Hastelloy Pipe Fittings
Hastelloy pipe fittings are specially engineered nickel-based high-temperature alloy components designed to withstand corrosive chemical environments where фитинги из нержавеющей стали fail.Primarily composed of molybdenum and chromium,they offer exceptional corrosion resistance,high-temperature performance, and durability.
Основные характеристики
- Extreme Corrosion Resistance:
They offer exceptional protection against strong oxidizers (like nitric acid),reducing agents (like hydrochloric and sulfuric acids),and seawater. - Высокотемпературная стабильность:
These fittings maintain their mechanical strength and resist oxidation at temperatures up to 1900°F (1037°C),depending on the specific grade. - Resistance to Localized Attack:
Their unique chemistry (high nickel,molybdenum,and chromium) prevents pitting,crevice corrosion,and stress corrosion cracking. - Свариваемость:
Most grades are designed with low carbon content to minimize carbide precipitation during welding, ensuring the joints remain as corrosion-resistant as the pipe itself.
Общие оценки
- Hastelloy C276 (UNS N10276)
- Hastelloy C22 (UNS N06022)
- Hastelloy C2000 (UNS N06200)
- Hastelloy C4 (UNS N06455)
- Hastelloy B2 (UNS N10665)
- Hastelloy B3 (UNS N10675)
- Hastelloy X (UNS N06002)
- Hastelloy G30 (UNS N06030)
- Hastelloy G35 (UNS N06035)
Core Technical Specifications for Hastelloy Pipe Fittings
Hastelloy pipe fittings are governed by specific international standards that define their dimensions,material composition, and mechanical properties.Core technical specifications revolve around the following aspects:Forged pipe fittings shall comply with ASTM B36.6,while forged components shall meet ASTM B564 standards.
Manufacturing Standards for Hastelloy Pipe Fittings
Hastelloy pipe fittings are manufactured according to standard dimensions to ensure compatibility with global piping systems:
- Forged Butt-weld Pipe Fittings:
ASTM B366 / ASME SB366 (materials) and ASME B16.9 / MSS SP-43 (dimensions). - Forged Pipe Fittings:
ASTM B564 / ASME SB564 (materials) and ASME B16.11 (dimensions for socket weld and threaded connections).
Dimensional and Size Range
- Seamless Pipe Fittings:Typically available in sizes from 1/2“ to 10” NB.
- Welded/Fabricated Pipe Fittings:Available in sizes from 1/2“ to 48” NB.
- Wall Thickness:Specifications include Sch 5S,10S,40S,80S,160,and XXS.
- Bend Radius:Standard options include 1D (short radius),1.5D (long radius),3D,and 5D.
- For other specifications,please связаться с нами for ordering.
Hastelloy Pipe Fittings Testing
To ensure integrity in corrosive environments,Kaysuns pipe fittings undergo hydrostatic testing to verify leak-tightness under pressure;PMI testing confirms alloy chemical composition compliance with ASTM/ASME standards.Fittings for acidic oil and gas environments must meet NACE MR0175 compliance.For high-criticality welded fittings,100% X-ray inspection is standard practice.
Introduction to Common Grades of Hastelloy Pipe Fittings
Common Grades & Chemical Composition (%)
| Оценка | Ni | Cr | Пн | Fe | W | Другие |
|---|---|---|---|---|---|---|
| C276 | 57.0 (Bal) | 14.5 – 16.5 | 15.0 – 17.0 | 4.0 – 7.0 | 3.0 – 4.5 | Co 2.5, V 0.35 |
| C22 | 56.0 (Bal) | 20.0 – 22.5 | 12.5 – 14.5 | 2.0 – 6.0 | 2,5 – 3,5 | Co 2.5, V 0.35 |
| Би 2 | 65.0 (Min) | 1.0 (Max) | 26.0 – 30.0 | 2.0 (Max) | – | Mn 1.0, Co 1.0 |
Material Grades & Mechanical Properties
Technical performance varies by alloy grade,with C276 being the most common.
| Имущество | Хастеллой C276 | Хастеллой C22 | Хастеллой B2 |
|---|---|---|---|
| Плотность | 8.89 g/cm³ | 8.69 g/cm³ | 9.2 g/cm³ |
| Melting Point | 1370°C (2500°F) | 1399°C (2550°F) | 1370°C (2500°F) |
| Предел прочности | 790 MPa (115 ksi) | 690 MPa (100 ksi) | 760 MPa (110 ksi) |
| Предел текучести | 355 MPa (52 ksi) | 310 MPa (45 ksi) | 350 MPa (51 ksi) |
| Удлинение | 40% | 45% | 40% |
Hastelloy C276 - The “All-Purpose” Corrosion-Resistant Alloy
- Core Characteristics:
Contains high molybdenum (16%) and tungsten (4%) content,providing exceptional resistance in both oxidizing and reducing environments.It exhibits outstanding corrosion resistance against wet chlorine gas,hypochlorite solutions,and chlorine dioxide. - Technical Advantages: Extremely low carbon content minimizes carbide precipitation during welding,allowing pipe fittings to be used directly in the as-welded condition without requiring additional heat treatment.
