Stainless steel grade 202 is among the popular engineering materials available in the market today. This is due to this ステンレス鋼 composition, properties, benefits and applications.
In this article, we will explore some fundamental aspects about 202 SS. Let’s dive right in.
What is 202 Stainless Steel?
202 is an austenitic stainless steel containing 16-18% chromium, 7.5-10% manganese, 4-6% nickel, and 0.15 percent maximum carbon. This steel has high corrosion resistance, therefore, it is easy to form or fabricate.
Furthermore, the low nickel content in this stainless steel makes grade 202 relatively affordable compared to other grades like the 348 SS.
Chemical Composition of Stainless Steel Grade 202
Like other stainless steel materials, the 202 is an alloy of different elements compounds. Of course, these they exist in different quantities that determine the overall performance of the stainless steel.
Overage, the following elements make grade 202 SS:
- Chromium (Cr): 16.00-18.00%
- Manganese (Mn): 7.50-10.00%
- Nickel (Ni): 4.00-6.00%
- Silicon (Si): 1.00% max
- Nitrogen (N): 0.25% max
- Carbon (C): 0.15% max
- Phosphorus (P): 0.060% max
- Sulfur (S): 0.030% max
- Iron (Fe): Balance
202 Stainless Steel Properties
Ideally, whenever you are choosing any stainless steel grade, it is important to consider both mechanical and physical properties. Although the characteristics of stainless steel metals are almost the same, there is always a variation depending on the chemical composition.
Mechanical Properties:
- Ultimate tensile strength ranges from 515 to 760 MPa (74,700 to 110,200 psi) and has higher tensile strength than the previous material for improved structures in specific use conditions
- Yield Strength (0.2% offset): Minimum of 275 MPa (39,900 psi), which can be regarded as a good value when experiencing loads
- Elongation: Minimum 40% in 50 mm where it has better formability for fabrication applications
- Hardness: Up to 241 BHN/96 Rb, used where high levels of wear resistance are desired
- Young’s Modulus: 193 GPa (28 x 10⁶ psi) and providing moderate elastic response
- They have a conspicuous work hardening function, most advantageous to structural parts
Physical Properties:
- Density: 7.8 g/cm³ (0.282 lb/in³), which is in the average level of other austenitic grades
- Melting Range: Subcritical: 900-1100°C (1652-2012°F), supercritical: 1250-1450°C (2270-2642°F), used in welding and heat treatment
- Thermal Conductivity: 16.2 W/m.K at a temperature of 100° C, suitable for use in heat exchange systems
- Electrical Resistivity: Electrical conductivity of 0.7 × 10^5 S/m at 20°C for use in electrical applications and thermal conductivity of 72 μΩ.m at 20°C
- Thermal Expansion Coefficient: 17.2 micrometers/m Kelvin or 9.6 micro inches per inch Kelvin from 0 to 100 degrees centigrade
- Non-magnetic in the annealed condition; however, it is useful in some particular applications
- Maximum Service Temperature: Continuous: 870 °C/1600 °F Intermittent: 925 °C / 1700 °F
Benefits of Austenitic SS Grade 202
Cost-Effectiveness:
- Both substitutions of manganese to nickel provide the desired austenitic characteristics of the material while reducing cost
- Big and bulky industrial construction requirements are cost-effective
Mechanical Performance:
- 202-grade steel is very durable; as a result of forming, it increases strength in working
- They have a high weight-to-strength ratio hence suitable for structures
- It impacts properties in low temperatures
Corrosion Resistance:
- They are known to perform fairly well when exposed to atmospheric conditions
- Don’t use it where environmental conditions are extremely high or low
- Improved resistance by using passivation treatments
Fabrication Advantages:
- When welding, employ the normal austenitic process
- It makes machining easier when you use the correct tools and conditions
- It has very good drawing and forming qualities
- It will go well with most surface finishing methods
Versatility:
- Have mechanical properties for nonmagnetic steel in the as-annealed state
- Its structural strength is constant even at high temperatures
- Use where glass or metal appears suitable in both functional and aesthetic terms
- Excellent heat and oxidation characteristics
Service Performance:
- Stabilized long-term behavior in moderate climates
- Sustain mechanical properties and withstand temperatures from both low to high extremes
- Exhibit moderate fatigue strengths for cyclic loading regimes
- These substrates are relatively easier to maintain, especially when in the proper service conditions
Stainless Steel 202 Equivalent Grades
The equivalent grades differ country-wise and standard-wise
| Standard | Equivalent grade |
| UNS (Unified Numbering System) | S period 20200
|
| American Iron and Steel Institute (AISI) | 202
|
| ASTM (American Society for Testing and Materials) | A240 202
|
| JIS (Japanese Industrial Standards) | SUS 202
|
| IS (Indian Standards) | IS 1554– 60 Grade 1
|
Forms SS 202 Exists
After fabrication process, the SS 202 may exist in many forms. It is from these forms that you can use this stainless steel material for a wide range of applications. Some of the most common forms include;
· Sheets and Plates
Characteristics: It has flat roll products in the form of sheets and plates of various thicknesses from the SS 202 grade. Some of the most common applications include:
- In architectural claddings and railings design
- A counter for placing equipment on
Of course, there are available in different finishes including 2B, matte, mirror, brushed, or patterned.
· Coils
SS 202 is available as coils that run in continuous lengths for forming and fabrication purposes. In most cases, these coils are used to make tubes, pipes and other 202 stainless steel products.
Usually, we specify 202 stainless steel coils based on thickness and width. Remember, the thickness makes these stainless steel grades suitable for specific applications.
· Pipes and Tubes
SS 202 is available as pipes and tubes, and the product is in both seamless and welded forms as well. You can use these tubes or pipes as conduits for water, gas, chemical or oil. Additionally, you can use these tubes as structural support.
· Bars and Rods
SS 202 bars and rods come in a wide range of diameters, and these are round, square, hexagonal, and flat bars. They are commonly used as reinforcement bars. Besides, they form an integral component of various structures.
As you may have realized, while discussing the forms stainless steel grade 202, exists, we did mention some uses or applications.
The truth is, there are many uses of stainless steel 202 apart from those mention above. Other applications include:
- Utensils
- Hose clamps
- Window frames
- Door frames
- Sinks, etc.
よくある質問
1. How do you Distinguish 202 and 304 Stainless Steel?
202 and 304 stainless steels differ in both chemical makeup, corrosion resistance, and price structure.
For areas where the materials are indoors and costs are a major factor, select 202; for outdoor applications where durability and strength are key, select 304.
2. Is 202 Stainless Steel Food Grade?
Yes, but not the most preferred.
3. What is the average 202 Stainless Steel Price per Ton?
The average range as of December 2024 is from $1200 to $1500 per ton.
The increase or decrease of global prices depends on the energy costs for production, the cost of raw materials such as nickel, and world demand.
4. What is the difference between 201 and 202 Stainless Steel?
202 surpasses 201 in corrosion resistance due to its high nickel content and is thus expensive.
Both are non-magnetic and find use in applications of low coercively, including kitchen utensils, automobile parts, trims, and buildings.
5. Will 202 Stainless Steel Rust?
Due to the chromium oxide layer, 202 stainless steel is less prone to rust.
But when you expose the material to saltwater or acidic conditions and the outer barrier has a scratch or is not well lubricated, rust can occur.
結論
Clearly, the 202 stainless steel play an integral role in modern industrial applications. As a general role, always choose stainless steel grade depending on its unique characteristics.
For all your stainless steel fabrication in China, KDM is your trusted partner. For any inquiries, contact us now.
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