Although fasteners are low cost items, when fastener failures occur they can have a severe impact on the economics of plant operations. It is increasingly important to deal effectively with materials and corrosion problems even for low cost items such as threaded fasteners because of changes due to: equipment upgrades; higher capital costs; water recycling; and, more aggressive process conditions.

This paper relates primarily to the use of stainless steel and specialty alloy threaded fasteners in pulp, paper, biomass conversion and other industrial facilities, but references to carbon steel and low alloy steel threaded fasteners are also included since these materials are used extensively throughout the industries.

Part 1 of two papers on threaded fasteners was presented during CORRROSION 2011.1 The first paper discussed threaded fastener failure modes, design criteria of connections, specifications, standards and identification markings. This paper, which is Part 2, discusses fundamentals of screw threads, galling and seizing, friction and lubrication effects, installation methods, guidelines for use and corrosion upgrading of threaded fasteners.

The term threaded fasteners is used in the paper to indicate all forms of fasteners including bolts, studs, screws, cap screws, nuts and washers.

Subject
Materials, Friction, Stainless alloys, Machinery, Tolerances, Installation, Lubricants, Joints, Screws, Stress, Force, Stainless steel, Fasteners
Keywords:
fastener, thread, nut, bolt, stud, screw, failure, socket-head, cap screw, torque
© 2012 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2012
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.