Nickel 201 Low-Carbon Pure Nickel Flanges Manufacturer & Supplier
Metinox Overseas is one of the leading manufacturers and suppliers of Nickel 201 Flanges which is a low-carbon commercially pure nickel (99.6% minimum) grade that is specifically designed to work in a high-temperature environment above 315C with high graphitization embrittility and with excellent corrosion resistance in caustic alkalies and in reducing environment. Our UNS N02201 Forged Flanges are produced using the finest low-carbon commercially pure nickel with controlled chemical composition that includes nickel plus cobalt (99.0), carbon (0.02 maximum - much lower than Nickel 200) as well as minimal alloying elements, which provides minimum tensile strength of 380 Mpa, high ductility, and high performance in high temperature without any concerns of graphitization. These Low-Carbon Nickel 201 Flanges offer excellent performance in high temperature caustic service at temperatures above 315 C, dry halogen gases at high temperatures, reducing atmospheres at high temperatures, and in any high temperature where Nickel 200 can perform, so that they are well adapted to high temperature chemical processing, chlor-alkali high-temperature sections, caustic concentrators, electronics manufacturing at high temperatures, and aerospace high-temperature applications.
This is due to the very low carbon level (0.02% vs 0.15% of Nickel 200) causing no graphite to precipitate at the grain boundaries during exposure to high temperatures, thus doing away with the graphitization embritteness that restricts Nickel 200 to 315 C. Our Nickel 201 Weld Neck Flanges, Slip-On Flanges, Blind Flanges and Socket Weld Flanges are produced to full ANSI/ASME B16.5 (1/2 to 24 NB) and ASME B16.47 Series A and B (26 to 60 NB) dimensional standards, with pressure classes of 150 -600 #. All flanges are delivered in the annealed state (stress-relieved at 870-1090 o C) with stringent quality controls such as dimensional inspection, PMI check, carbon content check (<0.02% critical), tensile check, hardness check and ultrasonic check as per the ASTM B564 requirements.
Table of Contents
- Nickel 201 Flanges Technical Specifications
- Nickel 201 Equivalent Grades
- Nickel 201 Chemical Composition
- Mechanical Properties of Nickel 201 Flanges
- Nickel 201 Flange Dimensions & Pressure Rating Chart
- Types of Nickel 201 Flanges Available
- Standard Flange Sizes & Weight Chart
- Is Nickel 201 Good Quality for High-Temperature Caustic Service?
- Heat Treatment & Testing Requirements
- Nickel 201 Low-Carbon Nickel Flanges Price List 2026
- Applications of Nickel 201 Flanges in Industry
- Why Choose Nickel 201 Flanges from Metinox Overseas?
- Nickel 201 Flange Delivery Time & CIF Pricing by Country
- Other Types of Nickel 201 Flanges
- Popular Locations Where We Supply Nickel 201 Flanges
- Frequently Asked Questions (FAQ)
Nickel 201 Flanges Technical Specifications
| Feature | Details |
| Specifications | ASTM B564 / ASME SB564 / ASTM B162 / ASME SB162 / DIN 2.4068 |
| Grade | Nickel 201 (Low-Carbon Commercially Pure Nickel) |
| UNS Number | N02201 |
| DIN/EN Number | 2.4068 / NiCu30FeMn (similar) |
| Werkstoff Nr. | 2.4068 |
| Dimensional Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, MSS SP-44 |
| Size Range | 1/2" (15 NB) to 60" (1500 NB) |
| Pressure Class | 150#, 300#, 600# (higher classes limited availability) |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Orifice, Long Weld Neck |
| Flange Face | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female, Tongue & Groove |
| Manufacturing Type | Hot Forged, Annealed |
| Heat Treatment | Annealed (Stress-Relieved) at 870-1090-C (Mandatory) |
| Testing | Tensile, Hardness, PMI, Carbon Analysis (<0.02% verification), Grain Size, Ultrasonic |
| Inspection | Third Party Inspection by TUV, SGS, Bureau Veritas, Lloyd's, DNV GL, BV, ABS |
| Certifications | EN 10204 3.1B/3.2 MTC, NACE MR0175, PED 2014/68/EU, CE Marked, ASME B31.3 |
Nickel 201 Equivalent Grades
| STANDARD | USA | GERMANY | EUROPE | FRANCE | UK | RUSSIA | JAPAN |
| Nickel 201 | UNS N02201 ASTM B564 ASME SB564 |
2.4068 NiCu30FeMn |
EN 2.4068 | NU-30MD | NA12 | ??2? | NW2201 |
Note: Nickel 201 is low-carbon version of Nickel 200. "201" designation indicates low-carbon modification for high-temperature service >315-C.
