BS EN 10267:1998 pdf download.Ferritic-pearlitic steels for precipitation hardening from hot-working temperatures.
1.1 This European Standard gives the technical delivery requirements for senii-finished products and bars of the non-alloy special steels listed in Tables 3 and 5. The products are sipplied in the conditions given in Table 1, line 2 to 4, and in one of the surface conditions given in Table 2.
1.2 th special cases, variations in these tedmical delivery requirements or additions to them may form the subject of an agreement at the time of enquiry and order (see annex A).
1.3 In addition to the specifications of this European Standard, the general technical delivery requirements of EN 10021 are applicable, unless otherwise specified.
4 Classification and designation
4.1 Classification
All steels covered by this European Standard are classified as non-alloy special steels according to EN10020.
4.2 Designation
4.2.1 Steel names
For the steel grades covered by this European Standard, the steel names as given in Tables 3 and 5 are allocated in accordance with EN 10027-1 and CR 10260.
4.2.2 Steel numbers
For the steel grades covered by this European Standard, the steel numbers as given in Tables 3 and 5 are allocated in accordance with EN10027-2.
7 Requirements
7.1 Chemical composition and mechanical properties
7.1.1 Where the products are to be delivered in th
untreated condition, the requirements for chemical composition given in Tables 3 and 4 apply. In addition for products to be delivered in the condition “treated for cold shearing, a maximum Brinell hardness
of 255 applies.
NOTE Guidance data for mechanical properties of hot forgings after precipitation hardening are given in Table B.1.
7.1.2 Where the products are to be delivered in the precipitation hardened condition, the requirements for mechanical properties given in Table 5 apply
NOTE: In this case, the chemical composition given in Table 3 is for guidance only.
7.2 Structure
7.2.1 Steels in Table 5 are control-cooled from the hot-working temperature to produce a ferritic-pearlitic structure. Under certain circumstances, small portions of bainite and/or martensite may be present.BS EN 10267:1998 pdf download.