Tesco Steel & Engineering manufactures Hastelloy C2000 flanges (UNS N06200 / W.Nr. 2.4675) — the copper-bearing nickel-chromium-molybdenum superalloy with ~59% Ni, ~23% Cr, ~16% Mo and ~1.6% copper. The high chromium handles oxidizing media while the molybdenum plus the deliberate copper addition give exceptional resistance in reducing acids such as sulphuric — making C2000 the most versatile Hastelloy C alloy across both oxidizing and reducing conditions, with top-tier pitting, crevice and chloride-SCC resistance. Available in weld neck, slip-on, blind, socket-weld, threaded, lap-joint, spectacle and orifice types to ASTM B564 / ASME B16.5. Class 150 to 2500, NPS 1/2″ to 24″, PN6 to PN400. ISO 9001:2015 certified. Made in India.
Hastelloy C2000 (UNS N06200) Flanges
Hastelloy C2000 Threaded Flange (Polished)
Tesco Steel & Engineering manufactures C2000 flanges in all types from weld neck to orifice, Class 150 to 2500 — supplied with EN 10204 3.1 / 3.2 certification, PMI and third-party inspection on request. Explore the wider Hastelloy flange range, the related Hastelloy C276 flanges and Hastelloy C22 flanges, and the flange dimension charts.
| Hastelloy C2000 flanges are available in the following specifications: | |
|---|---|
| Material Grade | Hastelloy C2000 / UNS N06200 / W.Nr. 2.4675 |
| Alloy Type | Nickel-chromium-molybdenum-copper superalloy (Ni-Cr-Mo-Cu) |
| Size | 1/2″ NB to 24″ NB (DN 15 to DN 600); larger to ASME B16.47 |
| Class / Rating | 150#, 300#, 600#, 900#, 1500#, 2500# · 3000#, 6000#, 9000# (socket-weld / threaded) |
| Pressure Ratings | PN 6 – PN 400 (PN6, 10, 16, 25, 40, 64, 100, 160, 250, 320, 400) |
| Material Standards | ASTM B564, ASME SB564; EN designation 2.4675 |
| Dimensional Standards | ASME B16.5, ASME B16.47 (Series A & B), MSS SP-44, DIN EN 1092-1 |
| Flange Types | Weld Neck (WNRF), Slip-On (SORF), Blind, Socket Weld (SWRF), Lap Joint, Threaded / Screwed, Spectacle Blind, Long Weld Neck, Orifice, Plate |
| Flange Faces | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove (T&G) |
| Weld Filler | ERNiCrMo-17 / ENiCrMo-17 (AWS A5.14 / A5.11) |
| Testing | PMI, hydrostatic, UT, MT/PT per spec; EN 10204 3.1 / 3.2 |
C2000 pairs high chromium (for oxidizing media) with high molybdenum (for localized corrosion) and a deliberate copper addition (for reducing acids such as sulphuric). The very low carbon (0.01% max) and silicon protect welds from sensitization.
