Hot-rolled MSH sections for mechanical engineering. We ll be sending you copies from existing stocks until the revised version is available.

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1 Hot-rolled MSH sections for mechanical engineering GRADE SERIES: FORTERIOR, FINEXCELL Hot-rolled MSH sections for mechanical engineering Grade series: FineXcell We ll be sending you copies from existing stocks until the revised version is available.

2 High-strength MSH sections Square and rectangular MSH sections from VALLOUREC & MANNESMANN TUBES have been widely used for decades as structural elements in many areas of mechanical engineering. But the demands on the material have been constantly rising. Our response is innovative product improvement. 60 [ C] Impact toughness S355NLH S355NH S355J2H 370 Standard S420NLH S420NH 430 S460NLH S460NH 470 FineXcell 550 Quenched & Tempered FineXcell 690 FineXcell 770 FineXcell 890 The distinguishing feature of our hot-rolled hollow sections has always been the outstanding quality of the material used in their manufacture. This is attributable not least to V & M TUBES' expertise in seamless tube production V&M Special 500 Yield Strength 650* *The yield strength comes up to approximately 400 MPa in V&M TUBES delivered condition. After a heat treatment (quenching and tempering) appropriate to the application, a yield strength of approximately 650 MPa will be reached. 900 [MPa] In order to expand the current range of hot-rolled hollow sections in standardized steels, VALLOUREC & MANNESMANN TUBES has launched two technologically sophisticated branded grade series, which can achieve yield strength levels of up to 890 MPa: The series features increased yield strengths in the range of 370 MPa to 650 MPa coupled with outstanding weldability. Compared to standard grades, offers significant weight-saving potential without compromising on the component's load-bearing capacity. The FineXcell series comprises our fine-grain grades with specified minimum yield strengths of over 500 MPa up to a groundbreaking 890 MPa. Outstandingly high yield strength, impact toughness at extremely low temperatures and excellent weldability make this branded grade series a unique, cost-effective solution in the design of challenging mechanical engineering applications, such as cranes and other highly stressed structures. 2

3 Know-how as a basis As rolled Normalized Quenched & tempered 1 µm 20 µm 20 µm Magnification :1 (electron microscope) Five decades of experience in the manufacture of hot-rolled hollow sections and continuous improvement of our production processes: FineXcell steels owe their outstanding properties to the special know-how and experience of V & M TUBES: the material's microstructure and grain size are dictated by the meticulously controlled chemical compositions and advanced heat treatment methods. Optimally adjusted heating temperatures and cooling rates during heat treatment as well as defined sulfur, phosphorus and carbon contents are the prerequisites for achieving a homogeneous fine-grained microstructure. And this, in turn, makes it possible to unite three important, but previously difficult to reconcilable properties: high strength, good impact toughness, and excellent weldability (for detailed information see p. 9). The production of high-strength MSH sections comprises the following steps: First, as with conventional steels, a round tube is rolled. At the end of the rolling process, the round tube is hot-rolled into a square or rectangular hollow section which is then quenched and tempered to give it the required properties. Alternatively, the round tubes can first be hardened and then shaped into a square or rectangular hollow section while still at tempering temperature. Either way it is ensured that the final forming step takes place above recrystallizing temperature. The specified mechanical and technological properties are achieved by precise control of the heat treatment parameters, and especially the tempering temperature. The finished MSH section exhibits a fine-grained microstructure with uniform properties through the entire cross section. Austenitizing Quenching Tempering Straightening Visual inspecting Transport 3

4 Advantages at a glance S235JR S355J2H S460NH FineXcell 690 ImpactFit 50 FineXcell 890 ImpactFit 50 Higher tensile strength permits an increase in load-bearing capacity without having to increase the cross section or wall thickness. At the same time, substantial weight savings can thus be achieved. With the same outside diameter and wall thickness (here: 220 mm edge length, 16 mm wall thickness), load-bearing capacity can be increased by 333 %. 100 % 151 % 197 % 295 % 333 % With the same load-bearing capacity, the wall thickness can be reduced to a quarter of the original dimension, resulting in more slender and substantially lighter structures. t = 20.0 mm t = 12.5 mm t = 8.8 mm t = 6.3 mm t = 5.0 mm 140 mm With the same load-bearing capacity, the cross section of the hollow section and thus the weight of the entire structure can be reduced by up to 75 %. 100 % 65 % 50 % 30 % 25 % 4

