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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 | Hastelloy C22 | Hastelloy B2 | Hastelloy B3 |
|---|---|---|---|
| Material Type | Nickel-Molybdenum-Iron-Cobalt Alloy | Nickel-Molybdenum Alloy | Nickel-Molybdenum Alloy |
| Corrosion Resistance | Excellent against oxidizing and reducing environments | Excellent against hydrochloric acid and reducing agents | Excellent in high concentration acids and reducing environments |
| Temperature Range | Up to 1200°F (650°C) | Up to 1000°F (538°C) | Up to 1000°F (538°C) |
| Density | 8.44 g/cm³ | 8.72 g/cm³ | 8.75 g/cm³ |
| Typical Fastener Forms | Bolts, Nuts, Screws, Studs, Washers | Bolts, Nuts, Screws, Studs, Washers | Bolts, Nuts, Screws, Studs, Washers |
| Standards | ASTM B575, ASME SB575, ISO 9001 | ASTM B443, ASME SB443, ISO 9001 | ASTM B574, ASME SB574, ISO 9001 |
| Applications | Chemical, Petrochemical, Marine, Power Plants | Chemical, Acid Handling, Marine, Industrial | Chemical, Acid Processing, Marine, Industrial |
Chemical Composition (Typical ranges for SSC22 B2 B3)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Hastelloy C22 (%) | Hastelloy B2 (%) | Hastelloy B3 (%) |
|---|---|---|---|
| Nickel (Ni) | 56.0 - 63.0 | 62.0 - 68.0 | 61.0 - 67.0 |
| Molybdenum (Mo) | 12.0 - 14.5 | 28.0 - 34.0 | 28.0 - 34.0 |
| Cobalt (Co) | 1.0 - 4.0 | – | – |
| Iron (Fe) | 3.0 - 8.0 | 1.0 - 3.0 | 1.0 - 3.0 |
| Copper (Cu) | ≤ 0.5 | ≤ 0.5 | ≤ 0.5 |
| Carbon (C) | ≤ 0.02 | ≤ 0.02 | ≤ 0.02 |
| Manganese (Mn) | ≤ 1.0 | ≤ 1.0 | ≤ 1.0 |
| Silicon (Si) | ≤ 0.08 | ≤ 0.08 | ≤ 0.08 |
| Sulfur (S) | ≤ 0.015 | ≤ 0.015 | ≤ 0.015 |
| Phosphorus (P) | ≤ 0.03 | ≤ 0.03 | ≤ 0.03 |
Mechanical Properties (Typical)
| Property | Hastelloy C22 | Hastelloy B2 | Hastelloy B3 |
|---|---|---|---|
| Tensile Strength (MPa) | 690 - 930 | 690 - 860 | 690 - 860 |
| Yield Strength (MPa) | 275 - 450 | 275 - 380 | 275 - 380 |
| Elongation (%) | 40 - 60 | 35 - 55 | 35 - 55 |
| Hardness (HRB) | 80 - 95 | 80 - 90 | 80 - 90 |
| Modulus of Elasticity (GPa) | 207 | 205 | 205 |
| Poisson's Ratio | 0.31 | 0.31 | 0.31 |
| Melting Point (°C) | 1390 - 1440 | 1340 - 1380 | 1340 - 1380 |
| Density (g/cm³) | 8.44 | 8.72 | 8.75 |
Equivalent Grades
| Hastelloy Grade | ASTM | ASME | UNS | ISO / EN | Other Common Names |
|---|---|---|---|---|---|
| Hastelloy C22 | B575 | SB575 | N06022 | EN 2.4602 | Alloy C-22 |
| Hastelloy B2 | B443 | SB443 | N10665 | EN 2.4605 | Alloy B-2 |
| Hastelloy B3 | B574 | SB574 | N10675 | EN 2.4606 | Alloy B-3 |
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) | Thread Pitch (mm) | Length (mm) | Head Diameter (mm) | Weight per Piece (g) | Applicable Fastener Type |
|---|---|---|---|---|---|
| M6 | 1.0 | 16 | 10 | 5 | Bolt / Screw |
| M8 | 1.25 | 20 | 13 | 12 | Bolt / Screw |
| M10 | 1.5 | 25 | 16 | 25 | Bolt / Screw |
| M12 | 1.75 | 30 | 18 | 40 | Bolt / Screw |
| M16 | 2.0 | 40 | 24 | 90 | Bolt / Screw |
| M20 | 2.5 | 50 | 30 | 160 | Bolt / Screw |
| M24 | 3.0 | 60 | 36 | 250 | Bolt / Screw |
| M30 | 3.5 | 75 | 46 | 450 | Bolt / Screw |
Common Types Of Fasteners
Bolts
Nuts
Steel Screw
Washer
Stud Bolts
Frequently Asked Questions (FAQ)
What are Hastelloy C22, B2, and B3 fasteners?
Hastelloy C22, B2, and B3 fasteners are high-performance nickel-based alloy fasteners designed for extreme corrosion resistance in chemical, marine, and high-temperature environments. They are commonly used as bolts, nuts, screws, studs, and washers.
What industries use Hastelloy fasteners?
These fasteners are widely used in chemical processing, petrochemical, marine, power generation, pharmaceuticals, and other industrial applications where high corrosion resistance and mechanical strength are required.
What makes Hastelloy C22, B2, B3 resistant to corrosion?
The high content of nickel, molybdenum, and other alloying elements like cobalt (in C22) enhances resistance to pitting, crevice corrosion, and stress corrosion cracking in both oxidizing and reducing environments.
Can Hastelloy fasteners withstand high temperatures?
Yes, Hastelloy C22 can typically withstand temperatures up to 1200°F (650°C), while B2 and B3 grades are suitable up to 1000°F (538°C), making them ideal for high-temperature applications.
What types of Hastelloy fasteners are available?
They are available in a wide range of fasteners, including bolts, screws, nuts, studs, and washers, with various sizes and thread types to suit industrial and custom applications.
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