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Material: Hastelloy C4, C22, C276, C2000, B2, B3, G30, X
Type: Round bar,Square bar,Hex bar,Flat bar
Tolerance: H7 H9 H10 H11
Surface: Black or Bright or Pickling white
Diameter: 5~500mm
Length: ≦12M or As Per Client's Requirements.
Hastelloy round bars deliver the highest level of corrosion resistance among nickel alloys, making them the definitive choice for extreme chemical, marine, and high-temperature applications. These bars are engineered for applications where conventional stainless steels (316L, 904L) and even standard nickel alloys fail due to aggressive corrosive media.
JN Alloys supplies a complete range of Hastelloy round bars in grades C-276, C-22, C-2000, B-2, B-3, X, and G-30/G-35. All bars are produced to ASTM, ASME, and international standards, with full material traceability and certification. Available in forged, hot-rolled, cold-drawn, and bright-polished conditions to meet diverse application requirements.
Type | Round Bar Square Bar Hexagon Bar Flat Bar | ||
Surface | Black or Bright or Pickling white | ||
Standard | SUS, AISI, DIN | ||
Manufacture Technique | Hot Rolling, Cold-drawing | ||
Diameter | 5~500mm | ||
Length | ≦12M or As Per Client's Requirements. | ||
Diameter Tolerance | H7 H9 H10 H11 | ||
Material Grade | Hastelloy C4, C22, C276, C2000, B2, B3, G30, X | ||
Key Applications: Chemical processing equipment, reactors, heat exchangers, valve and pump components, flue gas desulfurization systems, sour gas wellhead components, pharmaceutical equipment, and marine/offshore applications.
JN Alloys supplies Hastelloy round bars in multiple forms and surface conditions to meet diverse application requirements. The choice of bar type affects mechanical properties, surface finish, dimensional tolerance, and cost.
Bar Type | Manufacturing Process | Diameter Range | Surface Finish | Tolerance | Mechanical Properties | Typical Application |
Forged Bars | Open-die or closed-die forging | 50–400 mm | Black or rough turned | ASTM A479 | Superior grain structure, high strength | Large shafts, flanges, pressure parts |
Hot-Rolled Bars | Hot rolling from billet | 20–200 mm | Black scale | ASTM A479 | Standard properties, uniform structure | General machining, shafts, pins |
Cold-Drawn Bars | Cold drawing from hot-rolled | 5–100 mm | Bright, smooth | h9–h11 tolerance | Higher strength, closer tolerance | Precision parts, fasteners, bushings |
Centerless Ground | Centerless grinding from cold-drawn | 3–80 mm | Bright, polished | h7–h9 tolerance | Superior surface, tight tolerance | Valve stems, pump shafts, precision pins |
Bright Polished Bars | Polishing from cold-drawn | 5–100 mm | Mirror finish (Ra ≤ 0.4 μm) | h9 tolerance | Aesthetic + functional | Pharmaceutical, food equipment, decorative |
Peeled/Turned Bars | Peeling from forged/hot-rolled | 30–300 mm | Bright, smooth | h11 tolerance | Improved surface, removed decarb | Large-diameter precision parts |
Source: ASTM A479/A479M-23 'Standard Specification for Stainless Steel and Related Alloy Forgings'; ASTM B564-22 'Standard Specification for Nickel Alloy Forgings'; ISO 286-2:2010 'Geometrical Product Specifications — Tolerance Grades'; Haynes International 'Product Forms and Tolerances' (2023).
