Nickel 800 HTSpecifications: Alloy 800 - UNS N 08800Alloy 800H - UNS N08810Alloy 800HT - UNS N08811Werkstoff Nr 1.4876Inconel 800 (trademark)

Rod ASTM B 408, ASME SB 408, ISO 9723, BS 3076NA15, DIN 17460, EN 10095Bar AMS 5766, ASTM B 408, ASME SB 408, ISO 9723, BS 3076NA15, DIN 17460, EN 10095Wire ISO 9724, BS 3075NA15Forgings AMS 5766, ASTM B564, ASME SB 564, ASME Code Case 1949, ISO 9725, DIN 17460Plate AMS 5871, ASTM A 240/A 480, ASME SA 240/SA 480, ASTM B 409/B 906, ASME SB

409/SB 906, BS 3072NA15, DIN 17460, EN 10028-7, EN 10095Sheet AMS 5871, ASTM A 240/A 480, ASME SA 240/SA 480, ASTM B 409/B 906, ASME SB

409/SB 906, BS 3072NA15, DIN 17460, EN 10028-7, EN 10095Strip AMS 5871, ASTM A 240/A 480, ASME SA 240/SA 480, ASTM B 409/B 906, ASME SB

409/SB 906, BS 3073NA15, DIN 17460, EN 10028-7, EN 10095Pipe ASTM B 407/B 829, ASME SB 407/SB 829 (Seamless Pipe), BS 3074NA15 (Seamless

Pipe), DIN 17459Tube ASTM B 163, ASME SB 163 (Seamless Condenser & Heat Exchanger Tubes), ASTM B

407/B 829, ASME SB 407/SB 829 (Seamless Tube), ASTM B 515/B 751, ASME SB 515/SB 751 (Welded Tubes), BS 3074NA15 (Seamless Tubes), ISO 6207, DIN 17459

Other ASTM B 366, ASME SB 366 (Fittings) - ASME Code Cases N201 & N254 (All products for nuclear construction), ISO 4955A (General), NACE MR-01-75, AFNOR Z5 NC 35-20

All ASME Code Case 1325, SEW 470, VdTUV 412 and 434,

Data Sheet:Alloy 800, Alloy 800H, Alloy 800 HTWeight % Ni Cr Fe C Al Ti Al +TiAlloy 800 30.0 -35.0 19.0-23.0 39.5 min 0.10 max 0.15-0.60 0.15-0.60 0.30-1.20Alloy 800H 30.0 -35.0 19.0-23.0 39.5 min 0.05-0.10 0.15-0.60 0.15-0.60 0.30-1.20Alloy 800HT

30.0 -35.0 19.0-23.0 39.5 min 0.060.10 0.25-0.60 0.25-0.60 0.85-1.20

The 800 series of alloy (800, 800H and 800HT) are nickel-iron-chromium super alloys that have excellent properties of high temperature strength and resistance to oxidation, carburization and other types of high temperature corrosion. Alloy 800, 800H and 800HT are used in various applications from furnace components, petrochemical furnace cracker tubes to sheathing for electrical heating elements.

AvailabilityAlloy 800 is available in Bar (Round), Rod, Plate, Sheet, Strip, Shapes, Tube and Welding Wire. View Stock List, Plate Stock List or contact Sales for further availability.

Temp Hardness BHN

Tensile Strength Yield Strength (0.2% Offset)

ºF ºC ksi MPa Ksi Mpa80 27 126 77.8 536 21.7 150800 425 67.5 465 18.8 1301000 540 90 62.7 432 13.0 901200 650 84 54.8 378 13.5 931300 705 82 47.7 329 15.8 1091400 760 74 34.2 236 13.1 90

Chemistry Data : Aluminum 0.15 - 0.6 Aluminum + Ti 0.85 - 1.2 Carbon 0.06 - 0.1 Chromium 19 - 23 Copper 0.75 max Iron Balance Manganese 1.5 max Nickel 30 - 35 Silicon 1 max Sulphur 0.015 max Titanium 0.15 - 0.6

Principal Design Features This is a higher hot strength modification of Alloy 800, with higher carbon content and controlled aluminum/titanium. The result is much higher ASME Boiler and Pressure Code design values, creep and rupture properties than Alloy 800.

Applications Used in petrochemical equipment for heat exchangers, such as in ethylene or vinyl chloride production.

