1.201 chemical composition of stainless steel
201 stainless steel is austenitic stainless steel, and its chemical composition is characterized by a lower nickel content and a higher manganese content. The following are the typical chemical composition ranges of 201 stainless steel (expressed as mass percentage) :
Carbon (C) : ≤0.15%**
The level of carbon content directly affects the hardness and corrosion resistance of stainless steel. 201 stainless steel has a relatively high carbon content, which makes it harder, but its corrosion resistance is slightly lower than 304 stainless steel.
Manganese (Mn) : 5.5%~7.5%**
The addition of manganese is mainly to replace part of the nickel, thereby reducing production costs, while improving the strength and toughness of the material.
Nickel (Ni) : 3.5%~5.5%**
Nickel is an important component of austenitic stainless steel, but the nickel content of 201 stainless steel is low, so its corrosion resistance is less than that of high nickel content stainless steel (such as 304).
Chromium (Cr) : 16%~18%**
Chromium is a key element that determines the corrosion resistance of stainless steel, and the moderate chromium content of 201 stainless steel can provide a certain corrosion resistance.
Silicon (Si) : ≤1.0%**
Silicon can improve the oxidation resistance of materials.
Phosphorus (P) : ≤0.06%**
The phosphorus content is controlled at a low level to avoid adverse effects on the toughness of the material.
Sulfur (S) : ≤0.03%**
The low sulfur content helps to improve the processing performance of the material.
Nitrogen (N) : ≤0.25%**
The addition of nitrogen can improve the strength of the material while maintaining good plasticity and toughness.
2.201 stainless steel physical properties
201 stainless steel has certain advantages in physical properties, especially in strength and wear resistance. The following are its main physical performance parameters:
Density: 7.93 g/cm³**
The density of 201 stainless steel is similar to other austenitic stainless steels (such as 304 and 316).
Melting point: 1400~1450°C**
Its melting point is relatively high and suitable for use in high-temperature environments, but it is necessary to note that its oxidation resistance is slightly lower than that of stainless steel with high nickel content.
Tensile strength: 520 MPa~750 MPa**
201 stainless steel has high strength and can withstand greater mechanical stress.
Yield strength: 275 MPa~450 MPa**
The high yield strength makes it more stable when carrying loads.
Elongation: 40%~60%**
The elongation reflects the plasticity of the material, and 201 stainless steel has good ductility and is suitable for various forming processes.
Hardness: HRB 100~HRB 120**
The high hardness makes it excellent in terms of wear resistance.
Thermal conductivity: 15 W/(m·K)**
The thermal conductivity is general, but it can fully meet the needs under normal conditions of use.
Linear expansion coefficient: 16~17 ×10⁻⁶/K (20°C~100°C) **
The linear expansion coefficient is moderate, and the dimensional stability is good when the temperature changes.
3. 201 stainless steel application field
Due to its excellent mechanical properties and low cost, 201 stainless steel is widely used in the following fields:
- Architectural decoration: such as door and window frame, guardrail, handrail, etc.
- Household appliances: such as washing machine inner tube, cooking utensils, tableware, etc.
- Industrial manufacturing: such as chemical containers, transportation equipment, etc.
- Automotive industry: such as exhaust pipes, decorative parts, etc.
4.Dry scrub process
Advantages:
1. Convenient operation: dry sanding process does not require the use of liquid media, equipment operation is relatively simple, suitable for rapid processing.
2. Good environmental protection: Because it does not involve the use of liquid coolant, it reduces the process of waste liquid treatment and reduces the pollution to the environment.
3. Uniform surface effect: Dry scrub can obtain uniform surface texture by controlling abrasive and pressure, and the visual effect is good.
4. High efficiency: dry grinding process processing speed is fast, suitable for mass production.
Cons:
1. Dust pollution: A large amount of dust will be generated during the processing process, which may affect the health of the operator, and it is necessary to be equipped with good dust removal equipment.
2. Temperature rise: Due to the lack of liquid cooling, the heat generated by friction is easy to cause the surface temperature of the stainless steel plate to rise, which may affect the material performance.
3. Limited scope of application: dry scrub may not be ideal for some high-precision or complex shape workpieces.
5.Wet scrub process
Advantages:
1. Good cooling effect: wet scrub uses liquid coolant, which can effectively reduce friction heat and protect the surface of stainless steel plate and equipment.
2. Reduce dust: The liquid medium can inhibit the flying of dust, improve the working environment, and reduce the harm to the health of the operator.
3. Higher surface quality: wet scrub can better remove small defects on the surface, making the finished product have a higher finish and consistency.
4. Strong applicability: For complex shapes or high-precision workpieces, the wet scrub process is better.
Cons:
1. High cost: wet scrub requires a liquid cooling system, and requires regular replacement of coolant and cleaning equipment, increasing maintenance costs.
2. Complex operation: compared with dry grinding, wet grinding equipment operation and maintenance requirements are higher, and the technical level of the operator has certain requirements.
3. Waste liquid treatment problem: The waste liquid generated by wet scrub needs to be properly treated, otherwise it may cause pollution to the environment.