Diameter Range (mm) | Hot-Rolled Tolerance | Cold-Drawn Tolerance (h9) | Centerless Ground (h7) | Peeled Bar (h11) |
3–6 | ± 0.5 mm | –0.030 / 0 | –0.012 / 0 | N/A |
6–10 | ± 0.5 mm | –0.036 / 0 | –0.015 / 0 | N/A |
10–18 | ± 0.5 mm | –0.043 / 0 | –0.018 / 0 | ± 0.11 mm |
18–30 | ± 0.5 mm | –0.052 / 0 | –0.021 / 0 | ± 0.13 mm |
30–50 | ± 0.8 mm | –0.062 / 0 | –0.025 / 0 | ± 0.16 mm |
50–80 | ± 1.0 mm | –0.074 / 0 | –0.030 / 0 | ± 0.19 mm |
80–120 | ± 1.2 mm | –0.087 / 0 | N/A | ± 0.22 mm |
120–200 | ± 1.5 mm | N/A | N/A | ± 0.25 mm |
> 200 | Per ASTM A479 | N/A | N/A | Per specification |
Source: ISO 286-2:2010 'Geometrical Product Specifications — ISO Code System for Limits and Fits'; ASTM A479/A479M-23; JN Alloys internal manufacturing standards.
JN Alloys offers a complete range of Hastelloy grades for diverse corrosion environments. Each grade is optimized for specific service conditions.
Grade | UNS | EN | Key Elements | Primary Resistance | Max Temp (°C) | Typical Applications | Availability |
C-276 | N10276 | 2.4819 | Ni-Mo-Cr-W | Reducing acids, HCl, H₂SO₄, Cl⁻ | 680 | Chemical reactors, scrubbers, FGD | ✓ Stock |
C-22 | N06022 | 2.4602 | Ni-Cr-Mo-W | Oxidizing + reducing mixtures | 650 | Waste incineration, pharmaceutical | ✓ Stock |
C-2000 | N06200 | 2.4675 | Ni-Cr-Mo-Cu | Broad corrosion resistance + Cu enhancement | 650 | Multi-acid environments, sulfuric plants | ✓ Stock |
B-2 | N10665 | 2.4617 | Ni-Mo | Pure reducing acids (HCl, H₂SO₄) | 540 | HCl production, acetic acid plants | ✓ Order |
B-3 | N10675 | 2.4600 | Ni-Mo | Improved B-2 with better thermal stability | 540 | HCl service, chemical processing | ✓ Stock |
X | N06002 | 2.4665 | Ni-Cr-Fe-Mo | High-temp oxidation, carburization | 1100 | Furnace parts, gas turbine components | ✓ Order |
G-30 | N06030 | 2.4603 | Ni-Cr-Fe-Mo-W | Phosphoric acid, HF, oxidizing acids | 700 | Fertilizer, phosphoric acid plants | ✓ Order |
Source: Haynes International 'HASTELLOY® Alloys' Technical Data Sheets (2023); ASTM B575-22 'Nickel Alloy Plate, Sheet, and Strip'; ASTM B564-22 'Nickel Alloy Forgings'; Special Metals 'Nickel Alloy Product Handbook' (2023).