Nickel 201 Chemical Composition
| Element | Composition (%) | Function |
| Nickel + Cobalt (Ni+Co) | 99.0 minimum | Base metal, provides corrosion resistance (Co counted as Ni) |
| Carbon (C) | 0.02 max | Ultra-low carbon to prevent graphitization above 315-C |
| Manganese (Mn) | 0.35 max | Trace element |
| Iron (Fe) | 0.40 max | Impurity, controlled low |
| Sulfur (S) | 0.010 max | Minimized for hot workability |
| Silicon (Si) | 0.35 max | Trace element |
| Copper (Cu) | 0.25 max | Impurity, controlled low |
Note: Key difference vs Nickel 200: carbon limited to 0.02% max (vs 0.15% max for N02200). Ultra-low carbon prevents graphitization embrittlement at temperatures above 315-C (600-F).
Mechanical Properties of Nickel 201 Flanges
| Property | Annealed Condition | Testing Standard |
| Tensile Strength | 380 - 550 MPa (55-80 ksi) | ASTM E8 |
| Yield Strength (0.2% offset) | 105 - 275 MPa (15-40 ksi) | ASTM E8 |
| Elongation in 2" | 40% minimum (typically 45-55%) | ASTM E8 |
| Hardness (Rockwell B) | 60-90 HRB (120-180 HB) | ASTM E18 |
| Hardness (Brinell) | 120-180 HB typical | ASTM E10 |
Note: Mechanical properties nearly identical to Nickel 200. Advantage of Nickel 201 is high-temperature stability, not superior room-temperature properties.
Nickel 201 Flange Dimensions & Pressure Rating Chart
Pressure-Temperature Ratings for Nickel 201 Flanges
| Temperature -F (-C) | Class 150 | Class 300 | Class 600 |
|---|---|---|---|
| -20 to 100 (-29 to 38) | 275 psi | 720 psi | 1440 psi |
| 200 (93) | 238 psi | 620 psi | 1240 psi |
| 300 (149) | 219 psi | 571 psi | 1142 psi |
| 400 (204) | 204 psi | 532 psi | 1065 psi |
| 500 (260) | 193 psi | 503 psi | 1006 psi |
| 600 (316) | 184 psi | 481 psi | 961 psi |
| 700 (371) | 168 psi | 438 psi | 876 psi |
| 800 (427) | 154 psi | 401 psi | 803 psi |
| 900 (482) | 141 psi | 368 psi | 735 psi |
| 1000 (538) | 129 psi | 337 psi | 673 psi |
Note: Nickel 201 suitable to 650-C (1200-F) without graphitization concerns. Above 315-C, Nickel 201 MUST be used instead of Nickel 200.
Types of Nickel 201 Flanges Available
Nickel 201 Orifice Flange
Nickel 201 Threaded Flange
Nickel 201 Reducing Flange
Nickel 201 Lap Joint Flange
Nickel 201 Long Weld Neck Flange
Nickel 201 Socket Weld Flange
Nickel 201 Weld Neck Flange
Nickel 201 Blind Flange
Nickel 201 Slip-On Flange
Standard Flange Sizes & Weight Chart
Nickel 201 Weld Neck Flange Dimensions (ANSI B16.5) - Class 150 Sample
| NPS | Outside Diameter (mm) | Thickness (mm) | Bore (mm) | Hub Dia (mm) | Bolt Circle (mm) | No. of Bolts | Bolt Dia | Approx Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| 1/2" | 90 | 11 | 21 | 35 | 60 | 4 | M12 | 0.52 |
| 1" | 108 | 13 | 33 | 50 | 79 | 4 | M12 | 1.00 |
| 2" | 152 | 16 | 60 | 75 | 121 | 4 | M16 | 2.08 |
| 4" | 229 | 19 | 114 | 127 | 190 | 8 | M16 | 6.25 |
| 6" | 267 | 21 | 168 | 184 | 229 | 8 | M19 | 9.95 |
| 8" | 330 | 24 | 219 | 238 | 286 | 8 | M19 | 16.8 |
| 10" | 406 | 27 | 273 | 305 | 362 | 12 | M22 | 27.8 |
| 12" | 483 | 29 | 324 | 346 | 432 | 12 | M22 | 41.7 |
| 16" | 597 | 32 | 419 | 448 | 546 | 16 | M25 | 74.2 |
| 20" | 699 | 38 | 508 | 559 | 648 | 20 | M25 | 112.0 |
| 24" | 813 | 44 | 610 | 651 | 756 | 20 | M32 | 173.0 |
Note: Dimensions and weights identical to Nickel 200. Density 8.89 g/cm-.
