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WELD METAL DEPOSIT AND METAL POWDER CORED WELDING WIRE FOR PRODUCING A WELD METAL DEPOSIT

20210299798 · 2021-09-30

    Inventors

    Cpc classification

    International classification

    Abstract

    The invention relates to a weld metal deposit having the following chemical composition: C: 0.08-0.10 wt % Mn: 1.30-2.00 wt % Si: 0.35-0.60 wt % Cr: 0.60-0.80 wt % Ni: 2.50-3.00 wt % Mo: 0.30-0.80 wt % V: 0.20-0.30 wt %
    and optionally further components, in particular: Co: ≤0.02 wt % Ti: 0.01-0.02 wt % Al: ≤0.010 wt %,
    Balance: iron as well as unavoidable impurities.

    Claims

    1. A weld metal deposit comprising the following chemical composition: C: 0.08-0.10 wt % Mn: 1.30-2.00 wt % Si: 0.35-0.60 wt % Cr: 0.60-0.80 wt % Ni: 2.50-3.00 wt % Mo: 0.30-0.80 wt % V: 0.20-0.30 wt % optionally further comprising: Co: ≤0.02 wt % Ti: 0.01-0.02 wt % Al: ≤0.010 wt %, with the balance comprising iron and impurities.

    2. A weld metal deposit comprising the following chemical composition: C: 0.080-0.095 wt % Mn: 1.40-1.50 wt % Si: 0.35-0.55 wt % Cr: 0.60-0.80 wt % Ni: 2.50-3.00 wt % Mo: 0.30-0.60 wt % V: 0.20-0.25 wt % optionally further comprising: Co: ≤0.02 wt % Ti: 0.007-0.018 wt % Al: ≤0.007 wt %, with the balance comprising iron and impurities.

    3. The weld metal deposit according to claim 1, comprising the following chemical composition: C: 0.080-0.090 wt % Mn: 1.40-1.50 wt % Si: 0.40-0.50 wt % Cr: 0.60-0.70 wt % Ni: 2.70-3.00 wt % Mo: 0.50-0.60 wt % V: 0.20-0.30 wt %, preferably 0.20-0.25 wt % optionally further comprising: Co: ≤0.02 wt % Ti: 0.007-0.018 wt % Al: ≤0.007 wt %, with the balance comprising iron and impurities.

    4. The weld metal deposit according to claim 1, characterized in that the upper limit of vanadium is 0.30 wt % or 0.29 wt % or 0.28 wt % or 0.27 wt %.

    5. The weld metal deposit according to claim 1, characterized in that the lower limit of vanadium is 0.20 wt % or 0.21 wt % or 0.22 wt % or 0.23 wt % or 0.24 wt %.

    6. The weld metal deposit according to claim 1, wherein the content of further components are limited as follows: Nb: ≤0.002 wt % N: ≤0.05 wt % O: ≤0.05 wt % P: ≤0.012 wt % S: ≤0.010 wt % Cu: ≤0.3 wt %

    7. The weld metal deposit according to claim 1, characterized in that the weld metal deposit has a tensile strength Rm of greater than 1100 MPa, preferably greater than 1150 MPa.

    8. The weld metal deposit according to claim 1, characterized in that the weld metal deposit has an offset yield strength Rp0.2 of greater than 1100 MPa.

    9. The weld metal deposit according to claim 1, characterized in that the weld metal deposit has an absorbed impact energy of greater than 35 J, preferably greater than 40 J, at +20° C.

    10. The weld metal deposit according to claim 1, characterized in that the weld metal deposit has an absorbed impact energy of greater than 35 J, preferably greater than 40 J, at −20° C.

    11. The weld metal deposit according to claim 1, characterized in that the weld metal deposit has a product of tensile strength Rm and absorbed impact energy of >39500 MPa.Math.J, preferably >50000 MPa.Math.J.

    12. The weld metal deposit according to claim 1, characterized in that the weld metal deposit has an elongation at break A5 of more than 10%, preferably more than 12%.

    13. The metal powder cored welding wire comprising a filler powder and a sheath enclosing the filler powder for the production of a weld metal deposit in an arc welding process, characterized in that the metal powder cored welding wire is designed to form a weld metal deposit according to claim 1.

    14. The metal powder cored welding wire according to claim 13, characterized in that the filler powder contains arc stabilizers.

    15. The metal powder cored welding wire according to claim 13, characterized in that the weight of the filler powder makes up between 10 and 30% of the weight of the metal powder cored welding wire.

    Description

    EXAMPLES 1-4

    [0075] In Examples 1 to 4, a weld metal deposit with the alloy compositions given in Table 1 was obtained. The rest consists of iron as well as inevitable impurities.