Grade | UNS | C≤ | Mn≤ | P≤ | S≤ | Si≤ | Ni | Cr | Mo | Fe | Co≤ |
B2 | N10665 | 0.02 | 1.0 | 0.04 | 0.03 | 0.10 | Re | 1.0max | 26.0-30.0 | 2.0max | 1.0 |
B3 | N10675 | 0.01 | 3.0 | 0.03 | 0.01 | 0.10 | 65.0min | 1.0-3.0 | 27.0-32.0 | 1.0-3.0 | 3.0 |
X | N06002 | 0.05-0.15 | 1.0 | 0.04 | 0.03 | 1.0 | Re | 20.5-23.0 | 8.0-10.0 | 17.0-20.0 | 0.5-2.5 |
C22 | N06022 | 0.015 | 0.5 | 0.02 | 0.02 | 0.08 | Re | 20.0-22.5 | 12.5-14.5 | 3.0-6.0 | 2.5 |
C2000 | N06200 | 0.01 | 0.5 | 0.025 | 0.01 | 0.08 | Re | 22.0-24.0 | 15.0-17.0 | 3.0max | 2.0 |
C276 | N10276 | 0.01 | 1.0 | 0.04 | 0.03 | 0.08 | Re | 14.5-16.5 | 15.0-17.0 | 4.0-7.0 | 2.5 |
Grade | UNS | UTS (MPa) | YS (MPa) | Elong. (%) | Hardness (HB) | Density (g/cm³) | Modulus (GPa) | Melting Range (°C) |
C-276 | N10276 | 690–790 | 283–355 | 40–60 | 170–220 | 8.89 | 205 | 1323–1371 |
C-22 | N06022 | 690–760 | 310–380 | 45–62 | 175–230 | 8.69 | 206 | 1357–1399 |
C-2000 | N06200 | 690–760 | 310–350 | 50–65 | 180–230 | 8.50 | 207 | 1343–1382 |
B-2 | N10665 | 620–760 | 276–350 | 40–55 | 165–210 | 9.22 | 217 | 1330–1380 |
B-3 | N10675 | 620–760 | 276–350 | 40–55 | 165–210 | 9.22 | 216 | 1343–1379 |
X | N06002 | 655–795 | 276–345 | 35–50 | 170–220 | 8.22 | 197 | 1260–1355 |
G-30 | N06030 | 620–720 | 276–340 | 45–60 | 165–215 | 8.22 | 202 | 1343–1399 |
Source: ASTM B575-22, B564-22; Haynes International Technical Data Sheets (2023); Special Metals Product Handbook (2023); ASM International 'Atlas of Fatigue Curves' (2006).
All Hastelloy round bars supplied by JN Alloys are manufactured in accordance with international standards and fully traceable to mill certificates. The following standards govern the production, testing, and certification of Hastelloy round bars.
ASTM/ASME Standards
Hastelloy round bars are supplied in accordance with the following international tolerance standards:
ASTM B574 — Chemical and mechanical property tolerances
ASME SB574 — Same as ASTM B574 (pressure vessel code alignment)
ISO 286-2 — h8, h9, h11 diameter tolerance classes
DIN 17752 — Nickel alloy rod and bar dimensions
EN 10278 — Dimensions of bright steel bars
Standard | Title | Applicable Grades | Product Form | Key Requirements |
ASTM B564-22 | Nickel Alloy Forgings | C-276, C-22, B-2, B-3, X, G-30, G-35 | Forged bars, rings, forgings | Heat treatment, tensile, hardness, ultrasonic test |
ASTM B574-20 | Nickel-Molybdenum-Chromium Alloy Rod | C-276, C-22, C-2000, B-2, B-3 | Hot-rolled, cold-drawn bars | Chemical composition, tensile, grain size |
ASTM B446-19 | Nickel-Chromium-Molybdenum-Columbium Alloy Rod | C-276, C-22, C-2000 | Rod, bar | Chemical composition, tensile, corrosion test |
ASTM B335-19 | Nickel-Molybdenum Alloy Rod | B-2, B-3 | Rod, bar | Chemical composition, tensile |
ASME SB-564 | Nickel Alloy Forgings (ASME Code) | All Hastelloy grades | Forgings for pressure vessels | Same as ASTM B564 + ASME IX weldability |
ASME SB-574 | Ni-Mo-Cr Alloy Rod (ASME Code) | C-276, C-22, C-2000, B-2, B-3 | Bars for pressure parts | Same as ASTM B574 + ASME compliance |
Applicable ASTM / ASME / International Standards
Standard | Scope / Coverage | Applicable Grades |
ASTM B574 / ASME SB574 | Chemical composition, mechanical properties, dimensions — Ni-Mo-Cr alloys | C-276, C-22, C-2000, B-3, X, G-30 |
ASTM B572 / ASME SB572 | Ni-Fe-Cr-Mo-Cu alloys (N08020, N08024, N08367) — note: not Hastelloy family but relevant for comparision | N08020 (Alloy 20) |
AMS 5750 | Aerospace material specification — corrosion-resistant alloys bar and wire | C-276, C-22, X |
DIN 17752 | Nickel and nickel alloy rod and bar — German standard | All Hastelloy grades |
ISO 6208 | Nickel and nickel alloys — plate, sheet, strip (referenced for composition) | All grades |
NACE MR0175 / ISO 15156 | Sour service (H2S) environmental cracking resistance | C-276, C-22, B-3 |
NORSOK M-630 | Material data sheets for piping (offshore) | C-276, C-22 |
RCCM Part 2 | Nuclear grade — French design code for nuclear components | C-276 (M3110, M3300) |
Proper heat treatment is essential for achieving the required mechanical properties and corrosion resistance of Hastelloy round bars. All grades are supplied in the solution-annealed condition unless otherwise specified.
