Microstructure Property relation in thermo-mechanical control processed Low Carbon Microalloyed Steel for LPG Cylinder

Authors

  • SANTOSH KUMAR RESEARCH AND DEVELOPMENT CENTRE FOR IRON AND STEEL, STEEL AUTHORITY OF INDIA LIMITED
  • B Sunita Minz Bokaro Steel Plant, Steel Authority of India Limited
  • Saurav Ghosh Bokaro Steel Plant, Steel Authority of India Limited
  • N Mondal RESEARCH AND DEVELOPMENT CENTRE FOR IRON AND STEEL, STEEL AUTHORITY OF INDIA LIMITED
  • Dhirendra Kumar RESEARCH AND DEVELOPMENT CENTRE FOR IRON AND STEEL, STEEL AUTHORITY OF INDIA LIMITED

Keywords:

TMCP, HSLA Steel, LPG Cylinder, Tensile test, Microstructure

Abstract

LPG Cylinder manufacturing is a cylindrical forming process which involving strength as well as deep drawing and welding properties. An LPG cylinder is a safety critical components and demands very careful selection of steel quality. LPG cylinder is undertaken in India mainly by using a superior grade Al-killed low-carbon micro alloyed steel with limits of S and P control, under the specification of IS 6240, IS 15914, EN 10120 and JIS G3116. A critical difference of these grades is that the formed cylinders are subjected to normalizing treatment in the range of 880-920oC or stress relieving treatment in the temperature range of 690-710oC.

Present work has been carried out to alloy design to achieve higher yield strength, tensile strength and elongation etc. to compensate drop in mechanical properties. Higher strength steel for LPG Cylinder has been made by alloy design technology and combining controlled rolling and controlled cooling through thermo-mechanical control process at Bokaro Steel Plant.  This paper describes the practical and cost effective solution for improving the formability and strength of LPG grade steel by evolution of microstructure-property relation.

KeyWord: TMCP, HSLA Steel, LPG Cylinder, Tensile test, Microstructure

References

Yoshihiko Ono, Yoshimasa Funakawa, Kaneharu Okuda, Kazuhiro Seto, Naoki Ebisawa, Koji Inoue And Yasuyoshi Nagai; “Roles of Solute C and Grain Boundary in Strain Aging Behaviour of Fine-grained Ultra-low Carbon Steel Sheets”, ISIJ International, Vol. 57 (2017), No.7, p.1273

Z. Marciniak , J.L. Duncan and S.J. Hu, Mechanics of Sheet Metal Forming , Butterworth-Heinemann, An imprint of Elsevier Science Linacre House, Jordan Hill, Oxford OX2 8DP 225 Wildwood Avenue, Woburn, MA 01801-2041

http://www.idconline.com/technical_references/pdfs/mechanical_engineering/Residual_stresses_in_weld_joints.pdf

J. M. Gray and A. J. DeArdo, HSLA Steels Metallurgy and Applications, ASM Int., USA, (1986), p. 83

F. Siciliano Jr. and J. J. Jonas, Metall Transactions A, 2000, Vol. 31 A, p.511

E. V. Pereloma, B. R. Crawford, P.D. Hodgson, 2001, A 299 ,p. 27

B. Hutchinson , T. Siwecki , J. Komenda , J. Hagstro¨m , R. Lagneborg , J.-E. Hedin and M. Gladh, Ironmaking & Steelmaking, p.1

Anjana Deva, B.K. Jha and N.S Mishra, Material Science & Technology, Vol 27, No 3, March 2011, p. 710

Downloads

Published

2019-05-03

Issue

Vol. 9 No. 1 (2019)

Section

Articles

License

Declaration and Copyright Transfer Form

(to be completed by authors)

I/ We, the undersigned author(s) of the submitted manuscript, hereby declare, that the above manuscript which is submitted for publication in the STM Journals(s), is not published already in part or whole (except in the form of abstract) in any journal or magazine for private or public circulation, and, is not under consideration of publication elsewhere.

  • I/We will not withdraw the manuscript after 1 week of submission as I have read the Author Guidelines and will adhere to the guidelines.
  • I/We Author(s ) have niether given nor will give this manuscript elsewhere for publishing after submitting in STM Journal(s).
  • I/ We have read the original version of the manuscript and am/ are responsible for the thought contents embodied in it. The work dealt in the manuscript is my/ our own, and my/ our individual contribution to this work is significant enough to qualify for authorship.
  •  I/We also agree to the authorship of the article in the following order:

Author’s name                                    

 

1. ________________

2. ________________

3. ________________

4. ________________

 

We  Author(s) tick this box and would request you to consider it as our signature as we agree to the terms of this Copyright Notice, which will apply to this submission if and when it is published by this journal.