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Bimetallic Tubes With Superior Corrosion Resistance

Sandvik bimetallic tubing consists of an outer component of Sandvik 2RE69 high-alloy stainless steel and an inner component of Zirconium 702, resulting in superior corrosion resistance, strength and weldability. This is why sterling silver and stainless steel tableware should never be placed together in a dishwasher at the same time, as the steel items will likely experience corrosion by the end of the cycle (soap and water having served as the chemical electrolyte, and heat having accelerated the process).
Figure 10. Pipe billet after ” forming. ERW pipes are produced from roll forming, which is an economical and highly productive method in plate concrete pumping systems forming technology. From Figure 8 , it can be seen that the stress and equivalent plastic strain on the pipe present segmented distributions.

With the increase in the span, the maximum hoop stress and the maximum tensile stress axial on the upper surface of the plate decrease significantly, as shown in Figure 17 With the increase in the span from 200 mm to 500 mm, the hoop stress decreases from 870 MPa to 340 MPa and the maximum axial tensile stress decreases from 550 MPa to 85 MPa.
According to Zhang et al. 21 , the average shear fracture strength of a bimetallic plate after explosive welding is 400 MPa. Figure 14. Maximum shear stress contours in the JCO forming process. Comparing the results of the 2D and 3D models reveals that the result of the 2D model can only present the stress distribution in the plate thickness direction, and the simulated results in this direction are consistent with those of the 3D model.

With the increase in the plate thickness from 8 mm to 23 mm, the maximum hoop stress increases from 110 MPa to 270 MPa, and the maximum axial tensile stress on the upper surface of the plate increases from 89 MPa to 250 MPa. The maximum hoop stress and the maximum tensile axial stress on the upper surface increase with increasing plate strength.
Four thickness sizes of 8 mm, 13 mm, 18 mm, and 23 mm were selected to study their influence on the stress of the bimetallic pipe after the JCO forming. As shown in Figure 12 , 0.6-0.7 s is the first downward pressing time, and the stress at this node increases rapidly with the downward pressing of the die.

The opening width of the pipe billet exhibits a linear relationship with the press amount of the JCO upper die, and the appropriate press amount can be obtained by the finite element model, which is confirmed by experiment. The effects of the process parameters, friction coefficient, and material properties on the slotting and ellipticity were studied numerically.

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