Steel Tube Handbook - 2018

34 Seamless steel tubes for pressure equipment of fine-grained steels DIN 2391-1 Seamless precision steel tubes. Part 1: Dimensions. DIN 2448 Plain end seamless steel tubes. Dimensions. DIN 17179 Seamless circular tubes of fine grain steel for special requirements. TDC. EN 10 216-3 Seamless steel tubes for pressure purposes. TDC. Part 3: Non-alloy and alloy fine grain steel tubes. DIN 2448 Seamless tubes, dimensions. List of dimensional standards and technical delivery conditions standards Designation of steel according to EN: P – steel for pressure equipments 355 – minimum yield strength in N/mm2 N – normalized or normalising formed NH – high temperature steel NL1 – low temperature steel NL2 – special low temperature steel Note: Fine grain steel – ferritic grain size 6 or finer according to ASTM E112. Stan- dards Dimensions Dimen- sional standards Dimensional range Tolerance D Tolerance T Lengths Straightness Tube ends EN 10216-3 Table 5/Page 40 Hot finished: D ≤ 219,1 mm ±1 % min ±0,5 mm Cold finished: ±0,5 % min ±0,3 mm D ≤ 219,1 mm ±12,5% min ±0,4 mm ±10% min ±0,2 mm Kinds: • random • exact Indicative values: • D < 60,3 mm 5–6 m • D ≥ 60,3 mm / T < 7,1 mm 5–6 m or 10–14 m • D ≥ 60,3 mm / T ≥ 7,1 mm 5–6 m • longer upon agreement Exact length tolerances:  • L < 6 m 0 +10 mm • L = 6–12 m 0 +15 mm • L > 12 m + upon agreement – 0 Permissible 0,0015.L for tube conversion to 1 m max. 3 mm • square cut ends • free from excessive burrs • option: with beveled ends Delivery by d min a T min upon agreement (Page 26) 10305-1 (upon agre- ement) Table 25/Page 69 Cold finished - precision See page 62 - 65 DIN 2448 Table 5/Page 40 D ≤ 100 mm ±1% min ±0,5 mm D = 100–200 mm ±1% D < 130 mm • T ≤ 2Tn –10 % +15 % • 2Tn< T <4Tn –10% +12,5% • T > 4Tn ±9% D > 130 mm See page 22 Tn – basic wall thickness according to DIN 2448 Kinds: • random • fixed ±500 mm • exact Indicative values: • D < 60,3 mm 5–6 m • D ≥ 60,3 mm / T < 7,1 mm 5–6 m or 10–14 m • D ≥ 60,3 mm / T ≥ 7,1 mm 5–6 m • longer upon agreement Exact length tolerances:  • L ≤ 6 m 0 +10 mm • L ≥ 3 m +1,5 mm/m max 15 mm • visually straight • upon agreement • square cut ends • free from excessive burrs • option: with beveled ends T ≥ 3,2 mm 2391-1 (upon agre- ement) Table 25/Page 69 Cold finished - precision see pages 62 - 65  HF production facilities to 12,7 m + 50 mm (30 mm), over 12,7 m + 100 mm