Steel Tube Handbook - 16. edition january 2021

65 TDC Steel grade Testing and certificates Other TDC standards Name Condition Surface Testing Certificate Marking Surfaceprotection Packing Bundle with section: • round • hexagonal Max weight 2000 kg 42 0260 11 353 11 453 11 503 11 523 11 550 11 650 12 040 12 050 12 060 Cold finished Symbol for steel condition: .0 No heat treatment .1 Normalized Other conditions upon agreement .0+ - scaled .1+ - pickled .2+ - free of scale .3+ - bright .4+ - metallic clean .9+ - special agreement (first number behind DS) • dimensions • tensile test .1, .2, .4 • hardness .3 • flattening .4 • drift expanding .4 • leak tightness .2, .4 • NDT - upon agreement .1+ - certificate .2+ - inspection .9+ - agreement first digit after TDC Label with data on bundle Data: • manufacturer •order • dimension • steel • condition • quantity • colour strap on tube Termporary upon agreement 8733 21729 1050: 10 20 35 45 4543: 10G2 15ChM 19281: 09G2S Cold finished Symbol for steel condition: No heat treatment Normalized Other conditions upon agreement • product analysis • dimensions • visual • hardness • leak tightness GOST 10692 74240 (74220) 84018: 18G2A 18G2 84019: 10 20 35 45 55 84023/7: R35 R45 R55 Cold finished Symbol for steel condition: BK BKW GBK NBK A519 See page 19 G3445 See page 19 Definition of status and nomenclature of heat treatment Delivery conditions and heat treatment according to DIN and EN Precision tubes are delivered in following conditions (first symbol lists previous designation, the new one according to EN is in brackets): +C (BK) Cold finished/hard (cold finished as drawn). No heat treatment after last cold forming process. +LC (BKW) Cold finished/soft (lightly cold worked). After last heat treatment there is a light finishing pass (cold drawing). +SR (BKS) Cold finished/stress relieve annealed. After the final cold forming process the tubes are stress relieve annealed. +A (GBK) Annealed. After the final cold forming process the tubes are annealed in a controlled atmosphere. +N (NBK) Normalized. After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere. Steel condition designation according to ASTM A519: CW – ColdWorked A – Annealed N – Normalized SR – Stress Relieved QT – Quenched and Tempered