40MnB圓鋼規(guī)格：直徑4mm5mm6mm7mm8mm9mm10mm11mm12mm13mm14mm15mm16mm17mm18mm19mm20mm21mm22mm24mm25mm26mm28mm30mm32mm35mm38mm40mm42mm45mm50mm55mmm60mm……規(guī)格齊全，更多規(guī)格請(qǐng)咨詢。