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Hastelloy C276 is a nickel-molybdenum-chromium super alloy with an addition of tungsten designed to have excellent corrosion resistance in a wide range of severe environments. The high nickel and molybdenum contents make the nickel steel alloy especially resistant to pitting and crevice corrosion in reducing environments while chromium conveys resistance to oxidizing media. The low carbon content minimizes carbide precipitation during welding to maintain corrosion resistance in as-welded structures. This nickel alloy is resistant to the formation of grain boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process application in an as welded condition.
Although there are several variations of the Hastelloy nickel alloy, Hastelloy C-276 is by far the most widely used.
Alloy C-276 is widely used in the most severe environments such as chemical processing, pollution control,pulp and paper production, industrial and municipal waste treatment, and recovery of sour natural gas.
Characteristics
HASTELLOY C276 is one of the few alloys resistant to wet chloride gas, hypochlorite and chlorine dioxide solutions.
HASTELLOY C276 has exceptional resistance to strong solutions of oxidizing salts, such as ferric and cupric chlorides.
HASTELLOY C276 is not prone to grain boundary precipitation in the as welded condition and therefore suitable for many chemical process applications
Applications
Digesters and bleach plants in the paper industry.
Components exposed to sour gas.
Equipment for flue-gas desulfurisation plants.
Evaporators, heat exchangers, filters and mixers used in sulfuric acid environments.
Sulfuric acid reactors.
Organic chloride process equipment.
Equipment for processes utilizing halide or acid catalysts.
Some typical applications of HASTELLOY C276 include equipment components in chemical and petrochemical organic chloride processes and processes utilizing halide or acid catalysts. Other industry applications are pulp and paper (digesters and bleach areas), scrubbers and ducting for flue gas desulfurization, pharmaceutical and food processing equipment.
HASTELLOY C-276 is a nickel-chromium-molybdenum alloy with universal corrosion resistance unmatched by any other alloy. It has outstanding resistance to a wide variety of chemical process environments including ferric and cupric chlorides, hot contaminated mineral acids, solvents, chlorine and chlorine contaminated (both organic and inorganic), dry chlorine, formic and acetic acids, acetic anhydride, sea water and brine solutions and hypochlorite and chlorine dioxide solutions. Alloy C276 also resists formation of grain boundary precipitates in the weld heat affected zone making it useful for most chemical processes in the as-welded condition. It has excellent resistance to pitting and stress corrosion cracking.
HASTELLOY C276 sheet 0.044" thick in the heat-treated condition at 2050°F, rapid quenched, has an average olsen cup depth of 0.48". Alloy C-276 can be successfully fabricated by many methods. The alloy tends to work harden but with the proper care, the alloy is readily hot and cold formed. Complete information on welding, machining and forming is available
Chemical Requirements
Ni
Cr
Mn
Mo
C
Si
Fe
Max %
Bal.
16.5
1.0
17.0
0.010
0.08
7.0
Min %
14.5
15.0
4.0
Mechanical Property Requirements
Ultimate Tensile
Yield Strength (0.2% OS)
Elong. in 2 in. (50.8mm) or 4D min,%
R/A
Hardness
Min
100 KSi
41 KSi
40
Max
Min (Metric)
690 MPa
283 MPa
Max
Chart of Average Tensile Data At Temperatures
Specifications
Form
Standard
UNS
UNS N10276
Bar
ASTM B574 Din 17752
Wire
Sheet
ASTM B575 Din 17750
Plate
ASTM B575 Din 17750
Fitting
ASTM B366
Forging
ASTM B564
Tube
ASTM B619 ASTM B622 ASTM B626 Din 17751
Pipe
ASTM B619 ASTM B622 ASTM B626 Din 17751
Weld Wire
A5.14 ERNiCrMo-4
Weld Electrode
A5.11 ENiCrMo-4
Din.
2.4819 All Forms
Table 16
RECOMMENDED TOOL TYPES AND MACHINING CONDITIONS
Operations
Carbide Tools
Roughing, with severe interruption
Turning or Facing C-2 and C-3 grade: Negative rake square insert, 45 degree SCEA1, 1/32 in. nose radius. Tool holder: 5 degree neg. back rake, 5 degree neg. side rake. Speed: 30-50 sfm, 0.004-0.008 in. feed, 0.150 in depth of cut. Dry2, oil3, or water-base coolant4.
