.
Impact Toughness: For castings that may experience impact loads during operation, impact toughness must be tested. Impact toughness reflects the casting's ability to absorb energy under impact loads and is typically tested using an impact testing machine.
Other Inspections
Machinability:
If the casting requires subsequent machining, such as cutting, drilling, or tapping, its machinability must be tested. For example, the surface quality after machining should be good, and defects such as chipping or burrs should be minimized.
Sealing Performance:
For castings requiring sealing, such as valves or pump bodies, sealing performance tests must be conducted. Methods such as air tightness tests or water tightness tests can be used to check for leaks.
Nondestructive Testing:
Common nondestructive testing methods include magnetic particle testing, ultrasonic testing, and radiographic testing. These methods can detect internal defects such as cracks, pores, and inclusions, ensuring the internal quality of the casting.
Titanium product forms available from GNEE
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Material
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Pure titanium and Titanium alloy
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Titanium Grade
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Grade 1-Unalloyed titanium
Grade 2-Unalloyed titanium
Grade 3-Unalloyed titanium
Grade 7-Unalloyed titanium plus 0.12 to 0.25 %palladium
Grade 9-Titanium alloy (3 % aluminum, 2.5 % vanadium)
Grade 12-Titanium alloy (0.3 % molybdenum, 0.8 % nickel),
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Standard
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ASTM B338/ASME SB338, ASTM B337/ASME SB337, ASTM B861/ASME SB861, ASTM B862/ASME SB862,AMS4911,AMS4928
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Shape
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Round Square Rectangle
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Type
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Seamless/Welded
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Seamless titanium tube: Titanium sponge-Compacting electrodes-melting-Forge-Bar billets-Extruding-Rolled-Straightening-Seamless tube
Welded titanium tube: Titanium sponge-Compacting electrodes-melting-Forge-Plate billets-Hot rolled-Cold rolled-Titanium scrap-Welded-Welded tube |
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Surface
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Polishing, picking, acid washed, black oxide
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Application
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1) General service industries (petroleum, food, chemical, paper, fertilizer, fabric, aviation and nuclear
2) Fluid, gas and oil transport
3) Pressure and heat transmission
4) Construction and ornament
5) Boiler heat exchangers
6) Motorbycle and bike
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Material Milling Certificate
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According to. EN 10204.3.1
Including Chemical composition and Mechanical property |
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Grade |
Gr1, Gr2, Gr3,Gr4,Gr5, Gr7, Gr6,Gr9, Gr11, Gr12 ,Gr16, Gr17,Gr25 |
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Size |
All sizes can be customized |
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Application |
Metallurgy, electronics, machinery, medical treatment, chemical industry, petroleum, medical treatment, aerospace |
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Feature |
High corrosion resistance, low density, good thermal stability |
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Technology |
Hot Forged, Hot Rolled, Cold Rolled, Annealing, Pickling |
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Surface |
Bright, Polished, Pickling, Acid cleaning, Sandblasting |
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Packing |
Export Standard Woodcase |
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Delivery time |
10-25days according to the quantity and process of the product |
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Quality and test |
Hardness test, Bending test, Hydrostatic etc. |
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Grade |
GR1,GR2,GR3,GR5,GR6,GR7,GR9,GR11,GR12, etc. |
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Standard |
ASTM B265,ASTM F136,ASTM F67,AMS4928 |
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Size |
0.5-5.0mm x 1000mm x 2000-3500mm (Thickness x Width x Length) |
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Application |
Metallurgy, electronics, machinery, medical treatment, chemical industry, petroleum, medical treatment, aerospace |
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Supply status |
M (Y/ R/ ST) |
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Feature |
High corrosion resistance, low density, good thermal stability |
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Technics |
Hot Forged, Hot Rolled, Cold Rolled, Annealing, Pickling |
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Surface |
Bright, Polished, Pickling, Acid cleaning, Sandblasting |
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Packing |
Export Standard Woodcase |
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Payment terms |
T/T, L/C, D/A, D/P, Escrow, Western Union, PayPal |
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Certificate |
ISO 9001:2008; The third test report; TÜV Rheinland; |
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Delivery time |
7-15days according to the quantity and process of the product |
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Quality and test |
Hardness test, Bending test, Hydrostatic etc. |
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Material |
Pure titanium and Titanium alloy |
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Titanium Grade |
GR1/GR2/GR3/Gr4/GR5/GR7/GR9/GR12/Gr5Eli/Gr23
ERTi-1/ERTi-2/ERTi-3/ERTi-4/ERTi-5Eli/ERTi-7/ERTi-9/ERTi-11/ERTi-12 Ti15333/Nitinol Alloy |
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Standard |
AWS A5.16/ASTM B863/ASME SB863, ASTMF67, ASTM F136, ISO-5832-2(3) etc |
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Shape |
Titanium Coil Wire/Titanium Spool Wire/Titanium Straight Wire |
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Wire Gauge |
Dia(0.06--6) *L |
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Process |
Bar billets-hot rolling-drawing-annealing-strength-pickling |
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Surface |
Polishing, picking, acid washed, black oxide |
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Main Technique |
Hot Forged; Hot Rolled; Cold drawn; Straighten etc |
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Material Milling Certificate |
According to. EN 10204.3.1 |
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Application |
Welding, Industry, Medical, Aerospace, Electronic etc |
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Material Available |
Aluminum, Stainless Steel, Carbon Steel, Brass, Bronze, Copper, Titanium and etc |
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Surface Treatment Available |
Anodized, Nickel Plated, Zinc Plated, Chrome Plated, Passivation, Electrophoresis, Electropolishing, Painting, Powder Coated, etc |
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Certificate &Standard |
ISO9001 certified factory with good quality control and all of our products are 100% inspected before delivery. |
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Equipments |
Over 28 CNC Milling Machines (3,4, 5 Axis) & 22 CNC Turning machines can support your large order demand. |
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Design |
OEM & ODM are welcome, and also we have a R&D team and can help your design and develop your products |
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Application |
Different kinds of cars, machinery, home appliance, electronic products, electric appliance, stationery, computers, power |
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MOQ |
No quantity limitation |
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Samples |
Welcome you to request samples to test and check the quality. |
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Delivery & Shipping |
We can deliver to over 50 countries all over the world, shipping by DHL, FedEx, UPS, etc around 3 to 5 days |
GNEE is a specialized manufacturer and exporter of high-quality titanium products, including pipes, sheets, bars, wires, and fabricated parts.
We utilize advanced CNC machining, rolling, and welding equipment to ensure precision manufacturing. All products undergo strict chemical, mechanical, and non-destructive testing to guarantee compliance with international standards.
Our export-safe packaging includes wooden crates and waterproof wrapping to ensure secure delivery. If you have any needs, please feel free to contact us immediately：info@gneemetal.com
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