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Salt Bath Nitriding

Abstract:

Salt Bath Nitriding (SBN) in a molten salt bath employs the temperature range of  510C  to 580C. The case hardening medium is a molten, nitrogen-bearing, fused-salt bath  SBN is a sub-critical casehardening process; thus, dimensional stability can be maintained. SBN  adds more nitrogen and less carbon to ferrous materials.  Case depth is in the order of .0006" to .0008" Thick with up to .0002" thick representing surface build-up.

SBN at TechPlate has several proprietary modifications and is applied to a wide variety of carbon, low-alloy steels, tool steels, stainless steels, and cast irons.

SBN Applications
Primarily used to improve wear resistance of surfaces and to increase the endurance limit in fatigue. For many steels, resistance to corrosion is improved. This process is not a deep case or hardened cores. Categories: tooling; firearms; gears & cams; plastics injection molds; cutting tools.

SBN is the chemical diffusion on metallurgical structures primarily through absorption and reaction of nitrogen rather than through the minor amount of carbon assimilation. Some processes are represented by a number of commercial trade names, a typical commercial bath for salt bath nitriding is composed of a mixture of sodium and potassium salts.

At TechPlate Cyanide-free SBN compositions have also been introduced. However, in the active bath, a small amount of cyanide, generally up to 5.0%, is produced as part of the reaction. This is a relatively low concentration, and these compositions have gained widespread acceptance because they minimize substantially to the source of pollution.

Effects of Steel Composition.
Although the properties of alloy steels are improved by the compound and diffusion layers, relatively greater improvement is achieved with plain carbon steels of low and medium carbon content. For example, the improvement in fatigue strength of unnotched test bars of 1015 steel nitrided by this process for 90 min at 565̊C and water quenched (to further enhance fatigue properties) is roughly 100%. Improvement obtained with similarly treated test bars made of 1060 steel is about 45 to 50%.


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TechPlate, Inc.
1571-H S. Sunkist St. Anaheim, CA 92806 
Tel: 714.634.9254 - Fax: 714.634.9382 
E-mail: info@techplate.com
Revised: 02-13-2006