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INTRODUCTION

DURING recent years, we have witnessed the development and practical application of a novel approach to the production of a high-strength linepipe steel which can readily meet the mechanical property requirements of the ISO 3183 and API 5L specifications at yield strength levels well in excess of 520 MPa, and probably up to at least 620 MPa. This potentially covers the microalloyed steel grades from API X75 to X90. The development relies on the application of research performed decades ago,[1] with very low carbon steel (

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