Grade | Solution Anneal Temp (°C) | Hold Time (min/mm) | Cooling Method | Critical Notes |
C-276 | 1120–1170 | 3–5 | Water quench or rapid air cool | Avoid 650–870°C range — precipitation zone |
C-22 | 1120–1170 | 3–5 | Water quench or rapid air cool | Similar to C-276 |
C-2000 | 1150–1200 | 3–5 | Water quench or rapid air cool | Cu addition requires higher temp |
B-2 | 1065–1120 | 3–5 | Water quench | Avoid 600–800°C — intermetallic formation |
B-3 | 1065–1120 | 3–5 | Water quench | Improved thermal stability over B-2 |
X | 1175–1205 | 5–10 | Rapid air cool or water quench | High Cr requires higher temp |
G-30 | 1150–1200 | 3–5 | Water quench or rapid air cool | Similar to C-276 |
Source: Haynes International 'Heat Treatment of HASTELLOY® Alloys' (2023); ASTM B564-22 'Nickel Alloy Forgings'; Special Metals 'Heat Treatment Guidelines' (2023).
Q1: What is the difference between Hastelloy C-276 and C-22?
Conclusion: C-276 excels in reducing environments; C-22 offers superior resistance in oxidising environments and mixed acid service.
Hastelloy C-276 (UNS N10276) contains higher molybdenum (15–17 wt%) and tungsten (3–4.5 wt%), making it the benchmark for hydrochloric acid, sulphuric acid, and reducing-acid service. Hastelloy C-22 (UNS N06022) carries higher chromium (~22 wt%) and slightly lower molybdenum (~13 wt%), which improves resistance to oxidising media such as nitric acid, wet chlorine, and mixed acid streams. For chloride-induced pitting and crevice corrosion, both grades are excellent; C-22 holds a marginal edge in highly oxidising chloride environments. Select C-276 for predominantly reducing process streams; select C-22 where the chemistry alternates between oxidising and reducing conditions.
Q2: Can Hastelloy round bars be welded without post-weld heat treatment?
Yes — Hastelloy C-276 and C-22 are routinely welded in the solution-annealed condition without mandatory PWHT.
The low carbon content (≤0.01 wt% for C-276 per ASTM B574) minimises sensitisation and carbide precipitation in the heat-affected zone (HAZ), eliminating the need for PWHT in most service environments. Solution annealing at 1121 °C (2050 °F) followed by rapid quench is performed at the mill; this condition is maintained through welding with matched filler metals (ERNiCrMo-4 for C-276; ERNiCrMo-10 for C-22). PWHT may be specified for extreme sour-service applications per NACE MR0175/ISO 15156 or when component geometry creates high residual stress, but is not a standard requirement.
Q3: What is the maximum service temperature for Hastelloy C-276?
The practical upper limit is 1038 °C (1900 °F) in oxidising gas; for structural load-bearing use, 760 °C (1400 °F) is the recommended ceiling.
