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          BS EN 10253-4 Butt-welding pipe fittings Part 4:Wrought austenitic and austenitic-ferritic (duplex)stainless steels with specific inspection requirements

          1 Scope

          1.1 This European Standard specifies the technical delivery requirements for seamless and welded butt-welding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of austenitic and austenitic-ferritic (duplex) stainless steel which are intended for pressure and corrosion resisting purposes at room temperature, at low temperature or at elevated temperatures.

          It specifies:

          ? the type of fittings;

          ? type A (see 7.2)

          ? type B (see 7.3)

          ? the steel grades;

          ? the mechanical properties;

          ? the dimensions and tolerances;

          ? the requirements for inspection and testing;

          ? the inspection documents;

          ? the marking;

          ? the handling and packaging.

          NOTE In the case of a harmonised supporting standard for materials, presumption of conformity to the Essential Requirement(s) (ESRs) is limited to technical data of materials in the standard and does not presume adequacy of the material to a specific item of equipment. Consequently the technical data stated in the material standard should be assessed against the design requirements of this specific item of equipment to verify that the ESRs of the Pressure Equipment Directive (PED) are satisfied.

          1.2 Unless otherwise specified in this European Standard the general technical delivery requirements in EN 10021 apply.

          2 Normative references

          The following referenced documents are indispensable for the application 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.

          EN 287-1, Qualification test of welders – Fusion welding – Part 1: Steels

          EN 473, Non destructive testing – Qualification and certification of NDT personnel – General principles

          EN 910, Destructive tests on welds in metallic materials – Bend test

          EN 1418, Welding personnel – Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanized and automatic welding of metallic materials

          EN 10002-1, Metallic materials – Tensile testing – Part 1: Method of test at ambient temperature

          EN 10002-5, Metallic materials – Tensile testing – Part 5: Method of testing at elevated temperature

          EN 10021:2006, General technical delivery conditions for steel products

          EN 10027-1, Designation systems for steels – Part 1: Steel names

          EN 10027-2, Designation systems for steels – Part 2: Numerical system

          EN 10028-7, Flat products made of steels for pressure purposes – Part 7: Stainless steels

          EN 10045-1, Metallic materials – Charpy impact test – Part 1: Test method

          EN 10088-2, Stainless steels – Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes

          EN 10168, Steel products – Inspection documents – List of information and description

          EN 10204, Metallic products – Types of inspection documents

          EN 10216-5, Seamless steel tubes for pressure purposes – Technical delivery conditions – Part 5 : Stainless steel tubes

          EN 10217-7, Welded steel tubes for pressure purposes – Technical delivery conditions – Part 7: Stainless steel tubes

          EN 10266:2003,Steel tubes, fittings and structural hollow sections – Symbols and definitions of terms for use in product standards

          EN 10272, Stainless steel bars for pressure purposes

          EN 13445-3, Unfired pressure vessels – Part 3: Design

          EN 13480-3:2002, Metallic industrial piping – Part 3: Design and calculation

          EN ISO 377:1997, Steel and steel products – Location and preparation of samples and test pieces for mechanical testing (ISO 377:1997)

          EN ISO 1127, Stainless steel tubes – Dimensions, tolerances and conventional masses per unit length (ISO 1127:1992)

          EN ISO 3166-1, Codes for the representation of names of countries and their subdivisions – Part 1: Country codes (ISO 3166-1:2006)

          EN ISO 3651-2, Determination of resistance to intergranular corrosion of stainless steels – Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels – Corrosion test in media containing sulfuric acid (ISO 3651-2:1998)

          EN ISO 6708, Pipework components – Definition and selection of DN (nominal size) (ISO 6708:1995)

          EN ISO 14284, Steel and iron – Sampling and preparation of samples for the determination of chemical composition (ISO 14284:1996)

          EN ISO 15614-1, Specification and qualification of welding procedures for metallic materials – Welding procedure test – Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys (ISO 15614-1:2004).

          Research use only,Commercial use is prohibited.

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