Until recently, the highest strength tubular goods generally used in sour oil and gas wells were those specified in API Standard 5AC, Grade C-75. These steels exhibit yield strengths in the 75 to 90 ksi range and have hardness values below 22 RC (237 BHN). Exploitation of deeper formations, however, has required that the section size be increased or that higher strength material be utilized. Application of the second alternative has led to the development of a tentative specification for an AISI 4130 (chromium-molybdenum) steel that possesses yield strength in the range of 90 to 105 ksi. This paper describes a laboratory evaluation of samples from production runs of casing made from this specification.

Subject
Rockwell hardness, Materials, Piping, Couplings, Hardness measurements, Joints, Heat, Steel, Sulfides, Brinell hardness, Hardness, Quenching and tempering, Yield strength
© 1971 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).
1971
Association for Materials Protection and Performance (AMPP)
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