5 Economic aspects The use of high-strength FineXcell grades enables you to achieve significant reductions in the overall cost of materials for a variety of reasons. Higher yield strengths allow you to use thinner walls. So, if you order FineXcell 690 ImpactFit 50 instead of S355 steel, you cut the amount of steel you require by half. What's more, savings in weight also means less handling and transportation costs in your overall production process. Ideal for use in permafrost regions Their outstanding impact toughness makes FineXcell grades top performers in the lowtemperature range down to 50 C. Outstanding resistance to brittle fracture This outstanding low-temperature impact toughness also makes for exceptional resistance to brittle fracture. Substantial cost savings during welding work But your savings potential is not limited to the base material alone: the butt-welding of such hollow sections reduces the weld volume to less than a third (Fig. 1). In the case of butt welding especially, a base material with higher yield strength and reduced joint cross sections offers high potential for cutting production costs. Besides factors such as welding time, personnel expenses and welding supplies (filler metals, gas, etc.), this also includes the scope for optimizing weld design and welding preparations. The weld volume V corresponds to the weight of the weld: d 355 = 1.9 x d 690 d 690 = 1 V 355 = 3.7 x V 690 Fig. 1: Optimisation potential of a welded joint: comparison of weld volumes for S355J2H and FineXcell 690 Further unparalleled advantages at a glance Hot-rolled hollow sections from V & M TUBES feature extremely tight tolerances and special dimensions that are only available from V & M TUBES. Given their large flat connecting surfaces resulting from the tight corner radii of less than Ra 1,5 T or even less than Ra 1 T in the case of extra-tight corner radii MSH sections are particularly well suited for compact and highly stressed structures. By contrast with coldformed hollow sections, our hot-rolled MSH sections also offer unlimited weldability right to the corner radii. EN , Table 8.1, assigns seamless circular, square and rectangular MSH sections to the highest fatigue class (160), while welded hollow sections are assigned to fatigue class 140 or 125. EN states that there is no higher fatigue class than 160, and no other notch case can achieve a higher fatigue resistance with any number of fatigue cycles. 5

6 Ecological aspects Besides the purely technical values, the ecological rating of a structure also has a high priority nowadays. This rating is based not only on engineering aspects but on factors such as minimal consumption of non-renewable resources and sources of energy. The ecological quality of a product is used as a definitive parameter of ecological sustainability. A life cycle assessment of the MSH sections yielded values for global warming potential (GWP), which relates to carbon dioxide emissions, ozone depletion potential (ODP), which relates to the ozone hole, photochemical ozone creation potential (POCP), which relates to hydrocarbons and summer smog, acidification potential (AP), which relates to acid rain, eutrophication potential (EP), which relates to nitrogen oxides, and demand for primary energy from renewable and non-renewable resources. These data are checked by an independent auditor and then incorporated in a product declaration, which is published by the Institut Bauen und Umwelt e.v. Product specification The technical delivery conditions comply with EN (Testing) and EN (Tolerances). Chemical composition (Heat analysis 1) ) FineXcell 690 C % Si % Mn % P % S % Cr % Mo % Ni % N % V % Al % Cu % 2) Nb % Ti % CEV % 1) Depending on wall thickness and production conditions, the elements B %, W 1.50%, Zr 0.15% can be added in amounts up to these maximum values in order to achieve the specified properties. 16 > ) When Cu > 0.30%, Ni must be present in an amount equal to at least half of the amount of Cu FineXcell 890 C % Si % Mn % P % S % Cr % Mo % Ni % N % V % Al % Cu % 2) Nb % Ti % CEV % 1) Depending on wall thickness and production conditions, the elements B %, W 1.50%, Zr 0.15% can be added in amounts up to these maximum values in order to achieve the specified properties. 20 2) When Cu > 0.30%, Ni must be present in an amount equal to at least half of the amount of Cu V & M TUBES grade brands meet and in even surpass the requirements of the relevant standard grades. The respective compliance with the standard is clearly indicated in the material data sheets, orders and certificates. For the detailed mechanical properties and chemical composition of the and FineXcell grades we refer to our respective latest issued material data sheets. 6

7 Mechanical properties (at room temperature) FineXcell 690 Yield strength R eh min 3) [MPa] Tensile strength R M [MPa] Elongation A min [%] > longitudinal transverse to FineXcell 890 Yield strength R eh min 3) [MPa] Tensile strength R M [MPa] Elongation A min [%] 16 > > longitudinal transverse to to ) Where the upper yield strength is not defined, the 0.2% proof stress Rp 0.2 shall be determined. Impact energy FineXcell 690 wall thicknesses [mm] 4) Minimum average values; only one individual value may be up to 30% below the average value. 5) The test is conducted on longitudinal specimens at a lowest temperature for which the values are specified. Testing on transverse specimens or at a higher temperature may be agreed upon. Impact energy [J] on 3 Charpy-V specimen 4) at stated test temperature (average of three specimens) 5) longitudinal transverse longitudinal transverse longitudinal transverse longitudinal transverse FineXcell 890 wall thicknesses [mm] Impact energy [J] on 3 Charpy-V specimen 4) at stated test temperature (average of three specimens) 5) longitudinal transverse longitudinal transverse longitudinal transverse longitudinal transverse

8 Test certificates Like all our MSH sections, high-strength MSH sections are supplied with a mill certificate that confirms the material s conformity with the customer's order specifications. As a rule, this is a mill certificate as per EN Alternatively, an inspection certificate as per EN can be issued by an acceptance society for the customer s choice. In either case, the certificate shows the results of tests conducted on the delivered material. If required by the customer, further tests can be agreed upon in addition to the standard scope of testing: Pcm (composition parameter) Tensile test at elevated temperatures Transverse tensile test Transverse Charpy impact test* Maximum hardness values* * Values to be agreed at the time of ordering 8

