When it comes to stainless steel in industrial applications, AISI 304 and SS 304 are among the most widely used grades. These materials are commonly found in flanges, pipes, fittings, and industrial equipment. But many professionals in the Udhhyog sector often wonder: What is the difference between AISI 304 and SS 304?
Additionally, stainless steel blind flanges are essential components in piping systems, particularly in high-pressure and corrosive environments. Understanding SS 304 blind flange dimensions, standards, and pricing per kg is crucial for cost-effective industrial planning.
In this comprehensive guide, we will cover:
✔ AISI 304 vs SS 304 – What’s the Difference?
✔ SS 304 Blind Flange Dimensions & Standard Flanges
✔ Pricing of SS 304 per kg & Cost of Blind Flanges
✔ Applications of SS 304 in Udhhyog Industries
AISI 304 vs SS 304: What’s the Difference?
1. Understanding AISI 304 and SS 304
The American Iron and Steel Institute (AISI) assigns numbers to different stainless steel grades based on their chemical composition and mechanical properties. AISI 304 is a specific designation under the AISI standard, whereas SS 304 (Stainless Steel 304) is a general term used globally.
In essence:
- AISI 304 is the specific technical name given by AISI.
- SS 304 is a generic term referring to the same material used in various applications worldwide.
2. Chemical Composition
| Element | AISI 304 / SS 304 Composition (%) |
|---|---|
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 8.0 – 10.5 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 |
Both AISI 304 and SS 304 have the same chemical composition, meaning their corrosion resistance, strength, and mechanical properties are identical.
3. Mechanical Properties
| Property | AISI 304 / SS 304 |
|---|---|
| Tensile Strength | 515 MPa (75,000 psi) |
| Yield Strength | 205 MPa (30,000 psi) |
| Elongation | 40% |
| Hardness | ≤ 201 HB |
🔹 Conclusion: There is no difference in material quality between AISI 304 and SS 304. The terms are often used interchangeably in the industry, including in the Udhhyog sector.
SS 304 Blind Flange: Dimensions & Standards
1. What is a Blind Flange?
A blind flange is a solid flange without a bore, used to seal off pipelines, valves, or pumps in high-pressure applications. It is ideal for temporary or permanent system closures and is widely used in industries such as oil & gas, chemical processing, water treatment, and HVAC.
2. Standard Dimensions of SS 304 Blind Flanges
The table below shows the standard dimensions of SS 304 blind flanges based on ASME B16.5 standards:
| Pipe Size (NPS) | Outer Diameter (OD) mm | Bolt Circle Diameter (BCD) mm | Number of Bolts | Bolt Hole Diameter mm | Flange Thickness mm |
|---|---|---|---|---|---|
| ½" | 90 | 60 | 4 | 15 | 12 |
| 1" | 125 | 90 | 4 | 17 | 14 |
| 2" | 150 | 120 | 4 | 19 | 16 |
| 4" | 230 | 190 | 8 | 23 | 18 |
| 6" | 280 | 240 | 8 | 25 | 20 |
| 8" | 345 | 295 | 8 | 27 | 22 |
| 10" | 405 | 350 | 12 | 30 | 24 |
| 12" | 485 | 415 | 12 | 32 | 26 |
These flanges conform to ASME B16.5 and ASME B16.47 standards, making them compatible with industrial piping systems worldwide.
SS 304 Pricing: Rate per Kg & Blind Flange Cost
1. Rate of SS 304 per Kg
The cost of SS 304 stainless steel per kg depends on various factors such as:
✔ Raw material price fluctuations
✔ Market demand & supply conditions
✔ Thickness & grade variations
Current SS 304 Rate per Kg
| Product Type | Price Range (INR/kg) |
|---|---|
| SS 304 Raw Material | ₹200 – ₹250 |
| SS 304 Sheets & Plates | ₹220 – ₹280 |
| SS 304 Pipes | ₹240 – ₹300 |
| SS 304 Flanges | ₹250 – ₹350 |
(Note: Prices may vary based on supplier, location, and quantity.)
2. SS 304 Blind Flange Price
| Flange Size (NPS) | Estimated Price (INR per piece) |
|---|---|
| ½" – 2" | ₹500 – ₹1,500 |
| 3" – 6" | ₹1,500 – ₹3,500 |
| 8" – 12" | ₹3,500 – ₹7,500 |
| 14" – 20" | ₹7,500 – ₹15,000 |
| 24" and above | ₹15,000 – ₹25,000 |
🔹 Tip: Bulk orders often result in lower per-unit pricing, making it cost-effective for Udhhyog industries.
Why Choose SS 304 Blind Flanges in Udhhyog Industries?
Industries under the Udhhyog sector rely on SS 304 blind flanges for their superior:
✔ Corrosion Resistance – Perfect for chemical, water, and marine environments.
✔ High Strength – Ideal for high-pressure applications.
✔ Ease of Fabrication – Can be machined and welded effortlessly.
✔ Temperature Resistance – Withstands extreme heat and cold conditions.
Common Applications:
✅ Oil & Gas Pipelines – Sealing high-pressure sections.
✅ Water Treatment Plants – Preventing leaks in chemical pipelines.
✅ HVAC Systems – Closing air distribution pipes.
✅ Pharmaceutical & Food Processing – Ensuring hygienic, contamination-free transport.
Conclusion
While AISI 304 and SS 304 are technically the same material, they are commonly used interchangeably in the Udhhyog sector. SS 304 blind flanges are a cost-effective, durable, and corrosion-resistant choice for industrial piping systems.
Understanding the right dimensions, standards, and pricing helps industries make informed purchasing decisions, ensuring long-term operational efficiency.
For the best quality SS 304 blind flanges and industrial piping solutions, always choose trusted suppliers in Udhhyog industries.
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