| Element | Hastelloy C2000 (UNS N06200) |
|---|---|
| Nickel (Ni) | Balance (~59%) |
| Chromium (Cr) | 22.0 – 24.0% |
| Molybdenum (Mo) | 15.0 – 17.0% |
| Copper (Cu) | 1.3 – 1.9% (reducing-acid resistance) |
| Iron (Fe) | 3.0% max |
| Manganese (Mn) | 0.5% max |
| Aluminium (Al) | 0.5% max |
| Carbon (C) | 0.01% max |
| Silicon (Si) | 0.08% max |
| Mechanical Property (solution annealed, typical) | Hastelloy C2000 |
|---|---|
| Tensile Strength | 690 – 760 MPa (100–110 ksi) |
| Yield Strength 0.2% | 310 – 360 MPa (45–52 ksi) |
| Elongation | 45 – 65% |
| Hardness | ≤ 100 HRB |
| Density | 8.50 g/cm³ |
| Melting Range | 1338 – 1380 °C |
| Standard | Hastelloy C2000 Designation |
|---|---|
| UNS (USA) | N06200 |
| Werkstoff (Germany) | 2.4675 |
| ASTM / ASME | B564 / SB564 (forgings); B574, B575, B619, B622 (other forms) |
| Common names | Hastelloy C-2000, Alloy C2000, Alloy C-2000 |
C2000 Weld Neck Flange (WNRF)
C2000 Slip-On Flange (SORF)
C2000 Blind Flange
| Flange Type | Description & C2000-Specific Use |
|---|---|
| Weld Neck (WNRF) | Tapered hub butt-welded to pipe for high-integrity, high-pressure mixed-acid service; weld with ERNiCrMo-17 filler, no PWHT. |
| Slip-On (SORF) | Fillet-welded over the pipe; common in chemical and sulphuric-acid piping at moderate pressure. |
| Blind | Seals pipe ends and vessel nozzles in reactors and acid systems. |
| Socket Weld (SWRF) | Small-bore (1/2″–2″) instrument and branch connections in corrosive service. |
| Lap Joint (LJRF) | Used with a C2000 stub end where frequent dismantling is required; economizes on alloy in the backing ring. |
| Threaded (TRFF) | Internal NPT/BSP threads for non-welded low-pressure connections. |
| Spectacle Blind / Long Weld Neck / Orifice | Isolation spades, nozzle/long-neck and flow-metering flanges in C2000 for mixed-acid chemical duty. |
| Property | C2000 (N06200) | C276 (N10276) | C22 (N06022) |
|---|---|---|---|
| Chromium | ~23% | ~16% | ~22% |
| Molybdenum | ~16% | ~16% | ~13% |
| Copper | ~1.6% | — | — |
| Tungsten | — | ~3-4% | ~3% |
| Oxidizing-acid resistance | Excellent | Good | Excellent |
| Reducing-acid resistance | Excellent (esp. H2SO4) | Excellent | Very good |
| Typical role | Single alloy for both oxidizing & reducing | Reducing / chloride workhorse | Oxidizing / mixed acids |
High Cr + high Mo + copper make C2000 the most versatile Hastelloy C — resists both oxidizing and reducing acids in one material.
The ~1.6% copper addition gives exceptional resistance across a wide range of sulphuric-acid concentrations and temperatures.
High Mo + Cr give top-tier resistance to localized attack and chloride stress-corrosion cracking.
Very low carbon and silicon resist HAZ sensitization — usable as-welded without PWHT in most applications.
| Industry | Typical Application |
|---|---|
| Chemical Processing | Sulphuric and mixed-acid reactor, column and piping flanges |
| Metal Pickling & Acid Recovery | Hot mixed-acid pickling line and recovery-plant flanges |
| Pharmaceutical & Fine Chemicals | Corrosion-critical process and high-purity flanged joints |
| Flue-Gas & Pollution Control | Scrubber and ducting flanges in acidic chloride service |
| Pulp & Paper | Bleaching and acidic process piping flanges |
| Waste & Effluent Treatment | Aggressive mixed oxidizing/reducing stream flanges |
Made from certified C2000 with PMI verification of Cr, Mo and Cu — full chemistry confirmed on the MTC.
Manufactured to ASTM B564 / ASME B16.5 in the solution-annealed condition for full corrosion resistance.
WNRF, SORF, blind, socket-weld, threaded, lap-joint, spectacle, LWN, orifice and plate — in RF, FF, RTJ and T&G.
EN 10204 3.1 / 3.2 MTC, heat/lot traceability, hydrostatic and third-party inspection on request.
C2000 flange prices reflect the high nickel, chromium and molybdenum content plus the copper addition, forging and machining — it is a premium superalloy for the most versatile corrosion service. Tesco Steel & Engineering offers competitive ex-works pricing from Mumbai with full export documentation and material traceability. Click Ask for Quote or message us on WhatsApp at +91 92233 66922 with flange type, size (NB), pressure class, quantity and documentation requirements.
Q1. What is a Hastelloy C2000 flange?
