WFT-40无缝奶筒如图1所示。材料为3 m m厚的L2铝板,其铝含量不小于99.6％,硅含量不大于0.25％,铁含量不大于0.16％,铜含量不大于0.01％。其机械性能应满足:强度极限σ_ b=80.7N/m m~2,屈服极限σ_s=72.5N/m m~2,最大延伸率δ=39％,断面收缩率ψ=76％,硬度HB=19—23,塑性应变比γ=1.01,硬化指数n=0.267。由于是食用盛具,所以要求内、外表面光洁,无皱 WFT-40 seamless milk tube shown in Figure 1. The material is a 3 m thick L2 aluminum plate with an aluminum content of not less than 99.6%, a silicon content of not more than 0.25%, an iron content of not more than 0.16% and a copper content of not more than 0.01%. Its mechanical properties should meet: the strength limit σ b = 80.7N / mm ~ 2, the yield limit σ_s = 72.5N / mm ~ 2, the maximum elongation δ = 39%, the reduction of area ψ = 76%, the hardness HB = 19- 23, plastic strain ratio γ = 1.01, and hardening index n = 0.267. Because it is edible Shengju, so the requirements inside and outside the surface smooth, wrinkle-free