What is ISO 15156-2:2016?

ISO 15156-2:2016, also known as "Petroleum and natural gas industries - Materials for use in S-containing environments in oil and gasproduction - Part 2: Cracking-resistant carbon and low alloy steels, and the use of cast iron," is an international standard developed by the International Organization for Standardization (ISO). It provides guidelines for the selection and qualification of materials used in equipment and structures intended to be used in S (hydrogen sulfide) service in the oil and gas industry.

Understanding ISO 15156-2:2016

This technical article aims to provide an in-depth understanding of ISO 15156-2:2016. The standard specifies requirements and recommendations for the use of carbon and low-alloy steel materials that are resistant to cracking in S environments. It also covers the use of cast iron in certain applications. By following the guidelines outlined in this standard, companies can ensure the integrity and safety of their operations in S-containing environments.

Cracking-resistant Carbon and Low Alloy Steels

The main focus of ISO 15156-2:2016 is on cracking-resistant carbon and low alloy steels. These materials are widely used in the oil and gas industry due to their excellent mechanical properties and cost-effectiveness. However, exposure to S can lead to sulfide stress cracking, which can compromise the structural integrity of the equipment. Therefore, it is crucial to select materials that demonstrate resistance to such cracking under S conditions.

Use of Cast Iron

ISO 15156-2:2016 also provides guidelines for the use of cast iron in specific applications. Cast iron has traditionally been utilized in several industries due to its excellent casting properties and wear resistance. However, in S-containing environments, cast iron may be susceptible to degradation and cracking. The standard specifies requirements for the use of cast iron, including chemical composition limits and post-production treatments, to ensure its suitability and durability.