Is Nickel 201 Good Quality for High-Temperature Caustic Service?
Yes, Nickel 201 is the necessary product to give high-temperature caustic service over 315o C (600o F) and offers all the same benefits of corrosion protection as Nickel 200, except the susceptibility to graphitization embrittlement at lower temperatures. The extremely low amount of carbon (maximum at 0.02% vs. 0.15% in Nickel 200) ensures that even in long term temperatures above 315C the carbon does not form graphite at the grain boundaries, allowing the continuous service to 650C (1200F).
The graphitization phenomenon that inhibits Nickel 200 takes place when the carbon precipitate is in the form of graphite flakes at the grain boundaries and it becomes active at temperatures above 315 o C resulting in intense embrittlement and intergranular cracking. This causes equipments to be brittle and prone to disastrous collapse. Ultra-low carbon of Nickel 201 eliminates this risk and is therefore the required solution to: high temperature caustic evaporators and concentrators above 315C, molten salt caustic handling at higher temperatures, high temperature reducing atmospheres in heat treatment furnaces, dry halogen gas handling above 315C and any application where Nickel 200 would otherwise be suitable but where operating temperature is above its 315C limit.
Nickel 201 has the same corrosion resistance as Nickel 200 against: sodium hydroxide (caustic soda) in all concentrations and temperatures, hydrofluoric acid (all concentrations), elemental fluorine and fluoride compounds, dry chlorine and hydrogen chloride gases, reducing acids with no oxidizing contaminants, high temperature water and steam (non-oxidizing) and molten caustic salts. The material has good mechanical properties and ductile even when subjected to high temperatures over a long period such as Nickel 200 which embrittles.
Its low carbon content is also favorable in welding Nickel 201 is also less prone to carbide formation in heat affected areas, minimizing chances of intergranular corrosions in the welded part. Post-weld heat treatment is effective to regain corrosion resistance with no possibility of graphitization throughout the stress relief cycle.
At temperatures lower than 315 C, both Nickel 200 and Nickel 201 can be employed depending on economics and availability- Nickel 200 is more cost-effective and more readily available to lower temperature service. Above 315-C, Nickel 201 is mandatory. The transition temperature of 315o C (600o F) is established over decades of industrial experience and is given in ASTM standards.
Nickel 201 is designed to serve: chlor-alkali plants with high-temperature caustic concentrators that are running above 315 o C, molten caustic salt systems, high-temperature furnace components in reducing atmosphere, high temperature dry halogen gas processing, electronics production having a high temperature operation, aerospace applications where pure nickel performance in high temperature is important, and any high temperature use where the graphitization-free action is paramount. The material reflects an ideal performance on high temperature pure nickel applications, where prices are normally 5-10% greater than Nickel 200 as more rigorous carbon control is subjected to during the process of melting and refining.
Heat Treatment & Testing Requirements
Heat Treatment Process (Mandatory):
Annealing (Stress Relief):
- Temperature: 870-1090-C (1600-2000-F)
- Holding Time: Adequate soaking based on thickness
- Cooling: Air cool or water quench (both acceptable)
- Purpose: Stress relief, grain size control, optimize ductility
- Critical: Ultra-low carbon (0.02% max) must be verified through controlled melting and refining process. Vacuum melting or special refining techniques ensure carbon below 0.02%.
