Interpreting NACE MR0103 Standards: Hot Rolled Heat Treatment Condition

Introduction

This article provides a question and answer related to the interpretation of NACE MR0103 standards. The question is whether the “hot rolled” heat treatment condition for carbon steels, allowed in section 13.1.1, applies to flanges, fittings, seamless pipe, and other products that are not produced by rolling. The answer clarifies that hot-rolling and hot-forming are not equivalent and that forged material must be heat treated to meet the requirements of section 13.1.1.

Understanding Hot Rolled Heat Treatment Condition

Hot-rolling is a process used to produce steel products that involves heating the steel above its recrystallization temperature and then passing it through rollers to shape it. Hot-forming, on the other hand, involves heating the steel to a temperature below its recrystallization temperature and then shaping it through forging or pressing.

Clarifying Heat Treatment Requirements for Forged Material

According to section 13.1.1 of NACE MR0103 standards, carbon steel material must be heat treated to achieve a hardness of 22 HRC or lower. This requirement applies to all carbon steel material, including forged material. Therefore, forged flanges, fittings, seamless pipe, and other products must be heat treated to meet this requirement.

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