---
title: "Hastelloy Machining | C-276, C-22, X & B-3 Nickel Alloy Parts | OpenSpindle"
description: "Get quotes for custom Hastelloy parts from qualified nickel-superalloy shops. C-276, C-22, X, and B-3 machined, welded, and finished for the most aggressive chemical and high-temperature service. Upload a drawing."
canonical: https://openspindle.com/materials/hastelloy
---

# Get quotes for custom Hastelloy parts

Hastelloy is the trade name for a family of nickel-molybdenum-chromium superalloys engineered for the most aggressive acid, chloride, and high-temperature service. Shops that run Inconel often run Hastelloy; both need rigid machines, carbide tooling, and the sourcing to get the certified bar. Upload your drawing and we route it accordingly.

## Hastelloy grades shops run most

Each grade targets a specific chemical environment. Specify the exact alloy on the drawing; substitutions change corrosion performance.

### Hastelloy C-276 (UNS N10276)

The most widely used Hastelloy. 16% Mo, 15% Cr, 4% W, balance Ni. Best general-purpose resistance to oxidizing + reducing media and chloride-induced pitting and crevice corrosion. The standard for chemical-process wet-ends, scrubbers, and offshore sour service.

**Best for:** Chemical process reactors, scrubbers, pump wet-ends, offshore oil & gas, flue-gas desulfurization

### Hastelloy C-22 (UNS N06022)

Higher chromium (22%) than C-276 for stronger oxidizing-acid resistance. Preferred over C-276 for mixed-oxidizer streams and nitric acid service.

**Best for:** Pharma reactor vessels, nuclear waste handling, mixed-oxidizer chemical streams

### Hastelloy X (UNS N06002)

A high-temperature oxidation-resistant Ni-Cr-Fe-Mo alloy. Keeps strength to 1200 °C in air, used for gas-turbine combustors, nozzles, and furnace hardware. Not primarily a wet-corrosion alloy.

**Best for:** Gas turbine combustors, aircraft engine parts, furnace components

### Hastelloy B-3 (UNS N10675)

A Ni-Mo alloy with excellent resistance to hydrochloric acid and reducing media at all concentrations and temperatures. The specialist for HCl service and similar reducing environments.

**Best for:** HCl and sulfuric acid service, specialty chemical reactors

### Hastelloy G-30 (UNS N06030)

Developed for phosphoric and sulfuric acid service in fertilizer and metals-refining industries.

**Best for:** Phosphoric acid production, metals refining, specialty acid service

## Material Properties

Representative values for Hastelloy C-276 (solution annealed). Other C-series and B-3 are similar density; X is formulated for high-temperature strength.

| Property | Value |
| --- | --- |
| Density (C-276) | 8.89 g/cm³ (0.321 lb/in³) |
| Melting range (C-276) | 1325–1370 °C |
| Tensile strength (annealed) | ~110 ksi min |
| Yield strength (annealed) | ~45 ksi min |
| Elongation | ~40% min |
| Hardness (annealed) | ~90 HRB |
| Machinability | Poor; similar to Inconel 625. Rigid setups, carbide, modest SFM. |
| Welding | Readily welded; matching filler (ERNiCrMo-4 for C-276). |
| Max continuous service (C-276) | ~1040 °C in air; much lower in corrosive liquid service |

Hastelloy work-hardens rapidly. Keep the cutter engaged (no dwell), use positive geometry, and expect 20–40% of the SFM you would run on 316 stainless.

## Processes That Run This Material

- [CNC Machining](https://openspindle.com/capabilities/cnc-machining.md) -- Rigid 3-, 4-, and 5-axis for pocketed and contoured Hastelloy brackets, flanges, and wet-end components.
- [CNC Turning](https://openspindle.com/capabilities/cnc-turning.md) -- Shafts, pump impellers, and valve trim turned from Hastelloy bar.
- [5-Axis Machining](https://openspindle.com/capabilities/5-axis-machining.md) -- Contoured chemical-process and aerospace parts in a single setup.
- [Welding & Metal Fabrication](https://openspindle.com/capabilities/welding.md) -- TIG/MIG weldments and reactor fabrications with matching NiCrMo filler.
- [EDM & Wire EDM](https://openspindle.com/capabilities/edm.md) -- Features in work-hardened Hastelloy where mechanical cutting falls off.
- [Precision Grinding](https://openspindle.com/capabilities/precision-grinding.md) -- Finished shaft and seal-face surfaces on pump and valve components.

## Finishes

Hastelloy is usually left as-machined or passivated; the alloy itself provides corrosion resistance that would be the job of a coating on stainless.

- **As-machined** -- Standard for most industrial parts.
- **Pickled & passivated** -- Removes heat tint and surface iron contamination from machining and welding; restores full corrosion resistance.
- **Electropolished** -- Mirror finish on reactor internals and food/pharma wet-ends to reduce particulate adhesion.
- **Shot peened** -- For fatigue-critical aerospace parts (common on Hastelloy X turbine components).