- Typical Applications:
Flue gas desulfurization (FGD) systems,chemical processing (e.g., chloride production),pulp and paper industry,sour gas extraction.
As the industry-recognized “universal alloy,” Hastelloy C276 (UNS N10276) pipe fittings are the preferred choice for handling wet chlorine gas,hypochlorite,and chlorine dioxide environments.Its unique tungsten content delivers exceptional resistance to pitting and stress corrosion cracking.Whether in flue gas desulfurization (FGD) or complex sour natural gas extraction,C276 fittings provide an impenetrable safety barrier for your piping systems with their outstanding post-weld corrosion resistance.
Hastelloy C22 - The Enhanced Expert for Oxidizing Environments
- Core Characteristics:
Chromium content increased to 22%,delivering significantly superior performance compared to C276 in strongly oxidizing media such as nitric acid and mixed acids containing oxidizing salts.It also exhibits more balanced resistance to pitting and crevice corrosion. - Technical Advantages:In complex mixed chemical fluids,C22 provides a broader “safe zone” than C276,making it the preferred solution for tackling intricate corrosion challenges.
- Typical Applications:Pharmaceutical industry reactors (preventing metal ion contamination),waste treatment systems,pesticide production,and highly oxidizing acid circulation systems.
When dealing with complex media characterized by alternating strong oxidizing and reducing conditions,Hastelloy C22 (UNS N06022) pipe fittings offer a superior upgrade over C276.With its elevated chromium content,C22 provides broader passivation protection in nitric acid,mixed acids,and highly oxidizing salt environments.In pharmaceutical and fine chemical applications demanding stringent metal ion contamination control,C22 fittings ensure high-purity production processes through exceptional chemical stability and surface finish.
Hastelloy B2 - The Nemesis of “Reductive Acids”
- Core Characteristics:
Its primary components are nickel and molybdenum (28%).It is one of the optimal materials for handling hydrochloric acid (HCl) across various concentrations and temperatures,while also resisting reducing acids such as sulfuric acid and phosphoric acid. - Key Limitations:Not suitable for oxidative environments.B2 piping components will rapidly fail if the medium contains iron salts,copper salts,or other oxidizing impurities.
- Typical Applications:Hydrochloric acid production and recovery units,acetic acid production (reduction stage),alkylation reaction systems.
Примечание:
Many projects are now gradually replacing B2 with B3 (N10675) due to B3’s superior thermal stability and easier machinability.
For highly corrosive environments involving concentrated hydrochloric,sulfuric,and phosphoric acids,Hastelloy B2 (UNS N10665) and B3 pipe fittings demonstrate unparalleled expertise.With a molybdenum content as high as 28%,these materials achieve near “maintenance-free” performance against most reducing chemicals.Our manufacturing process strictly controls iron and chromium content,ensuring the fittings maintain exceptional mechanical properties even in the heat-affected zone.They serve as core components in alkylation units and acetic acid production systems.
Core Comparison Table
| Особенности | C276 | C22 | Би 2 |
|---|---|---|---|
| Major Resistance | General-purpose Corrosion Resistance | Strongly Oxidizing Environment | Reducing Acid |
| Содержание хрома | Medium (16%) | High (22%) | Extremely Low (<1%) |
| Pitting Corrosion Resistance | Extremely Strong | Comprehensive | Weak |
| Свариваемость | Превосходно | Превосходно | Strict Control of Heat Input |
Why Choose Our Hastelloy Pipe Fittings?
- Full Material Traceability:
Each batch includes original factory MTC (Material Test Certificate),compliant with EN 10204 3.1 standards. - Precision Manufacturing:
Supports seamless and welded pipes from 1/2“ to 48” in various sizes,with wall thicknesses ranging from Sch 5s to XXS. - Rigorous Inspection:100% undergoes PMI (spectral analysis),RT (radiographic testing),and hydrostatic pressure testing to ensure zero-defect delivery.
- Expert Consultation:With over 15 years of high-nickel alloy application experience,we provide technical support from material selection to welding solutions.
In demanding industrial fluid systems,ordinary steel often struggles to withstand the corrosive effects of strong acids and high temperatures.Our Hastelloy pipe fittings strictly adhere to ASTM B366 and ASME SB366 standards,specifically engineered for chemical,pharmaceutical,and energy industries.Featuring an optimal nickel-molybdenum-chromium composition,these fittings deliver exceptional corrosion resistance while ensuring long-term structural integrity.This significantly reduces maintenance costs and minimizes the risk of unplanned downtime for businesses.
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- RM901 No.22 Tangjiaqiao Road Wenzhou Китай
- +86 577 8551 1171
- [email protected]
- https://www.kaysuns.com/
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