请问ASTM A106B对应国内哪个牌号?是不是20#?
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![请问ASTM A106B对应国内哪个牌号?是不是20#?](/uploads/image/z/4657284-36-4.jpg?t=%E8%AF%B7%E9%97%AEASTM+A106B%E5%AF%B9%E5%BA%94%E5%9B%BD%E5%86%85%E5%93%AA%E4%B8%AA%E7%89%8C%E5%8F%B7%3F%E6%98%AF%E4%B8%8D%E6%98%AF20%23%3F)
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