Kovové materiály

Oblast zaměření: Kovové koroze
Komise : CEN/TC 262 (Metallic and other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys)
Původce: CEN
K připomínkám do: 6.03.2020
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This document specifies procedures for the removal of corrosion products formed on metal and alloy corrosion test specimens during their exposure in corrosive environments. For the purpose of this document, the term "metals" refers to pure metals and alloys.

The specified procedures are designed to remove all corrosion products without significant removal of base metal. This allows an accurate determination of the mass loss of the metal, which occurred during exposure to the corrosive environment.

These procedures may, in some cases, also be applied to metal coatings. However, possible effects from the substrate must be considered.

NOTE       If a significant portion of the substrate is visible after the pickling procedure is completed, the results will be unreliable.

Oblast zaměření: Prášková metalurgie
Komise : CEN/SS M11 (Powder metallurgy)
Původce: CEN
K připomínkám do: 9.03.2020
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This International Standard specifies a generic test method to determine the abrasion wear characteristics of hardmetals.

The procedure complements the ASTM G65 method for dry sand/rubber wheel abrasion, the ASTM B611 method for determining the high stress abrasion of hard materials, and the ASTM G105 method for conducting wet sand/rubber wheel abrasion tests.

The test is appropriate for use in situations where test laboratories have a need to simulate abrasive damage. The procedure includes information which enables the test to be used in a variety of different conditions:

a)    with counterface wheels of different stiffness (for example steel and rubber);

b)   wet and dry;

c)    different abrasive sizes;

d)    different chemical environments.

Oblast zaměření: Svařování
Komise : CEN/TC 121 (Welding and allied processes)
Původce: CEN
K připomínkám do: 27.03.2020
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This International Standard specifies requirements for resistance spot welding in the fabrication of assemblies of aluminium sheet, extrusions (both work- and age-hardening alloys) and/or cast material comprising two or three thicknesses of metal, where the maximum single (sheet) thickness of components to be welded is within the range 0,6 mm to 6 mm.

This International Standard is applicable to the welding of sheets or plates of dissimilar thickness where the thickness ratio is less than or equal to 3 : 1. It applies to the welding of three thicknesses where the total thickness is less than or equal to 9 mm.

Welding with the following types of machines is within the scope of this International Standard:

—    pedestal welding machines;

—    gun welders;

—    automatic welding equipment where the components are fed by robots or automatic feeding equipment;

—    multi-welders;

—    robotic welders.

Information on appropriate welding equipment is given in Annex A and on spot welding conditions in Annex B. The latter are for guidance only and may require modification depending on service conditions of the fabrication, type of welding equipment, characteristics of the secondary circuit, electrode material and geometry.

The welding of coated material, e.g. zinc-coated or anodised material, is not within the scope of this International Standard.

Oblast zaměření: Měď
Komise : CEN/TC 133 (Copper and copper alloys)
Původce: CEN
K připomínkám do: 30.03.2020
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This document specifies methods for assessing the tin coating on drawn round copper wire for the manufacture of electrical conductors, e.g. according to EN 13602.

This document includes test methods for the determination of the following characteristics:

a)     thickness of the unalloyed tin coating;

b)    continuity of the tin coating;

c)     adherence of the tin coating.

WARNING — This document can involve the use of hazardous materials, operations, and equipment. This document does not purport to address all of the safety problems associated with their use. It is the responsibility of the user of this document to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Moreover this document does not cover the aspects related to the people protection against the X-ray. To obtain information applicable to this aspect it is convenient to refer to national and international standards, and also to the local regulations if they exist.

Oblast zaměření: Měď
Komise : CEN/TC 133 (Copper and copper alloys)
Původce: CEN
K připomínkám do: 30.03.2020
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This document specifies the composition, property requirements including electrical properties, and tolerances on dimensions and form for copper rod, bar and wire for general electrical purposes. Cross-sections and size ranges are:

•       round, square and hexagonal rod with diameters or widths across-flats from 2 mm up to and including 160 mm;

•       bar with thicknesses from 2 mm up to and including 40 mm and widths from 3 mm up to and including 250 mm;

•       round, square, hexagonal and rectangular wire with diameters or widths across-flats from 2 mm up to and including 25 mm, as well as thicknesses from 0,5 mm up to and including 12 mm with widths from 1 mm up to and including 250 mm.

The sampling procedures and test methods for verification of conformity to the requirements of this document are also specified.

NOTE          Drawn, round copper wire — plain or tinned, single or multiline — for the manufacture of electrical conductors is specified in EN 13602.

Oblast zaměření: Měď
Komise : CEN/TC 133 (Copper and copper alloys)
Původce: CEN
K připomínkám do: 30.03.2020
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This document specifies the composition, property requirements including electrical properties, and tolerances on dimensions and form for copper profiles and profiled wire for electrical purposes, which would fit within a circumscribing circle of maximum 180 mm diameter.

The sampling procedures, the test methods for verification of conformity to the requirements of this document, and the delivery conditions are also specified.

Oblast zaměření: Ocel
Komise : CEN/TC 192 (Fire service equipment)
Původce: CEN
K připomínkám do: 1.04.2020
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This document gives requirements and test methods for rubber and plastics suction hoses for fire‑fighting purposes.

NOTE 1   All pressures are expressed in megapascals and in bar. 1 MPa = 10 bar.

Additional requirements are specified for hose assemblies, that is, hoses with couplings already fitted, where this is carried out by the hose manufacturer (see clause 8).

Type A (Rubber) hoses are intended for use at a minimum temperature of ‑20 °C and Type B (Thermoplastics) hoses are intended for use at a minimum temperature of ‑10 °C.

NOTE 2   Hoses for use at temperatures lower than those specified above can be supplied by agreement between the manufacturer and purchaser. In this case, the low temperature flexibility test (see 6.3) should be carried out at the specified temperature.