ISO 9445-1:2009

Overview

ISO 9445-1:2009 - Continuously cold-rolled stainless steel - Tolerances on dimensions and form - Part 1: Narrow strip and cut lengths specifies dimensional and form tolerances for continuously cold-rolled stainless steel narrow strip (rolling widths < 600 mm) and cut lengths taken from that strip. The standard covers thicknesses up to and including 3 mm, measurement methods, delivery conditions and ordering information. ISO 9445-1 complements ISO 9445-2 (wide strip and plate/sheet) and replaces the earlier ISO 9445:2002.

Key topics and technical requirements

• Scope limits: Applies to continuously cold-rolled stainless steel narrow strip and cut lengths with widths < 600 mm and thickness ≤ 3 mm. Strip manufactured from wide strip by longitudinal slitting is addressed in ISO 9445-2.
• Purchaser information: Buyers must specify delivery type, standard reference (ISO 9445-1), thickness and width (with code letters for normal, fine (F) or precision (P) tolerances), and optional codes for restricted edge camber (R), special length (S) and special flatness (FS).
• Tolerances:
  • Thickness tolerances: Detailed tabulated tolerances by nominal thickness and width categories (normal, fine, precision).
  • Width tolerances: Tabulated positive/negative tolerances by thickness and width ranges.
  • Length tolerances for cut lengths (normal and special).
  • Edge camber: Allowed camber by width and measuring length; restricted (R) option for tighter control.
  • Squareness: Out-of-squareness limits (≤ 0.5% for widths ≥ 250 mm; to be agreed for narrower widths).
  • Flatness: Maximum flatness deviation for cut lengths (normal and FS special).
  • Edge waviness: Limits on h/l ratio depending on thickness and processing (skin-passed or stretch-levelled).
• Delivery and form: Typical supply with cut edges (burrs allowed up to 10% of thickness unless otherwise agreed); possible special edge treatments (deburred, rounded). Coil inner diameters commonly ~300, 400, 500, 600 mm.
• Measurement methods: Specifies where and how to measure thickness, width, length, edge camber, squareness, flatness and waviness (e.g., thickness measured at least 10 mm from edges; for widths ≤ 20 mm measure at centre).

Applications and users

ISO 9445-1 is used by:

• Stainless steel manufacturers and cold-rolling mills for consistent production tolerances.
• Purchasers and specifiers to define delivery and quality requirements in orders and contracts.
• Quality / inspection engineers and metallurgical labs to verify conformance to dimensional and form tolerances.
• Fabricators and component manufacturers who work with narrow strip and cut lengths in applications such as precision components, electrical parts, appliances and other industries requiring tight dimensional control.

Related standards

• ISO 9445-2 - Wide strip and plate/sheet (complements Part 1).
• ISO 6929 - Steel products - Definitions and classification (terms/definitions used by ISO 9445-1).

Keywords: ISO 9445-1:2009, continuously cold-rolled stainless steel, narrow strip, cut lengths, tolerances, thickness tolerances, width tolerances, edge camber, flatness, squareness, measurement methods.