Steel Tube Handbook - 2018

102 Selection of tests shall be govern by relevant standards that apply to individual products. The values apply for dimension and material condition specified in the standards. Unless otherwise specified, tests relate to samples taken longitudinally Mechanical testing Tensile test at room temperature(Zugversuch bei Raumtemperatur) Determined values: The upper yield strength R eH or the 0,2% proof strength R p0,2 (MPa) The tensile strength R m (MPa) Elongation A min. (%) EN 10002/1 - replaced by EN ISO 6892-1, DIN 50 145,ČSN 42 0310,ASTM A370 (ASME SA 370) Tensile test at elevated temperature(Zugversuch bei erhohter Temperatur) Determined values: The proof strength at the agreed temperature Rp 0,2 (MPa) EN 10002-5, DIN 50 145,ČSN 42 0312 Hardness test (Härteprufung) (according to agreement and possibilities) Detected values: Brinell: EN 10003, EN ISO 6506,DIN 50 351,ČSN 42 0371,ASTM E 10 Rockwell: EN 10004,EN ISO 6508, DIN 50 103, ASTM E 18 Vickers: EN ISO 6507,DIN 50 133,ASTM E 92, ASTM E 384 Conversion table hardness to R : DIN 50 150 Impact test at 20°C (Kerbschlagbiegeversuch bei 20°C) Impact test at low temperatures (Kerb. bei niedrigen Temperaturen) The possibility of execution of examination is depended on dimensions of tubes Determined values: Minimum average absorbed energy KV (impact energy) (J) EN ISO 148-1, DIN 50 115, ČSN 42 0381, ASTM A370 (ASME SA 370) Creep testing (Langzeitwarmfestigkeit) The creep rupture properties shall not be subject to verification, the steels are tested at verification of products technology Determined values: The creep proof strength (Zeitdehngrenze) R T (t/A/T) is the tension, which in time t at temperature T bring about A % of middle durable relative elongation of length of test specimen. E.g. A =1%, t = 10 000 hours, T = 500°C - R T 10 000/1/500 = 70 MPa The creep rupture strength (Zeitstandfestigkeit) - R mT (t/T) is the tension, at which durable activity at temperature T is middle time t until fracture of specimen. E.g. tension 100 MPa results in the time t = 10 000 hours and at temperature T = 600°C the fracture of component - R mT 10 000/600 = 100 MPa Data are presented in annexes of standards and can be used for calculations. At the present time is used second value and for stability calculations is compared in under creep area with proof strength at elevated temperature. For calculations is used always lower value. EN ISO 204 EN 10291 +Bbl 1, ČSN/STN 42 0351 (42 0302), ASTM E139 Fatigue testing – test is not included in standards for tubes and pipes Tests for mechanical and technological properties of tubes