Field dissimilar metal welding technology for enhanced wear resistant high manganese steel
The present disclosure relates to a welding composition for joining high manganese steel base metals to low carbon steel base metals, as well as systems and methods for the same. The composition includes: carbon in a range of about 0.1 wt % to about 0.4 wt %; manganese in a range of about 15 wt % to about 25 wt %; chromium in a range of about 2.0 wt % to about 8.0 wt %; molybdenum in an amount of ≤ about 2.0 wt %; nickel in an amount of ≤ about 10 wt %; silicon in an amount of ≤ about 0.7 wt %; sulfur in an amount of ≤ about 100 ppm; phosphorus in an amount of ≤ about 200 ppm; and a balance comprising iron. In an embodiment, the composition has an austenitic microstructure.
1. A method of producing a weld deposit, the method comprising:
providing at least two base metals to be welded that include a high Mn steel base metal and a low carbon steel base metal, and
a welding filler metal consisting of:
carbon in a range of about 0.1 wt % to about 0.4 wt %,
manganese in a range of about 15 wt % to about 25 wt %,
chromium in a range of about 2.0 wt % to about 8.0 wt %,
molybdenum in an amount of less than or equal to about 2.0 wt %,
nickel in an amount of less than or equal to about 10 wt %,
silicon in an amount of less than or equal to about 0.7 wt %,
titanium in an amount less than or equal to about 0.7 wt %,
sulfur in an amount of less than or equal to about 100 ppm,
phosphorus in an amount of less than or equal to about 100 ppm, and
a balance of iron and impurities; and
wherein the high Mn steel base metal has a carbon content greater than the welding filler metal;
melting and cooling the welding filler metal to create a weld deposit between the high Mn steel base metal and the low carbon steel base metal.
2. The method of claim 1 , wherein the melting comprises providing a welding heat input of no more than 2.5 kJ/mm to the welding filler metal.
3. The method of claim 1 , wherein the at least two base metals comprise a portion to be welded, the portion to be welded of each of the at least two base metals having bevels of greater than 25 degrees.
4. The method of claim 1 , wherein the weld deposit has a yield strength in the as-welded condition greater than a yield strength of the low carbon steel base metal and/or the high Mn steel base metal.
5. The method of claim 4 , wherein at least one of: the weld deposit has a yield strength in the as-welded condition greater than about 60 ksi; the weld deposit has an ultimate tensile strength in the as-welded condition greater than about 70 ksi; or a combination thereof.
6. The method of claim 4 , wherein the weld deposit has a Charpy V-notch impact energy in the as-welded condition greater than about 27 J at about − 29° C.
7. The method of claim 4 , wherein a heat affected zone of the high Mn steel base metal and the low carbon steel base metal have a Charpy V notch impact energy after welding greater than about 27 J at about − 29° C.
8. The method of claim 1 , wherein the welding filler metal composition consists of: carbon in a range of about 0.1-0.3 wt %; manganese in a range of about 18.0-22.0 wt %; chromium in a range of about 3.5-6.5 wt %; molybdenum in an amount of less than about 1.5 wt %; nickel in a range of about 5.5-8.5 wt %; silicon in a range of about 0.4-0.7 wt %; sulfur in an amount less than about 100 ppm; titanium in an amount of not greater than about 0.7 wt %; and a balance of iron and impurities.