In　order　to　achieve　high　strength　and　toughness　in　bainite　steel,　the　authors　carried　out　a　study　on　their　self-developed　CB10　steel.　The　CB10　steel　was　heat-treated　at　different　tempering　temperatures　to　control　its　microstructure　and　mechanical　capabilities,　and,　further,　changes　in　its　structure　were　explored.　The　results　showed　that　bainite,　ferrite,　and　M/A　islands　could　be　engendered　when　CB10　steel　was　tempered　at　250　degrees　C,　450　degrees　C,　600　degrees　C,　and　670　degrees　C,　respectively.　With　an　increase　in　tempering　temperature,　lath-type　bainite　began　to　merge　and　coarsen　obviously,　and　polygonal　ferrite　appeared.　When　the　tempering　temperature　was　above　600　degrees　C,　recovery　and　recrystallization　occurred　in　some　regions.　In　particular,　the　mechanical　properties　of　CB10　steel　were　best　at　a　450　degrees　C　tempering　temperature;　among　them,　its　tensile　strength　was　632　MPa,　its　yield　strength　was　487　MPa,　elongation　was　25%,　and　the　Charpy　absorbed　energy　was　＞140　J.　Furthermore,　the　anti-hydrogen-induced　cracking　performance　and　weldability　of　CB10　steel　were　tested.　The　results　indicated　that　there　were　no　cracks　on　the　surface　of　the　sample,　indicating　that　it　has　excellent　anti-hydrogen-induced　cracking　performance　and　weldability.　Moreover,　the　maximum　hardness　of　the　heat-affected　zone　was　231　Hv,　the　maximum　Charpy　absorbed　energy　was　285.0　J,　and　the　fracture　morphology　was　in　all　cases　ductile　fracture　when　the　impact　temperature　was　above　-60　degrees　C.