在油炉中熔炼AZ31B镁合金 ,用熔剂保护 ,石墨模铸造圆锭。铸锭经 40 0℃× 1 2h的均匀化处理后 ,进行热挤压 ,其挤压温度为 40 0℃ ,挤压速度为 1～ 2 .5m/min ,挤压比为 1 0～ 45。共挤出了 1 1种规格的棒材、管材、型材 (工字型、槽型、角形、方形、T形等 ) ,挤压过程中均发生了动态再结晶 ,其抗拉强度σb在 2 75～ 2 85MPa之间 ,屈服强度σ0 .2　在 2 2 0～ 2 2 5MPa之间 ,延伸率δ在 1 5 %～ 1 7%之间。所制订的工艺合理 ,挤压出的棒材、管材、型材有较好的力学性能 Smelting AZ31B magnesium alloy in oil furnace, protected by flux, and graphite ingot casting ingot. After the ingot was homogenized at 40 0 ​​C for l2h, hot extrusion was carried out. The extrusion temperature was 400C, the extrusion speed was 1-2.5m / min and the extrusion ratio was 10-45. Co-extrusion of 1 1 kinds of specifications bar, pipe, profiles (I-shape, groove, angle, square, T-shaped, etc.), the extrusion process occurred in the dynamic recrystallization, the tensile strength σb in 2 75 ~ 2 85MPa, the yield strength σ0. 2 between 220 ~ 225MPa, the elongation δ between 15% ~ 17%. The process developed by the reasonable extrusion of the bar, pipe, profiles have better mechanical properties