Corrosion-resistant steel that adds restrictions on chemical composition to ensure sufficient ferrite content decreases the tendency of CRES to develop cracks during welding. The equations restricting composition are based on the Schaeffler constitution diagram

Malin, C. O.

English

NASA Technical Reports Server

April 1967	 1	 Brief 67-10069 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Controlled Ferrite Content Improves Weldability of Corrosion-Resistant Steel 
The problem: 
Experience has shown that 347 CRES has a 
tendency to develop cracks during welding, both in the 
fusion zone and the adjacent heat affected zone. This 
fault is most prevalent in materials containing less 
than 4% calculated ferrite. Welding rod with con-
trolled ferrite content is available but has no effect 
where joints are made without filler metal. 
The solution: 
An otherwise standard formulation of corrosion-
resistant steel that incorporates additional restrictions 
on chemical composition to ensure a calculated ferrite 
content of from 5% to 9% in welded material. The 
equations restricting the chemical composition are 
based on the Schaeffler constitution diagram for stain-
less steel weld metal.
Note: 
Inquiries concerning this innovation may be di-
rected to:
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B67-10069 
Patent status: 
No patent action is contemplated by NASA. 
Source: Craig 0. Malin 
of North American Aviation, Inc. 
under contract to 
Marshall Space Flight Center 
(M-FS-568) 
Category 03 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19670000069 2020-03-11T20:21:14+00:00Z


Controlled ferrite content improves weldability of corrosion-resistant steel

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