HASTELLOY C276 (UNS N10276)
There are 57.0 Ni, 16.0 Mo, 15.5 Cr, 5.5 Fe, and 3.8 W in this alloy
This grade of HASTELLOY C276 is available from High Performance Alloys in a variety of forms: bar, hex bar, square bar, wire spool, wire cuts, loose coil, sheet, plate, coil, tube, pipe, nipple, elbow, fitting, coupling, flange, fasteners, forging, disk, machined. Request a quote for this grade.
Overview
This nickel-chromium-molybdenum wrought alloy is considered the most corrosion resistant alloy available. As welded, this alloy is resistant to grain boundary precipitation in the weld heat-affected zone, alloy 20 vs hastelloy so it can be used for most chemical process applications. Also, alloy C-276 resists pitting, stress-corrosion cracking, and oxidizing atmospheres up to 1900°F with excellent resistance. Several chemical environments are resistant to alloy C-276.
Characteristics
- A few alloys are resistant to wet chloride gas, hypochlorite, and chlorine dioxide solutions, such as HASTELLOY C276.
- Unlike other metals alloy 20 vs 316 stainless steel, Hastalloy C276 is extremely resistant to oxidizing salt solutions, such as ferric chloride and cupric chloride.
- In the as welded condition, Hastelloy C276 does not precipitate grain boundaries, making it a suitable material for many chemical processes
Applications
- In the paper industry, digesters and bleach plants are used.
- The components exposed to sour gas.
- Desulfurization equipment for flue gases.
- In sulfuric acid environments, evaporators, heat exchangers, filters and mixers are used.
- Reactors for sulfuric acid.
- Equipment for the production of organic chlorides.
- Process equipment that uses halide or acid catalysts.
In addition to chemical and petrochemical organic chloride processes, HASTELLOY C276 is typically used for equipment components in halide and acid reactions. Pulp and paper (digesters and bleach areas), scrubbers and ducting for flue gas desulfurization, pharmaceutical and food processing equipment are also used.
The nickel-chromium-molybdenum alloy Hasteroloy C-276, hastelloy c22 vs c276 is a corrosion-resistant alloy unmatched by any other. Among its outstanding properties are its resistance to ferric and cupric chlorides, hot contaminated mineral acids, solvents, chlorine, chlorine contaminated (organic and inorganic), dry chlorine, formic and acetic acids, acetic anhydride, seawater and brine solutions, hypochlorite, and chlorine dioxide solutions, among others. Besides its resistance to grain boundary precipitates in the weld heat affected zone, alloy C276 is also highly resistant to pitting and stress corrosion cracking.
The average Olsen cup depth of Hastalloy C276 sheet when heat-treated at 2050°F, rapid quenched, is 0.48". Alloy C-276 can be successfully fabricated in many ways. Despite its tendency to harden, the alloy is easily formed both hot and cold with the right care. Welding, machining, and forming information is available.
Machinability Ratings
In terms of corrosion, temperature and wear resistance, nickel & cobalt base alloys, such as HASTELLOY C276, are rated as moderate to difficult to machine, however, conventional production methods can be used to machine these alloys successfully. During machining, these alloys work harden rapidly, generate high levels of heat during cutting, weld to the cutting tool surface and offer high resistance to metal removal due to their high shear strength.
During machining operations, it is important to consider the following points:
In order to maximize capacity, it is best to make the machine rigid and overpowered.
Maintain rigidity when holding the tool and the workpiece. Minimize tool overhang.
Keep tools sharp at all times. Change sharpened tools at regular intervals rather than when necessary. A dull tool is one with a wear land of 0.015 inches.
Most machining operations should be performed with positive rake angles. Negative rake angles should be considered for intermittent cuts and heavy stock removal. Carbide-tipped tools are recommended for most applications. For intermittent cuts, high speed tools are often recommended, but with lower production rates.
