Hastelloy C-276 Cross Four-Way Connector For Piping Systems

Hastelloy C-276 Cross Four-Way Connector For Piping Systems

Hastelloy C-276 Cross is a four-way pipe connector manufactured from Hastelloy C-276 superalloy primarily used in piping systems to achieve four-way diversion or confluence of media (usually a "cross-shaped" structure). Its performance and depth of application combine the characteristics of Hastelloy C-276 alloy with the functional requirements of four-way pipe fittings:

1. Core material characteristics and support for the function of the four-way link
Hastelloy C-276 is a nickel-molybdenum-chromium superalloy (typical composition: Ni≈57%, Mo≈16%, Cr≈15.5%, Fe≈5%, W≈4%, C≤0.01%), and its characteristics directly determine the applicable scenarios of the cross-link:
(1) Super corrosion resistance
▶ It is suitable for both oxidizing and reducing media: it can withstand the corrosion of wet chlorine, hypochlorite, chloride (containing high concentration of Cl⁻), sulfuric acid (less than 90%), hydrofluoric acid (HF), organic acid (such as formic acid, acetic acid) and mixed acids (such as H₂SO₄+HF), especially in high-temperature corrosion environments above 60°C, far exceeding 316 stainless steel, duplex steel (2205), etc.
▶ Outstanding resistance to local corrosion: pitting corrosion resistance (PREN≈70, much higher than 316), crevice corrosion (avoiding corrosion caused by sealing gaps at cross-way interfaces) and intergranular corrosion (low-carbon design + tungsten element inhibits carbide precipitation).
(2) High temperature mechanical stability
Maintain high strength (tensile strength at room temperature ≥895MPa, still ≥690MPa at 538°C) in ≤1000°F (538°C), and can withstand the stress caused by medium pressure fluctuations or thermal expansion and contraction to avoid deformation or cracking.
(3) Good processing and welding performance
It can be forged and machined, and the use of matching wires (such as ERNiCrMo-4) during welding reduces the risk of thermal cracks and ensures the connection strength of the cross-sections (suitable for butt weld or socket weld structures).

2. Applicable working conditions and industry scenarios
The core logic of Hastelloy C-276 crosses is that "media corrosiveness exceeds the tolerance range of conventional alloys", and specific scenarios include:
(1) Chemical acid-alkali treatment
▶ Concentrated nitric acid and hydrofluoric acid mixture pipelines: In the fluorine chemical industry, it is used to connect reactors, condensers and storage tanks to resist strong corrosion of mixed acids (316 stainless steel typically has a lifespan of < 6 months in this environment, and C-276 can be extended to more than 5 years).
▶ Wet chlorine pipeline in chlor-alkali industry: The diversion pipeline between the chlorine gas drying tower and the absorption tower is resistant to the corrosion of hydrochloric acid and hypochlorous acid generated by wet chlorine (Cl₂+H₂O).
(2) Environmental protection and hazardous waste treatment
High-concentration chlorine-containing wastewater pipelines: In the landfill leachate treatment system, the four links connecting the conditioning tank, oxidation tower, and sedimentation tank are resistant to the synergistic corrosion of Cl⁻ (>10,000ppm) and oxidants in wastewater.
(3) Oil and gas exploitation and processing
Acid gas field gathering and transportation pipelines: Four-way pipelines connecting gas wells, separators, and desulfurization devices, which are resistant to corrosion of H₂S (>5%), CO₂ (>10%) and formation water (high Cl⁻), and avoid sulfide stress cracking (SSCC).
(4) Pharmaceutical and food-grade chemicals
Sterile injection production pipeline: Four-way distribution of purified water, water for injection and chemical solution, meeting FDA requirements for material purity (C-276 no heavy metal precipitation), and resisting corrosion from detergents such as citric acid and hydrogen peroxide.

3. Key points of manufacturing process
Due to the high high temperature strength and high tendency of Hastelloy C-276 to work harden, its four-way manufacturing requires strict control of the process:
(1) Forging and forming
The hot forging process (forging temperature 1150~1200°C) is used to avoid cracks caused by cold working, ensure uniform internal structure (grain size control at ASTM 5~8), and improve the anti-corrosion fatigue performance.
(2) Welding process
Before welding, the surface oxide scale needs to be removed (with a stainless steel wire brush or pickling), tungsten argon arc welding (GTAW) is used, ERNiCrMo-4 is used for welding wire, and the temperature between layers is ≤ 150°C to avoid embrittlement caused by the precipitation of harmful phases (such as μ phase) in the heat-affected zone (HAZ).
(3) Heat treatment
After welding, solution treatment (1120~1150°C insulation for 1~2 hours, air cooling) is required to eliminate welding stress and dissolve the dissolved carbide to restore corrosion resistance.

4. Advantages over other materials

DINGSCO

Hunan Dinghan New Material Technology Co., Ltd. (DINGSCO) specialized in Nickel Based Corrosion Resistant and High Temperature alloys products which used in the world’s most technically demanding industries and applications.We are dedicated to providing our customers with best quality products, fastest possible deliveries, most competitive prices of Nickel Based Corrosion Resistant and High Temperature alloys in bars, rods, forged flanges, valve parts (Ball, Stem, Seat Ring, etc), forged shapes (shafts, discs, blocks, hubs, rings, cylinders and other custom shapes) according to ASTM, ASME, API, AMS, NACE and other industry standards.

PROFESSIONAL NICKEL ALLOY MANUFACTURER

• Monel, Incoloy, Inconel, Hastelloy
• VIM, ESR, Forging, Heat treatment, Machining
• Round Bar, Ball, Stem, Ring, Flange, etc
• ISO9001, API-6A, API-20B, PED, NORSOK

CORE VALUE

• QUALITY ASSURANCE
• SCIENCE AND TECHNOLOGY INNOVATION STRATEGY
• COOPERATION

CUSTOMIZED PRODUCTS:

APPLICATION:

Hunan Dinghan New Material Technology Co.,Ltd. (DINGSCO) specialized in Nickel Based Corrosion Resistant and High Temperature alloys products which used in the world’s most technically demanding industries and applications.

We have complete advanced technology facilities to produce best quality alloys to meet exacting your specifications such as VIM (Vacuum lnduction Melting) furnace to provide high purity Alloys,ESR (Electro Slag Re-melting) furnace to enhances the structure and purity of the Alloys, and CNC machining equipments (Lathe, Wire cutting, Drilling,Milling) to provide high precision finished products.

We are dedicated to providing our customers with best quality products,fastest possible deliveries, most competitive prices of Nickel Based Corrosion Resistant and High Temperature alloys in bars,rods,forged flanges, valve parts, forged shapes (shafts, discs, blocks, hubs,rings, cylinders and tailor shapes) according to ASTM,ASME,API,AMS, NACE and other industry standards.

We can help you gain a competitive edge in the market by responding to a rush quote in less than 24 hours and even complex requests for price and delivery quotations are responded to within 48 hours.