Hastelloy C22 Fasteners

Hastelloy C22 fasteners are made from nickel-chromium-molybdenum tungsten alloy UNS N06022. C22 has about 22% chromium and 13% molybdenum, which gives it resistance to oxidising and reducing chemical environments. It holds up against pitting, crevice corrosion, and stress corrosion cracking. Low carbon content (max 0.010%) prevents sensitisation in welded joints. These fasteners are used in chemical processing, pharmaceutical plants, flue gas systems, offshore equipment, and waste treatment, wherever aggressive media puts standard alloys out of service fast.

Approx Price Range

The approx price of Hastelloy C22 fasteners per kg and the factors that affect their rates are explained below.

Price Per Unit/ kg

Hastelloy C22 fasteners are priced at approximately ₹1,000–₹1,750/kg range. Pricing by piece is common for smaller orders. Ask your supplier for both unit and per-kg rates.

Factors Affecting Price

The final price of Hastelloy C22 fasteners varies with the market rates of nickel and molybdenum, order volume, type of fastener, certification needs, surface finish, and lead time.

Types of Hastelloy C22 Fasteners

Hastelloy C22 fasteners come in a wide range of types. Each serves a specific joint design, load condition, or installation requirement.

Bolts
Nuts

Studs

Screws

Washers

Specifications of UNS N06022 Fasteners

The table below covers the key specification parameters for Hastelloy C22 fasteners as per international standards.

Parameter	Details
Standard	ASTM B574 / ASME SB574
Bolt / Screw Size Range	M3 – M56 / 3/16" – 2" (CNC machined up to M100 / 4")
Nut Size Range	M3 – M56 / 3/16" – 2" / custom
Washer Size Range	M3 – M56 / #4 – 3"
Machine Screw Size Range	M1.6 – M12
Length Range	3 mm – 200 mm (up to 1500 mm for CNC machined)
Manufacturing Process	Cold forging (M2–M24), Hot forging (M24–M100), CNC machining
Finish	Plain, Zinc, Nickel plated, Black oxide, PTFE, Geomet, Dacromet

Chemical Properties of Hastelloy C22 Fasteners

The composition below confirms C22's low carbon content and high molybdenum-tungsten balance, the main reason for its broad corrosion resistance.

Element	Composition (%)
Nickel (Ni)	Balance
Chromium (Cr)	20.0 – 22.5
Molybdenum (Mo)	12.5 – 14.5
Tungsten (W)	2.5 – 3.5
Iron (Fe)	2.0 – 6.0
Cobalt (Co)	Max 2.5
Carbon (C)	Max 0.010
Silicon (Si)	Max 0.08
Manganese (Mn)	Max 0.50
Phosphorus (P)	Max 0.02
Sulfur (S)	Max 0.02
Vanadium (V)	Max 0.35

Mechanical Properties of Hastelloy C22 Fasteners

These mechanical values apply to ASTM B574 UNS N06022 bar stock used to produce fasteners.

Property	Value
Tensile Strength	690 MPa (100,000 psi) min
Yield Strength (0.2% offset)	310 MPa (45,000 psi) min
Elongation	45% min
Hardness	Max 100 HRB

Physical Properties of Hastelloy C22 Fasteners

The physical properties below help engineers assess thermal performance and material behaviour under service conditions.

Property	Value
Density	8.69 g/cm³
Melting Range	1325 – 1399°C (2417 – 2550°F)
Specific Heat	414 J/kg·°C
Thermal Conductivity	10.1 W/m·K (at 100°C)
Electrical Resistivity	1.25 µΩ·m
Modulus of Elasticity	205 GPa

Dimension Chart of ASTM B574 UNS N06022 Fasteners

The dimension chart below covers standard sizes for the most commonly supplied Hastelloy C22 fastener types, as per DIN and ASME standards.

