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Product Bulletin

Recommended Uses for SECO/WARWICK Atmosphere Generators

Protective Atmosphere

SECO/WARWICK manufactures three types of protective gas atmosphere generators:  Endogas® (endothermic), Exogas® (exothermic) and Ammogas® (dissociated ammonia).  SECO/WARWICK's refrigerant dryers reduce dew point of exothermic atmospheres from 105°F/40°C to 40°F/4°C.  

To learn more about the practical implementation of an atmosphere generator in your facility, follow this link for a background paper from the Furnace Controls & Sensors 2006 Conference that provides basic information:   How to achieve the Best Performance and Longest Life from your Gas Generator.  

The following chart may be used as a guideline for selecting protective atmosphere for a heat treatment process:

Metals to be processed Process Time Cycle Appearance Temperature Range Protective Atmosphere
Long Short Bright Clean °F see notes below
Low Carbon Steels Anneal   x x   1200-1350 Exogas   2, 5
Med. & High Carbon Steels Anneal
(no decarb)
x x x   1200-1450 Endogas 
Alloy Steels, Medium & High Carbon Anneal
(no decarb)
x x x   1300-1600 Endogas 
High Speed Tool Steels, Molybdenum Anneal
(no decarb)
x x x   1400-1600 Endogas 
Stainless Steels, Chromium & Nickel Chromium Anneal x x x   1800-2100 Endogas 
Copper Anneal x x x   400-1200 Exogas 3      
Various Brasses Anneal x x   x 800-1350 Exogas 3 Ammogas 
Copper-Nickel Alloys Anneal x x x   800-1400 Exogas 3
Silicon Copper Alloys Anneal x x x   1200-1400 Exogas   2, 5
Aluminum Alloys Anneal & Homogenize x x x   700-1100 Exogas   2, 3, 5
Low Carbon & Silicon Steels Anneal   x   x 6 1400-1500 Exogas   2, 5
Low Carbon & Silicon Steels Bluing   x   x 850-950 Exogas   4, 5
Low Carbon Steels Copper Brazing   x x   2050 Exogas   2, 5      
Medium, High Carbon & Alloy Steels Copper Brazing
(no decarb)
  x x   2050 Endogas
High Carbon, High Chromium Steels Copper Brazing
(no decarb)
  x x   2050 Ammogas 
Stainless Steels Copper Brazing Phosphorous Copper   x x   2050 Ammogas 
Copper or Brass Brazing or Silver Soldering   x x   1200-1600 Exogas   3
Carbon & Alloy Steels Hardening
(no decarb)
  x   x 1400-2400 Endogas
Medium & High Carbon Steels Hardening
(no decarb)
  x x   1400-1800 Endogas 
Alloy Steels, Medium & High Carbon Hardening
(no decarb)
  x x   1400-1800 Endogas 
High Speed Tool Steels, Molybdenum Hardening
(no decarb)
  x x   1800-2400 Endogas
All classes of Ferrous Metals Tempering or Drawing   x x   400-1200 Exogas 2, 5
Carburizing Steels Gas Carburizing x     x 1400-1800 Endogas  1
Low Carbon Steels Normalizing x x     1600-1850 Exogas   2, 5 Endogas
High Carbon & Alloy Steels Normalizing
(no decarb)
x x     1500-2000 Endogas 

Notes:
(1) Exothermic atmosphere may be used as a carrier
(2) Rich gas atmosphere
(3) Lean gas atmosphere
(4) Medium rich gas atmosphere
(5) 40°F dew point atmosphere
(6) Slight oxide

Maintenance Tips for Atmosphere Generators:

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SECO/WARWICK

P. O. Box 908 180 Mercer Street Meadville, PA 16335-6908  USA
Phone (814)332-8400 - Fax (814)724-1407
info@secowarwick.com

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