ISO 9444-2:2009

Overview

ISO 9444-2:2009 - Continuously hot-rolled stainless steel - Tolerances on dimensions and form - Part 2: Wide strip and sheet/plate specifies dimensional and form tolerances for continuously hot‑rolled stainless steel wide strip (actual widths from 600 mm to 2 500 mm) and sheet/plate cut from such strip. The standard defines required information for orders, delivery conditions, specific tolerance tables, measurement methods and permissible coil form.

Keywords: ISO 9444-2:2009, continuously hot-rolled stainless steel, wide strip tolerances, sheet/plate tolerances, thickness tolerance, flatness, edge camber, squareness.

Key topics and technical requirements

• Scope and delivery: Applies to hot‑rolled wide strip and sheet/plate cut from it; delivery condition normally as‑rolled (U) unless annealed/descaled agreed. Purchaser must specify thickness, width, edge condition (mill or trimmed), ends, length and any special conditions.
• Tolerances on thickness: Tabulated tolerances depend on specified thickness and nominal width (different bands for widths ≤1 400 mm and >1 400 mm up to 2 500 mm). Tolerances include crown; tighter coil thickness uniformity values are provided when material is intended for cold rolling.
• Tolerances on width and length: Width tolerances differ for mill (as‑rolled) and trimmed (slit) edges. Length tolerances are given by specified length bands (for example, typical tolerance +10 / 0 mm for lengths < 2 000 mm).
• Flatness, edge camber and squareness: Flatness limits are tabulated by thickness/width ranges (typical flatness band examples appear in the standard). Edge camber limits: up to 20 mm for mill edges and 15 mm for trimmed edges over any 5 000 mm length; for sheets < 5 000 mm the camber limit is 0.5% of specified length. Out‑of‑squareness is limited to 1% of the specified width.
• Coil form: Coils shall be tightly wound and as round as possible; permitted radial displacement of coil edges: 35 mm (trimmed) and 70 mm (mill edges).
• Measurement rules: Specifies how and where to measure thickness (minimum distances from edges: 40 mm for mill edges, 25 mm for trimmed), width (perpendicular to rolling direction), length, edge camber and squareness.

Applications and users

ISO 9444-2:2009 is used by:

• Manufacturers and mills producing continuously hot‑rolled stainless steel wide strip and sheet/plate (to define delivery tolerances and measurement methods).
• Purchasing/specification engineers and quality inspectors in automotive, appliance, construction, chemical and pressure‑equipment industries that require controlled dimensional/form tolerances.
• Coil processors, slitting services and cold‑rolling suppliers who need defined thickness uniformity and form limits.

Practical benefits: ensures clear contractual tolerances, consistent inspection criteria, fewer disputes on deliveries and smoother downstream processing (slitting, cold rolling, forming).

Related standards

• ISO 9444-1 (Part 1: Narrow strip and cut lengths) - companion part for narrower widths.
• ISO 6929 - referenced for product definitions and classification.