STAINLESS WIRE RODS
Grades: ER307L, ER308L, ER309L, ER316, ER430 and etc.
The specific ingredients are shown in the table below
Annealing
Strong Convection
The hood annealing furnace indirectly heats the steel through the inner hood. On the one hand, radiant heat transfer through the inner cover wall; on the other hand, heat transfer through gas convection (a circulating fan is installed at the bottom of the furnace).
Shielding Gas
The protective gas is H2:N2=3:1; hydrogen and nitrogen come from the decomposition of ammonia.
The Advantages of Using Hydrogen Protection
The density of hydrogen is 1/14 of that of nitrogen, and the thermal conductivity is 7 times that of nitrogen; the weight of hydrogen is light, its penetration ability is strong, and the heat transfer efficiency is significantly improved; the circulation of protective gas in the inner cover is increased. As a reducing gas, hydrogen can reduce FeO to iron at high temperatures. Effectively prevent decarburization of the material surface. Using hydrogen as a protective atmosphere may make recrystallization more uniform. Improve product performance.
Purpose and Function of Annealing
Reduce hardness and improve cutting performance; Improve plasticity and toughness, which is beneficial to cold deformation processing;
Refine grains, eliminate internal stress after forging and rolling, stabilize the scale, prevent deformation and cracking; Eliminate various defects and improve the organization; Prepare the organization for subsequent heat treatment such as quenching.
Common Welding Annealing Materials
ER80S-D2, ER80S-Ni1, ER80S-1CM, ER80S-Ti ant, etc.