BS EN also available with tracked-changes. To learn more and buy, click HERE. This European standard is the last in a six-part series detailing technical delivery conditions for hot rolled structural steel products. The series is pivotal because it controls the majority of steel-frame-constructed buildings within the EU. This part deals with flat products of high yield strength structural steels in the quenched and tempered condition.
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A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. ICS Contents Page European foreword This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2 02 0 and conflicting national standards shall be withdrawn at the latest by February 2 02 0.
Attention is drawn to the possibility that some of the elements of this document may be the subj ect of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. For this short transition period up-to-the publication of the next edition of part 1 the following is to be taken into account for EN 1 5 -1 : 2 The grades and qualities are given in Tables 1 to 3 chemical composition and Tables 4 to 6 mechanical properties and are supplied in the quenched and tempered condition.
The steels specified in this document are applicable to hot-rolled flat products with a minimum nominal thickness of 3 mm and a maximum nominal thickness of 2 00 mm for grades S, S5 00, S5 5 0, S62 0 and S, a maximum nominal thickness of 12 5 mm for grades S and S, in steels which, after quenching and tempering, have a specified minimum yield strength of MPa to MPa.
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies. ISO and IEC maintain terminological databases for use in standardization at the following addresses:. They differ in their minimum yield strength at room temperature. All steel grades may be supplied in the following qualities as specified at the time of the order:. In the event that the purchaser does not indicate his wish to implement any of these options, the supplier shall supply in accordance with the basic specification, see 5.
See Option 1, Clause 1 3 details of manufacturing process. The usual guideline is a minimum aluminium to nitrogen ratio of 2 : 1 , when no other nitrogen binding elements are present. NOTE Direct quenching after hot-rolling followed by tempering is considered equivalent to conventional quenching and tempering.
For elements not defined in the table for the chemical composition for heat analysis, limit values of Table 1 of EN 0: 2 shall apply as maximum values. The product analysis shall be carried out when specified at the time of the order. For elements not defined in the table for the chemical composition for product analysis, limit values of Table 1 of EN 0: 2 shall apply as maximum values. For determining the carbon equivalent value the following IIW International Institute of Welding formula shall be used:.
As this temperature is normally not known in advance it is recommended that the purchaser if he intends to perform a stress relief treatment to contact the steel producer. If the purchaser intends to stress relief the products at higher temperatures or for longer times than mentioned above the minimum values of the mechanical properties after such a treatment should be agreed upon at the time of the order. See Option 24, Clause 13 Agreement on another impact test temperature.
See Option 13, Clause 13 For each heat treatment unit impact properties only to be verified. See Option 14, Clause 13 For each heat treatment unit impact and tensile properties to be verified. If agreed upon at the time of the order the products shall comply with one of the requirements of EN 1 See Option 4, Clause 1 3 Deformation properties perpendicular to the surface. The steels specified in this document do not have unlimited suitability for the various welding processes, since the behaviour of a steel during and after welding depends not only on the material but also on the dimensions and shape and on the manufacturing and service conditions of the components.
General requirements for arc welding of the steels specified in this document shall be as given in EN 1 NOTE With increasing product thickness and strength level cold cracking can occur.
Cold cracking is caused by the following factors in combination:. Hot forming is not recommended for quenched and tempered steels as the necessary heat treatment after hot forming is very difficult to reproduce. Furthermore it is important to draw the attention to the risk of brittle fracture in connection with hot-dip zinc coating.
See Option 11 , Clause 13 Flangeability without cracking. EN ISO 1 should be used to specify coating requirements. EN ISO 1 provides further guidance, including information on the influence of various factors, including steel chemical composition, on the coating formation. Option 5 , Clause 13 can be used to order steels with a chemical composition required for hot-dip zinc coating.
NOTE 1 EN ISO 1 3 -2 : 2 , Table 1 , gives guidance on typical coating characteristics associated with certain steel compositions on the basis of the surface composition of silicon and phosphorous. NOTE 2 Products quenched in water can be susceptible to stress corrosion cracking after hot-dip zinc-coating.
See Option 5, Clause 1 3 Chemical composition for hot dip zinc coating. In some cases steels above S may be sensitive to cracking during galvanizing and therefore special care should be taken. Class A, subclass 1 of EN shall apply, class B regarding grinding or subclasses 2 or 3 regarding repair by welding can be agreed upon at the time of the order. See Option 15, Clause 13 Other surface class for plates and wide flats. See Option 6, Clause 1 3 Ultrasonic testing for flat products. For hot rolled plate tolerances the basic requirements shall be in accordance with EN 1 9, including thickness tolerances to class A, unless otherwise agreed upon at the time of the order.
