Stainless Steel 321H Flanges: High-Quality Metal Solutions

At ASC LLP, we are proud to offer a comprehensive range of 321H stainless steel flanges designed to meet the highest standards of quality and durability. Stainless steel flanges are essential components in various industrial applications, providing a secure and leak-proof connection between pipes, valves, pumps, and other equipment. Among the various grades available, stainless steel 321H flanges stand out due to their superior performance in high-temperature environments.

What is 321H Stainless Steel Flanges?

321H stainless steel flanges are made from a high-alloy austenitic stainless steel that contains titanium and a higher carbon content compared to the standard 321 grade. The addition of titanium stabilizes the material, preventing carbide precipitation during welding and improving its resistance to intergranular corrosion. The elevated carbon content in 321H provides enhanced creep resistance and strength at high temperatures, making it an ideal choice for flanges used in demanding environments.

Stainless Steel 321H Flanges

321H Stainless Steel Flanges Properties

The properties of 321H stainless steel flanges make them an excellent choice for various demanding applications. Below are the key properties that define the performance of these flanges:

  1. High-Temperature Strength: One of the most significant properties of 321H stainless steel flanges is their ability to maintain strength at high temperatures. The increased carbon content allows the material to perform well under continuous high heat, making it suitable for use in heat exchangers, boiler tubes, and high-temperature chemical processing equipment.
  2. Corrosion Resistance: 321H stainless steel flanges offer excellent resistance to oxidation and corrosion, even in harsh environments. The addition of titanium enhances this resistance, preventing carbide precipitation and reducing the risk of intergranular corrosion, which can occur in other stainless steel grades when exposed to high temperatures.
  3. Creep and Stress Rupture Resistance: The higher carbon content in 321H stainless steel flanges also provides better creep and stress rupture properties compared to 321 stainless steel. This means the material can withstand prolonged exposure to high stresses at elevated temperatures without significant deformation or failure.
  4. Good Weldability: Despite the higher carbon content, 321H stainless steel flanges are still relatively easy to weld, with no post-weld annealing required when used in most applications. This makes them convenient for use in fabricating complex systems that require extensive welding.
  5. Thermal Stability: 321H stainless steel flanges exhibit excellent thermal stability, retaining their mechanical properties even after prolonged exposure to high temperatures. This stability ensures the longevity and reliability of the flanges in high-temperature environments.

321H Stainless Steel Flanges Advantages

Choosing 321H stainless steel flanges comes with several advantages that make them a preferred option in various industrial applications:

  1. Superior Performance in High-Temperature Environments: The primary advantage of 321H stainless steel flanges is their ability to perform exceptionally well in high-temperature conditions. This makes them ideal for use in industries such as oil and gas, chemical processing, and power generation, where equipment is often exposed to extreme heat.
  2. Enhanced Durability and Longevity: The combination of high-temperature strength, corrosion resistance, and thermal stability ensures that 321H stainless steel flanges have a long service life, even in the most challenging environments. This durability reduces the need for frequent replacements, resulting in lower maintenance costs and downtime.
  3. Versatility: 321H stainless steel flanges are versatile and can be used in various applications, from chemical processing to aerospace. Their ability to withstand both high temperatures and corrosive environments makes them suitable for a wide range of industries.
  4. Cost-Effective Solution: While the initial cost of 321H stainless steel flanges may be higher than other materials, their longevity and reduced maintenance needs make them a cost-effective solution in the long run. The reduced risk of failure in critical applications also adds to their value.
  5. Compliance with Industry Standards: 321H stainless steel flanges manufactured by ASC LLP comply with international standards, ensuring consistent quality and performance. This compliance is crucial for industries that operate under strict regulatory requirements.
321H Stainless Steel Flanges

Schedule and Size Chart

Nominal Pipe Size (NPS) Flange Outside Diameter (OD) (inches) Thickness (T) (inches) Bolt Circle Diameter (BC) (inches) Number of Bolts Bolt Hole Diameter (inches)
1/2″ 3.50 0.62 2.38 4 0.62
3/4″ 3.88 0.69 2.75 4 0.62
1″ 4.25 0.75 3.12 4 0.62
1 1/2″ 5.00 0.88 3.88 4 0.75
2″ 6.00 0.94 4.75 4 0.75
3″ 7.50 1.00 6.00 4 0.75
4″ 9.00 1.12 7.50 8 0.75
6″ 11.00 1.25 9.50 8 0.88
8″ 13.50 1.38 11.75 8 0.88
10″ 16.00 1.50 14.25 12 1.00

