Metallurgi

Kommittébeteckning: SIS/TK 142 (Konstruktionsstål)
Källa: ISO
Svarsdatum: den 5 okt 2020
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This document specifies delivery requirements which apply to the surface finish of hot-rolled plates and wide flats rolled on reversing mills, with nominal thickness ≥ 3 mm and ≤ 400 mm.

For plates with a nominal thickness greater than 400 mm and for special applications for which a different surface condition is required, special agreements shall be made at the time of enquiry and order.

Kommittébeteckning: SIS/TK 142 (Konstruktionsstål)
Källa: CEN
Svarsdatum: den 5 okt 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).

Ämnesområden: Korrosion
Kommittébeteckning: SIS/TK 146 (Korrosion)
Källa: CEN
Svarsdatum: den 11 okt 2020
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1.1 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.

Kommittébeteckning: SIS/TK 146 (Korrosion)
Källa: CEN
Svarsdatum: den 28 okt 2020
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This document specifies protection criteria for determining the AC corrosion risk of cathodically protected pipelines.

It is applicable to buried cathodically protected pipelines that are influenced by AC traction systems and/or AC power lines.

In the presence of AC interference, the protection criteria given in ISO 15589-1 are not sufficient to demonstrate that the steel is being protected against corrosion.

This document provides limits, measurement procedures, mitigation measures, and information to deal with long-term AC interference for AC voltages at frequencies between 16,7 Hz and 60 Hz and the evaluation of AC corrosion likelihood.

This document deals with the possibility of AC corrosion of metallic pipelines due to AC interferences caused by conductive, inductive or capacitive coupling with AC power systems and the maximum tolerable limits of these interference effects. It takes into account the fact that this is a long-term effect, which occurs during normal operating conditions of the AC power system.

This document does not cover the safety issues associated with AC voltages on pipelines. These are covered in national standards and regulations (see, e.g., EN 50443).

Ämnesområden: Aluminiumprodukter
Kommittébeteckning: SIS/TK 129 (Lättmetaller)
Källa: CEN
Svarsdatum: den 29 okt 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.

Kommittébeteckning: SIS/TK 122 (Kemiska analysmetoder för metaller)
Källa: ISO
Svarsdatum: den 30 okt 2020
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This document specifies a method for the determination of phosphorus, manganese, chromium, copper and cobalt contents in ferronickels, by inductively coupled plasma optical emission spectrometry, within the ranges specified in Table 1.

This method is applicable to all kinds of ferronickels specified in ISO 6501.