ISO 9328-2:2018

Overview

ISO 9328-2:2018 - "Steel flat products for pressure purposes - Technical delivery conditions - Part 2" defines the technical delivery conditions for plates and strip used in pressure equipment made from non‑alloy and alloy steels with specified elevated temperature properties. It complements ISO 9328-1 (general requirements) and provides grade‑specific chemical, mechanical and delivery‑condition requirements (see Annexes A and B).

Key topics and technical requirements

• Scope and applicability: Applies to plates and strip for pressure equipment; steel grades and limits are listed in Tables A.1 and B.1. Definitions and general requirements of ISO 9328‑1 apply.
• Classification & designation: Differentiates non‑alloy grades (e.g., P235GH, P265GH, P295GH, P355GH, PT410GH, PT450GH) from alloyed special steels, with designation rules per ISO 9328‑1.
• Delivery conditions: Default and optional delivery conditions include normalized (+N), normalized and tempered (+NT), quenched & tempered (+QT) and untreated (+AR). Normalizing rolling and simulated heat‑treatment tests are covered.
• Chemical composition & product analysis: Requirements per cast (heat) analysis in Tables A.1/B.1, with permitted product analysis deviations.
• Mechanical properties & testing: Tensile, yield and impact requirements at ambient and elevated temperatures; options for mid‑thickness test pieces and impact energy values.
• Special tests & integrity checks: Hydrogen‑induced cracking (Annex G), step‑cooling (Annex H), weldability requirements, resistance to hydrogen‑induced cracking and embrittlement of CrMo steels.
• Inspection, sampling & marking: Types of inspection documents (inspection certificate 3.1 per ISO 10474 is an example), sampling plans, retests, sorting and marking rules.
• Informative annexes: Cross‑references to EN/ASTM/ASME/JIS equivalents (Annex C), heat‑treatment guidelines (Annex D), time‑temperature parameters and creep reference data (Annexes E and F).

Practical applications and who uses it

ISO 9328-2 is intended for:

• Steel producers and mills supplying plates and strip for pressure vessels, boilers, heat exchangers and piping where elevated temperature performance is required.
• Fabricators and welders specifying delivery conditions and verifying material suitability after heat treatment.
• Procurement and quality managers establishing technical delivery conditions in purchase orders.
• Inspectors, testing laboratories and certification bodies performing compositional and mechanical testing, HIC and step‑cooling evaluations.
• Design engineers referencing material properties for high‑temperature pressure equipment compliance.

Related standards

• ISO 9328-1 - General delivery conditions for steel flat products for pressure purposes
• ISO 4948‑1 / ISO 4948‑2 - Steel classification standards
• ISO 10474 - Inspection certificates for steel products
• Regional and material standards referenced in annexes: EN 10028‑2, ASTM/ASME, JIS

Keywords: ISO 9328-2, steel flat products, pressure equipment, elevated temperature properties, technical delivery conditions, plates and strip, P235GH, 16Mo3, hydrogen‑induced cracking, heat treatment, inspection certificate.