Hastelloy C-276 retains useful strength and oxidation resistance to approximately 1038 °C in air or low-oxygen atmospheres. However, prolonged exposure above 760 °C promotes sigma-phase precipitation and TCP (topologically close-packed) phase formation, which reduces room-temperature ductility and corrosion resistance. For continuous high-temperature service above 760 °C, Hastelloy X (UNS N06002) or Inconel 625 (UNS N06625) are typically preferred. In aqueous corrosion service — the primary application for C-276 round bar — temperature limits are defined by the corrosive medium rather than alloy capability.
Q4: Is Hastelloy magnetic?
No — Hastelloy C-276 and C-22 are austenitic nickel alloys and are essentially non-magnetic in the solution-annealed condition.
The austenitic (FCC) crystal structure of the Hastelloy C-family renders these alloys non-ferromagnetic with a relative magnetic permeability (μr) typically below 1.002 — comparable to 316L stainless steel. This makes C-276 round bar suitable for applications requiring non-magnetic components such as MRI-adjacent equipment, sensitive instrumentation housings, and subsea sensor mandrels. Cold working can induce a very slight increase in permeability, but it remains negligible compared with ferritic or martensitic grades.
Q5: What cutting speed should I use when machining Hastelloy C-276?
Use 20–40 m/min (65–130 ft/min) surface speed for carbide tooling; reduce to 8–15 m/min for HSS tooling.
Hastelloy C-276 work-hardens rapidly and has high hot strength, requiring conservative cutting parameters. Recommended starting parameters for carbide (C-2/C-3 grade) tooling: surface speed 20–40 m/min, feed rate 0.10–0.20 mm/rev, depth of cut 2–4 mm. Use sharp tooling, positive rake angles (5–10°), and generous flood coolant (sulphur-free for nickel alloys) to control heat build-up. Avoid dwelling or rubbing — maintain a consistent feed to stay below the work-hardened surface layer. Rigid setups and minimal tool overhang are essential. Dull tools cause rapid work hardening, greatly accelerating subsequent tool wear.
Q6: Can Hastelloy C-276 be used in seawater applications?
Yes — C-276 is highly resistant to seawater corrosion, including pitting, crevice corrosion, and biofouling attack.
With a PREN (Pitting Resistance Equivalent Number) of approximately 70–80 — far exceeding the ≥40 threshold commonly specified for offshore service — Hastelloy C-276 resists chloride-induced pitting and crevice corrosion in both ambient and elevated-temperature seawater. It is widely used in seawater desalination, subsea chemical injection systems, offshore valves, and heat exchanger tubing per NORSOK M-630 and NACE MR0175. Unlike duplex stainless steels, C-276 maintains its corrosion resistance at temperatures above 60 °C in stagnant seawater and shows no susceptibility to hydrogen embrittlement in cathodically protected structures.
Q7: What is the lead time for Hastelloy round bars from JN Alloys?
Standard stock sizes typically ship within 3–7 business days; non-stock or custom sizes require 6–12 weeks depending on mill production schedules.
JN Alloys maintains inventory of Hastelloy C-276 round bar in common diameters (typically 12–150 mm) in the solution-annealed condition with full MTRs (Mill Test Reports) per EN 10204 3.1. For stock items, domestic delivery is generally achievable within 3–7 business days. Non-standard diameters, custom-cut lengths, or forged bar requiring specific heat treatment or third-party testing (PMI, ultrasonic inspection) will be subject to mill lead times of 6–12 weeks. Contact JN Alloys with your diameter, length, quantity, and required specifications for a confirmed delivery estimate.
Q8: Is Hastelloy compliant with NACE MR0175 for sour service?
Yes — Hastelloy C-276 is listed in NACE MR0175/ISO 15156-3 as an approved nickel alloy for sour oil and gas service.
