BS 10263-3:2017 pdf download – Steel rod, bars and wire for cold heading and cold extrusion Part 3: Technical delivery conditions for case hardening steels
1 Scope
1.1This part of EN 10263 is applicable to round rod, round bars and wire with a diameter up to andincluding 100 mm, of non-alloy and alloy steel, intended for cold heading and cold extrusion and casehardening.
1.2 EN 10263-1:2017 is indispensable for this part of EN 10263.Normative references
The following documents, in whole or in part, are normatively referenced in this document and areindispensable for its application.For dated references,only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including any amendments) applies.
EN 10020, Definition and classification of grades of steel
EN 10263-1:2017,Steel rod,bars and wire for cold heading and cold extrusion — Part 1: Generaltechnical delivery conditions
3Terms and definitions
For the purposes of this document, the terms and definitions given in EN 10263-1:2017 and thefollowing apply.
case-hardening steels
structural steels with a relatively low carbon content, which are carburized or carbonitrided on theirsurface and subsequently hardened
Note 1 to entry: These steels,after hardening, have a high degree of hardness in the surface zone and goodresistance to wear, while the core material is characterized principally by extreme toughness.
Note 2 to entry: Further possibilities for heat treatment of case-hardening steels are, for example,nitrocarburizingand nitriding.
4Classification and Designation4.1 Classification
All steels covered by this part of EN 10263 are special steels according to EN 10020.
Steel grades from C10E2C to C20E2C as quoted in Table 3 are non-alloy steels and all others are alloysteels according to EN 10020.
4.2 Designation
See EN 10263-1:2017.
5 Production process
5.1 Steelmaking process
See EN 10263-1:2017.
5.2 Deoxidation
All steels quoted in Table 3 shall be deoxidised.
6 Requirements
6.1 Delivery conditions
The delivery conditions in which the products covered by this part of EN 10263 are normally supplied,the product forms and the applicable requirements are given in Tables 1 and 2.
6.2 Chemical composition
6.2.1 Cast analysis
The chemical composition shall be in accordance with the values specified in Table 3 for the castanalysis.
6.2.2 Product analysis
In cases where a product analysis is requested, the admissible deviations from the values specified forthe cast analysis are indicated in Table 4.
6.3 Mechanical properties
The mechanical properties of the products, to be determined by the tensile test or hardness test, shallbe in accordance with Tables 5, 6 and 7 but by consideration of the prescriptions given in Table 1 and ofthe delivery conditions given in Table 2.
6.4 Hardenability
6.4.1 In the case of products ordered with standard requirements regarding hardenability, that is,when the steel names or numbers as quoted in Table 3 are supplemented by the symbols ” +H”, thehardness values obtained in the end quench test (Jominy test)(see Table 1 of EN 10263-1:2017) shallbe in compliance with the values given in Table 8.
6.4.2 In the case of products ordered with restricted requirements regarding the scatter bands of thehardness values obtained by the Jominy test, that is when the steel name or number as quoted inTable 3 is supplemented by the symbol“+HH”or“+HL”,the above hardness values shall be incompliance with the values given in Table 9.
NOTE1 The symbol “+HH” denotes that the upper limit of the scatter band coincides with the upper limit forthe corresponding steel “+H”.
NOTE2 The symbol ” +HL” denotes that the lower limit of the scatter band coincides with the lower limit for thecorresponding steel “+H”.
NOTE3 See EN 10263-1:2017,7.7.4 and 10.2
6.4.3 The austenizing temperatures for the Jominy test are given in Tables 8 and 9.
6.5 Surface quality
For any particular surface requirement to be agreed at the time of ordering see EN 10263-1:2017, 7.10.
6.6 Supplementary or special requirements
Other requirements that can be agreed at the time of enquiry and order are described in Annex A of EN 10263-1:2017.BS 10263-3 pdf download.