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: 20.09.2020
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This part of ISO 7539 covers procedures for designing, preparing and using pre-cracked specimens for investigating the susceptibility of metal to stress corrosion cracking by means of tests conducted under rising load or rising displacement.  Tests conducted under constant load or constant displacement are dealt with in ISO 7539-6.

The term "metal" as used in this part of ISO 7539 includes alloys.

1.2       Because of the need to confine plasticity at the crack tip, pre-cracked specimens are not suitable for the evaluation of thin products such as sheet or wire and are generally used for thicker products including plate, bar, and forgings. They can also be used for parts joined by welding.

1.3       Pre-cracked specimens may be stressed quantitatively with equipment for application of a monotonically increasing load or displacement at the loading points.

1.4       A particular advantage of pre-cracked specimens is that they allow data to be acquired from which critical defect sizes, above which stress corrosion cracking may occur, can be estimated for components of known geometry subjected to known stresses. They also enable rates of stress corrosion crack propagation to be determined.

1.5       A principal advantage of the test is that it takes account of the potential impact of dynamic straining on the threshold for stress corrosion cracking.

1.6       At sufficiently low loading rates, the KISCC determined by this method can be less than or equal to that obtained by constant load or displacemenet methods and can be determined more rapidly.

Oblast zaměření: Ocel
Komise : CEN/TC 459/SC 5 (Steels for heat treatment, alloy steels, free-cutting steels and stainless steels)
Původce: CEN
K připomínkám do: 22.09.2020
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This document specifies the technical delivery conditions for cold rolled narrow steel strip made of non alloy and alloy steel grades in the form of coils and cut lengths in rolling widths less than 600 mm. Cold rolled narrow steel strip is available in grades of case hardening steel and of steels for quenching and tempering for general and special applications particularily springs.

—    Case hardening steels in thicknesses up to and including 10 mm;

—    Steels for quenching and tempering in thicknesses up to and including 6 mm in the conditions annealed (+A), annealed and skin passed (+LC) or cold rolled (+CR);

—    Steels in the quenched and tempered condition (+QT) in thicknesses between 0,30 mm and 3,00 mm.

In special cases supplementary requirements or deviations with respect to this document can be agreed between the purchaser and the supplier at the time of enquiry and order (see 5.2 and Annex A).

In addition to the requirements of this document, the general technical delivery requirements specified in EN 10021 apply.

This document does not cover cold rolled flat products for which separate standards exist, e.g.:

—    Cold rolled uncoated low carbon steel narrow strip for cold forming (EN 10139);

—    Cold rolled steel flat products with higher yield strength for cold forming (EN 10268).

Oblast zaměření: Svařování
Komise : CEN/TC 121 (Welding and allied processes)
Původce: CEN
K připomínkám do: 5.10.2020
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This International Standard specifies additional requirements to those given in ISO 5826 for single-phase transformers for a.c. welding.

The requirements of ISO 5826 shall be followed unless amended by this International Standard.

Annex A of this International Standard is for information only.

Oblast zaměření: Lehké slitiny
Komise : CEN/TC 132 (Aluminium and aluminium alloys)
Původce: CEN
K připomínkám do: 12.10.2020
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This document specifies the tolerances on dimensions and form of wrought aluminium and aluminium alloy forging stock.

It applies to extruded and rolled products.

Oblast zaměření: Drahé kovy
Komise : CEN/SS M21 (Precious metals)
Původce: CEN
K připomínkám do: 17.10.2020
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This document specifies a cupellation method (fire assay) for the determination of gold on a material considered homogeneous. The gold content of the sample should preferably lie between 100 and 999,5 parts per thousand (‰). Finenesses above 999,5 ‰ can be determined using a spectroscopy method by difference (e.g. ISO 15093).

The procedure is applicable to most types of gold samples. Some modifications are indicated for specific cases (presence of large amount of base metals, platinum or palladium, silver). It is not compatible with the presence above trace levels of iridium, rhodium and ruthenium (more than 0.25 ‰ for the sum of all three elements).

This method is also intended to be used as the recommended method for the determination of fineness in jewellery alloys covered by ISO 9202.

Oblast zaměření: Kovové povlaky
Komise : CEN/TC 240 (Thermal spraying and thermally sprayed coatings)
Původce: CEN
K připomínkám do: 19.10.2020
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This International standard specifies quality requirements for manufacturers of thermal sprayed coatings, which should ensure quality assurance for activities in the field of production.

Note:        It is independent of the availability of a quality management system according to the ISO 9000, ISO 14000 series and ISO 45001, which deals with the concept and organization of the quality management.

This standard should be applied for thermal spraying including all the pre- and post-treatments of the whole coating process for new parts, for repairs and maintenance (e.g. after service) at the workshop or on site. This standard defines the quality requirements, which are of importance for the manufacturing route.

The main elements of the quality assurance of the entire thermal spraying process for different applications according to Quality Assurance Levels C, S and E are listed in the Annex of this standard. They can be used to check the proper function of the quality assurance system when applying a quality audit.

This standard specifies requirements, tests and the scope of tests when qualifying the manufacturer. The specific requirements of the qualifying procedure according to the Quality Assurance Level C, S or E can be given by the general requirements of the quality management system of the company or a contract.

This standard together with the relevant Quality Level can be stipulated by the customer/designer, in order to require a minimum of quality assurance measures for the manufacturing of his component.

Requirements specified in this standard can be helpful when a quality assurance system is to be established.