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TEAM NATL: IRAD/CRAD - Dark Metal Technology (DMT)



NATL's Dark Metal Technology (DMT) provides enhanced abrasion and wear resistance in steels encountering abrasion and wear in any circumstance. DMT is currently used in weapons systems (barrels and internals) encountering extremes of use; and in the weapons and ammunition manufacturing processes replacing H6 chrome. 

DMT - M4 Carbine Barrels



DMT - Barrel Extension

(Pictures Left- DMT M4 Carbine barrels; right - barrel extension close up of a DMT barrel; Gray mottled surface of former white steel is the result of 'Dark Metal' processing.)

Chrome Glue

DMT replaces H6 Chrome internally within rifle barrels or acts as a 'Chrome Glue' bonding the chrome layer more tightly than plain steel.

4 M4s

Dark Metal Technology is currently in use extending operational and barrel lifetimes for the community and by large world class ammunition manufacturers.  It is currently under evaluation by MARCORSYSCOM.

Process Scalability & Manganese Phosphate

DMT is a totally scalable hot salt bath diffusion process and with proper time and temperature the resulting steel contains an enhanced self lubricous surface with internal interstitial enhancements. This process easily integrates with your manufacturing procedures. Based on scope of use licensing use on sight is available.  Manganese Phosphate can be applied to Dark Metal surfaces to augment environmental protection.

Zero Net Dimensional Processing Changes

DMT processing does not alter original component dimensions after treatment.  

DMT Surfaces Reject Adhesion

DM treated parts and components reject carbon, brass and aluminum adhesion after treatment.

DMT - Flash Suppressor and Cans

(Picture above- Two M4's with cans after 1000+ rounds of 5.56mm M855 testing on NATL's range; The test schedule: fire six mags; 1 mag semi, one mag 3 round burst until six mags fired; then cool each rifle to ambient and repeat until 1100 rounds total fired each rifle.  Results: Can on left - welded to its 'as-issued' flash suppressor after 500 rounds. Continued shooting it up to 1100 rounds - required strap wrench for removal. (A big strap wrench.) Can on right - removed by hand from its Dark Metal treated flash suppressor after 1100 rounds.)

Treatment Schedules - Vehicle Platforms Ideal Candidates

Components may even be returned from the field, treated and returned to the field. Systems subject to metal on metal wear like vehicle platforms are ideal candidates for Dark Metal Technology, reducing wear and abrasion from environmental effects.


DMT - In Use Today

 (Picture above - Dark Metal in use now: Top left clockwise; DM 20mm forming punches for brass & aluminum cases, FLIR thermal image rifle barrel, DM low/no lube M4 fire control system, DM 5.56mm forming punches for brass ammunition cases, DM cast iron cylinder sleeve for an 8K horsepower funny car, DM 7.62mm brass case forming punches; Center -  EDM image of the DM barrel chamber and throat.)

DMT Treatable Steels

Our process can be applied to hot worked tool steels S7, S4, D2, L6,P20,H11, H13, H22.

4140, 4330, 41V50, etc in this category are all able to accept the DMT process in both hardened state and annealed state.

DMT has been applied to steel alloys 5360, 8650 series and alloys 410,416,420,440. The c f, & J series are all candidates for treatment, as the 300 series 310,303,304,327,316L.


NATL has successfully applied Dark Metal Technology to Stellite components.

Call us to treat test samples of your steels.

Many other alloys have been successfully treated for commercial and military customers. Call us with questions. We'll gladly treat samples for your own investigation, research and review. - call NATL @603.772.5088 ext. 101.

(Picture below - NATL MK13 Mod. DMT)

NATL MK13 Mod. DMTDMT - Surgical Instruments

(Picture above - NATL DMT Snake series surgical instruments in .300 Win Mag and .308.)

DMT Treatable Alloys

DMT - Business EndThe steel 200 series is under evaluation at present, but ferritic 419, hsla, 409 types, Hadfield steel and banetic alloys for the rail industry, plus the cast iron alloy family of gray and nodular are all treatable; especially successful are engine sleeves - depending upon alloying.

Boron alloys, steels containing boron offer the end user huge options in high performance and aid in the dissolution of excessive particle coalescence by dispersing groups throughout the metal lattice.

The alloys ph 17-4-15-5,nak 55 and like steel systems are subject for treatment, however the copper % may affect some of the results.

But overall, the use of nak55 in (o) ring molds for rubber proved too massive in release and resulted in mild fouling. DMT reduced these mold release problems by 70% for certain customers.

Production steel, rubber molds, stamping tools, wear sleeves, bearing sections, axle bearing, gearing; can all use lower cost steels such as 4140, 41V50, 52100, thus rendering a high performance of near equal to that of hardened bearing materials.

NATL has treated wire of various gages all the way up to massive 2 foot diameter bundles for the 'drag line' oil sands recovery operations where abrasion, fretting and wear from sand take their toll on the 1 mile long wire cable bundles pulling a bucket the size of your house.

DMT - Weapons Systems Use

(Picture above - Weapon systems, barrels and fire control system internals with Dark Metal Technology.)

DMT in Review

DMT is under review with the US Army Sierra Vista COTs program and a USMC SBIR Phase 2, Thermally Stable Machine Gun Barrel; and was introduced and reviewed at the 2014 US Navy Opportunity Forum in Crystal City June 2014.

Already in use on M4s, M240's, and many precision rifle systems; our current users can download NATL DMT Break-in and Cleaning Guide – For Bolt/Semi/Crew-Served or GAU Barrels HERE.

Thank You

The entire NATL staff thanks all of the current users of Dark Metal Technology in their weapons systems, manufacturing operations and global waste disposal efforts.


Our Location and Operating HoursFind

Industrial Drive, Exeter, NH Our Address:41 Industrial Drive  #5
Exeter, NH USA 03833
Phone: (603) 772-5088
    Fax: (603) 772-9088
Hours of Operation:
Mon. through Fri. 9 am to 5 pm EST

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