A Hastelloy C2000 flange is a pipe flange made from the copper-bearing nickel-chromium-molybdenum superalloy UNS N06200 (W.Nr. 2.4675) — about 59% nickel with ~23% chromium, ~16% molybdenum and ~1.6% copper. The high chromium gives outstanding resistance in oxidizing media while the molybdenum plus the deliberate copper addition give exceptional resistance in reducing acids, making C2000 the most versatile Hastelloy C alloy across both oxidizing and reducing conditions. Flanges are forged to ASTM B564 and machined to ASME B16.5 / B16.47 dimensions.
Q2. What is the chemical composition of Hastelloy C2000?
Hastelloy C2000 (UNS N06200) nominal composition: nickel balance (~59%), chromium 22–24%, molybdenum 15–17%, copper 1.3–1.9%, iron 3% max, with very low carbon (0.01% max) and silicon (0.08% max). The combination of high chromium, high molybdenum and the deliberate copper addition is what gives C2000 its uniquely broad resistance across both oxidizing and reducing media.
Q3. Why does Hastelloy C2000 contain copper?
The ~1.6% copper in Hastelloy C2000 dramatically improves resistance to reducing acids — particularly sulphuric acid across a wide range of concentrations and temperatures. Combined with the high chromium (for oxidizing media) and high molybdenum (for localized corrosion), the copper lets C2000 handle both oxidizing and reducing conditions better than C276 or C22, making it a true general-purpose corrosion alloy.
Q4. What is the difference between Hastelloy C2000, C276 and C22?
C2000 (N06200) combines high chromium (~23%) with high molybdenum (~16%) and a copper addition, giving the broadest resistance across both oxidizing and reducing acids of the three. C276 (N10276) has ~16% Cr with ~16% Mo and tungsten — best in reducing/chloride media. C22 (N06022) has ~22% Cr with ~13% Mo — excellent in oxidizing and mixed acids. C2000 is often chosen when a single alloy must handle a wide or unpredictable mix of oxidizing and reducing chemistries, especially with sulphuric acid.
Q5. What standards apply to Hastelloy C2000 flanges?
Hastelloy C2000 flanges are forged to ASTM B564 (UNS N06200) and machined to ASME B16.5 (1/2 inch to 24 inch) or ASME B16.47 / MSS SP-44 for larger sizes, with EN 1092-1 for PN-rated flanges. The European designation is W.Nr. 2.4675. Material is supplied with EN 10204 3.1 / 3.2 certification.
Q6. Can Hastelloy C2000 flanges be welded?
Yes. Hastelloy C2000 has excellent weldability by GTAW (TIG), GMAW and SMAW using matching ERNiCrMo-17 / ENiCrMo-17 filler. Because of its low carbon and silicon it generally needs no post-weld heat treatment and can be used in the as-welded condition. Heat input should be controlled and interpass temperature kept low to preserve corrosion resistance.
Q7. What media is Hastelloy C2000 resistant to?
Hastelloy C2000 resists sulphuric acid (across a wide range), hydrochloric and phosphoric acids, hot contaminated mineral acids, ferric and cupric chlorides, wet chlorine and hypochlorite, organic acids, and many mixed oxidizing/reducing process streams. Its standout strength is handling both oxidizing and reducing conditions — especially sulphuric acid — in a single alloy.
Q8. What are the mechanical properties of Hastelloy C2000?
Typical Hastelloy C2000 properties in the solution-annealed condition: tensile strength about 690–760 MPa (100–110 ksi), yield strength about 310–360 MPa (45–52 ksi), elongation about 45–65%, density 8.50 g/cm³. It combines high strength with excellent ductility and toughness.
Q9. What industries use Hastelloy C2000 flanges?
Hastelloy C2000 flanges are used in chemical processing (especially sulphuric and mixed-acid plants), pharmaceutical and fine chemicals, metal pickling and acid recovery, flue-gas desulphurization and pollution control, pulp and paper, and any service where a single alloy must resist both oxidizing and reducing conditions reliably.
Q10. Are Hastelloy C2000 flanges supplied with material test certificates?
Yes. Every Hastelloy C2000 flange is supplied with EN 10204 3.1 (or 3.2) mill test certificates confirming chemistry, mechanical properties and heat/lot traceability, with PMI, hydrostatic testing and third-party inspection on request. Tesco Steel & Engineering is an ISO 9001:2015 certified manufacturer and exporter from Mumbai, India.