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A Case Study Of A 193 Grade B7 Used As A Teaching Tool 01

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2003 Annual Conference


Nashville, Tennessee

Publication Date

June 22, 2003

Start Date

June 22, 2003

End Date

June 25, 2003



Conference Session

Activities for the Materials Classroom

Page Count


Page Numbers

8.16.1 - 8.16.5



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Paper Authors

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Donald Goddard

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Session 1464

A Case Study of A 193 Grade B7 Used as a Teaching Tool

Donald L. Goddard PhD PE The University of Texas at Tyler


Utilization of A193 Grade B7 threaded rod as a case study in heat treatment of alloy steel is developed as a low cost, efficient approach to study standard material specifications, furnace operation, heat treatment, tensile properties, hardness, microstructure, and impact strength. By studying this 4140 type of material(commonly called "chrome-moly steel" ), basic concepts are examined and the students are familiarized with a common, high quality alloy that they can later use in practical applications.


Any student, having completed basic chemistry, would be ready for a first laboratory course in the realm of Materials Science and Mechanics of Materials, which might fall anywhere from the freshman to junior year, depending on the particular engineering curriculum. In such courses there is need for interrelated experiments which can give both depth and breadth of understanding which can be built upon in other classes, such as Machine Component Design. It is also very useful if such experiments should happen to be at the lower end of the cost range. A happy concurrence of these factors is to be found in threaded rod, which meets the ASTM Specification A 193 Grade B71

ASTM (American Society for Designation AISI-SAE 4140 ASTM A 193 Testing and Materials) specification UNS # G41400 Gr B7 A 193 is titled “Standard Carbon 0.38-0.43% 0.37-0.49% Specification for Alloy-Steel and Stainless Steel Bolting Materials for Manganese 0.75-1.00% 0.65-1.10% High-Temperature Service”. This is Phosphorus (max) 0.035% 0.035% a specification of rather broad scope Sulfur (max) 0.040 % 0.040% covering a variety of steels (over 50 Silicon 0.15-0.35% 0.15-0.35% grades and classes). However it is Chromium 0.80-1.10% 0.75-1.20% one grade, B7, that has proven Molybdenum 0.15-0.25% 0.15-0.25% particularly useful for fundamental teaching purposes. The Table 1 Alloy composition comparison between AISI- specification is not only an alloy SAE 4140 and ASTM A 193 Grade B7 specification, but it also covers aspects of manufacturing and product form. That makes the specification in itself an interesting study in specifications for the students. The cost aspect associated with the B7 grade of material

Proceedings of the 2003 American Society for Engineering Education Annual Conference & Exposition Copyright © 2003, American Society for Engineering Education

Goddard, D. (2003, June), A Case Study Of A 193 Grade B7 Used As A Teaching Tool 01 Paper presented at 2003 Annual Conference, Nashville, Tennessee. 10.18260/1-2--12578

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