MACHINING DATA OF NITRONIC®
Based on 1" Dia Annealed (RB 95) 5 hour form tool life using high-speed tools. Carbide tools are suggested , for rates
better than 50% of Type 304. These rates are for carbide tools, Type C-2 for roughing, drilling and reaming. Type C-3 for finishing .
Suggested starting rates are:

SINGLE POINT TURNING :
Roughing - 0.15" depth, 0.015"/rev feed - 175 SFM
Finishing - 0.025" depth, 0.007"/rev feed - 200 SFM

DRILLING :
1/4" Dia hole - 0.004"/rev feed - 60 SFM
1/2" Dia hole - 0.007"/rev feed - 60 SFM
3/4" Dia hole - 0.010"/rev feed - 60 SFM

REAMING:
Feed - same as drilling - 100 SFM

SIDE AND SLOT MILLING :
Roughing - 0.25" depth - 0.007"/tooth feed - 125 SFM
Finishing - 0.050" depth - 0.005"/tooth feed - 140 SFM
MACHINABILITY RATINGS
MATERIAL SPEED SURFACE FT/MIM SPEED % OF B1112
AISI B1112 165 100
Nitronic 30 Annealed 30 18
Nitronic 40 Annealed 40 24
Nitronic 50 Annealed 35 21
Nitronic 50 Grade A or Level 1 34 21
Nitronic 50 Grade B or Level 2 32 19
Nitronic 50 Grade C or Level 3 30 18
Nitronic 50 Grade D or Level 4 28 17
Nitronic 50 Grade E or Level 5 25 15
Nitronic 60 Annealed 40 24
Nitronic 60 Grade A or Level 1 38 23
Nitronic 60 Grade B or Level 2 36 22
Nitronic 60 Grade C or Level 3 32 19
Nitronic 60 Grade D or Level 4 28 17
Nitronic 60 Grade E or Level 5 25 15
17-4 PH soln treated 75 45
17-4 PH aged 60 36
These machinability ratios must be recognized as approximate values. They are a reasonable guide to relative tool life and lower required for cutting . It is obvious, however, that variables of speed , cutting oil , feed and depth of cut will significantly affect these ratios.
MACHINABILITY RATINGS MACHINABILITY RATINGS
MATERIAL SPEED SURFACE FT/MIM SPEED % OF B1112 MATERIAL SPEED SURFACE FT/MIM SPEED % OF B1112
AISI B1112 165 100 Nitronic 50 Annealed 35 21
Hast X 30 18 Nitronic 50 HS Lvl 1 34 21
C-276 40 18 Nitronic 50 HS Lvl 2 32 19
B-2 35 21 Nitronic 50 HS Lvl 3 30 18
C- 22 TM 50 30 Nitronic 50 HS Lvl 4 28 17
HR-120 TM 40 25 Nitronic 50 HS Lvl 5 25 15
20Cb-3 TM 65 40 Nitronic 60 Annealed 40 24
AL6XN TM 65 40 Nitronic 60 HS Lvl 1 38 23
A-286 Annealed 54 32 Nitronic 60 HS Lvl 2 36 22
A-286 Aged 30 18 Nitronic 60 HS Lvl 3 32 19
Nickel 200 Annealed 65 40 Nitronic 60 HS Lvl 4 28 17
Nickel 200 Cold Drawn 110 66 Nitronic 60 HS Lvl 5 25 15
Monel 400 Annealed/SR 60 36 Nitronic 30 30 18
Monel 400 Cold Drawn 80 48 Nitronic 40 40 24
Monel R405 Annealed/SR 60 36 Ti 6Al-4V soln annealed 40 25
Monel R405 Cold Drawn 80 48 Ti 6Al-4V aged 30 18
Monel K500 CW/HW 50 30 309 70 42
Monel K500 Annealed 60 36 310 70 42
Monel K500 Aged 40 25 304 75 45
600 Annealed 50 22 316 75 36
600 Cold Drawn 65 39 321 75 45
625 40 24 446 75 45
718 Annealed 40 24 303 100 60
718 Aged 20 12 416 145 88
825 20 12 17-4 PH soln treated 75 45
X-750 Equalized 40 24 17-4 PH aged 60 36
X -750 Aged 20 12 Rene 41 12 7
25 (L-605) 35 21 HAYNES TM 188 15 9
L605 Cold Worked 15 9 Waspaloy Annealed 45 20
MP 35N CW 45 20 Waspaloy Aged 20 12
MP 35N CW & Aged 20 12 MP 159 45 20
These machinability ratios must be recognized as approximate values. They are a reasonable guide to relative tool life and lower required for cutting. It is obvious, however, that variables of speed, cutting oil, feed and depth of cut will significantly affect these ratios.
20Cb-3 TM is a Registered Trademark of Carpenter Technology
HAYNES TM, HASTELLOY, TMC-22 TM and HR-120 TM are Trademarks of Haynes International
MONEL TM and INCONEL TM are Trademarks of Special Metals Corp.
AL6XN is a Trademark of Allegheny Technologies
NITRONIC is a Trademark of AK Steel
Waspaloy is a Trademark of United Technology Corp.
RENE is a Trademark of General Electric Corp.
MP159 TM and MP35N TM are Trademarks of SPS Technologies
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.
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 except 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 and contamination.
BAND-SAW CUTTING AND GRINDING
When band sawing these alloys, the more economical high speed steel blades can be utilized. The machine must be set up to cut at much slower speeds to use the high speed steels. Some equipment does not have the capability to slow as much as needed. Blades that are 1.5-2" wide or wider are recommended to provide a rigid set up. Tungsten carbide blades can be utilized and can cut much faster, the trade off will be the number of cuts per hour vs. the higher cost of the blade.
Grinding should be performed submerged or flooded with water soluble coolant. Soft materials may be gummy and may cause the need for the wheel to be dressed more often. Some aerospace grades do not allow grinding, as it can alter the properties of the material. Many of our materials are austenitic, and some are only slightly ferro-magnetic. When utilizing magnetic hold downs, be aware that other holding methods may be needed.
HIGH PERFORMANCE
ALLOYS, INC.
444 Wilson Street
Tipton, IN 46072 USA
An ISO 9001-2008 registered company
Phone765-945-8230
Fax765-945-8294
E-mail sales@hpalloy.com
Website www.hpalloy.com
NITRONIC is a Registered trademark of AK Steel (Armco).