At Solitaire Fittings, we are a trusted Stainless Steel 321H Pipe Fittings Manufacturer, offering high-quality ASTM A403 WP 321H Stainless Steel Buttweld Fittings that meet global standards. With decades of experience in the steel industry, we supply precision-engineered fittings designed for durability, strength, and superior corrosion resistance.
Whether you need SS 321H Elbow, reducers, tees, caps, or customized solutions, our wide range of Buttweld Stainless Steel 321H Butt Weld Fittings ensures reliable performance in critical industries like petrochemical, power generation, pharmaceuticals, oil & gas, and more.
What are Stainless Steel 321H Buttweld Fittings?
Stainless Steel 321H Buttweld Fittings are pipe fittings made from a titanium-stabilized austenitic stainless steel grade. The “H” in 321H indicates a high-carbon version of Stainless Steel 321, which provides better high-temperature strength and creep resistance.
These fittings are manufactured using the buttweld process, where pipes are welded together end-to-end, ensuring a strong, seamless connection. This makes them ideal for industries that operate under extreme pressure and temperature.
The common types of SS 321H pipe fittings include:
- SS 321H Elbow – for changing pipe direction
- SS 321H Tee – for branching the flow
- SS 321H Reducer – for connecting pipes of different diameters
- SS 321H End Cap – for closing the pipeline
- SS 321H Stub End & Collar – for flanged joint systems
Key Features of ASTM A403 WP 321H Stainless Steel Buttweld Fittings
- High-Temperature Resistance – With higher carbon content, these fittings maintain strength and integrity at elevated temperatures.
- Excellent Corrosion Resistance – Titanium stabilization prevents carbide precipitation, reducing intergranular corrosion.
- Durability & Longevity – Designed to withstand high stress and harsh environments.
- Leak-Proof Joints – Buttwelded connections ensure tight seals for critical operations.
- Versatility – Widely used in chemical plants, oil refineries, food processing, and heat exchangers.
Types of Stainless Steel 321H Buttweld Fittings We Manufacture
- SS 321H Elbow (45°, 90°, 180°)
- SS 321H Long Radius & Short Radius Elbows
- SS 321H Reducers (Concentric & Eccentric)
- SS 321H Equal Tee / Unequal Tee
- SS 321H Cross Fittings
- SS 321H End Caps
- SS 321H Stub End & Collar
Applications of Stainless Steel 321H Buttweld Fittings
Our SS 321H pipe fittings are widely used in industries that require resistance to heat and oxidation. Some key applications include:
- Petrochemical & Oil Refineries – for pipelines exposed to high temperatures
- Power Plants – in boilers, superheaters, and heat exchangers
- Food & Pharmaceutical Industry – due to hygienic and anti-corrosive nature
- Aerospace & Marine – where durability and reliability are critical
- Chemical Processing Units – for handling corrosive chemicals and acids
Advantages of Buttweld Stainless Steel 321H Butt Weld Fittings
Specifications- Stronger Joints – Welded connections are more durable than threaded or socket weld fittings.
- Cost Efficiency – Requires fewer fittings, reducing installation cost.
- Better Flow – Smooth internal surface minimizes pressure drops.
- Customization – Easy to fabricate into different shapes and sizes.
- Reliability – Withstands high stress and thermal expansion.
ASTM A403 WP321H Standards & Grades
Our fittings comply with international standards such as:
- ASTM A403 WP 321H Stainless Steel Buttweld Fittings
- ASME SA403 WP321H Fittings
- ANSI B16.9 – for dimensions & tolerances
- DIN, JIS, EN, and MSS-SP specifications
We also supply equivalents such as:
- SS UNS S32109 Buttweld Fitting
- SS WP321 Pipe Elbow
- SUS 321 Pipe Fittings
Mechanical Properties of Stainless Steel 321H Buttweld Fittings
| Property | Value (Typical) | Standard Reference |
|---|---|---|
| Tensile Strength (Mpa) | 515 MPa | ASTM A403 / ASME SA403 |
| Yield Strength 0.2% Proof (MPa) | 205 MPa | ASTM A403 / ASME SA403 |
| Elongation (%) | 40% | ASTM A403 / ASME SA403 |
| Hardness (Brinell HB) | 217 max | ASTM A403 / ASME SA403 |
| Modulus of Elasticity (GPa) | 193 | - |
Chemical Composition – Stainless Steel 321H Buttweld Fittings
| Element | Composition % (Typical) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | ≤ 0.75 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5 × C up to 0.70 |
| Iron (Fe) | Balance |
Physical Properties – Stainless Steel 321H
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1398 – 1446 °C |
| Specific Heat Capacity | 500 J/kg·K (0–100 °C) |
| Thermal Conductivity | 16.3 W/m·K (at 100 °C) |
| Electrical Resistivity | 0.072 × 10⁻⁶ Ω·m (at 20 °C) |
| Modulus of Elasticity | 193 GPa |
| Magnetic Permeability | Non-magnetic (annealed) |
Specifications of Stainless Steel 321H Buttweld Fittings
| Standard / Specification | Details |
|---|---|
| Product Name | Stainless Steel 321H Buttweld Fittings |
| Material Grade | SS 321H (High Carbon version of SS 321) |
| Equivalent Grades | UNS S32109, WNR 1.4878, SUS 321H |
| Manufacturing Standard | ASTM A403 WP321H / ASME SA403 WP321H |
| Dimensions | ASME/ANSI B16.9, B16.28, MSS-SP-43 |
| Size Range | ½” NB to 48” NB (custom sizes available) |
| Schedules (Wall Thickness) | SCH 10, SCH 20, SCH 40, SCH 60, SCH 80, SCH 160, SCH XXS |
Why Choose Solitaire Fittings as Your Stainless Steel 321H Pipe Fittings Manufacturer?
At Solitaire Fittings, we are not just suppliers – we are trusted partners for industries across the globe. Here’s why:
- Quality Assurance – Each fitting undergoes strict testing, including PMI, IGC, hardness, and hydrostatic tests.
- Wide Product Range – From SS 321H Elbow to reducers, tees, and customized fittings.
- Global Standards Compliance – Manufactured under ASTM, ASME, ANSI, and DIN norms.
- Competitive Pricing – Cost-effective solutions without compromising on quality.
- Timely Delivery – A strong supply chain ensures on-time shipments worldwide.
Duplex Steel Pipe Fittings vs Stainless Steel 321H Buttweld Fittings
Some industries also use Duplex Steel Pipe Fittings for their excellent strength and corrosion resistance. However, Stainless Steel 321H Buttweld Fittings are preferred when high-temperature performance is a priority. Duplex grades are ideal for chloride environments, while 321H remains the best choice for thermal stability.
Request Your Stainless Steel 321H Buttweld Fittings Quote Today!
