316　LN　L-shape　stainless　steel　is　used　in　ITER　Side　Correction　Coil　(SCC)　box.　Finite　Element　Method　(FEM)　simulation　is　adopted　to　analyze　metal　flow　characteristics,　forecast　extrusion　force　and　ascertain　extruder　tonnage　of　316　LN　L-shape　stainless　steel　during　extrusion　process.　Based　on　simulation　results,　316　LN　round　forged　billet　is　used　to　manufacture　L-shape　stainless　steel　by　extrusion　process.　The　extrusion　process　includes　circular　furnace　preheating,　induction　heating,　glass　lubrication,　mould　design　and　deformation　design.　316　LN　L-shape　stainless　steel　is　manufactured　by　Phi　360　mm　circular　container　and　60　MN　horizontal　extruder　successfully.　Mechanical　properties　and　microstructure　of　316　LN　L-shape　stainless　steel　all　accord　with　the　requirements　of　ITER　SCC　box.　SCC　box　case　is　manufactured　by　bending,　machining　and　welding　processes.　X-ray,　ultrasonic　testing　(UT)　and　penetration　testing　(PT)　are　used　to　inspect　the　welding　quality　of　SCC　box　case.　The　SCC　box　case　passes　the　acceptance　of　ITER　project　expert　group,　this　result　verifies　that　the　extrusion　process　and　manufacture　process　are　reasonable　and　feasible.