POSITIVE CUTS - Maintain positive cutting action by using heavy, constant feeds. When feeds slow down and the tool dwells in the cut, work hardening occurs, tool life decreases, and tight tolerances are impossible to achieve.
There are a number of machining parameters presented in Tables 16 and 17. A general recommendation on plasma cutting is presented in Table 18. It is recommended to use soluble oils when using carbide tooling.
ALLOY 20 STAINLESS STEEL
In addition to Alloy 20 (UNS N08020) sheet, sheet coil, plate, round bar, processed flat bar, and tubular products, Penn Stainless now carries Alloy 20 (UNS N08020) tubing.
OVERVIEW
GENERAL PROPERTIES
Alloy 20 (UNS N08020) is an austenitic, nickel-iron-chromium super alloy based with copper and molybdenum additions that provide resistance to hostile environments, pitting, and crevice corrosion. Columbium stabilizes Alloy 20 during welding to reduce carbide precipitation. Due to its characteristics, hastelloy c276 equivalent material, hastelloy c276 chemical composition Alloy 20 appears to fall between stainless and nickel. This alloy was designed to resist acid attack to the maximum extent possible, and it has excellent corrosion resistance to sulfuric acid and chloride stress corrosion cracking in boiling 20% to 40% sulfuric acid, and also excellent corrosion resistance in general to sulfuric acid and chloride stress corrosion cracking. At ambient and elevated temperatures, alloy 20 has good mechanical properties, up to approximately
By using usual industrial processes, it can be easily manufactured at a temperature of 930°F (500°C).
Specifications: UNS N08020
REQUIREMENTS:
Although Alloy 20 was originally developed for sulfuric acid applications, it is now widely used in a wide variety of industries. Common applications for Alloy 20 include:
The chemical and allied industries
Production of food and dyes
The heat exchanger
Inflammable materials
Isotopes
Flow control valves
Griddle racks for pickling
Plastics and synthetic rubber manufacturing
Pharmaceutics
Scrubbers for SO2 and other severe environments
SPECIFICATIONS:
UNS N08020 is an ASTM/ASME standard
The EURONORM is FeMi35Cr20Cu4Mo2
The DIN number is 2.4660
The resistance
CORROSION RESISTANCE:
It is resistant to general corrosion, pitting, and crevice corrosion in chemicals containing chlorides, sulfuric, phosphoric, and nitric acids.
As a result of nickel content, corrosion resistance and chloride ion resistance are enhanced.
The addition of copper and molybdenum ensures resistance to hostile environments, pitting, and corrosion in crevices.
Its resistance to oxidizing environments, such as nitric acid, is enhanced by the presence of chrome.
The effects of carbide precipitation are reduced by columbium.
PROCESSING
WELDABILITY:
With the exception of oxyacetylene, all commonly used welding methods can be used successfully.
Most of the time, the material may be used in the as-welded condition due to the presence of Columbium in the heat-affected zone.
It is not necessary to pre-heat.
HEAT TREATMENT:
Heat cannot harden this material.
The stabilized-annealing process is carried out at 1750-1850°F, followed by a water quench.
It is possible to relieve stress on annealed material up to 950°F.
PROCESSING – HOT FORMING:
The stock should be heated uniformly to a starting temperature of 2100-2225°F. The forging should be completed before the temperature falls below 1800°F.
After hot working operations, reheat the material at 1750-1850°F for a minimum of 1/2 hour per inch of thickness and water quench it.
THE COLD FORMING PROCESS:
During the fabrication of fabricated items, alloy 20 is readily bendable, drawn and pressed, as well as other forming operations.
A radius twice the material's thickness can usually be bent by press braking alloy 20.
The final stabilization annealing is often necessary after cold reductions of more than 15%.
MACHINABILITY:
Because Alloy 20's work-hardening rate is high, these requirements must be met:
When compared with low-alloy standard austenitic stainless steel, only low cutting speeds can be achieved.
Keeping tools engaged at all times is essential.
A heavy feed is essential to getting below the 'skin' of work-hardened muscles.
