Principal Design Features

This is an age-hardenable alloy of nickel-chromium-iron. The additions of titanium and aluminum enable it to be age-hardened while molybdenum and copper contents enhance resistance to corrosive media. Designed primarily for applications in the production of gas.

Applications

It is used in the petroleum industry for applications such as gas well components, valves and tubing, as well as finding use in high-strength piping systems.

inconel-925[1]

Chemistry Data

Aluminum0.15 - 0.5
Carbon0.03 max
Chromium19.5 - 23.5
Copper1.5 - 3
IronBalance
Manganese1 max
Molybdenum2.5 - 3.5
Nickel38 - 46
Niobium0.5 max
Silicon0.5 max
Sulphur0.03 max
Titanium1.5 - 2.4

 

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. 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 30-40 feet per minute and feed of 0.004"-0.006" 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 embrittlement 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

Solution anneal at 1900 F to 1800 F and air cool. Aging is done at 1350 F for 8 hours, furnace cool at 75 F per hour down to 1175 F and hold at 1175 F for at least 12 hours then air cool.

Forging

Forging should be done in the range of 2150 F to 1700 F.

Hot Working

Hot working may be done in the range of 1800 F down to 1600 F. Avoid working at temperatures above 1800 F to retain corrosion resistance.

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 1850 F for at least 2 hours at temperature, air cool.

Aging

See "Heat Treat".

Hardening

May be hardened by heat treatment - see "Heat Treat" and also hardens due to cold working.

Physical Data

Density (lb / cu. in.) 0.294
Specific Gravity 8.14
Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) 0.109
Electrical Resistivity (microhm-cm (at 68 Deg F)) 701
Melting Point (Deg F) 2450
Poissons Ratio 0.281
Mean Coeff Thermal Expansion 7.32
Magnetic Permeability 1.01
Modulus of Elasticity Tension 28.7

Mechanical Data

MSO currently has no data available for this grade.