Testing Requirements (Stringent Carbon Verification):
- Tensile Testing: Tensile 380-550 MPa, yield 105-275 MPa, elongation =40%
- Hardness Testing: 60-90 HRB (120-180 HB) typical
- PMI Testing: Verify Ni+Co =99.0%, low Fe, Cu impurities
- Carbon Analysis: CRITICAL - Verify carbon =0.02% (combustion analysis mandatory)
- Chemical Analysis: Complete product analysis with carbon verification by LECO or combustion method
- Grain Size: ASTM grain size determination when specified
- Ultrasonic Testing: Per ASTM B564 for critical applications
- Metallographic Examination: May be specified to verify freedom from graphite precipitation
Nickel 201 Low-Carbon Nickel Flanges Price List 2026
| Flange Type | Size Range | Pressure Class | Indicative Price Range (USD/Piece) |
|---|---|---|---|
| Weld Neck (WN) | 1/2" - 2" | 150# | $195 - $515 |
| Weld Neck (WN) | 4" - 8" | 150# | $795 - $3,250 |
| Weld Neck (WN) | 10" - 24" | 150# | $4,920 - $17,900 |
| Weld Neck (WN) | 1/2" - 2" | 300# | $290 - $760 |
| Weld Neck (WN) | 4" - 8" | 300# | $1,225 - $4,950 |
| Weld Neck (WN) | 10" - 24" | 300# | $7,250 - $26,100 |
| Weld Neck (WN) | 1/2" - 2" | 600# | $435 - $1,120 |
| Weld Neck (WN) | 4" - 8" | 600# | $1,830 - $7,250 |
| Slip-On (SO) | 1/2" - 2" | 150# | $165 - $430 |
| Slip-On (SO) | 4" - 8" | 150# | $665 - $2,720 |
| Slip-On (SO) | 10" - 24" | 150# | $4,100 - $14,900 |
| Blind (BL) | 1/2" - 2" | 150# | $150 - $395 |
| Blind (BL) | 4" - 8" | 150# | $720 - $2,930 |
| Socket Weld (SW) | 1/2" - 2" | 150# - 600# | $220 - $905 |
Note: Nickel 201 flanges typically 5-10% higher than Nickel 200 due to ultra-low carbon requirement and more stringent melting/refining process. Prices fluctuate with LME nickel prices.
Applications of Nickel 201 Flanges in Industry
The Nickel 201 Low-Carbon Pure Nickel Flanges are commonly used in many industrial applications, and some of the common industries are given below.
High-Temp Chlor-Alkali
Caustic concentrators >315-C, high-temperature evaporators, molten caustic systems
Caustic Processing
High-temperature NaOH handling, caustic melt systems, evaporative crystallizers >315-C
Chemical Processing
High-temperature HF acid systems, fluorine processing >315-C, reducing environments at elevated temperatures
Aerospace
Rocket engine components, gas turbine high-temp parts, high-temperature furnace fixtures
Electronics
Semiconductor manufacturing high-temp processes, high-temperature annealing furnaces
Heat Treatment
Furnace components in reducing atmospheres, high-temp neutral atmosphere furnaces
Glass Manufacturing
Molten glass contact parts, high-temperature glass melting equipment
Molten Salts
High-temperature molten salt systems, salt bath heat treatment
Synthetic Fiber
High-temperature rayon processing, high-temp fiber production equipment
Research
High-temperature laboratory equipment, materials testing at elevated temperatures
Why Choose Nickel 201 Flanges from Metinox Overseas?
Metinox Overseas provides certified Nickel 201 low-carbon pure nickel flanges with assured carbon less than 0.02 percentage, obligatory annealing and full traceability requirements in critical high temperature caustic and reducing environment uses above 315 degree Celsius. All our ISO 9001:2015 certified plants produce all of the Nickel 201 flange out of ultra-low-carbon nickel material that has been checked with a carbon content by means of a combustion analysis.
Each flange is shipped with EN 10204 3.1B or 3.2 Mill Test Certificates that contain complete chemical analysis of Ni+Co 99.00, carbon 0.02, and Fe 0.40, Cu 0.25, tensile properties of tensile 380-550 Mpa and elongation 40, as so hardness 60-90 HrB and ASTM B564 compliance statements. We offer compulsory carbon verification testing by LECO or any other combustion technique (infrared affirmation in the wake of combustion in oxygen), PMI testing to confirm pure nickel composition, and provenance to virgin nickel cathode with controlled low-carbon melting.
