BS ISO 630‑4:2021 pdf download.Structural steels Part 4: Technical delivery conditions for high yield strength quenched and tempered structural steel plates and wide flats.
2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 630‑1, Structural steels — Part 1: General technical delivery conditions for hot-rolled products
3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 630‑1 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/
6 Requirements 6.1 Steelmaking process See ISO 630‑1. If a special steelmaking process has been specified, this shall be reported in the inspection document. The steels shall contain sufficient amount of nitrogen‑binding elements and have a fine‑grain structure. The steels specified in this specification shall be fully killed.
6.2 Delivery condition The products covered by this document are delivered in the quenched and tempered condition. The delivery condition is indicated in the inspection document. 6.3 Chemical composition 6.3.1 Heat analysis The chemical composition determined by heat analysis shall conform with the values specified in Table A.1 or Table B.1. 6.3.2 Product analysis The product analysis of grades S460Q, S500Q, S550Q, S620Q, S690Q, S890Q and S960Q shall comply with the values given in Table A.2. The permitted deviations on analysis of grades SG460Q, SG500Q, and SG700Q, relative to the values for heat analysis, are given in Table B.2. 6.3.3 Carbon equivalent value The maximum carbon equivalent value (CEV) requirements for Annex A grades are given in Table A.3 and for Annex B grades in Table B.3.
6.4 Mechanical properties 6.4.1 Tensile properties The tensile properties at room temperature shall comply with the values specified in Table A.4 or Table B.4.BS ISO 630‑4 pdf download.