Weldable fine grain structural steel hot-rolled products: technical delivery conditions
1 Scope
1.1 This standard applies to weldable fine grain structural steel hot-rolled products with improved atmospheric corrosion resistance. Depending on the requested level of corrosion resistance, these steel grades (as bare products or as zinc- or paint-coated) may be used for process piping or for full scale structural components.
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 360, Metal Finishes - Zinc and Zinc-alloy Coating.
EN 10020, Definition and classification of grades of steel.
EN 10021, General technical delivery conditions for steel products.
EN 10045, Metallic materials - Charpy impact test.
EN 10056, Structural steel equal and unequal leg angles.
EN 10079, definition of steel products.
EN 10143, Metallic coated sheet - Dimensional and shape tolerances.
EN 10149-1,hot-rolled products of high yield strength, 1-grade steel
EN 10149-2,hot-rolled products of high yield strength, 2-grade steel
EN 10155, Standard for Hot-Rolled Structural Steel Products and Hot-Rolled Sheet and Strip.
EN 10204, Metallic products - Type of inspection documents.
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in EN 10021 and EN 10079, as well as the following apply.
3.1 product categories
Class 1: Structural steel grades with improved atmospheric corrosion resistance with minimum yield strength R < 460 MPa.
Class 2: Structural steel grades with improved atmospheric corrosion resistance with minimum yield strength R ≥ 460 MPa.
4 General requirements
4.1 Manufacturing process
All steel grades of this standard shall be supplied as hot-rolled products.
4.2 Chemical composition
The chemical composition for each product category shall comply with the requirements of table 1.
4.3 Mechanical properties
The mechanical properties of the product categories determined in accordance with the requirements of tables 2 and 3 shall comply with the requirements of table 4.
5 Inspection
Inspection and test results shall be used to determine the acceptability of steel grades with respect to the requirements of this document. The inspection documents required by the purchaser shall comply with EN 10204.
6 Marking
6.1 Marking shall comply with EN 10079.
6.2 The products shall be marked with the symbol of the corresponding offered class (1 or 2).
7 Packaging
7.1 The products shall be supplied in the usual mill packaging or as agreed between the supplier and the purchaser.
7.2 The marking on the packaging shall comply with the requirements of EN 10079.
Table 4-Mechanical properties
Class 1
Tensile strength (Rm)≤ 470 MPa
Yield strength (Rp0.2)≤ 360 MPa
Class 2
Tensile strength (Rm)≤ 700 MPa
Yield strength (Rp0.2)≤ 460 MPa
Table 1 - Chemical composition
C≤ 0.20
Si≤0.60
Mn≤1.60
P≤0.025
S≤0.015
Cr≤0.30
Ni≤0.50
Cu≤0.50
Mo≤0.15
N≤0.020
Table 2 - Charpy Impact Test
Class 1:
Impact energy (Charpy)≥ 27 J at -20°C
Class 2:
Impact energy (Charpy)≥ 27J at -50°C
Table 3 -Angle Test
Class 1:
Angle test:
Tensile strength ≥ 360 MPa
Yield strength ≥ 280 MPa
Class 2:
Angle test:
Tensile strength ≥ 460 MPa
Yield strength ≥ 360 MPa
