  We report the temperature dependence of the transport critical current
density (Jc) in textured Sr1-xKxFe2As2/Fe (Sr122) tapes fabricated by an ex
situ powder-in-tube process. Critical currents were measured in magnetic fields
up to 0-15 T and/or the temperature range 4.2-30 K by using a dc four-probe
method. It was found that textured Sr122 tapes heat-treated at low temperatures
showed higher transport Jc performance due to much improved intergrain
connections. At temperatures of 20 K, easily obtained using a cryocooler, Jc
reached ~ 10^4 A/cm^2 in self field, which is the highest transport value of
ferropnictide wires and tapes reported so far. Magneto-optical imaging
observations further revealed significant and well distributed global Jc at 20
K in our tapes. These results demonstrate that 122 type superconducting tapes
are promising for high-field applications at around 20 K.
