Minimal line icons for blacksmithing and metalworking tools

A clean black line icon set arranged on a white background, showing four separate symbols related to blacksmithing and metalworking. The top left icon depicts a forge or furnace with heat rising above it and flames inside the opening. At top right, an anvil is shown in simple outline with a small spark accent near the horn. The lower left icon shows stacked metal ingots, while the lower right combines a pouring ladle with molten metal flowing into a mold. Strong contrast and generous negative space give the illustration a technical, catalog-ready look. The simplified style works well for industrial design themes, safety materials, or craft and fabrication content.