Metallurgi

Kommittébeteckning: SIS/TK 122 (Kemiska analysmetoder för metaller)
Källa: CEN
Svarsdatum: den 21 feb 2018
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This document specifies a spectrophotometric method for the determination of nitrogen in steel .

The method is applicable to determination of nitrogen mass fraction between 0,000 6 % and 0,050 % in low alloy steels and between 0,01 % and 0,050 % in high alloy steels.

However, the method is not applicable to samples containing silicon nitride.

The method doesn't apply to samples having silicon contents > 0,6 %

Ämnesområden: Verktygsstål
Kommittébeteckning: SIS/TK 120 (Allmänna leveransbestämmelser för metall)
Källa: ISO
Svarsdatum: den 22 feb 2018
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This International Standard specifies guidelines and requirements for conducting life cycle inventory (LCI) studies of steel products reflecting steel’s unique nature of closed-loop recycling, including

a) functional unit used for LCI calculation of steel products

b) system boundaries used for LCI calculation of steel products

c) evaluation of scrap in LCI calculation of steel products

d) evaluation of co-products in LCI calculation of steel products

e) reporting of LCI calculation results of steel products

The application of LCI results, including Life Cycle Impact Assessment (LCIA) is outside the scope of this International Standard.

Kommittébeteckning: SIS/TK 123 (Mekanisk provning)
Källa: ISO
Svarsdatum: den 7 mar 2018
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This document specifies a test method for the determination of brittle crack arrest toughness and is applicable to ferritic steel base metals exhibiting ductile to brittle transition behaviour. Applicable materials are rolled steel plates. It is intended for materials with a tensile strength of 950 MPa or less and a test piece thickness of 200 mm or less. The range of arrest temperatures is between -196 °C and 100 °C. This document can be applied to flat rolled steel plates but not to flattened steel pipes because the flattening can cause changes in arrest toughness. Therefore, this document should not be used for pipes unless the influence of flattening is quantitatively predicted.

The test method may be summarized as follows: after setting a temperature gradient across the width of a test piece, and applying uniform stress to the test piece, strike the test piece to initiate a brittle crack from a mechanical notch in either edge of the test piece and cause crack arrest after propagating in the width direction (temperature gradient type arrest testing). Annex A shows typical devices and method of setting the temperature gradient on the piece. Using the stress intensity factor, calculate the arrest toughness, Kca, from the applied stress and the arrest crack length. This value is the arrest toughness at the temperature at the point of crack arrest (arrest temperature). To determine Kca at a specific temperature such as the design temperature of a structure, the method specified in Annex B may be used.

To check the validity of a crack propagation path, Annex C may be used to determine the stress intensity factor for a curved crack.

As a method for initiating a brittle crack, a secondary loading mechanism can be used (see Annex D). The arrest characteristics of the test piece can also be evaluated by welding a crack starter plate to the test plate in the width direction to enable a brittle crack initiated from the mechanical notch at the edge of the test piece to propagate in the crack running plate and observing the propagation behaviour of the crack immediately after entering the test plate (see Annex E)

To determine the dynamic behaviour of crack propagation and measure the dynamic strain of a test piece, the method explained in Annex F may be used.

Kommittébeteckning: SIS/TK 130 (Gjutet järn och stål)
Källa: CEN
Svarsdatum: den 12 mar 2018
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This document applies to corrosion resistant steel castings for general purposes.

This document relates to castings manufactured from martensitic, austenitic, fully austenitic and austenitic-ferritic steel grades characterized by their chemical composition (see Table 1) and mechanical properties (see Table 2).

ln cases where castings are joined by welding by the founder, this document applies.

ln cases where castings are welded

— to wrought products (plates, tubes, forgings),

— or by non-founders,

this document does not apply.

Ämnesområden: Gjut- och tackjärn
Kommittébeteckning: SIS/TK 130 (Gjutet järn och stål)
Källa: ISO
Svarsdatum: den 12 mar 2018
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This part of ISO 945 specifies test methods for determining nodularity of spheroidal graphite cast irons by comparative visual analysis and image analysis techniques.

This part of ISO 945 provides figures for different levels of nodularity, graphite particle size and graphite particle count of spheroidal graphite cast irons for visual analysis.

Ämnesområden: Pulvermetallurgi
Kommittébeteckning: SIS/TK 133 (Pulvermetallurgi)
Källa: SIS
Svarsdatum: den 25 mar 2018
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This standard specifies a gas chromatography and a mass spectrometry method of detecting the presence of argon in metal powder produced components, consolidated by hot isostatic pressing.

This standard specifies the calibration and functionality test for the equipment covered. It also specifies methods for sampling, sample preparation and sample test procedure of PM HIP components to detect argon presence.

Components produced by additive manufacturing are not covered in this standard.

Note It is the responsibility of the purchaser of the PM HIP service to specify in the purchase order if an argon detection test shall be made and if so, the desired argon limit shall be specified.

Kommittébeteckning: SIS/TK 129 (Lättmetaller)
Källa: CEN
Svarsdatum: den 10 apr 2018
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This document describes the criteria and operation procedure for carrying out spark optical emission spectrometry (S-OES) on metal samples. The scope of this standard covers the following:

— sample preparation;

— operational guidelines for an optical emission spectrometer (including self-maintenance);

— traceability of the analytical results to the international base units — mass (kg);

— assessing the uncertainty associated with each analytical result.

This document refers to simultaneous spark emission spectrometers for the analysis of solid samples.

It applies to the determination of silicon, iron, copper, manganese, magnesium, chromium, nickel, zinc, titanium, boron, gallium, vanadium, beryllium, bismuth, calcium, cadmium, cobalt, lithium, sodium, phosphorus, lead, antimony, tin, strontium and zirconium in aluminium and aluminium alloys.

The test result obtained from a spark optical emission spectrometer generally uses a sampling mass of less than one milligram per spark spot. The result can be used to refer to the laboratory test sample, to the aluminium or aluminium alloy melt or to the cast product.

Kommittébeteckning: SIS/TK 142 (Konstruktionsstål)
Källa: CEN
Svarsdatum: den 17 apr 2018
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