Normal roughing
Turning or Facing C-2 or C-3 grade: Negative rate square insert, 45 degree SCEA, 1/32 in nose radius. Tool holder: 5 degree neg. back rake, 5 degree neg. side rake. Speed: 90 sfm depending on rigidity of set up, 0.010 in. feed, 0.150 in. depth of cut. Dry, oil, or water-base coolant.
Finishing
Turning or Facing C-2 or C-3 grade: Positive rake square insert, if possible, 45 degree SCEA, 1/32 in. nose radius. Tool holder: 5 degree pos. back rake, 5 degree pos. side rake. Speed: 95-110 sfm, 0.005-0.007 in. feed, 0.040 in. depth of cut. Dry or water-base coolant.
Rough Boring
C-2 or C-3 grade: If insert type boring bar, use standard positive rake tools with largest possible SCEA and 1/16 in. nose radius. If brazed tool bar, grind 0 degree back rake, 10 degree pos. side rake, 1/32 in. nose radius and largest possible SCEA. Speed: 70 sfm depending on the rigidity of setup, 0.005-0.008 in. feed, 1/8 in. depth of cut. Dry, oil or water-base coolant.
Finish Boring
C-2 or C-3 grade: Use standard positive rake tools on insert type bars. Grind brazed tools as for finish turning and facing except back rake may be best at 0 degrees. Speed: 95-110 sfm, 0.002-0.004 in feed. Water-base coolant.
Notes:
1 SCEA - Side cutting edge angle or lead angle of the tool.
2 At any point where dry cutting is recommended, an air jet directed on the tool may provide substantial tool life increases. A water-base coolant mist may also be effective.
3 Oil coolant should be premium quality, sulfochlorinated oil with extreme pressure additives. A viscosity at 100 degrees F from 50 to 125 SSU.
4 Water-base coolant should be premium quality, sulfochlorinated water soluble oil or chemical emulsion with extreme pressure additives. Dilute with water to make 15:1 mix. Water-base coolant may cause chipping and rapid failure of carbide tools in interrupted cuts.
Table 17
RECOMMENDED TOOL TYPES AND MACHINING CONDITIONS
Operations
Carbide Tools
Facing Milling
Carbide not generally successful, C- grade may work. Use positive axial and radial rake, 45 degree corner angle, 10 degree relief angle. Speed: 50-60 sfm. Feed: 0.005-0.008 in. Oil or waterbase coolants will reduce thermal shock damage of carbide cutter teeth.
End Milling
Not recommended , but C-2 grades may be successful on good setups. Use positive rake. Speed: 50-60 sfm. Feed: Same as high speed steel. Oil or water-base coolants will reduce thermal shock damage.
Drilling
C-2 grade not recommended, but tipped drills may be successful on rigid setup if no great depth. The web must thinned to reduce thrust. Use 135 degree included angle on point. Gun drill can be used. Speed: 50 sfm. Oil or water-base coolant. Coolant-feed carbide tipped drills may be economical in some setups.
Reaming
C-2 or C-3 grade: Tipped reamers recommended, solid carbide reamers require vary good setup. Tool geometry same as high speed steel. Speed: 50 sfm. Feed: Same as high speed steel.
Tapping
Not recommended, machine threads, or roll-form them.
Electrical Discharge Machining
The alloys can be easily cut using any conventional electrical discharge machining system (EDM) or wire (EDM).
Notes:
5 M-40 series High Speed Steels include M-41 , M-42, M-43, M-44, M-45 and M-46 at the time of writing. Others may be added and should be equally suitable.
6 Oil coolant should be a premium quality, sulfochlorinated oil with extreme pressure additives. A viscosity at 100 degree F from 50 to 125 SSU.
7 Water-base coolant should be premium quality, sulfochlorinated water soluble oil or chemical emulsion with extreme pressure additives. Dilute with water to make 15:1 mix.
Table 18
Plasma Arc Cutting
Our alloys can be cut using any conventional plasma arc cutting system. The best arc quality is achieved using a mixture of argon and hydrogen gases. Nitrogen gas can be substituted for hydrogen gases, but the cut quality will deteriorate slightly. Shop air or any oxygen bearing gases should be avoided when plasma cutting these alloys.
YUHONG HOLDING GROUP is one of the largest Procurement, Engineering & Contracting Group companies in China. Our group branch company and factory have been already approved by : ABS, LR, DNV, GL, BV, CCS, KR, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9...
YUHONG HOLDING GROUP is one of the largest Procurement, Engineering & Contracting Group companies in China. Our group branch company and factory have been already approved by : ABS, LR, DNV, GL, BV, CCS, KR, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9...
