HIGH STRENGTH FINE GRAINED STRUCTURAL STEEL
DILLIMAX 890 is a high strength quenched and tempered, fine grained structural steel with a minimum yield strength of 890 N/mm² in its delivered condition (referring to the lowest thickness range), whose mechanical properties are achieved by water quenching followed by tempering.
DILLIMAX 890 fulfils the requirements of EN 10 137. It is preferentially used for welded steel structures withinmechanical constructions, plant constructions and structural steel works, such as machines for structural engineering,conveying plants, hoists, cranes, penstocks, and frameworks. Product description Designation and range of application
The steel can be delivered in three grades:
- basic (B) with minimum impact values down to -20°C (-4°F): DILLIMAX 890 B
Steel number 1.8940 - S890Q according to EN 10 137
- high toughness (T) with minimum impact values down to -40°C (-40°F): DILLIMAX 890 T
Steel number 1.8983 - S890QL according to EN 10 137
- extra tough (E) with minimum impact values down to -60°C (-76°F): DILLIMAX 890 E
Steel number 1.8925 - S890QL1 according to EN 10 137
DILLIMAX 890 plates can be delivered in thicknesses from 6 to 100 mm (1/4 to 4 inches) according to thedimensional program. Dimensions, which deviate from the usual dimensional program for this type of steel, may bepossible on request. Chemical composition
For the ladle analysis the following limiting values (in %) are applicable:
* For greater plate thicknesses and high demands of toughness, the nickel content can be increased to max. 2%.
The steel is fine grained through sufficient aluminium content. Delivery condition
Water quenched and tempered according to EN 10 137. Mechanical and technological properties in the delivery condition Tensile test at ambient temperature - transverse test specimens -
1) If not apparent, the yield strength Rp0.2 is measured.
2) These values apply if tested according to ASTM A370. The values in brackets are only for information. Impact test on Charpy-V-specimens DILLIMAX 890
Impact energy Av in Joules (ft.-lb.) at test temperature
The specified values are minimum values; they are the average of 3 specimens, whereby the lowest individual value may not be less than 70% of thespecified minimum. The values in brackets are only for information. For plate thicknesses below 10 mm the test on Charpy-V-specimens will be performedwith reduced width. Therefore, the minimum value of the impact energy will be reduced in proportion to the reduction of the specimen´s cross section. Technological bend test
Formability of the transverse specimen subjected to the technological bend test:bending angle 180°; mandrel diameter ≥ 4x specimen thickness
Tensile and impact tests, and on request bend tests, will be performed according to EN 10 137. Tests on every heattreated plate may be possible on request.
The specimens for the tensile test are prepared according to EN 10 137. Testing is carried out on specimens of gaugelength l0 = 5.65√S0 or l0 = 5d0, in accordance with EN 10 002-1. Tensile tests according to ASTM A370 may beagreed.
The impact test will be carried out on Charpy-V-specimens in accordance with EN 10 045-1. Unless otherwise agreed,the test will be performed at the lowest temperature of the corresponding grade on transverse test specimens taken asfollows:•for plate thicknesses ≤ 40 mm: close to the surface
•for plate thicknesses > 40 mm: 1/4 of the plate thickness
Unless otherwise agreed, the test results are documented in a certificate 3.1 B in accordance with EN 10 204. Identification of plates
The plates are at least marked by stamp with the following information:•heat number
•steel designation (DILLIMAX 890 B, T or E)
In addition, the plates are stencilled with DILLIMAX 890 B, T or E. Fabricating properties
The entire fabrication and application techniques are of fundamental importance for the reliability of productsmanufactured with these steels. The fabricator should ensure that his calculation, design and manufacturing methodsare suitable for the intended application, are state of the art and, that they correspond with the properties of thematerial. The customer is responsible for the selection of the material. The recommendations of the Stahl-Eisen-Werkstoffblatt 088 or ECSC Information Circular No. 2 should be observed. Cold forming
Cold forming means forming below the maximum allowable stress relief temperature (560°C / 1040°F). DILLIMAX890 can be cold formed with regard to its high yield strength. Flame cut or sheared edges in the bending area shouldbe grinded before cold forming. Cold forming is always related to a hardening of the steel and to a decrease intoughness. This change in the mechanical properties can, as a rule, be partially recovered through a subsequent stressrelief heat treatment.
For larger cold forming amounts or if prescribed by regulations, a new quenching and tempering treatment may benecessary to restore the original mechanical properties. In this case we recommend you to consult us prior to ordering. Hot forming
Hot forming means forming at temperatures above the maximum allowable stress relief temperature (560°C /1040°F). The original quenched and tempered condition will thereby be altered. As a result, a new quenching andtempering treatment is always necessary after hot forming. It should be noted that when applying a new quenchingand tempering treatment, it is not always possible to obtain the same properties as with the original hot forming at themill, because of different hot forming equipment, for example. In this respect we recommend you to contact us prior toordering, in all cases where hot forming is required. However, it is the fabricator's responsibility to obtain the requiredvalues of the steel through an appropriate heat treatment. Welding and flame cutting
Due to its high yield strength, the fabrication of DILLIMAX 890 requires special care. For general weldinginstructions, please consult the SEW 088. In order to ensure that the tensile strength of the weld metal fulfils therequirements of the base material, the heat input and interpass temperature must be limited during welding. Experience has shown that the welding conditions should be chosen so that the cooling time t
seconds. This is applicable when using suitable filler materials of a corresponding yield strength class.
The raised yield strength of the base material must be taken into account when the filler materials are chosen. Itshould be considered that increased heat input leads to lower tensile properties in the weld metal. If either during orafter the manufacturing a stress relief heat treatment is planned, this must already be considered when selecting thefiller materials. To avoid hydrogen-induced cold cracking, only filler materials which add very little hydrogen to thebase metal, may be used. Therefore, shielded arc welding should be prefered. For manual arc welding, electrodes withbasic coating (type HD < 5 in accordance with DIN 8572), which are dried according to the manufacturer´sinstructions, should be used. With increasing plate thicknesses and a high residual stress condition of the weld, lowhydrogen annealing directly out of the weld heat is recommended.
For flame cutting, the following minimum preheating temperatures are recommended: 50°C (120°F) for platethicknesses up to 25 mm, 100°C (212°F) for plate thicknesses up to 50 mm and, 150°C (300°F) for thicker plates. Heat treatment
If a stress relieving has to be considered because of constructional regulations, constructive reasons or because it isnecessary for the fabrication, please consult us. The properties of structural components can be altered by a stressrelief heat treatment. Tolerances
Unless otherwise agreed, the tolerances will be in accordance with EN 10 029, with class A for thickness and, table 4,steel group H, for the maximum flatness deviation. Smaller flatness deviations may be possible on request. Surface quality
Unless otherwise agreed, the specifications will be in accordance with EN 10 163, class A2. General Note
If particular requirements are demanded and not covered in this data sheet, please contact us with the specificationsfor our review and agreement prior to ordering.
Detailed instructions for flame cutting, welding, machining and, about the structural properties of the DILLIMAX areprovided in the brochure ”DILLIMAX - HIGH STRENGTH STEEL”.
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