Transcription of ThyssenKrupp Materials International
1 ThyssenKrupp Materials International Page 1 material data sheet 11/2011 Austenitic-Ferritic Corrosion Resistant Steel material Data Sheet Steel Designation: Name material No. X2 CrNiMoN22-5-3 Scope This data sheet applies to hot and cold rolled sheet and strip, semi-finished products, rods, rolled wire and profiles as well as for seamless and welded tubes for pressure purposes. Application has an austenitic-ferritic microstructure in which both microstructure components are existent in equal shares. He combines the higher strength of ferritic chrome steels with the corrosion resistance of austenitic CrNi-steels. Due to the favorable mechanical properties, connected with the high resistance against corrosion, there are varied ap-plications in the chemical and petrochemical industry, as for example with the desalination of seawater and in the off-shore technology.
2 Due to the low C-content the resistance to intergranular corrosion is also guaranteed in the welded condition. Chemical composition (Heat analysis in %) Product form C Si Mn P S N Cr Mo Ni C, H, P, L, TW/S - - - - C = cold rolled strip; H = hot rolled strip; P = hot rolled sheet; L = semi-finished products, rods, rolled wire and profiles; TW = welded tubes; TS = seamless tubes Mechanical properties at room temperature i n solution annealed condition Product form Thick-ness 0,2 % Tensile strength Elongation Impact energy (ISO-V) Yield strength A1) A1) KV room temperature Rp0,2 Rm %min %min 10 mm thick mmmax N/mm min N/mm (longitudinal (longitudinal Jmin Jmin + transverse) + transverse) (longitudinal) (transverse) C 8 5002) 700 - 9502) 20 20 - - H 13,5 4602) 7000 - 9502) 25 25 100 60 P 75 4602) 640 - 8402) 25 25 100 60 L 160 4503) 650 - 8803) 253) 100 - TW 30 4503) 700 - 8803) 253) 202) 120 904) TS 30 4503) 640 - 8803) 223) 222) 120 904) 1) Gauge length and thickness according to DIN EN 2)
3 Transverse test piece, with products widths < 300 mm longitudinal test piece 3) Longitudinal test piece, external diameter > 508 mm transverse test piece 4) min. 40 J at -40 C ThyssenKrupp Materials International Page 2 material data sheet 11/2011 Reference data on some physical properties (for guidance only) Density at 20 C Modulus of elasticity kN/mm at Thermal conductivity at 20 C Specific thermal capacity at 20 C Specific electrical resistivity at 20 C kg/dm 20 C 100 C 200 C 300 C W/m K J/kg K mm /m 7,8 200 194 186 180 15 500 0,8 Mean coefficient of thermal expansion 10-6 K-1 between 20 C and 100 C 200 C 300 C 13,0 13,5 14,0 Guidelines for temperatures for hot forming and heat treatment1) Hot forming Heat treatment AT (solution annealed), Microstructure Temperature C Type of cooling Temperature C2)
4 Type of cooling Microstructure 1150 to 850 Air 1020 to1100 Water, air Ferrite-Austenite 1) For simulative heat treated test pieces the temperatures for solution annealing have to be agreed. 2) If heat treatment is carried out in a continuous annealing furnace, usually the upper area of the mentioned temperature range is preferred or even exceeded. Processing / Welding Standard welding processes for these steel grades are: TIG-welding Arc welding (E) MAG-welding solid wire Submerged arc welding (SAW) MAG-welding cored wire Process Filler metal similar TIG Thermanit 22/09 MAG solid wire Thermanit 22/09 MAG cored wire Thermanit 22/09-PW Thermanit TG 22/09 Arc welding (E) Thermanit 22/09 Thermanit 22/09 W SAW Thermanit 22/09 Marathon 431 Starting with wall thickness of about > 10 mm a preheating up to a minimum of 100 C recommended; with bend-proof components the temperature should be increased when applicable.
