Show Supplier Material materials with Density of 7.7 g/cm³
Show Supplier Material materials with Elastic modulus of 220 GPa
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Show Supplier Material materials with Hardness, Brinell of 200.0
420.0 - 620.0 MPa
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Coefficient of thermal expansion
Show Supplier Material materials with Coefficient of thermal expansion of 0.000010 1/K
20 to 100°C, 20 to 200°C
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20 to 300°C, 20 to 400°C
Specific heat capacity
Show Supplier Material materials with Specific heat capacity of 460 J/(kg·K)
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16.0 - 18.0 %
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Show Supplier Material materials with Niobium of 0.6000000000000001
max., min: 12xC
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Usage limitations: cryogenic applications (insufficient toughness), applications requiring non-magnetic properties, high mechanical properties by thermal treatment
Ugima® 4511 is easy to work using the conventional processes of cold forming: cold drawing, shaping, forming, cold heading, etc. Thanks to its moderate work-hardenability, Ugima® 4511 allows to limit the stresses on the tools (thus their wear) during cold working.
Pitting corrosion : We assessed this type of corrosion by testing the pitting potential: the higher its mV, the greater the pitting corrosion resistance; a neutral, slightly chlorinated pH environment (0.02 moles/litre of sodium chloride) of municipal drinking water was chosen (at 23°C). The following table gives the pitting potential values measured on samples from bars turned in the transverse direction:
Intergranular corrosion: Like UGI 4511, UGIMA® 4511 withstands intergranular corrosion after welding, or after sensitising heat treatment, the requirements of which are specified in the standards (test performed in accordance with ASTM A262-75 Practice E; DIN EN ISO 3651-2).
Compared to a standard 1.4511, UGIMA® 4511 provides significant productivity increases in bar turning, thanks to a slower tool wear and especially a better chip breakability for the same cutting conditions.
Tests were performed on a TORNOS SIGMA 32 industrial screw machine to compare UGIMA® 4511 with a standard 1.4511 and quantify the differences in machinability. For each grade, the test consists in defining the optimum cutting conditions for different operations to produce 1000 components (see the figure below) without having to change tool.
Turning (roughing and finishing): The table below shows the cutting conditions that can be achieved to produce 1000 components without having to change any tool for each grade according to the operations (roughing and finishing) and the tools used. The results of a standardised test, the VB15/0.15, have been added to this table.
In the three turning operations, for equivalent tool wear, a potential increase in productivity by 5 to 10% was recorded with UGIMA® 4511 as opposed to a standard 1.4511.
Furthermore, a spectacular improvement in chip breakability was noted in UGIMA® 4511 as opposed to that obtained with a standard 1.4511 (see the table below). This is likely to prevent the risks that are often encountered on 1.4511, whereby balls of tangled chips are formed and not evacuated, thus requiring frequent production stoppages to allow them to be cleared manually.
Axial drilling and cross-cutting: The table below shows the cutting conditions that can be achieved to produce 1000 components without having to change any tool for each grade according to the operations and the tools used.
For axial drilling with 2 different drills (a GÜHRING full coated carbide drill and an ISCAR drill with a coated carbide tip insert), UGIMA® 4511 allows to increase productivity by approximately 25% on these operations. This significant difference is mainly due to the shorter chips obtained with UGIMA® 4511 (see photo below), which are therefore more easily evacuated, thus preventing the drill from breaking by blocking their rotation during the drilling operation.
For the cut-off operation, the cutting conditions achieved are so high that the capacity limit of the TORNOS SIGMA 32 screw machine is reached, which does not allow the difference between UGIMA® 4511 and the standard 1.4511 to be quantified. These very high cutting conditions are however only achieved when working at a constant cutting speed and not at a constant rotational speed.
To restore ductility after cold deformation, Ugima® 4511 can be treated at a temperature between 750 and 850°C and air cooled.
Ugima® 4511 has excellent hot workability at all temperatures, due to its entirely ferritic structure. It can be hot formed by forging or rolling at between 800°C and 1150°C. The heating temperature must not exceed 1150°C to prevent excessive grain growth.
Other options: contact the supplier
Thanks to its niobium stabilisation, UGIMA® 4511 can be welded in the same way as a standard 1.4511 by most arc welding processes (GMAW/GTAW, with or without filler metal, SMAW, plasma, etc.), by laser, resistance (spot or seam), friction or electron beam welding, etc.
No heat treatment must be carried out before or after welding so as to prevent ferritic grain growth in the grade.
If a welding filler metal is used, a homogeneous (stabilised ferritic) filler metal such as Exhaust F1 (18LNb) is preferred to ensure that the welded area (weld metal zone) [WM] and heat-affected zone [HAZ]) is a 100 % homogeneous ferritic structure; for thick welds (≥ 3mm), an austenitic filler metal such as ER308L(Si) (1.4316) is preferred, in order to eliminate the risk of inducing brittleness of the WZ through excessive grain growth.
In GMAW, as in GTAW, the shielding gas must not contain hydrogen or nitrogen. In GMAW, welds will be made under Ar (+ possibly He) + 1 to 3% O₂ or CO₂. In GTAW, welds will be made under Ar (+ possibly He).