What is 202 stainless steel?

202 stainless steel is a general-purpose stainless steel material that belongs to one of the 200 series stainless steels of the AISI (American Institute of Ferroalloys) standard. Its international standard code is S20200.

202 stainless steel is composed of alloying elements such as chromium, nickel and a small amount of carbon. Compared with other stainless steels, 202 stainless steel has a lower nickel content and a relatively higher magnesium content.

202 stainless steel has good corrosion resistance, medium strength and hardness, excellent processing performance and certain low temperature toughness. It is widely used in architectural decoration, kitchen utensils, medical equipment, auto parts and other fields.

What is the chemical composition of 202 stainless steel?

202 stainless steel is a common stainless steel material, its chemical composition is as follows:

Chromium (Cr): 17.0-19.0%

Nickel (Ni): 4.0-6.0%

Manganese (Mn): 7.5-10.0%

Silicon (Si): ≤1.0%

Phosphorus (P): ≤0.045%

硫黄 (S): ≤0.030%

In addition, 202 stainless steel may also contain small amounts of iron, carbon, nitrogen and other elements. The proportions of these chemical components can vary slightly depending on the manufacturer and specific requirements.

What are the mechanical properties of 202 stainless steel?

Stainless steel is a material with good corrosion resistance, including 202 stainless steel. 202 stainless steel has the following mechanical properties:

Tensile Strength: Usually about 520 to 720 megapascals (MPa), depending on specific production and handling conditions.

Yield Strength (Yield Strength): Usually about 275 to 415 MPa (MPa), also depends on the specific production and processing conditions.

Elongation: Typically about 30% to 45%, this is a measure of how much a material can stretch under force.

Hardness: Usually about 70 to 90 Rockwell hardness (HRC). Higher hardness means the material is more resistant to scratching and deformation.

Physical properties of 202 stainless steel

202 stainless steel is a stainless steel material with good corrosion resistance. The following are some physical properties of 202 stainless steel:

Density: The density of 202 stainless steel is about 7.8 grams per cubic centimeter, which is similar to other stainless steel materials.

Melting Point: The melting point of 202 stainless steel is about 1400 to 1450 degrees Celsius.

Thermal Conductivity: The thermal conductivity of 202 stainless steel is about 16 to 19 watts/meter Kelvin, which is in the lower range of stainless steel.

Coefficient of Linear Expansion: The linear expansion coefficient of 202 stainless steel is about 16 to 17 μm/m Kelvin.

Electrical Resistivity: The resistivity of 202 stainless steel is about 70 to 80 micro-ohm m.

Is 202 stainless steel magnetic?

202 stainless steel belongs to austenitic stainless steel and generally has certain magnetic properties. However, 202 stainless steel is less magnetic than other austenitic stainless steels.

Normally, 202 stainless steel is magnetic at room temperature, but its magnetism can change with changes in cold working or heat treatment. If cold-worked or heat-treated, the lattice structure in 202 stainless steel may change, resulting in a weakening of the magnetism. Under certain conditions, such as annealing at high temperature, non-magnetic 202 stainless steel can also be obtained.

It should be noted that magnetism is not the only basis for judging the quality and corrosion resistance of stainless steel. Other factors, such as alloy composition, manufacturing process, and material handling, are equally important to stainless steel’s performance and corrosion resistance. Therefore, when selecting and applying 202 stainless steel, it is best to refer to the technical specifications and test data provided by the supplier to ensure that it meets actual needs.

What are the performance characteristics of 202 stainless steel?

202 stainless steel has the following performance characteristics:

Good corrosion resistance: 202 stainless steel shows good corrosion resistance in general atmospheric environment, fresh water and many chemical media. It has high corrosion resistance to common organic acids, inorganic acids and salt solutions.

Moderate Strength and Hardness: 202 stainless steel has moderate tensile strength and hardness, making it strong enough for some structural and mechanical applications.

Excellent processing performance: 202 stainless steel is easy to cut, weld, form and process. It can be changed in shape and processed by conventional cold working, heat treatment and plastic forming processes.

Low temperature toughness: 202 stainless steel still maintains a certain toughness at low temperature, which makes its application in low temperature environment more reliable.

Relatively economical: Compared with some high-end stainless steel materials, the price of 202 stainless steel is relatively low, so it is an economical and practical choice in some applications.

