Materials&Finishes
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Fasteners&Fixings Finishing Services
1.Electro-galvanized
The most commonly used coating for commercial fasteners is Electro-galvanized.It is a process that immersing fasteners and fixings in an electrolyte solution containing zinc ions to avoid corrosion.Find out more about anodised fixings here.
2.Phosphating
Phosphating treatment involves immersing metal in a phosphating solution composed of phosphoric acid, phosphate, and other components.An insoluble layer of phosphate will be generated on the surface. Typically, phosphating fasteners need be coated with oil if corrosion resistance is desired.
3.Oxidation (Blackening)
The blackening treatment of fasteners involves the oxidation of the metal surface to form a uniform and dense oxide film. However, blackening treatment has almost no rust resistance capability, so it needs to be coated with rust-proof oil. If oil runs out, the fasteners will be rust quickly.
4. Galvanised
Galvanizing means immersing fasteners in molten zinc at a high temperature around 600°C. The zinc layer formed by galvanizing is very thick, so it has strong corrosion resistance. But the appearance is not perfect and the thickness of the zinc layer is hard to control, leading to lower precision. This treatment is typically applied for rust prevention in big fasteners.
5.Dacromet
Dacromet is a new type of corrosion resistance coating composed of zinc powder, aluminum powder, chromic acid, and deionized water. It owns extremely strong corrosion and high heat resistance. However, Dacromet is not strong enough, second assembly will easily damage the coating.
6.Cadmium Plating
Cadmium Plating will make fasteners strong corrosion resistance. however, the cost is 15-20 times higher than Electro-galvanized. Generally, it is only used in special environments, such as marine and petroleum drilling applications.
7. Silver and Nickel Plating
Silver plating not only provides corrosion resistance but also serves as a lubricant for fasteners. Due to the unique properties of silver, silver-plated fasteners are generally used in high-temperature environments. Nickel plating, offering both corrosion resistance and electrical conductivity, is generally used in locations such as vehicle battery terminals.
Fasteners&Fixings Materials
1.Alloy Steel
Alloy steel is mainly composed of carbon and iron, together with alloying elements such as copper, manganese, aluminum, titanium, rare earth, and other materials. This type of steel has high strength, good corrosion resistance, resistance to high and low temperatures, wear resistance, and non-magnetic properties.
2. Carbon Steel
• Low Carbon Steel: Carbon content is less than or equal to 0.25%, steel grades include Q215, Q235, Q195, 10#, 15#, 20#.
• Medium Carbon Steel: Carbon content is greater than 0.25% and less than or equal to 0.6%, steel grades include 35#, 45#.
• High Carbon Steel: Carbon content is greater than 0.6%, rarely used.
3.Stainless Steel
Stainless steel contains alloying elements such as Cr, Ni, Ti, providing corrosion-resistant properties. It is divided into austenitic stainless steel, such as A2 (304 series stainless steel), A4 (316 series stainless steel), 301, and 302 series stainless steel. Austenitic-ferritic stainless steel includes 0Cr26Ni5Mo2, 1Cr18Ni11Si4AlTi. Ferritic stainless steel includes 00Cr12, 1Cr17, 0Cr3Al. Martensitic stainless steel includes 2Cr13, 3Cr13, 4Cr13.
4.Brass
Brass is a zinc-copper alloy, sometimes with the addition of lead, manganese, and other metals. The copper content affects the alloy’s specific properties. For example, commonly used H62 and H65 brass have copper contents of 62% and 65% respectively. Higher zinc increases hardness but reduces ductility. Compared with copper, Brass have widespread use in fasteners.
5.Copper
Copper, also known as red copper due to its reddish appearance, typically contains around 99.5% copper in industrial materials. Pure copper has excellent thermal conductivity, second only to silver, making it a preferred alternative for applications requiring high electrical conductivity. However, Copper fasteners have lower strength due to their soft texture.
6.Aluminum
The most generally used aluminum for fasteners are 7075 aluminum and 6061 aluminum.
7075 aluminum and 6061 aluminum are differ in composition. 7075 containing 6% zinc, while 6061 mainly consists of magnesium and silicon. 7075 aluminum has higher strength than 6061. Commonly used aluminum in fasteners include 5A02, 2B11, 2A90, 7A09, 5A12, 5A05, 5A43.
7.Titanium
Titanium has an exceptionally high strength-to-weight ratio, with a weight only 57% that of steel of the same volume. It surpasses the strength of heat-treated carbon steel. Titanium also have strong corrosion resistance, but due to its expensive price, it is generally used in crucial applications.
8.Super Duplex Stainless Steel
1.4529 super duplex stainless steel is generally called as super austenitic stainless steel. It shows strong corrosion resistance and high strength, composed of elements like nickel, chromium, tungsten, and molybdenum. Its American name is N08926 INCOLOY926 accordingly. It provide excellent acid and alkali resistance, corrosion resistance, good toughness, and weldability, making it suitable for using in bad environments such as chemical and marine settings.
“2205” and “2207” duplex stainless steels contain 22% Cr, 5% Ni, and 3% Mo, providing better corrosion resistance than 316 stainless steel. Their strength is more than double of austenitic stainless steel.
Monel 400 mainly consist of 30% Cu and 65% Ni with a small amount of Fe (1%-2%), is more corrosion-resistant in reducing media than pure nickel and more resistant to oxidizing media than pure copper.
9.Other Duplex Stainless Steel Materials
904L/310S/C276/C22/Inconel 600，601,625,690,718.
CNC Metal Parts Materials
1.Aluminum
Aluminum is a lightweight and high-strength material. Because the CNC process is entirely controlled by computers, the aluminum parts can be high precision manufactured.
2.Stainless Steel:
Stainless steel CNC features high hardness and corrosion resistance, making it the most popular material for CNC machining.
3.Brass:
Brass is easy to be machined, smooth, and has a clean surface, with excellent conductivity.
4.Titanium:
Titanium is known for its heat resistance and corrosion resistance, which becomes a popular applications for many industries ranged from manufacturing medical implants aircraft components, jewelry, etc.
5.Magnesium:
Magnesium is the lightest metal, even lighter than aluminum . magnesium features excellent machinability. Its strong strength makes it suitable to the industrial field.
6.Monel:
Monel 400 is most popular for CNC machining. It is easy to be machined, non-magnetic, corrosion-resistant. Monel typically is used in extremely bad environments due to its expensive price.
CNC Metal Parts Finishing Services
1.As machined:
The standard finish for our parts, the “as machined” finish, has a surface roughness of 3.2 μm (126 μin), which removes sharp edges and deburs parts cleanly.
2.Polishing:
Polishing is a machining surface treatment that reduces the surface roughness of metal parts to make the surface bright and smooth.
3.Anodizing:
Mainly used on aluminum parts, anodizing make the surface of metal parts harden and wear resistant.
4.Powder Coating:
Powder Coating: Unlike traditional painting, powder coating also known as electrostatic powder coating, means spraying plastic powder onto the surface of metal parts. After high-temperature treatment, the powder adheres to the surface. The coating thickness ranges from 50 to 300 micrometers.
5.Sand blasting:
Sandblasting means propelling sand particles onto the metal parts at a high speed, leaving small craters on the surface of metal part.
6.Brushing:
Brushing is a surface treatment process in which abrasive belts are used to draw traces on the surface of a material, usually for aesthetic purposes.
