ATC is a small minority owned company specializing in coatings that offer a wide variety of solutions for difficult wear and corrosion problems. ATC's Heat Treating services offer heat treatment covering a range of materials, specializing in advanced engineering alloys, like Grade 91, that require very precise control of temperature. 


    CES is a division of ATC offering a broad range of engineering services that include industry experts in metallurgy, failure analysis, and advanced materials Metallurgical lab testing and research (Grade 91 material development with ORNL). Combustion Engineering Solutions are experts in Boiler and HRSG design, retrofit, and material supply Project Management.  With over 300 years of experience in the industry CES is a ISO 9001 Certified company that strives to support the commercial success of our clients by providing superior technical services and problem-solving capabilities covering all materials-related issues in as timely and cost-effective manner as possible.   

What We Do

Failure Analysis

Condition Assessments

Material Characterization

Welding Metallurgy

Fitness for Service

Pressure Parts & Piping (Engineering - Design)

Structural Steel (Engineering - Design)

Ducts (Engineering - Design)

Construction (Engineering - Design)

Heat Treatment

Flame Hardening

Diffusion Coatings

Thermal Spray


Who We Are

Engineering - Materials


 With more than 300 years accumulated experience in energy-related industries, the materials and welding engineers at ATC-CES can provide assistance with or overall management of a broad array of projects, from root cause investigations to explain failures of critical components to the development and implementation of risk-based inspection programs for high energy piping systems to the planning and execution of weld repairs on major CSEF pressure parts (e.g., Grade 91). 

Engineering - Design


  Providing professional Boiler and HRSG Engineering Solutions and Material for the Utiity, Pulp and Paper Market with Integrity, Customer Focus, and Speed with a Goal to keep Steam Generation Safe, Reliable, and Competitive 

Codes & Standards


 Metallurgical Consulting, Litigation Support, Training (Metallurgy, Welding Engineering, NDE, Heat Treatment), Engineering Project Management, Assistance with Codes and Standards  

Thermal Spray


 Extendalloy - Nickel Based Tungsten Carbide and Nickel Based Chromium Carbide Alloys applied by thermal spray. Thermal spray is a process whereby harder, more corrosion resistant, or tougher materal is applied as a coating to a base metal. We can spray any commonly specified engineering material. ATC can provide traditional powder spray, spray-and-fuse, HVOF, plasma spray, and twin-arc. 

Heat Treating


Specializing in heat treatment of advanced pressure part alloys with over 175 years of experience.  Offering all types of services including, qeunch and tempering, normalizing, annealing, solution annealing, stabilization annealing, stress-relieving, post-weld heat treatment, precipitation hardening, and flame hardening.  ATC-CES has received the necessary permits to clean polymer-infused components.

Diffusion Coatings


Offer a variety of Coatings services including Diffusion, Thermal Spray, including traditional powder spray, spray and fuse, HVOF, plasma spray, and twin-arc.


Jeff Henry - Co-Owner / President / COO

Mr. Henry's professional experience has been concentrated on the service performance of power plant materials, with particular focus on high temperature behavior, welding, manufacturing, and the Creep Strength-Enhanced Ferritic Steels, such as Grade 91.  He has authored over 60 technical papers, is an ASME Fellow and is active on a number of the ASME Boiler & Pressure Vessel Code technical committees.  He is the former chair of BPV II, the Materials Standards Committee, and he currently chairs the Working Group on Creep Strength-Enhanced Ferritic Steel.  He also is a member of BPV I (Power Boilers), the Management Oversight Technical Committee (TOMC) and the Board of Pressure Vessel Technology.



Dr. Gang (Joe) Zhou - Chief Metallurgical Engineer

Dr. Zhou is a graduate of University of Tennessee, Knoxville with a doctorate in welding metallurgy.  He has 30+ years of diverse experience in failure analysis and condition assessment of power-generating equipment, including boilers, piping, HRSG's, steam turbines, generators, and industrial equipment.  

Dr. Zhou's areas of expertise include welding metallurgy and technology, welding repair, weldability testing and design, creep testing and design, corrosion testing and design.  Also, he is an expert in metallography and fractorgraphy, microstructural interpretation, phase transformation and aging behavior of heat-resistant materials.

He has conducted extensive research on creep rupture of long-seam welded piping, such as Mohave, Monroe, Mt. Storm and Nine Miles.  His recent researches have been focusing on CSEF steels, including effect of manufacture practice on creep behavior of Grade 91, Grade 91 DMW's failure behavior, Grade 91 SCC behavior and low creep ductility issues of CSEF steels.

Prior to joining CES, Dr. Zhou served as principle metallurgical engineer at Alstom Power, Inc. He is also a member of ASM International and AWS.



Curt Johns - P.E., MBA

Practical and innovative professional mechanical engineer with over 25 years’ experience. Leader of cross functional teams known for innovation, continuous improvement, quality, and on time delivery. Continuous improvement leader in engineering and manufacturing responsible for many cost saving design and process changes. Single biggest achievement was breaking down the wall between engineering and manufacturing and transforming the “us and them” mentality into a highly performing team.

Curt leads the development of domestic and international business at CES involving complex engineering activities encompassing all aspects of structural/duct and construction design engineering

• Contributes to the strategic planning for engineering proposal and contract activity

• Manages the direct activities of engineers and assist in their professional and technical development



Harley Grant - Co-Owner / CEO

Mr. Grant's professional focus has been on the development and applications of coatings used for both corrosion and erosion protection in various industries, but with a particular emphasis on coatings for the power, pulp, and paper industries.  Mr. Grant has operated ATC for the last 28 years and is known industry wide for the equality and innovativeness of his product.  He has been awarded two patents related to diffusion coating, one for the localized diffusion of chromium into a component and one for diffusion of metals using microwaves as the source of heat.  

In addition to his professional activities, he has been very active in the support of issues critical to Native Americans, and he has been appointed to a number of both state and federal commissions tasked with addressing specific social and economic issues of vital interest to the Indian peoples.



Short video of what we do...


Introduction to ATC-CES (pdf)


ISO 9001 Certification (pdf)


ATC-CES Quality Policy (pdf)


Current Issues with Grade 91 (pdf)


ATC-CES Shaft Report (pdf)


Contact Us

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200 Compress St., Chattanooga, TN 37405

(423) 267-0647