NACE MR0175/ISO 15156-3 ("Petroleum and natural gas industries — Materials for use in H₂S-containing environments in oil and gas production, Part 3: Cracking-resistant CRAs and other alloys") explicitly permits Hastelloy C-276 (UNS N10276) for use in environments containing H₂S, CO₂, and chlorides, subject to defined hardness limits (typically ≤40 HRC) and solution-annealed supply condition. It is resistant to sulphide stress cracking (SSC), hydrogen-induced cracking (HIC), and stress-oriented hydrogen-induced cracking (SOHIC) under the environmental severity limits defined in the standard. Confirm specific H₂S partial pressure, temperature, and chloride content against the applicable Table in ISO 15156-3 to verify compliance for your service conditions.
Q9: Can I substitute Hastelloy C-276 with Alloy 825 to reduce cost?
Only in mild service — Alloy 825 is suitable for dilute acid and moderate chloride environments, but is not an equivalent substitute for severe reducing acid or high-chloride service.
Incoloy 825 (UNS N08825) costs approximately 40–60% less than Hastelloy C-276 per kilogram and provides adequate corrosion resistance in moderate sulphuric acid (up to ~50% concentration at room temperature), phosphoric acid, and seawater. However, its lower molybdenum content (2.5–3.5 wt% vs. 15–17 wt% in C-276) and lower PREN (~35–40 vs. ~70–80) render it significantly less resistant to concentrated HCl, wet process phosphoric acid at elevated temperature, pitting in hot chloride environments, and reducing acid service generally. Substitution requires a formal corrosion engineering review against process chemistry, temperature, and velocity parameters. Cost savings are negated if premature failure occurs.
Q10: What surface finish is recommended for hygienic (pharma/food) applications?
Specify Ra ≤ 0.8 µm (32 µin) mechanically polished, or electropolished to Ra ≤ 0.4 µm, in line with ASME BPE and GMP requirements.
For pharmaceutical, biopharmaceutical, and food-contact applications, surface finish directly affects cleanability and microbial retention. The ASME BPE (Bioprocessing Equipment) standard specifies internal surfaces at Ra ≤ 0.8 µm as a minimum; high-purity applications typically require Ra ≤ 0.4 µm achieved by electropolishing (EP). Electropolishing preferentially removes surface iron and chromium-depleted layers, enriching the passive film in chromium and molybdenum and improving both corrosion resistance and cleanability. Hastelloy C-276 round bar can be machined and electropolished to these specifications. Always verify that surface treatments are performed with nickel-alloy-compatible chemistry to avoid iron or copper contamination of the passive layer.
Q11: Does JN Alloys supply custom-cut lengths and machined components?
Yes — JN Alloys offers custom-cut lengths, facing, chamfering, and can facilitate more complex machining through its processing partners.
JN Alloys can supply Hastelloy C-276 and C-22 round bar cut to customer-specified lengths with square or faced ends, with dimensional tolerances per ASTM B574 or tighter on request. Value-added services including rough turning, step turning, and threading are available for specific project requirements. For precision-machined components (valve stems, pump shafts, connector bodies), JN Alloys can coordinate with approved machining partners to provide finished parts with full traceability to original mill MTRs. Provide your dimensional drawing, required tolerances, and surface finish specification at time of enquiry for a complete supply-and-process quotation.
Q12: What is the price ratio of Hastelloy C-276 compared to 316L stainless steel?
Hastelloy C-276 round bar is typically 8–12× more expensive than 316L stainless steel on a per-kilogram basis under prevailing market conditions.
The price premium reflects the high nickel (57 wt% min), molybdenum (15–17 wt%), and chromium (14.5–16.5 wt%) content of C-276, all of which are subject to significant commodity price volatility. As a reference, 316L stainless steel round bar trades at approximately USD 3–5/kg (mill-finished bar, ex-works), while Hastelloy C-276 bar ranges from USD 35–60/kg depending on diameter, quantity, supply condition, and prevailing nickel and molybdenum prices. Total cost of ownership analysis — accounting for service life, maintenance costs, and unplanned downtime risk — frequently justifies C-276 over less resistant alternatives even at this premium. Contact JN Alloys for current pricing against your specific size and quantity requirements.
