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Hastelloy C22, B2, and B3 fasteners are high-performance alloy components engineered to withstand the most aggressive chemical and industrial environments. These fasteners are widely used in industries where corrosion resistance and durability are critical.
Hastelloy C22 contains molybdenum, tungsten, and iron, which enhance its corrosion resistance against oxidizing and reducing agents. B2 and B3 grades are nickel-molybdenum alloys, optimized for resistance to hydrochloric acid and other highly corrosive chemicals.
One of the primary advantages of Hastelloy fasteners is their superior resistance to pitting, crevice corrosion, and stress corrosion cracking. This makes them ideal for chemical processing plants, marine applications, and other harsh environments.
Hastelloy C22, B2, and B3 fasteners maintain mechanical strength and structural integrity at elevated temperatures. This capability ensures safe and reliable performance in heat exchangers, furnaces, and reactors.
These fasteners are extensively used in chemical processing, petrochemical, marine, power generation, and pharmaceutical industries. Their resistance to harsh chemicals allows them to perform reliably where standard stainless steel fasteners would fail.
Hastelloy fasteners are available in various forms including bolts, nuts, screws, studs, and washers. They come in multiple sizes and thread types to suit both standard and custom industrial applications.
Hastelloy fasteners offer excellent tensile strength, hardness, and elongation properties. This ensures that components can withstand mechanical stress and vibration without deformation or failure.
Hastelloy C22, B2, and B3 fasteners are manufactured according to international standards such as ASTM, ASME, and ISO. Each fastener undergoes rigorous quality checks to ensure consistency, durability, and resistance to corrosion.
Specification Table
| Property | Specification / Standard | Details |
|---|---|---|
| Material Grade | ASTM B574 / UNS N10276 | Nickel-Molybdenum-Chromium alloy with excellent corrosion resistance |
| Fastener Types | Bolts, Nuts, Screws, Studs | Available in various sizes and thread types |
| Dimensions | ASME B18.2.1 / ISO 898-1 | Custom and standard sizes available |
| Mechanical Strength | ASTM B574 | High tensile and yield strength suitable for industrial applications |
| Corrosion Resistance | Excellent | Resistant to oxidizing and reducing media, seawater, and chemical environments |
| Temperature Range | -60°C to 190°C | Maintains mechanical properties across wide temperature range |
| Surface Finish | Mill Finish / Polished | Optional coating or passivation available |
| Applications | Chemical, Petrochemical, Marine, Industrial | Used where corrosion and high temperature resistance is required |
Chemical Composition (Typical ranges for SSC276)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Composition (wt%) | Notes |
|---|---|---|
| Nickel (Ni) | 57 min | Base element providing corrosion resistance |
| Molybdenum (Mo) | 15–17 | Enhances resistance to pitting and crevice corrosion |
| Chromium (Cr) | 15.5–16.5 | Improves general corrosion resistance |
| Iron (Fe) | 4 max | Minor alloying element |
| Cobalt (Co) | 2 max | Optional minor element for stability |
| Manganese (Mn) | 1 max | Trace amounts to improve mechanical properties |
| Silicon (Si) | 0.08 max | Deoxidizer element |
| Carbon (C) | 0.01–0.03 | Low carbon for corrosion resistance |
| Phosphorus (P) | 0.04 max | Impurity control |
| Sulfur (S) | 0.03 max | Impurity control |
Mechanical Properties (Typical)
| Property | Value / Standard | Notes |
|---|---|---|
| Tensile Strength (Rm) | 515–758 MPa (75–110 ksi) | Depends on heat treatment and product form |
| Yield Strength (Rp 0.2) | 205–310 MPa (30–45 ksi) | 0.2% offset yield strength |
| Elongation (A5) | 40–50% | Measured in 50 mm gauge length |
| Hardness (HRB) | 70 max | Typical Brinell / Rockwell hardness values |
| Impact Strength | Not specified | Depends on manufacturing and heat treatment |
| Operating Temperature | -60°C to 190°C | Maintains mechanical properties over this range |
| Corrosion Resistance | Excellent | Resistant to oxidizing and reducing chemicals, acids, and seawater |
Equivalent Grades
| Standard / Organization | Equivalent Grade | Notes |
|---|---|---|
| UNS | N10276 | Unified Numbering System designation |
| ASTM | B574 | Standard specification for nickel-chromium-molybdenum alloy fasteners |
| EN / European | 2.4819 | European designation for C276 alloy |
| DIN / German | NiMo16Cr15W | German equivalent designation for C276 |
| JIS / Japanese | Hastelloy C276 | Japanese Industrial Standard matches UNS N10276 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Size (mm / inch) | Thread Pitch | Length (mm) | Weight per Piece (kg) | Standard |
|---|---|---|---|---|
| M6 / 1/4" | 1.0 / 20 TPI | 16–100 | 0.012–0.045 | ASTM B574 |
| M8 / 5/16" | 1.25 / 18 TPI | 20–120 | 0.025–0.080 | ASTM B574 |
| M10 / 3/8" | 1.5 / 16 TPI | 25–150 | 0.045–0.150 | ASTM B574 |
| M12 / 1/2" | 1.75 / 13 TPI | 30–200 | 0.080–0.300 | ASTM B574 |
| M16 / 5/8" | 2.0 / 11 TPI | 40–250 | 0.150–0.600 | ASTM B574 |
| M20 / 3/4" | 2.5 / 10 TPI | 50–300 | 0.300–1.20 | ASTM B574 |
| M24 / 1" | 3.0 / 8 TPI | 60–350 | 0.500–2.0 | ASTM B574 |
Common Types Of Fasteners
Bolts
Nuts
Steel Screw
Washer
Stud Bolts
Frequently Asked Questions (FAQ)
What is Hastelloy C276 Fastener?
Hastelloy C276 Fasteners are high-performance nickel-molybdenum-chromium alloy fasteners designed for exceptional corrosion resistance in harsh chemical, marine, and industrial environments.
What types of Hastelloy C276 Fasteners are available?
These fasteners are available as bolts, nuts, screws, studs, and custom-made sizes, suitable for a wide range of industrial applications.
What are the key features of Hastelloy C276 Fasteners?
Key features include excellent corrosion resistance, high strength, durability, ability to withstand high temperatures, and suitability for aggressive chemical environments.
Which industries use Hastelloy C276 Fasteners?
They are widely used in chemical processing, petrochemical, marine, pharmaceuticals, pulp & paper, and other industrial sectors that require corrosion-resistant fasteners.
What standards do Hastelloy C276 Fasteners comply with?
These fasteners typically comply with ASTM B574, UNS N10276, and other international standards, ensuring consistent quality and performance.
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