N/A The alloys described here work harden rapidly during machining and require more power to cut than do the plain carbon steels. The metal is 'gummy', with chips that tend to be stringy and tough. Machine tools should be rigid and used to no more than 75% of their rated capacity. Both work piece and tool should be held rigidly; tool overhang should be minimized. Rigidity is particularly important when machining titanium, as titanium has a much lower modulus of elasticity than either steel or nickel alloys. Slender work pieces of titanium tend to deflect under tool pressures causing chatter, tool rubbing and tolerance problems.

Make sure that tools are always sharp. Change to sharpened tools at regular intervals rather than out of necessity. Titanium chips in particular tend to gall and weld to the tool cutting edges, speeding up tool wear and failure. Remember- cutting edges, particularly throw-away inserts, are expendable. Don't trade dollars in machine time for pennies in tool cost.

Feed rate should be high enough to ensure that the tool cutting edge is getting under the previous cut thus avoiding work-hardened zones. Slow speeds are generally required with heavy cuts. Sulfur chlorinated petroleum oil lubricants are suggested for all alloys but titanium. Such lubricants may be thinned with paraffin oil for finish cuts at higher speeds. The tool should not ride on the work piece as this will work harden the material and result in early tool dulling or breakage. Use an air jet directed on the tool when dry cutting, to significantly increase tool life.

Lubricants or cutting fluids for titanium should be carefully selected. Do not use fluids containing chlorine or other halogens (fluorine, bromine or iodine), in order to avoid risk of corrosion problems. The speeds are for single point turning operations using high speed steel tools. This information is provided as a guide to relative machinability, higher speeds are used with carbide tooling.

N/A

• Superior corrosion resistance
• Almost double the yield strength
• Exceptionally low magnetic permeability
• Outstanding cryogenic properties

• Components using the combination of excellent corrosion resistance and high strength currently include pumps, valves and fittings, fasteners, cables, chains, screens and wire cloth, marine hardware, boat and pump shafting, heat exchanger parts, springs and photographic equipment.
• Fastener - High strength, and higher strength fasteners can improve the durability of you equipment
• Marine hardware - Mastings, tie downs
• Marine and Pump shafts - better corrosion than types 304 and 316, with double the yield strength.
• Valves and fittings - better corrosion than types 304 and 316, with double the yield strength.
• Down hole rigging - better corrosion than types 304, 316 and 17-4, with double the yield strength in annealed condition.
• Reduced cross sections - better corrosion than types 304, 316 and 17-4,

N/A Nitronic 50 Stainless Steel can be supplied annealed at 1950 ºF to 2050 ºF (1066 ºC to 1121 ºC). For most applications, the 1950 ºF (1066 ºC) condition should be selected, as it provides a higher level of mechanical properties along with excellent corrosion resistance. When as-welded material is to be used in strongly corrosive media, the 2050 ºF (1121 ºC) condition should be specified in order to minimize the possibility of intergranular attack.

N/A Armco Nitronic 50 Stainless Steel provides outstanding corrosion resistance - superior to Types 316, 316L, 317 and 317L in many media. For many applications the 1950 ºF (1066 ºC) annealed condition provides adequate corrosion resistance and a higher strength level. In very corrosive media or where material is to be used in the as-welded condition, the 2050 ºF (1121 ºC) annealed condition should be specified. High-Strength (HS) Nitronic 50 bars are useful for applications such as shafting and bolting, but do not quite exhibit the corrosion resistance of the annealed conditions in all environments.

Intergranular Attack

The resistance to intergranular attack is excellent even when sensitized at 1250 ºF (675 ºC) for one hour to simulate the heat-affected zone of heavy weldments. Material annealed at 1950 ºF (1066 ºC) has very good resistance to intergranular attack for most applications. However, when thick sections are used in the as-welded condition in certain strongly corrosive media, the 2050 ºF (1121 ºC) condition gives optimum corrosion resistance.

Stress-Corrosion Cracking Resistance

In common with most stainless steels, under certain conditions, Armco Nitronic 50 Stainless Steel may stress-corrosion crack in hot chloride environments. When tested in boiling 420/0 MgCl₂ solution, a very accelerated test, Nitronic 50 Stainless Steel is between types 304 and 316 stainless steels in resistance to cracking. There is little difference in susceptibility to cracking whether in the annealed, high-strength (HS), or cold-drawn conditions.

Sulfide Stress Cracking

Both laboratory tests and field service experience have shown that Armco Nitronic 50 stainless has excellent resistance to sulfide stress cracking in air conditions. Nitronic 50 in both the annealed and high-strength (hot rolled) conditions has been included in the 1996 revision of NACE Standard MR-01 -75' "Sulfide Stress Cracking Resistant Metallic Material for Oil Field Equipment," at hardness levels up to RC 35 maximum. The resistance to cracking in laboratory tests in synthetic sour-well solution(5% NaCl + ½% acetic acid. saturated with H₂S)