  The industrial manufacturing of the long-length iron-pnictide wires and tapes
requires simple and low-cost technology. Although the transport critical
current density of the FeAs-122 tapes has already achieved the practical
application level, their fabrication procedures are relatively complicated or
required specialized instruments. Ag-sheathed Ba0.6K0.4Fe2As2 superconducting
tapes were fabricated by the scalable rolling process. At 4.2 K and 10 T, the
critical current density Jc has achieved 5.4x10^4 A/cm2. We ascribe the
excellent performance to the high purity and homogeneity of the superconducting
phase, high density and high c-axis texture of the superconducting core. Our
method provides a simple way to scale up the production of the long-length
iron-based superconducting tapes with high Jc.