5 It is not permitted to exceed the preheating respec-tively the inter pass temperature (working temperature) of 200 C. can be weld with higher heat input than austenitic steels. 8 - 25 KJ/cm are recommended, the tendency should go to the higher values. An accelerated cooling by compressed air or water is not permitted, because with this a ferrite share of up to 90 % has to be expected. The welding of the root pass and of the first filler pass with double-V butt weld at this sheets or K-butt welds at stiff com-ponents should be performed with higher alloyed austenitic electrode. When welding all procedures, which work against this distortion (e. g. back-step sequence welding, welding alter-nately on opposite sides with double-V butt weld, assignment of two welders when the components are accordingly large) have to be respected notably.
6 For product thicknesses over 12 mm the double-V butt weld has to be preferred instead of a single-V butt weld. The included angle should be 60 - 70 , when using MIG-welding about 50 are enough. An accumula-tion of weld seams should be avoided. ThyssenKrupp Materials International Page 3 material data sheet 11/2011 Tack welds have to be affixed with relatively shorter distances from each other (significantly shorter than these of non-alloyed steels), in order to prevent strong deformation, shrinking or flaking tack welds. The tacks should be subsequently grinded or at least be free from crater cracks. A heat treatment after welding is not necessary. Processes without filler metals are not allowed, due to associated preferred ferritic solidification.
7 The most successful way to a balanced ferrite-austenite ratio is a subsequent heat treatment. Here a short hold time of about 5 min. up to temperatures around 1040 C will do. Afterward a not to fast cooling is recommended, because with a to fast cooling a to high ferrite share is connected (see also paragraph 2). While processing only stainless tools like steel brushes, pneumatic picks and so on are allowed, in order to not endanger the passivation. It should be neglected to mark within the welding seam zone with oleigerous bolts or temperature indicating crayons. The high corrosions resistance of this stainless steel is based on the formation of a homogeneous, compact passive layer on the surface.
8 Annealing colors, scales, slag residues, tramp iron, spatters and such like have to be removed, in order to not destroy the passive layer. The two-phase microstructure increases the resistance against stress corrosion cracking in comparison with the austenitic Cr-Ni-steels. For cleaning the surface the processes brushing, grinding, pickling or blasting (iron-free silica sand or glass spheres) can be applied. For brushing only stainless steel brushes can be used. Pickling of the previously brushed seam area is carried out by dipping and spraying, however, often pickling pastes or solutions are used. After pickling a carefully flushing with water has to be done. is also suitable for laser beam fusion cutting with nitrogen.
9 The cut edges only have small heat affected zones and are generally free of micro cracks and thus are well formable. While choosing an applicable process the fusion cut edges can be converted directly. Especially, they can be welded without any further preparation. Remark The material is magnetizable. Editor ThyssenKrupp Materials International GMBH Technical Sales / Quality Management Am Thyssenhaus 1 45128 Essen References DIN EN 10088-2:2005-09 Beuth Verlag GmbH, Postfach, D10772 Berlin DIN EN 10088-3:2005-09 DIN EN 10216-5:2004-11 DIN EN 10217-7:2005-05 VdT V- material data sheet 418 Verband der T V , T V Media GmbH, Am Grauen Stein, D-51105 K ln MB 821 "Properties" Informationsstelle Edelstahl Rostfrei, Postfach 10 22 05, MB 822 "The converting of stainless steel" D-4013 D sseldorf DVS bulletin 3203, part 3 Verlag f r Schwei en und Verwandte Verfahren DVS Verlag GmbH, Postfach 10 19 65, D-4010 D sseldorf Laser beam electric arc cutting of stainless steels Thyssen Lasertechnik GmbH, Aachen Laser beam longitudinal welding of profiles of stainless steel B hler Schweisstechnik Deutschland GmbH.
10 Hamm Important note Information given in this data sheet about the condition or usability of Materials respectively products are no warranty for their properties, but act as a description. The information, we give on for advice, comply to the experiences of the manufacturer as well as our own. We cannot give warranty for the results of processing and application of the products.
