GB/T 26492.2-2011Defects of wrought aluminium and aluminium alloy ingots and products - Part 2: Defects for roll-casting strips (English PDF)

2.1 Delamination crack laminationcrack

Casting phase with a low melting point and by the emergence of subsurface Fe, Si and other impurities are separated layered. Sometimes stratification extends to the surface, forming a cleft horseshoe

Mouth [in Figure 1a)]. Extend or extends to such surface defects called delamination crack. Delamination crack is generally separated and each of the groups

Now [as shown in Figure 1b)]. Crack organizations on both sides are quite different, the surface of the low-melting phase and less impurity phase, coarse grains, the internal low-melting phase and miscellaneous

Quality with more fine grain size.

Main causes. delamination crack is due to the casting tape during solidification, solidifying shell is less than the shear strength of the adhesive surface area and the central deformation zone

Gache attached between stress due.

a) surface b) lateral sectional

Figure 1 delamination crack

2.2 Article crack through

Roll with the surface of the curved, V-shaped or no fixed transverse crack or split, crack formation or band arranged along the rolling direction. It to

To the same airway, surface segregation, and other defects associated with coarse-grained.

The main causes.

a) feeding nozzle partial blockage;

b) local damage lips or slagging.

2.3 Tropical hotstrip

Roll with local unaffected rolling deformation, crystalline surface having a free area (Figure 2). Serious defects will penetrate the thickness, forming a hole

Hole; tropical irregular shape, with varying degrees of depression. Recessed surface irregularities, often accompanied by cracks, sometimes floating segregation

Effluent.

The main causes.

GB/T 27677-2017 | GB/T 32468-2015 | GB/T 26492.1-2011 | GB/T 45868-2025 | GB/T 26492.5-2011 | GB/T 26492.4-2011 | […]