202 stainless steel heat treatment

202 stainless steel can change its structure and properties through heat treatment. The following are some common heat treatment methods for 202 stainless steel:

Solution Annealing: Solution Annealing is to heat 202 stainless steel to a high enough temperature to completely dissolve it, and then cool it rapidly to avoid the precipitation of new phases. This process helps remove residual stress in the material and improves its corrosion resistance and toughness.

Rare Earth Treatment (Rare Earth Treatment): Rare earth treatment is to immerse 202 stainless steel in a solution containing rare earth elements for treatment. This treatment can improve the wear resistance, oxidation resistance and corrosion resistance of the material.

Annealing: Annealing is to heat 202 stainless steel to an appropriate temperature and then cool it slowly. This treatment process is used to improve the machinability of the material and reduce residual stresses.

Nitriding treatment (Nitriding): Nitriding treatment is to heat 202 stainless steel in a nitrogen atmosphere, so that nitrogen atoms can penetrate into the surface of the material to form a nitrided layer. This process increases the hardness, wear and corrosion resistance of the material.

Corrosion resistance of 202 stainless steel

202 stainless steel has good corrosion resistance, especially in general atmospheric environment and fresh water. The following are some characteristics about the corrosion resistance of 202 stainless steel:

Atmospheric corrosion resistance: 202 stainless steel exhibits good corrosion resistance under most common atmospheric conditions. It resists corrosion of metals by moisture, oxygen and other pollutants in the atmosphere.

Freshwater corrosion resistance: 202 stainless steel is suitable for freshwater environments, such as tap water pipes, water treatment equipment, etc. It has less impact on general water quality, dissolved oxygen and salinity changes.

Limited acid resistance: 202 stainless steel has certain corrosion resistance to many organic acids (such as acetic acid, malic acid, etc.) and inorganic acids (such as sulfuric acid, hydrochloric acid, etc.). However, its corrosion resistance may be reduced in strong acids (such as concentrated sulfuric acid) or in acidic environments with high chloride content.

Good corrosion resistance under weak alkaline and neutral medium: 202 stainless steel shows good corrosion resistance under weak alkaline and neutral medium (such as ammonia water, carbonate solution, etc.).

What is the difference between 202 stainless steel and 201 stainless steel?

202 stainless steel and 201 stainless steel are two common stainless steel materials, and they have some differences in alloy composition and performance characteristics:

Alloy composition: 202 stainless steel contains about 17-19% chromium, 4-6% nickel and less than 0.25% carbon. Whereas 201 stainless steel contains about 16-18% chromium, 3.5-5.5% nickel and less than 0.15% carbon.

Corrosion resistance: Compared with 201 stainless steel, 202 stainless steel has better corrosion resistance, especially for general atmospheric environment and fresh water conditions.

Strength and hardness: Compared with 201 stainless steel, 202 stainless steel has higher tensile strength and hardness, which makes it more advantageous in some structural and mechanical applications.

Processing performance: 202 stainless steel is slightly inferior to 201 stainless steel in terms of processing performance, but still has good machinability.

The use of 202 stainless steel

202 stainless steel is widely used in many fields due to its good corrosion resistance and mechanical properties. The following are some common uses of 202 stainless steel:

Construction and decoration: 202 stainless steel is commonly used in indoor and outdoor decoration, such as railings, door handles, stair handrails, columns, etc. It is weather resistant and aesthetically pleasing, providing a durable appearance to buildings.

Kitchen and food processing: 202 stainless steel is widely used in kitchen equipment, cooking utensils, food storage containers, etc. Its corrosion resistance and hygienic properties make it ideal for the food processing industry.

Medical equipment: 202 stainless steel is widely used in the manufacture of medical equipment, such as surgical instruments, surgical instruments, dental instruments, etc. Its corrosion resistance and biocompatibility make it suitable for contact with the human body.

Automobile and transportation: 202 stainless steel is commonly used in automobile parts, motorcycle parts, ship components, etc. It has the corrosion resistance and strength to meet the requirements of various means of transportation.

Chemical industry: 202 stainless steel is used in chemical plants, oil and gas processing equipment and other fields. Its corrosion resistance allows it to withstand harmful chemicals and corrosive environments.

Environmental protection equipment: Due to the good corrosion resistance of 202 stainless steel, it is widely used in environmental protection equipment such as sewage treatment equipment and waste gas treatment equipment.

In addition to the above fields, 202 stainless steel is also used to make furniture, electronic parts, electrical accessories, etc. Its wide usage stems from its excellent performance and cost-effectiveness.