Heat treatment can improve the quality of products, stainless steel wire surface quality is good or bad, mainly depends on the heat treatment after pickling process, this article about the relationship between the surface quality and heat treatment of stainless steel wire.
(1) if the stainless steel wire surface scale thickness is not uniform, the thick and thin places below the substrate metal surface finish is different also, and the dissolution of surface and pickling surface scale scale attached to parts of the matrix metal by acid erosion degree is different, so, stainless steel wire surface is not uniform. When heated, therefore, in the heat treatment must be evenly to form scale, to achieve one to, involving the following conditions, should take note:
If heating oil adhered on the surface of the workpiece, the oil attached parts of the oxide coating thickness and other parts of the oxide coating thickness and composition are different, and can produce carburizing. Subcutaneous matrix metal oxide were part of carburizing will severely eroded by acids. The initial burning of heavy oil burner jet of oil droplets, if attached to the workpiece, the influence is very big also. Operating official’s fingerprint adhesion when also can have influence on the artifact. So, don’t touch by hand directly stainless steel bath for big shots, don’t make the workpiece with new oil surface during cold working of lubricating oil and so on, if any, must be in trichloroethylene full degreasing degreasing agent, caustic soda solution and then wash with warm water, then heat treatment.
(2) if the workpiece surface is sundry, especially organic matter or ash attached workpieces, heating, of course, will have an impact on the scale.
(3) of oil or gas flame direct contact with the surface of the stainless steel and no contact with the local scale is different. So, must make when heating processing a mouth don’t direct contact with the flame.
(4) if the deal with a local before heat treatment with residual scale, scale after heating the remaining parts and not the part of the scale, there will be differences in thickness and composition of scale, cause after pickling surface uneven, so not only should pay attention to the final heat treatment, but also to fully pay attention to the intermediate heat treatment and pickling.
(5) the surface finish is not at the same time, if the surface finish is different, even if the same heating and scale of its surface is rough and fine place is not the same. Defects, for example, in the local place and not after cleaning, the formation of oxide skin condition is different, so cause the uneven surface after pickling.
(6) the difference in furnace atmosphere in furnace atmosphere at the local, the formation of scale will also have change, this is also the cause of uneven after pickling. So, when heated, each part of the furnace atmosphere must be the same. Therefore, must also take into account the atmosphere circulation.