Scratch after grinding - 1.4104 steel

Scratch after grinding - 1.4104 steel - Cold drawing defects

Figure 1: Treatment: Annealed - ground. Magnification: 25x. Sampling/Specification: Steel bar surface. Testing result: Scratch on the ground surface going in lengthways direction.

Figure 2: Treatment: Annealed - ground. Magnification: 50x. Sampling/Specification: Transverse. Testing result: Scratch 0.03 mm deep the edges of the defect are raised lightly the defect has arisen after grinding.

Defect name: Scratch after grinding
Record No.: 479
Type of defect (Internal/Surface): Surface
Defect classification: Cold drawing defects
Steel name: 1.4104 steel
Steel composition in weight %: No data.
Note: Scratches or also grooves are light mechanical damages on the surface of the material. They can arise into the most different processing steps. In most cases the material is lead along at sharp edges which then leave a more or less strong deepening. Scratches at the ready material have to be avoided in every case. Scratches in a preliminary stage can be often still removed. In this case the scratch, groove, has reached the ready steel bar after grinding.
Rod wire 14.00 mm round - annealed, drawn, ground.
Reference: Not shown in this demonstration version.