    TABLE-US-00001 TABLE 1 Expl. 1 Expl. 2 Expl. 3 Expl. 4 C [% by weight] 0.09 0.08 0.07 0.06 Si [% by weight] 0.4 0.5 0.4 0.5 Mn [% by weight] 1.4 1.4 1.2 1.4 Cr [% by weight] 0.7 0.6 0.6 0.5 Mo [% by weight] 0.5 0.5 0.5 0.5 Ni [% by weight] 2.7 2.9 2.2 2.8 Al [% by weight] 0.006 0.005 0.005 0.005 Co [% by weight] 0.007 0.008 0.006 0.007 Ti [% by weight] 0.01 0.01 0.01 0.01 V [% by weight] 0.23 0.22 0.22 0.22 Tensile strength Rm 1197 1185 1062 1120 [MPa] Offset yield strength 1135 1127 1024 1087 Rp0.2 [MPa] Elongation at break 14.2 12.3 10.6 12.7 A5 [%] Absorbed impact energy 58 57 51 54 CV at +20° C. [J] Absorbed impact energy 50 50 41 48 CV at −20° C. [J] According to the x x invention

    [0076] In Examples 1 and 2, the content of the individual alloy elements was in the ranges according to the invention: [0077] C: 0.08-0.10 wt % [0078] Mn: 1.30-2.0 wt % [0079] Si: 0.35-0.60 wt % [0080] Cr: 0.60-0.80 wt % [0081] Ni: 2.50-3.00 wt % [0082] Mo: 0.30-0.80 wt % [0083] V: 0.20-0.30 wt % [0084] Co: ≤0.02 wt % [0085] Ti: 0.01-0.02 wt % [0086] Al: ≤0.010 wt %,

    [0087] The result was a tensile strength Rm and an offset yield strength Rp0.2 of at least 1100 MPa in each case. Furthermore, the elongation at break was over 10% and the absorbed impact energy was over 35 J both at +20° C. and at −20 C.

    [0088] In Example 3, the carbon content, the nickel content and the manganese content were reduced below the respective quantity range according to the invention. This resulted in a reduced tensile strength Rm and a reduced offset yield strength Rp0.2, both of which were below the set limit value of 1100 MPa.

    [0089] In Example 4, the carbon content and the chromium content were reduced below the respective quantity range according to the invention. This resulted in a reduced offset yield strength Rp0.2, which was below the set limit value of 1100 MPa.

    EXAMPLES 5-8

    [0090] In Examples 5 to 8, a weld metal deposit with the alloy compositions given in Table 2 was obtained. The only difference between the examples is the vanadium content. The rest consists of iron as well as inevitable impurities.

    TABLE-US-00002 TABLE 2 Expl. 5 Expl. 6 Expl. 7 Expl. 8 Expl. 9 C [% by 0.08-0.09 0.08-0.09 0.08-0.09 0.08-0.09 0.08-0.09 weight] Si [% by 0.5 0.5 0.5 0.5 0.5 weight] Mn [% by 1.4 1.4 1.4 1.4 1.4 weight] Cr [% by 0.7 0.7 0.7 0.7 0.7 weight] Mo [% by 0.7 0.7 0.7 0.7 0.7 weight] Ni [% by 2.9-3.0 2.9-3.0 2.9-3.0 2.9-3.0 2.9-3.0 weight] Al [% by 0.006 0.006 0.006 0.006 0.006 weight] Co [% by 0.007 0.007 0.007 0.007 0.007 weight] Ti [% by 0.01 0.01 0.01 0.01 0.01 weight] V [% by 0.18 0.20 0.25 0.28 0.33 weight] According to x x x the invention

    [0091] In Examples 6, 7 and 8 the V content is in the range of 0.20-0.30% by weight according to the invention. In the other examples, the V content is either below the range according to the invention (Example 1) or above (Examples 8 and 9).

    [0092] The measurement results for the tensile strength Rm and the offset yield strength Rp0.2 as a function of the vanadium content are shown in FIG. 1. FIG. 2 shows the notched impact strength as a function of the vanadium content.

    [0093] FIG. 1 shows that the offset yield strength Rp0.2 exceeds the minimum value of 1100 MPa at a vanadium content of 0.20 or higher. However, with a vanadium content of 0.33% by weight (Example 9), the notched impact strength is no longer above the minimum value of 35 J and, in particular, is not high enough to achieve a minimum absorbed impact energy of 27 J in connection with a base material of the same type (see FIG. 2). Therefore, only Examples 6, 7 and 8 meet all the requirements and are therefore considered to be embodiments according to the invention.