Fastener Type	Size Range (Metric)	Size Range (Inch)	Length Range
Hex Bolt	M3 – M56	3/16" – 2"	3 mm – 200 mm
Heavy Hex Bolt	M10 – M100	3/8" – 4"	25 mm – 1100 mm
Stud Bolt (ASME B16.5)	M10 – M100	3/8" – 4"	As per the flange class
Fully Threaded Stud	M3 – M56	3/16" – 2"	3 mm – 1500 mm
Hex Nut	M3 – M56	3/16" – 2"	Standard / Heavy
Coupling Nut	M6 – M36	1/4" – 1-1/2"	As required
Socket Head Cap Screw	M1.6 – M36	—	5 mm – 200 mm
Machine Screw	M1.6 – M12	—	3 mm – 100 mm
Flat Washer	M3 – M56	#4 – 3"	—

Size Chart of Hastelloy C22 Fasteners

The size chart below lists standard hex bolt dimensions per ASME B18.2.1 and DIN 931/933 for Hastelloy C22 hex bolts.

Bolt Size	Across Flats (mm)	Head Height (mm)	Thread Length (mm)	Pitch – Coarse (mm)
M6	10	4.0	18	1.0
M8	13	5.5	22	1.25
M10	17	6.4	26	1.5
M12	19	7.5	30	1.75
M16	24	10.0	38	2.0
M20	30	12.5	46	2.5
M24	36	15.0	54	3.0
M27	41	17.0	60	3.0
M30	46	18.7	66	3.5
M36	55	22.5	78	4.0
M42	65	26.0	90	4.5
M48	75	30.0	102	5.0
M56	85	35.0	118	5.5

*Custom sizes available up to M100 / 4" via CNC machining.

Torque Charts of Hastelloy C22 Fasteners

The torque values below apply to Hastelloy C22 fasteners under controlled assembly conditions. Always verify torque values against your specific joint design and bolt grade.

Nominal Diameter (in)	Threads/in	Torque ft-lb (Lubricated)	Torque ft-lb (Dry)
1/2	13	30.1	40.2
20	33.9	45.3
1-1/2	6	779	1039
12	876	1169
1/4	20	3.4	4.5
28	3.8	5.2
24	7.7	10.3
3/8	16	12.4	16.5
24	14.0	18.6
7/16	14	19.8	26.3
20	22.1	29.4
9/16	12	43.5	57.9
18	48.5	64.6
5/8	11	60.0	79.9
18	67.9	90.5
3/4	10	107	142
16	119	158
16	119	158
7/8	9	172	228
14	189	252
14	289	385
12	495	661

Key Features of UNS N06022 Fasteners

Hastelloy C22 fasteners are known for their ability to perform in mixed and aggressive chemical environments. Here’s why they are the preferred choice.

Dual-environment corrosion resistance

Low carbon content

High Mo and W content

Stress corrosion cracking resistance

Wide temperature range

Good weldability

Long service life

Applications of Hastelloy C22 Fasteners

The high corrosion resistance of C22 makes it a reliable choice across several demanding industries.

Chemical Processing
Pharmaceutical and Food Grade Equipment

Flue Gas Desulfurization (FGD)

Offshore Oil and Gas

Pulp and Paper

Waste Treatment and Incineration

Nuclear and Power Generation

How to Choose the Right Hastelloy C22 Fasteners Supplier?

Keep the following things in mind when choosing a reliable Hastelloy C22 fastener supplier.

Criteria For Supplier Selection

Start with the stock range. A dependable supplier has a stock of Hastelloy C22 in various types and sizes, such as stud bolts, hex bolts, nuts, and washers. They should also be able to source or machine custom sizes without long delays. Check their export track record; C22 is a speciality alloy, and not every stockist handles it regularly.

Technical Considerations

Request material test certificates (MTCs) that confirm chemical and mechanical properties per ASTM B574 / ASME SB574. For flanged joints, confirm that stud bolt lengths and thread forms match your flange class per ASME B16.5. If sour gas is part of your service, request NACE MR0175 documentation. Check hardness values. C22 fasteners should not exceed 100 HRB in finished form.

Quality & Certification Check

Look for EN 10204 / 3.1 MTCs with heat number traceability back to the mill. Evidence of a reliable vendor includes third-party inspection reports, PMI (positive material identification) test results, and 100% radiography test reports for critical bolting. ISO 9001 certification is a baseline. For oil and gas or nuclear projects, also check for PED compliance documentation.

Procurement Tips for Bulk Orders

Hastelloy prices track LME nickel closely; check rates early on long projects. Blanket purchase orders for recurring purchases help reduce per-unit cost and lock in lead times. Always ask for samples before you order a whole batch. Get a written delivery commitment with specific timelines, not just an estimated lead time. If you need fasteners quickly, ask if the supplier has finished fasteners in stock.