Materials · Nickel-iron alloys
Incoloy fasteners
HAGUE FASTENERS makes Incoloy fasteners to order in the UK: bolts, studs, nuts and machined parts in Incoloy 800, 800H/HT, 825, 925, A286 and Alloy 20, from certified, traceable bar, for heat, acids and sour service.
6 grades
From 800 and 825 to 925 and A286
1 to 500
Single prototypes to batches of several hundred
3.1 / 3.2
EN 10204 certificates with full traceability
UK, EU, US
Mill origin of every bar we use
Why Incoloy
Nickel-iron-chromium alloys for heat and acids
Incoloy is a family of nickel-iron-chromium alloys. Compared with Inconel they contain more iron, which makes them a cost-effective choice for many high temperature and corrosive duties. Incoloy fasteners are used in heat-treating equipment, chemical and petrochemical plant, sour oil and gas wells and gas turbines.
The family divides into heat resisting grades (800 and 800H/HT), corrosion resisting grades (825 and Alloy 20) and precipitation hardening grades for strength (925 and A286). HAGUE FASTENERS machines all of them in Willenhall.
Grades
Incoloy grades we machine
Select a grade for its composition, properties and equivalent designations. The grade supplied always follows your specification.
Incoloy 800
Corrosion and oxidation resistance at high temperature, with resistance to chloride stress corrosion cracking.
Incoloy 800H/800HT
Controlled carbon, aluminium and titanium with a coarse grain for high temperature structural duty.
Incoloy 825
Resists sulphuric and phosphoric acids, pitting and chloride stress corrosion cracking.
Incoloy 925
Age-hardenable for strength in sour, H2S-containing oil and gas wells.
Incoloy A286
Precipitation hardening iron-nickel-chromium alloy for strength to around 700°C; ASTM A453 660.
Incoloy Alloy 20
Excellent resistance to sulphuric acid, with useful resistance to chlorides, nitric and phosphoric acids.
Choosing a grade
Matching the grade to the duty
Typical selections only. Tell us the duty and we will confirm the grade, or suggest an alternative such as Inconel, Hastelloy or super duplex.
| Service environment | Grades usually considered |
|---|---|
| Furnaces, heat-treating fixtures, high temperature | 800, 800H/HT |
| Sulphuric and phosphoric acids | 825, Alloy 20 |
| Sour gas, downhole and wellhead | 925 |
| Gas turbines, high strength at temperature | A286 |
| Chloride stress corrosion cracking | 800, 825 |
| Chemical and pharmaceutical process | 825, Alloy 20 |
What we make
Incoloy fasteners and components
Studs and studbolts
Stud bolts, engineer studs, waisted studs and tie bars
Bolts and screws
Hexagon, 12-point, fitted and special head bolts
Nuts
Hex, heavy hex, jam, flange and special nuts
Washers
Plain, machined, spherical and tab washers
Socket screws
Non-standard cap, set, shoulder and countersunk screws
Turned and milled parts
Plugs, pins, bushes and components to drawing
Proving the material
Certified from mill to final release
Every bar comes from an approved UK, EU or US mill with its certificate, and the heat number is carried through to release. Solution annealing and ageing are carried out by approved partners with furnace charts on request. PMI and chemical analysis confirm the grade where specified, and independent UKAS-accredited testing and EN 10204 3.1 or 3.2 certificates are supplied as your order requires. See quality and testing.
- Mill certificates and heat traceability
- PMI and chemical analysis
- Solution annealing and ageing, with furnace charts
- Elevated temperature tensile and stress rupture testing
- Laser-marked heat codes or part numbers
Questions
Frequently asked questions
What is the difference between Incoloy and Inconel?
Incoloy alloys contain more iron and less nickel than Inconel alloys. That makes Incoloy fasteners a cost-effective choice for many high temperature and acid duties, while Inconel is chosen for higher strength or more severe conditions.
Is A286 the same as ASTM A453 grade 660?
Yes. A286 is the alloy supplied to ASTM A453 grade 660 for high temperature bolting, in classes A to D.
Which Incoloy grade is best for sulphuric acid?
Incoloy 825 and Alloy 20 are the usual choices for sulphuric acid. Both also resist phosphoric acid and chloride stress corrosion cracking.
Can you supply Incoloy 925 for sour service?
Yes. Incoloy 925 resists sulphide stress cracking and stress corrosion cracking in H2S-containing oil and gas, and we make and certify it to your specification.
Do you hold Incoloy bar in stock?
We hold considerable stocks of superalloy bar from UK, EU and US mills, so many orders can start straight away.
Useful tools
Free engineering tools
- Material equivalents finder: find the EN, UNS, ASTM, BS and JIS equivalents of a grade, such as 1.4462 or 316.
- Galvanic corrosion checker: check the corrosion risk when joining dissimilar metals.
- Bar weight calculator: weight of round, square and hexagon bar and plate per metre and per piece.
Free to use, no sign-up. See all our engineering tools.
Incoloy enquiry?
Send us your drawing or specification
Tell us the grade, sizes, quantity and documentation you need and we will come back to you quickly.