See Option 18, Clause 13 For plates other thickness tolerance than class A. For plates cut from continuously hot rolled strip, the thickness tolerances shall be in accordance with EN 1 1 , unless otherwise agreed upon at the time of the order. The manufacturer shall obtain from the purchaser which of the inspection documents specified in EN 1 02 04 is required.
NOTE Some application standards, e. EN 1 , require particular inspection documents according to EN 1 02 Unless otherwise agreed upon, steel grades of this standard are delivered with CE marking and they shall not only fulfil these technical delivery conditions, but the requirements of EN , too. It can be agreed upon at the time of enquiry and order to abstain from CE-marking, see Option 3 3, Clause 1 3, in this case EN 1 does not apply.
See Option 33, Clause 13 no application of CE-marking. CC03 identification of the sample, location of the sample, direction of the test pieces, test temperature;. C1 0-C1 3 shape of the test piece, yield or proof strength, tensile strength, elongation after fracture;. The heat analysis shall be determined once per cast.
If a product analysis has been agreed upon at the time of enquiry and order, the purchaser shall specify the frequency if not once per cast. The verification of the mechanical properties tensile strength, yield strength, impact energy and elongation shall be by test unit s from within each cast. Unless otherwise specified see 7.
The test unit shall contain products of the same form and grade and of the same thickness range for the yield strength requirement as given in Table 4. The nominal thickness of a product within the test unit shall not deviate more than 5 mm from that of the sample product.
The selection and preparation of samples for product analysis shall be in accordance with EN ISO 1 42 The samples shall be taken from any product of the test unit, from the location in the product as shown in Annex A.
Additionally for plates, sheet, wide strip and wide flats the samples shall be taken so that the axes of the test pieces are approximately midway between the edge and centre line of the products. In cases of dispute, the total thickness of the plate shall be subdivided in equal thick flat test pieces. The average of the individual results of the mechanical tests shall be valid.
In addition the following requirements apply for flat products:. The choice of a suitable physical or chemical analytical method for the analysis shall be at the discretion of the manufacturer. For the heat analysis the manufacturer shall report values of all elements defined in Table 1 for the steel grade concerned for each cast as well as of the elements for determining the carbon equivalent value.
For the product analysis, if not otherwise agreed upon, the manufacturer shall report values of all elements defined in Table 2 for the steel grade concerned, see Option 2 Clause 1 3. Test pieces may be non-proportional but in cases of dispute proportional test pieces having a gauge.
For normal testing, for reasons of economy, test pieces of a constant measuring length may be used provided the result obtained for elongation after fracture is converted by the formula in EN ISO 2 5 The average value of the three test results shall meet the specified requirement. Three additional test pieces shall be taken from the same sample in accordance with 9. The average value of the six tests shall be not less than the minimum average value specified. In the case of strip, retests on a rej ected coil shall be carried out after the cutting of an additional longitudinal section of sufficient length to remove the coil end effect with a maximum of 2 0 m.
See Option 10, Clause 13 special type of marking. NOTE 1 Where the option for hot dip galvanizing is chosen see Clause 1 3 the marking methods and materials used can be agreed upon in order to avoid interference with preparation for hot dip galvanizing see EN ISO 1 3 In addition if specified at the time of the order there shall be either no die stamping or only die stamping in positions indicated by the purchaser.
See Option 31 , Clause 13 Die stamping not allowed or at special position. The following options see 5. L 0,2 0 0,80 1 ,70 0,02 0 0,01 0 0,01 5 0, 0 1 ,5 0 0,5 0 0,70 0,06 4,0 0,05 0,1 2 0,1 5.
L 0,2 2 0,86 1 ,80 0,02 5 0,01 2 0,01 6 0, 0 1 ,60 0,5 5 0,74 0,07 4,1 0 0,07 0,1 4 0,1 7. Annex A normative. Dimensions in millimetres. Annex B informative. Table B. S5 5 0QL 1. SQL1 1. Annex C informative. Table C. S-content - x x - -. BSI is incorporated by Royal Charter.
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BS EN 10025-6:2019
EN - European standard for hot-rolled structural steel. Part 6 - Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition. European steel grades designation systems. New standard EN : are similar but not identical to EN , Standard EN published in six parts, here you can find steel grades and numbers for EN - Part 6 standard:. Symbols used in EN - 6 :
S890QL steel – quick summary
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