Measurement of roughness average Ra and peak count RPc on metallic flat products

This European Standard defines the measurement conditions for surface roughness parameters of metallic flat products, both uncoated (cold and hot rolled pickled steel) and coated with metallic coatings (e.g. zinc, aluminium, tin, chromium) (see 3.1).

Messung des arithmetischen Mittenrauwertes Ra und der Spitzenzahl RPc an metallischen Flacherzeugnissen

Diese Europäische Norm legt die Prüfbedingungen fest für die Rauheitskenngrößen der Oberflächen von metallischen Flacherzeugnissen, beide ohne Überzug (kalt- und warmgewalzter gebeizter Stahl) und mit metallischen Überzügen (z. B. Zink, Aluminium, Zinn, Chrom) siehe 3.1.

Mesure de la rugosité moyenne Ra et du nombre de pics RPc sur les produits plats métalliques

La présente Norme européenne définit les conditions de mesure des paramètres de rugosité de surface pour les produits plats métalliques, à la fois non revêtus (aciers décapés laminés à chaud et à froid) et revêtus avec des revêtements métalliques (par exemple  zinc, aluminium, étain, chrome) (voir paragraphe 3.1).

Meritve srednje vrednosti hrapavosti Ra in števila konic RPc na ravnih kovinskih izdelkih

Ta evropski standard določa pogoje za meritve parametrov površinske hrapavosti na ravnih kovinskih izdelkih, tako neprevlečenih (mrzlo in vroče valjano luženo jeklo) kot prevlečenih s kovinskimi prevlekami (npr. s cinkom, aluminijem, kositrom, kromom).

General Information

Status
Published
Publication Date
06-May-2014
ICS
17.040.20 - Properties of surfaces
 
77.140.50 - Flat steel products and semi-products
Technical Committee
IFEK - Ferrous metals
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-May-2014
Due Date
12-Jul-2014
Completion Date
07-May-2014
Ref Project
EN 10049:2013 - Measurement of roughness average Ra and peak count RPc on metallic flat products

Relations

Replaces
SIST EN 10049:2006 - Measurement of roughness average Ra and peak count RPc on metallic flat products
Effective Date
01-Jun-2014

Overview

EN 10049:2013 is a CEN European Standard that defines measurement conditions for surface roughness on metallic flat products. It specifies how to measure the roughness average (Ra) and the peak count (RPc) on both uncoated (cold- and hot-rolled pickled steel) and metallic-coated surfaces (e.g., zinc, aluminium, tin, chromium). The standard aims to provide practical, reproducible rules tailored to flat steel products where generic ISO procedures can be impractical.

Key Topics and Requirements

  • Parameters covered: Ra (arithmetical mean of absolute deviations) and RPc (number of profile peaks per cm over the evaluation length).
  • Application groups:
    • Group 1 - products mainly for automotive use (uncoated or metallic coated).
    • Group 2 - other flat products (e.g., tinplate, packaging steels, pickled hot-rolled).
  • Measuring instruments: Stylus instruments conforming to EN ISO 3274 or optical roughness systems aligned to stylus reference values.
  • Stylus geometry: Cone angle α = 90° (+5 / -10); tip radius r = 5 ± 1 µm.
  • Datum/pick-up system: Double-skid (typical skid dimensions: Rs,x = 50 mm; Rs,y = 3 mm; SA = 4.5 mm; AB = 13 mm) or single skid by agreement.
  • Filters and transmission band: Gaussian profile filter per EN ISO 16610-21; transmission band λc/λs = 300/1.
  • Cut-off (λc) and evaluation length:
    • Group 1: λc = 2.5 mm
    • Group 2: λc = 0.8 mm
    • Evaluation length lm = 5 × λc
  • Sampling & speed: Maximum sampling spacing 1,6 µm (Group 1) and 0,5 µm (Group 2); measuring speed ≤ 1 mm/s; maximum force 1 mN.
  • Calibration & checks: Use a calibrated roughness standard specimen type D (EN ISO 5436-1).
  • Reporting: Test report must cite this standard and record measuring head type, λc, measuring direction, mean Ra, mean RPc (if required), and any deviations from prescribed conditions.