Machinability Conventional machining techniques used for iron based alloys may be used. This alloy does work-harden during machining and has higher strength and "gumminess" not typical of steels. Heavy duty machining equipment and tooling should be used to minimize chatter or work-hardening of the alloy ahead of the cutting. Most any commercial coolant may be used in the machining operations. Water-base coolants are preferred for high speed operations such as turning, grinding, or milling. Heavy lubricants work best for drilling, tapping, broaching or boring. Turning: Carbide tools are recommended for turning with a continuous cut. High-speed steel tooling should be used for interrupted cuts and for smooth finishing to close tolerance. Tools should have a positive rake angle. Cutting speeds and feeds are in the following ranges: For High-Speed Steel Tools For Carbide Tooling Depth Surface Feed Depth Surface Feed of cut speed in inches of cut speed in inches inches feet/min. per rev. inches feet/min. per rev. 0.250" 25-35 0.030 0.250" 150-200 0.020 0.050" 50-60 0.010 0.050" 325-375 0.008 Drilling: Steady feed rates must be used to avoid work hardening due to dwelling of the drill on the metal. Rigid set-ups are essential with as short a stub drill as feasible. Heavy-duty, high-speed steel drills with a heavy web are recommended. Feeds vary from 0.0007 inch per rev. for holes of less than 1/16" diameter, 0.003 inch per rev. for 1/4" dia., to 0.010 inch per rev. for holes of 7/8"diameter. Slow surface speed, as 8-10 feet/minute, are best for drilling. Milling: To obtain good accuracy and a smooth finish it is essential to have rigid machines and fixtures and sharp cutting tools. High-speed steel cutters such as M-2 or M-10 work best with cutting speeds of 5 to 15 feet per minute and feed of 0.001"-0.004" per cutting tooth. Grinding: The alloy should be wet ground and aluminum oxide wheels or belts are preferred.

Forming This alloy has good ductility and may be readily formed by all conventional methods. Because the alloy is stronger than regular steel it requires more powerful equipment to accomplish forming. Heavy-duty lubricants should be used during cold forming. It is essential to thoroughly clean the part of all traces of lubricant after forming as embitterment of the alloy may occur at high temperatures if lubricant is left on.

Welding The commonly used welding methods work well with this alloy. Matching alloy filler metal should be used. If matching alloy is not available then the nearest alloy richer in the essential chemistry (Ni, Co, Cr, Mo) should be used. All weld beads should be slightly convex. It is not necessary to use preheating. Surfaces to be welded must be clean and free from oil, paint or crayon marking. The cleaned area should extend at least 2" beyond either side of a welded joint. Gas-Tungsten Arc Welding: DC straight polarity (electrode negative) is recommended. Keep as short an arc length as possible and use care to keep the hot end of filler metal always within the protective atmosphere. Shielded Metal-Arc Welding: Electrodes should be kept in dry storage and if moisture has been picked up the electrodes should be baked at 600 F for one hour to insure dryness. Current settings vary from 60 amps for thin material (0.062" thick) up to 140 amps for material of 1/2" and thicker. It is best to weave the electrode slightly as this alloy weld metal does not

tend to spread. Cleaning of slag is done with a wire brush (hand or powered). Complete removal of all slag is very important before successive weld passes and also after final welding. Gas Metal-Arc Welding: Reverse-polarity DC should be used and best results are obtained with the welding gun at 90 degrees to the joint. For Short-Circuiting-Transfer GMAW a typical voltage is 20- 23 with a current of 110-130 amps and a wire feed of 250-275 inches per minute. For Spray-Transfer GMAW voltage of 26 to 33 and current in the range of 175-300 amps with wire feed rate of 200-350 inches per minute are typical. Submerged-Arc Welding: Matching filler metal, the same as for GMAW, should be used. DC current with either reverse or straight polarity may be used. Convex weld beads are preferred.

Heat Treatment The alloy may be annealed but is not hardenable by heat treatment.

ForgingMay be forged at 2200 F to 1850 F.

Hot Working Hot work from 2200 F to 1600 F.

Cold Working Cold forming may be done using standard tooling although plain carbon tool steels are not recommended for forming as they tend to produce galling. Soft die materials (bronze, zinc alloys, etc.) minimize galling and produce good finishes, but die life is somewhat short. For long production runs the alloy tool steels ( D-2, D-3) and high-speed steels (T-1, M-2, M-10) give good results especially if hard chromium plated to reduce galling. Tooling should be such as to allow for liberal clearances and radii. Heavy duty lubricants should be used to minimize galling in all forming operations. Bending of sheet or plate through 180 degrees is generally limited to a bend radius of 1 T for material up to 1/8" thick and 2 T for material thicker than 1/8".

Annealing Anneal at 2100 F and air cool.

Hardening Hardens only by cold work.

Physical Data : Density (lb / cu. in.) 0.287 Specific Gravity 7.94 Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) 0.11 Electrical Resistivity (microhm-cm (at 68 Deg F)) 595 Melting Point (Deg F) 2500 Poissons Ratio 0.34 Thermal Conductivity 80 Mean Coeff Thermal Expansion 7.9 Magnetic Permeability 1.01 Modulus of Elasticity Tension 28.5

Mechanical Data : There is no Mechnical data available for this grade.