Specify the surface condition on the drawing. For chemical service, call out pickle + passivate per ASTM A967; for pharma, electropolish to a defined Ra.

## Applications

- Chemical process reactors and heat exchangers
- Flue-gas desulfurization components
- Offshore and sour-service oil and gas hardware
- Pulp and paper bleaching equipment
- Pharma and biotech wet-ends
- Nuclear waste handling
- Gas turbine combustors (Hastelloy X)
- Pollution control scrubbers

Hastelloy wins when the service environment eats stainless. Hard to justify when stainless would do; indispensable when it would not.

## How It Compares

How Hastelloy compares to the alloys buyers consider alongside it.

### [Inconel 625](https://openspindle.com/materials/inconel.md)

- Both are Ni-Cr-Mo superalloys with excellent high-temperature and corrosion properties
- Hastelloy C-276 has higher Mo content, better pitting and crevice resistance in chlorides
- Inconel 625 is better in high-temperature oxidation and generally lower cost

**Verdict:** Choose Hastelloy for the most aggressive wet-chemical service. Choose Inconel 625 for high-temperature or dual-service parts.

### [316L stainless steel](https://openspindle.com/materials/stainless-steel.md)

- Hastelloy costs several times more per pound than 316L
- Hastelloy resists chloride pitting and reducing acids where 316L fails outright
- If 316L passes your corrosion test, there is no reason to spec Hastelloy

**Verdict:** Choose Hastelloy only when 316L (or 904L / duplex) is proven inadequate. Choose stainless for general industrial service.

### [Titanium](https://openspindle.com/materials/titanium.md)

- Titanium resists seawater and oxidizing chlorides even better than C-276
- Hastelloy handles reducing acids (HCl, H2SO4) where titanium fails
- Weigh the exact chemistry; "chemical resistant" is not transferable between the two

**Verdict:** Specify by chemistry, not category. Titanium for oxidizing/chloride service; Hastelloy for reducing acids and mixed streams.

## Frequently Asked Questions

### What is the difference between Hastelloy C-276 and C-22?

Both are Ni-Cr-Mo superalloys with similar wet-corrosion performance. C-22 has higher chromium (22% vs 16%) for better oxidizing-acid resistance and improved weldability without post-weld heat treatment. C-276 is the general-purpose default; C-22 wins in mixed-oxidizer streams (nitric + HCl) and where field welds will not be heat-treated.

### Can Hastelloy be welded?

Yes, readily. Use matching NiCrMo filler (ERNiCrMo-4 for C-276, ERNiCrMo-10 for C-22) with low heat input. Post-weld heat treatment is not required for the C-series in most service, which is a major advantage over some stainless alloys. Full documentation (filler lot, procedure, operator qualification) is standard for pressure and sour-service work.

### Why is Hastelloy so expensive?

Three reasons: high nickel content (50%+ Ni, which tracks the LME nickel price), high molybdenum and tungsten content (both are expensive refractory metals), and mill supply is concentrated with a few producers (Haynes International, Special Metals). Expect 4–8× the per-pound cost of 316L stainless and factor longer lead times for off-the-shelf stock.

### How does Hastelloy machine?

Similar to Inconel 625: carbide tooling with positive geometry, modest SFM (around 50–120 depending on operation), rigid setup, and tool paths that keep the cutter engaged. Work hardening is aggressive, so dwell on a feature creates a hardened layer that destroys the next pass. Shops familiar with Inconel adapt quickly; general stainless shops often struggle.

### What quantities make sense?

Prototype 1–50 for aerospace and chemical-process; low-volume production 50–500 for pump and valve components; batch production for specialty wet-ends. Mill lead times on uncommon sizes can run 8–12 weeks; shops with existing accounts and inventory for 1-inch to 4-inch bar can turn common sizes faster.

### What certifications are typical?

ASME Section VIII (pressure vessel), ASME Code case specific to the alloy, NACE MR0175 (sour service for oil and gas), AS9100 (aerospace, for Hastelloy X combustor parts). Mill certs with heat lot traceability are the baseline; PMI/XRF alloy verification is routinely required.

## Related Materials

- [Inconel / Nickel Superalloys](https://openspindle.com/materials/inconel.md)
- [Monel](https://openspindle.com/materials/monel.md)
- [Titanium](https://openspindle.com/materials/titanium.md)
- [Stainless Steel](https://openspindle.com/materials/stainless-steel.md)
- [Cobalt-Chrome](https://openspindle.com/materials/cobalt-chrome.md)

## Need Hastelloy parts machined, welded, or finished?

Upload a drawing and we route it to shops with the right equipment, mill sourcing, and certifications for your service -- chemical process, aerospace, oil & gas, or nuclear.