Mechanical Properties Chart

Property Value
Tensile Strength 515 MPa (75,000 psi)
Yield Strength (0.2% offset) 205 MPa (30,000 psi)
Elongation (in 2 inches) 40%
Hardness (Rockwell B) 95 max
Modulus of Elasticity 193 GPa (28 x 10⁶ psi)
Reduction of Area 55%
Creep Strength (at 1000°F) 9.5 ksi (65 MPa)
Impact Toughness (Charpy V-Notch) 80 J (59 ft·lbf)

Specifications Chart

Standard Specification
ASTM A182, A240, A403, A213
ASME SA182, SA240, SA403, SA213
DIN 1.4541
EN 10222-5
UNS S32109
NACE MR0175/ISO15156
Pressure Class Ratings 150, 300, 600, 900, 1500, 2500
Flange Types Slip-On, Weld Neck, Blind, Socket Weld, Threaded, Lap Joint
Dimensions ANSI B16.5, B16.47, MSS-SP44

Chemical Composition Chart

Element Composition (%)
Carbon (C) 0.04 – 0.10
Chromium (Cr) 17.0 – 19.0
Nickel (Ni) 9.0 – 12.0
Manganese (Mn) 2.0 max
Silicon (Si) 0.75 max
Phosphorus (P) 0.045 max
Sulfur (S) 0.030 max
Titanium (Ti) 5x(C + N) – 0.70 max
Iron (Fe) Balance

Physical Properties Chart

Property Value
Density 8.0 g/cm³ (0.289 lb/in³)
Melting Point 1400°C – 1450°C (2552°F – 2642°F)
Thermal Conductivity 16.3 W/m·K (112.8 Btu·in/hr·ft²·°F)
Coefficient of Thermal Expansion 16.6 µm/m·°C (9.2 µin/in·°F)
Specific Heat Capacity 500 J/kg·K (0.12 Btu/lb·°F)
Electrical Resistivity 0.74 µΩ·m (29.1 µΩ·in)
Modulus of Elasticity 193 GPa (28 x 10⁶ psi)

Application Chart

Industry Application
Petrochemical Industry Piping systems for oil and gas transportation, reactors, and heat exchangers.
Chemical Processing Flanges in chemical reactors, distillation columns, and corrosive fluid pipelines.
Power Generation Boiler components, steam lines, and turbine flanges.
Aerospace Exhaust systems, engine parts, and heat shields.
Food and Beverage Processing equipment, piping systems, and storage tanks.
Pharmaceuticals Flanges in high-purity piping systems and processing equipment.
Heat Treatment Components exposed to high temperatures, such as furnace parts.
Automotive Exhaust manifolds and catalytic converters.

Why Choose ASC LLP as your exporter for 321H Stainless Steel Flanges?

At ASC LLP, we are committed to providing our clients with high-quality 321H SS flanges that meet the highest industry standards. Our products are manufactured using advanced technology and stringent quality control measures, ensuring that each flange delivers superior performance and reliability.

  1. Expertise and Experience: With decades of experience in the steel industry, we have the expertise to understand the specific needs of our clients and provide tailored solutions. Our team of professionals is dedicated to offering technical support and guidance to ensure that you choose the right flanges for your application.
  2. Global Supply Chain: We have established a robust global supply chain that allows us to deliver SS 321H flanges to clients worldwide. Whether you need a single flange or a bulk order, we can meet your requirements with timely delivery and competitive pricing.
  3. Quality Assurance: Quality is at the core of everything we do. All our 321H SS flanges undergo rigorous testing and inspection to ensure they meet the highest standards of quality and performance. We are ISO certified, and our products comply with international standards, including ASTM, ASME, and DIN.

ASC LLP is proud to offer 321H SS flanges as part of our extensive product range. These flanges are designed to meet the demands of industries that require high-temperature resistance, durability, and reliability. Whether you are in chemical processing, oil and gas, power generation, or any other industry that operates under extreme conditions, SS 321H flanges are the ideal choice for your applications.

Global Reach

Amardeep Steel Centre boasts a robust global presence, committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality AA 6061 T6 Aluminium Plates. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.

Metal globe

Countries We Export To

UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.

Follow us on: