ISO 9328-1:2018

Overview

ISO 9328-1:2018 - Steel flat products for pressure purposes - Technical delivery conditions - Part 1: General requirements defines the general delivery and inspection framework for steel flat products (plate, sheet and strip) used principally in the construction of pressure equipment. It is the fourth edition (2018) and complements the part-specific requirements in other ISO 9328 parts. The general technical delivery requirements of ISO 404 also apply to products supplied under this standard.

Key topics and technical requirements

ISO 9328-1:2018 covers the essential technical and administrative elements suppliers and purchasers must agree on before delivery:

• Scope and classification: Defines which steel flat products and steel grades are covered and how they are designated (referencing ISO/TS 4949 and ISO 4948 series).
• Information to be supplied by the purchaser: Mandatory order data such as quantity, product type (plate/sheet/strip), applicable ISO 9328 part, steel name, nominal dimensions, delivery condition and required inspection document.
• Material and processing requirements: Steelmaking process and specified delivery conditions (e.g., normalized, thermomechanically rolled, quenched and tempered).
• Chemical composition and analyses: Requirements for cast (heat) and product analysis and applicable sampling methods.
• Mechanical properties: Tensile properties at room and elevated temperature, impact toughness where required, and conversion of elongation values.
• Surface condition and internal soundness: Surface finish expectations and nondestructive testing (e.g., ultrasonic testing for thickness ≥ 6 mm).
• Dimensions and tolerances: Reference to tolerances and shape standards for flat products (e.g., ISO 7452, ISO 9034, ISO 9444/9445 series).
• Inspection, sampling and testing: Types of inspection documents, sampling frequency, preparation of test pieces, and test methods (tensile, Charpy impact, chemical analysis, ultrasonic).
• Marking and documentation: Requirements for product marking and delivery paperwork.

Notable editorial changes in 2018 include use of “nominal thickness” for thickness designations and an increase to 12 mm for impact test-piece thickness.

Applications and users

ISO 9328-1 is intended for anyone involved in specifying, procuring, manufacturing, inspecting or certifying steel flat products for pressure equipment, including:

• Pressure equipment manufacturers and designers
• Steel producers and processors (plate/strip mills)
• Quality and inspection engineers
• Procurement and specification writers for boilers, pressure vessels, piping and heat exchangers
• Third‑party inspectors and testing laboratories

Using ISO 9328-1 helps ensure material conformity for safety-critical pressure applications and clarifies buyer–seller responsibilities.

Related standards

• ISO 404 (general technical delivery requirements)
• ISO 9328 series Parts 2–7 (material-specific delivery conditions)
• Test-method standards: ISO 148-1 (Charpy), ISO 6892-1/2 (tensile), ISO 17577 (ultrasonic)
• Tolerances and finishing: ISO 7452, ISO 9034, ISO 9444/9445 series

Keywords: ISO 9328-1:2018, steel flat products, technical delivery conditions, pressure equipment, steel plate, steel sheet, steel strip, inspection, chemical composition, mechanical properties.