Applications and Who Uses It

EN 10049:2013 is used by:

  • Steel and coated-metal producers for quality control of flat products.
  • Automotive OEMs and tier suppliers specifying surface finish for paint/appearance.
  • Packaging manufacturers (tinplate/chrome) and surface-coating process engineers.
  • Metrology laboratories and inspection personnel performing contractual or dispute measurements.

Practical benefits include consistent Ra/RPc data for acceptance criteria, clearer supplier–buyer communication, and a defined dispute procedure (e.g., use of datum-based stylus instruments and reference standards).

Related Standards

  • EN ISO 3274 (stylus instrument characteristics)
  • EN ISO 4287 / 4288 (surface texture terms and assessment rules)
  • EN ISO 5436-1 (measurement standards - material measures)
  • EN ISO 16610-21 (Gaussian profile filters)

Keywords: EN 10049:2013, surface roughness measurement, Ra, RPc, metallic flat products, stylus instrument, cut-off λc, automotive surface finish.

Frequently Asked Questions

SIST EN 10049:2014 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Measurement of roughness average Ra and peak count RPc on metallic flat products". This standard covers: This European Standard defines the measurement conditions for surface roughness parameters of metallic flat products, both uncoated (cold and hot rolled pickled steel) and coated with metallic coatings (e.g. zinc, aluminium, tin, chromium) (see 3.1).

This European Standard defines the measurement conditions for surface roughness parameters of metallic flat products, both uncoated (cold and hot rolled pickled steel) and coated with metallic coatings (e.g. zinc, aluminium, tin, chromium) (see 3.1).

SIST EN 10049:2014 is classified under the following ICS (International Classification for Standards) categories: 17.040.20 - Properties of surfaces; 77.140.50 - Flat steel products and semi-products. The ICS classification helps identify the subject area and facilitates finding related standards.

SIST EN 10049:2014 has the following relationships with other standards: It is inter standard links to SIST EN 10049:2006. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

SIST EN 10049:2014 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Meritve srednje vrednosti hrapavosti Ra in števila konic RPc na ravnih kovinskih izdelkihMessung des arithmetischen Mittenrauwertes Ra und der Spitzenzahl RPc an metallischen FlacherzeugnissenMesure de la rugosité moyenne Ra et du nombre de pics RPc sur les produits plats métalliquesMeasurement of roughness average Ra and peak count RPc on metallic flat products77.140.50SROL]GHONLFlat steel products and semi-products17.040.20Lastnosti površinProperties of surfacesICS:Ta slovenski standard je istoveten z:EN 10049:2013SIST EN 10049:2014en,fr,de01-junij-2014SIST EN 10049:2014SLOVENSKI
STANDARDSIST EN 10049:20061DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 10049
November 2013 ICS 01.040.17; 17.040.20 Supersedes EN 10049:2005
English Version
Measurement of roughness average Ra and peak count RPc on metallic flat products
Mesure de la rugosité moyenne Ra et du nombre de pics RPc sur les produits plats métalliques
Messung des arithmetischen Mittenrauwertes Ra und der Spitzenzahl RPc an metallischen Flacherzeugnissen This European Standard was approved by CEN on 29 August 2013.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 10049:2013: E SIST EN 10049:2014

- the practical use of EN ISO 4288 is not convenient for flat products, because the choice of the cut-off (λc) is dependent on the Ra to be measured; the product range is quite wide and the transition point for Ra is 2 µm in EN ISO 4288 (EN ISO stipulates a cut-off (λc) of 0,8 mm for Ra < 2µm and a cut-off (λc) of 2,5 mm for Ra > 2µm); - in the automotive industry, the use of a cut-off (λc) of 2,5 mm is based on requirements related to paint appearance. According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 5436-1, Geometrical Product Specifications (GPS) — Surface texture: Profile method; Measurement standards — Part 1: Material measures (ISO 5436-1) EN ISO 16610-21, Geometrical product specifications (GPS) — Filtration — Part 21: Linear profile filters: Gaussian filters (ISO 16610-21) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1
application group products
3.1.1
application group 1 product
metallic flat product mainly used in the automotive industry, uncoated or coated with metallic coatings (e.g. zinc, aluminium)
3.1.2 application group 2 product
metallic flat product mainly used for applications other than those of the automotive industry (e.g. tinplate or chromium coated steel for packaging, uncoated or coated cold rolled steel, pickled hot rolled steel) 3.2 surface profile profile that results from the intersection of the real surface by a specified plane
Note 1 to entry: See EN IS
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