9 Welding In line with the state of technology for processing high-strength fine-grain structural steels, hotrolled MSH sections in steel grades FineXcell 690 and FineXcell 890 are weldable by all current techniques. The excellent weldability of V & M TUBES grades is attributable to their low carbon equivalent, fine-grained microstructure and a minimum amount of contaminants or accompanying elements. These properties support the manufacture of welded joints with good mechanical properties even in the event of high heat input. In other words, crack-free welds with high toughness can be executed even when highoutput and economic welding processes are used. Welding and thermal cutting processes must be performed on the basis of the the applicable standards and specifications, depending on the intended application. Compared to lower-strength or thermomechanically treated steels, materials FineXcell 690 and FineXcell 890 usually have a higher alloying content and a higher carbon equivalent. This must be taken into account with appropriate preheating to the interpass temperature and/or 8/5 times matching the material. For example, in order to avoid impermissible hardness peaks, preheating to approximately 150 C may be necessary depending on the design when MIG welding FineXcell 690 base material with a wall thickness of 10 mm. Since the sections are hot-rolled, there are no restrictions regarding welding in the edge area. Figure 2 shows an example of a welded joint between two sections. It should be pointed out that increased hardness levels must be expected in the root base of welds of this type. Special attention must be devoted to weld preparation in the area of the corner radius. Unless machining (e.g. milling) to close tolerances is carried out in this Fig. 2: Microsection of two MSH sections welded together area and the section's geometry as delivered is used as welding preparation, the welds must be checked and tested with particular care. In all cases, the sections should be cleaned and adhering rolling skin should be removed, e.g. by grinding or a suitable shot blasting process. Further information is contained in our information leaflet on the weldability of MSH FineXcell grades. 9

10 MSH sections Application storys In certain load-critical areas of the container vessels, HDW-Gaarden relies on the special properties of MSH sections from V & M TUBES. These seamless hollow sections are employed wherever weight-optimized components with the excellent buckling strength of closed hollow sections are required, and especially in the ship s side supports for the containers stacked above deck. To increase the vessel s loading capacity, containers are stacked up to seven deep above the cargo hold on deck, right to the very edge, giving modern freight carriers their characteristic appearance of floating mountains of containers. The demands made on these supports are huge, as they not only have to withstand the vertical load of the 20-tonne containers but also have to be able to absorb the tremendous transverse and lateral forces caused by the motion of the sea and the wind. HDW-Gaarden also relies on the excellent properties of MSH profiles for the supports between the individual decks of the machine room, where the relatively slim girders bear the massive load of the ship s auxiliary units on the various decks. ELME (world largest independent spreader manufacturer) has the fullest confidence in the hot-rolled structural hollow sections from V & M TUBES above all on account of their dimensional accuracy, their narrow tolerances and their corner radii, which are advantageous for weld and screw connections. Manufacturers of agricultural equipment rely on hot-rolled high-strength MSH sections. And for good reason: they are used wherever stresses are particularly high for years of heavy-duty agricultural service and where sections have to be bent or laser cuts have to be applied close to the edges. V & M TUBES offers a comprehensive portfolio of steel grades to all relevant international standards. This offering is complemented by six branded series of V & M TUBES grades. Based on V & M TUBES know-how, these series combine in-house material developments and far exceed the quality requirements of international standards. This has opened up a whole host of applications for them in mechanical engineering, in plant, vehicle and crane construction, agricultural equipment and mining, a wide range of offshore applications and for accessories for the oil and gas industry and in the building construction sector. The graph below is intended as an initial guide to our wide and varied product portfolio. Grade portfolio Industry division V & M TUBES for standard grades V & M TUBES specific branded grades Basic Mechanical Grades Multicert series EN 10297, EN E355, S355J2H, Grade B, C, Engineering Grades Spirafort series EN series EN 10297, EN Advanced Engineering Grades Avadur series ASTM A 519 Alloyed heat treatable steels 25CrMo4, 34CrMo4, 42CrMo4, Grade 4130, Grade 4140,... Unalloyed heat treatable steels C35E, C45E, C60E, Grade 1045,... Case hardening steels 16MnCr5, C10E, 20NiCrMo2-2, Offshore Grades Oceanfit series API 5L, EN X52, X65, X80,... Round tubes Hollow bar Fine-Grain High- Strength Grades FineXcell series Stahl-Eisen- Werkstoffblätter S460NLH, P690QL1,... Square and rectangular hollow sections V & M TUBES grade brands meet and in many cases surpass the requirements of the relevant standard grades. The respective compliance with the standard is clearly indicated in the material datasheets, orders and certificates. Increasing technical requirements 10

11

12 V & M DEUTSCHLAND GmbH Industry Theodorstraße Düsseldorf Germany telephone telefax info.service@vmtubes.de Technical Consulting telephone telefax info.service@vmtubes.de Vallourec Group V & M D01B0031B-12GB

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