Technical advice: Our technical department will provide expert advice on the choice between Nickel 200 or Nickel 201 (required to be Nickel 201 at 315 and above), graphitization prevention (required), welding process using AWS A5.14 ERNi-1 filler metal with weakened carbon welding, high temperature caustic corrosion information, and NACE MR0175. Having vast experience of delivering Nickel 201 flanges to high temperature chlor-alkali concentrators, aerospace manufacturers and electronics processors across the world, we guarantee high quality of our products to be used in mission-critical high temperature.
Acquiring chlor-alkali manufacturers, aerospace, electronic fabricators, and specialty chemical plants that needed performance free of graphitization in more than 60 countries.
Nickel 201 Flange Delivery Time & CIF Pricing by Country
| Destination Region | Major Ports / Cities | Estimated Delivery Time | Typical CIF Terms |
|---|---|---|---|
| Middle East (GCC) | Dubai, Dammam, Doha | 18-22 Days | CIF Dubai / CIF Dammam |
| Europe | Rotterdam, Hamburg | 32-40 Days | CIF Rotterdam / CIF Hamburg |
| USA & Canada | Houston, New York | 40-50 Days | CIF Houston / CIF New York |
| Southeast Asia | Singapore, Port Klang | 22-30 Days | CIF Singapore / CIF Port Klang |
| Africa | Lagos, Durban | 30-40 Days | CIF Lagos / CIF Durban |
Other Types of Nickel 201 Flanges
Nickel 201 Low-Carbon Flanges, UNS N02201 Flanges, Low-Carbon Pure Nickel Flanges, Nickel 201 Weld Neck Flanges, Nickel 201 Slip-On Flanges, Nickel 201 Blind Flanges, Nickel 201 High-Temperature Flanges.
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Frequently Asked Questions (FAQ)
Nickel 201 contains ultra-low carbon (max 0.02 versus 0.15) in Nickel 200. They both have 99.0 percent min Ni+Co and the same corrosion resistance. KEY DIFFERENCE: Nickel 200 with a maximum temperature of 315 o C (600 F) graphitizing; Nickel 201 with maximum temperature of 650 o C (1312 F) non-graphitizing. Above 315-C, Nickel 201 MANDATORY.
Graphite forms on grain boundaries at temperatures above 315C (600F) and precipitates carbon in Nickel 200, resulting in severe embrittlement (graphitization). Intergranular rupture and brittle material. 315C is solid ductile temperature. Under 315 C grade is fair; over 315 C MUST use Nickel 201.
Yes, Nickel 201 is usable in both cryogenic and 650 o C temperatures. At temperatures below 315 C, either Nickel 200 or Nickel 201 acceptable - Nickel 200 less expensive. Above 315-C, only Nickel 201. In cases where equipment might occasionally exceed 315 o C or when in doubt, please state Nickel 201 as a safety factor.
Minimized carbon pickup during melting is achieved by use of vacuum melting, controlled atmosphere melting, or special refining techniques. Carbon content confirmed using the combustion analysis (LECO method). To obtain a 0.02% carbon, it is necessary to control it meticulously, which is even more costly than Nickel 200.
No, mechanical properties at room temperature almost the same. High-temperature stability and graphitization resistance is a benefit of Nickel 201 rather than high strength and ductility. They both have tensile 380-550 Mpa yield 105-275 Mpa elongation 40/more.
filler matching filler of AWS A5.14 ERNi-1 (commercially pure nickel) standard. Filler metal is also supposed to be low-carbon version in case of critical high-temp usage. GTAW preferred. Recommendations in post-weld stress relief of 870-1090 C it does not matter whether it is graphitized or not.
Yes, an average of 5-10 percent more expensive because of ultra-low carbon demand and increased control over melting/refining. Premium To be used at high-temperature above 315 C where no graphitization is required. Nickel 200 is less expensive below 315 o C.
Yes, it is good with molten caustic (100% NaOH) at high temperatures (as high as 370C and higher). The low carbon content inhibits the graphitization during the long-time exposure at high temperature. Optimal in caustic melt systems, evaporative crystallizers and caustic high temperature concentrators.
Combustion (LECO method or infrared detection of combustion in oxygen) required. Normal optical emission spectroscopy (OES/PMI) does not work with very low carbon concentrations. The carbon by combustion method should be indicated in the Mill test certificate.
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