The super 13Cr martensitic stainless steel consists of low C content below 0.03mass%, 13mass% Cr 5.5mass% Ni and 2mass% Mo and has good resistance of both sulfide stress cracking(SSC) at room temperature and localized corrosion at elevated temperatures compared with conventional 13Cr steel(AISI 420). The buffer solution containing CH3COONa-CH3COOH with high buffer power has been developed in order to carry out a more exact experiment under a constant pH between 3.0 and 5.5 The effect of H2S partial pressure and pH on SSC resistance of the super 13Cr stainless steel was evaluated in the newly developed buffer solution by constant strain method, slow strain rate technique(SSRT) and the cyclic SSRT in which the tensile and compression tests were repeated 15 times al the strain rate of 4 x 10−6 s−1 between 0.95 and 0.60 × yield strength. The SSC resistance was characterized and quantified by means of correlating H2S partial pressure and solution pH. SSRT gave the most severe evaluation for the SSC resistance of all the methods tested because SCC susceptibility in SSRT was evaluated under the plastic deformation condition up to failure. The constant strain tests which are 4 point bent beam test with notch and NACE tensile test according to NACE TM0177-90, and the cyclic SSRT showed almost the same evaluation result. Therefore, the cyclic SSRT was recommended as a very effective quick evaluation method for the SSC resistance of the super 13Cr stainless steel.

Subject
Test methods, Strain rate, Materials, Notches, Tensile tests, Partial pressures, Acidity, Constants, Steel, Corrosion resistance, Stainless steel, Sulfide stress cracking, Yield strength
Keywords:
Martensitic stainless steel, Sulfide stress cracking(SSC), Carbon dioxide(CO2), Hydrogen sulfide((H2S), Oil country tubular goods(OCTG), Slow strain rate technique(SSRT), Cyclic SSRT
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.