Why Choose Carbon Steel Fasteners?
As a common part, fasteners have a very wide range of applications, and there are many types and materials, among which carbon steel screws are the most common. Next, the professional fastener manufacturer Xinchi Fasteners Company will introduce the classification and advantages and disadvantages of carbon steel screws for you.
The classification of carbon steel screws
Ordinary carbon structural steel is used for general machine parts, and the commonly used grades are A1 ~ A7. The higher the number after code A, the higher the tensile strength of the steel and the lower the plasticity (the higher the hardness, the lower the flexibility).
High-quality carbon structural steel is used for machinery parts with higher requirements. Commonly used grades are steel 10# steel, 70#, and 15# steel. The number means: “carbon content”. For example, No.15 steel means that the average carbon content is 0.15%, and steel 40 is 0.40%. The higher the carbon content, the higher the strength and hardness, but the more brittle.
Alloy structural steel is widely used in various important machinery parts. Commonly used are 20Cr, 40Cr (for gear, shaft, rod), 18CrMnTi, 38CrMoAlA (important gear, nitriding parts) and 65Mn (spring steel). The number 20 on the front means that the average carbon content is 0.20%, and 38 means 0.38%. The A at the end represents high-quality steel. The chemical symbols of the middle alloy elements are Manganese Mn, Si silicon, Cr chromium, W tungsten, Mo molybdenum, Ti titanium, AL aluminum, Co cobalt, Ni nickel, Nb Nb, B boron, and V vanadium.
Carbon tool steel, because of its high carbon content, hardness and wear resistance, is commonly used in tools, molds, etc. Carbon tool steel is marked with a T in front of the grade to distinguish it from structural steel. The A after the grade stands for high-quality steel. Commonly used are T7, T7A, T8, T8A…… T13, T13A, etc.
The grade meaning of alloy tool steel is the same as that of alloy structural steel, except that the previous figure of carbon content is in units of 0. 10% (higher carbon content). For example, the average carbon content in 9CrSi is 0. 90%. Commonly used as molds are CrWMn, Cr12MoV (for cold stamping die), and 5CrMnMo (for hot pressing die).
The advantages of carbon steel screws
- Low price, easy to smelt
- Good processing technology
- Improve the performance (C%, heat treatment)
- Good elasticity and impact resistance
The disadvantages of carbon steel screws
- Poor hardenability
- Low strength level, low yield ratio
- Poor tempering stability and heat resistance
- Low-temperature resistance: carbon steel becomes brittle below the transition temperature of tough-brittle.
- Corrosion resistance: carbon steel can not resist the corrosion of atmosphere, acid, alkali, and salt.
- Magnetic conductivity: Carbon steel has low magnetic permeability.
- Non-magnetic: Carbon steel is inevitably magnetized in a magnetic field.
Xinchi Fasteners Company is a leading fastener company in China. We can supply different kinds of fasteners including tee nuts, screws, bolts, etc. Our fasteners can be made of carbon steel or stainless steel. Customization is also available. If you need wholesale fasteners, please contact us, and then our experienced salesmen will reply as soon as possible.