When standard grades fail, nickel alloys prevail. Extreme temperatures, aggressive acids, sour gas, and high-pressure hydrogen service — Inconel, Hastelloy, and Monel buttweld fittings for the most demanding applications.
These are the most technically demanding and highest-value fittings in industrial piping. Each grade is engineered for a specific extreme — whether temperature, acid concentration, hydrogen pressure, or seawater.
The most versatile nickel alloy — outstanding fatigue strength, excellent corrosion resistance across a wide range of environments, and high-temperature capability up to 980°C. The go-to choice for offshore risers, subsea equipment, flue gas desulfurization, and marine applications.
Classic high-temperature nickel-chromium alloy with excellent oxidation resistance and carburization resistance up to 1100°C. Used extensively in heat treating equipment, furnace components, and nuclear reactors. The original Inconel alloy.
Nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. Exceptional resistance to both oxidizing and reducing acids — sulfuric, phosphoric, and nitric acids. The bridge between stainless steel and higher-nickel alloys.
The benchmark for corrosion resistance in aggressive chemical environments. Outstanding resistance to oxidizing and reducing media, wet chlorine, hypochlorite, chlorine dioxide, and sulfuric acid at all concentrations. The most widely used Hastelloy alloy in chemical process industries.
Superior to C276 in oxidizing media. Better resistance to pitting, crevice corrosion, and stress corrosion cracking. Higher chromium content (22%) vs C276 (16%) is the key differentiator. Specified for the most aggressive mixed acid environments.
Nickel-copper alloy with excellent resistance to seawater, hydrofluoric acid, and alkaline media. One of the few materials resistant to HF acid at all concentrations and temperatures. Used in marine, chemical, and oil refinery applications.
Commercially pure nickel with excellent resistance to caustic soda (NaOH) and other alkalis at all concentrations and temperatures. Nickel 201 (low carbon) is used above 315°C to prevent graphitization. Essential for caustic service in chemical plants.
| Grade | ASTM | UNS | Ni % | Cr % | Mo % | Max Temp. | Key Resistance |
|---|---|---|---|---|---|---|---|
| Inconel 625 | B366 WPH-625 | N06625 | 58 min | 20–23 | 8–10 | 980°C | Universal corrosion + high temp |
| Inconel 600 | B366 WPH-600 | N06600 | 72 min | 14–17 | — | 1100°C | Oxidation, carburization |
| Incoloy 825 | B366 WPH-825 | N08825 | 38–46 | 19.5–23.5 | 2.5–3.5 | 450°C | Reducing + oxidizing acids |
| Hastelloy C276 | B366 WPH-C276 | N10276 | 57 min | 14.5–16.5 | 15–17 | 1040°C | Wet chlorine, H₂SO₄, HCl |
| Hastelloy C22 | B366 WPH-C22 | N06022 | 56 min | 20–22.5 | 12.5–14.5 | 1040°C | Oxidizing media, mixed acids |
| Monel 400 | B366 WPHM-400 | N04400 | 63–70 | — | — | 480°C | HF acid, seawater, caustic |
| Nickel 200 | B366 | N02200 | 99 min | — | — | 315°C | Caustic soda (NaOH) |
| Nickel 201 | B366 | N02201 | 99 min | — | — | 600°C | High-temp caustic service |
Nickel alloys require deep knowledge to specify correctly. We help customers select the right grade for their environment — preventing costly grade substitution errors.
All nickel alloy fittings sourced from reputed mills with full EN 10204 3.1 Mill Test Certificates. Chemical composition verification against ASTM B366 requirements.
Every nickel alloy fitting is PMI tested before dispatch. Inconel, Hastelloy, Monel, and Nickel look similar — PMI is non-negotiable to prevent dangerous mix-ups.
Nickel alloys are typically needed in smaller quantities. We supply from 1 piece to full project lots — no minimum order for standard items.
For sour service (H₂S) applications, we supply with NACE MR0175 compliance certification. Specify at time of inquiry.
Experienced in shipping high-value nickel alloy fittings with proper wooden crate packing, VCI protection, and complete customs documentation.
Send grade, type, size, schedule, quantity. We respond within 4 hours. High-value, urgent requirements handled with priority.