Investment Casting
Fittings
What are Investment Casting Fittings?
Investment Casting Fittings are precision-engineered pipe fittings manufactured using the lost-wax investment casting process, which allows for intricate shapes, smooth surface finishes, and tight dimensional tolerances. This method is ideal for producing complex fittings with high consistency, especially for small-diameter, high-performance piping systems.
These fittings are used in sanitary, food-grade, pharmaceutical, marine, and instrumentation applications where appearance, accuracy, and corrosion resistance are as important as functionality.
Key Features
Leak-Proof
Jointing
Durable
Construction
Easy Installation
& Removal
Wide
Compatibility
Corrosion
Resistant
Types of Investment Casting Fittings
Specifications
| Specification Category | Parameter / Feature | Details / Options |
|---|---|---|
| Size Range | Nominal Pipe Size (NPS) | ½” to 6” (DN15 – DN150) |
| Pressure Ratings | ANSI / ASME Class | Class 150, 300, 600 |
| PN Ratings | PN6, PN10, PN16, PN25, PN40 | |
| Fitting Types | Threaded Elbow | 45° & 90° (Male/Female), Screwed Ends (NPT/BSP) |
| Tee | Equal Tee, Reducing Tee | |
| Union | 3-Piece Union, Screwed Ends | |
| Socket | Screwed Socket, Reducing Socket | |
| Hose Nipple | Screwed Male Ends, BSP/NPT Threads | |
| Hex Nipple | Male Thread Both Ends (BSP/NPT), Heavy & Light Series | |
| Bushing | Hex Head, Reducing Bushing | |
| Check Nut | Hexagonal Shape, Fine Machined Threads | |
| Material Options | Stainless Steel | SS 304, SS 304L, SS 316, SS 316L, SS 321 |
| Carbon Steel | ASTM A105, ASTM A350 LF2 | |
| Alloy / Superalloy | Inconel 600/625, Monel 400/K500, Hastelloy C22/C276 | |
| Duplex & Super Duplex | Duplex 2205, Super Duplex 2507 | |
| Standards & Certifications | ASME / ANSI | ASME B16.11 (Threaded & Socket), ASME B1.20.1 (Pipe Threads) |
| ASTM | ASTM A351 (Cast SS), ASTM A494 (Ni Alloys) | |
| European Standards | DIN 2950, EN 10242 (Threaded Fittings) | |
| Certifications | ISO 9001, PED 2014/68/EU, NACE MR0175, IBR Approved | |
| Design Features | Threads | NPT, BSP, BSPT, ISO Threads |
| End Connections | Screwed Ends, Male/Female Threads | |
| Wall Thickness | As per ASME & DIN standards | |
| Machining Tolerance | ±0.5 mm (as per ISO 2768) | |
| Coating & Surface Finish | Anti-Corrosion Coating | Rust Preventive Oil, Black Oxide |
| Optional Coatings | Electro-Polished, Epoxy | |
| Surface Finish | Machined, Polished, Passivated | |
| Testing & Inspection | Pressure Testing | Hydrostatic, Pneumatic |
| Non-Destructive Testing | Radiography (RT), Ultrasonic (UT), Magnetic Particle (MPI), Dye Penetrant (DPT) |
Dimensions
| Fitting Type | Size (NPS / DN) | Length (mm) | Thread Size (BSP / NPT) | Hex / OD (mm) | Weight (kg/piece) |
|---|---|---|---|---|---|
| Threaded Elbow 90° | ½” (DN15) | 28 | ½” | 30 | 0.12 |
| Threaded Elbow 90° | 1” (DN25) | 38 | 1” | 38 | 0.25 |
| Threaded Elbow 90° | 2” (DN50) | 60 | 2” | 65 | 0.75 |
| Equal Tee | ½” (DN15) | 32 | ½” | 32 | 0.18 |
| Equal Tee | 1” (DN25) | 45 | 1” | 42 | 0.40 |
| Equal Tee | 2” (DN50) | 72 | 2” | 70 | 1.10 |
| Union (3-Piece) | ½” (DN15) | 60 | ½” | 34 | 0.22 |
| Union (3-Piece) | 1” (DN25) | 75 | 1” | 50 | 0.50 |
| Union (3-Piece) | 2” (DN50) | 105 | 2” | 80 | 1.45 |
| Socket (Full Coupling) | ½” (DN15) | 32 | ½” | 28 | 0.14 |
| Socket (Full Coupling) | 1” (DN25) | 45 | 1” | 40 | 0.35 |
| Socket (Full Coupling) | 2” (DN50) | 78 | 2” | 65 | 0.95 |
| Hose Nipple | ½” (DN15) | 50 | ½” | 20 | 0.10 |
| Hose Nipple | 1” (DN25) | 75 | 1” | 28 | 0.22 |
| Hose Nipple | 2” (DN50) | 110 | 2” | 42 | 0.55 |
| Hex Nipple | ½” (DN15) | 45 | ½” | 27 | 0.12 |
| Hex Nipple | 1” (DN25) | 60 | 1” | 36 | 0.28 |
| Hex Nipple | 2” (DN50) | 90 | 2” | 55 | 0.75 |
| Bushing (Reducing) | 1” x ½” (DN25 x DN15) | 20 | 1” × ½” | 30 | 0.08 |
| Bushing (Reducing) | 2” x 1” (DN50 x DN25) | 30 | 2” × 1” | 50 | 0.20 |
| Bushing (Reducing) | 3” x 1½” (DN80 x DN40) | 42 | 3” × 1½” | 70 | 0.38 |
| Check Nut | ½” (DN15) | 12 | ½” | 27 | 0.05 |
| Check Nut | 1” (DN25) | 15 | 1” | 38 | 0.12 |
| Check Nut | 2” (DN50) | 20 | 2” | 60 | 0.28 |
Mechanical Properties
| Property | Value | Unit / Standard |
|---|---|---|
| Tensile Strength | 450 – 750 | MPa (depends on SS 304/316, Alloy Steel, Duplex, etc.) |
| Yield Strength | 170 – 450 | MPa |
| Hardness | 120 – 220 | HB (Brinell, alloy-dependent) |
| Elongation | ≥ 15 – 30 | % |
| Density | 7.7 – 8.0 | g/cm³ |
| Impact Toughness | ≥ 27 – 70 | J (Charpy, depending on grade) |
| Modulus of Elasticity (E) | ~190 – 210 | GPa |
| Fatigue Strength | 180 – 380 | MPa |
| Corrosion Resistance | Excellent for SS / Duplex, Good for Alloy Steel | – |
| Thermal Conductivity | 14 – 25 | W/m·K |
| Coefficient of Thermal Expansion | 11 – 17 ×10⁻⁶ | /°C |
| Yield Ratio (YS/UTS) | 0.40 – 0.60 | – |
| Poisson’s Ratio | 0.27 – 0.30 | – |
| Brinell Hardness Range | 120 – 220 | HB |
| Surface Finish | Ra ≤ 3.2 μm (as-cast), ≤ 0.8 μm (machined / polished) | – |
| Casting Tolerance | ± 0.1 – 0.4 | mm per 25 mm length |
| Operating Temperature Range | -40 to 600 | °C |
| Pressure Rating | PN6 – PN64 / Class 150 – 2500 | ASME / DIN Standards |
Chemical Composition
| Element | SS 304 | SS 304L | SS 316 | SS 316L |
|---|---|---|---|---|
| Chromium (Cr) | 18.0 – 20.0 | 18.0 – 20.0 | 16.0 – 18.0 | 16.0 – 18.0 |
| Nickel (Ni) | 8.0 – 10.5 | 8.0 – 12.0 | 10.0 – 14.0 | 10.0 – 14.0 |
| Carbon (C) | ≤ 0.08 | ≤ 0.03 | ≤ 0.08 | ≤ 0.03 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
| Molybdenum (Mo) | — | — | 2.0 – 3.0 | 2.0 – 3.0 |
Do you have questions?
What makes investment casting better for fittings?
Are these fittings available in duplex or super duplex grades?
Can these fittings be used in food-grade pipelines?
Do investment casting fittings meet international certifications?
