что формирование технологии бесшовной трубы квадратного сечения и ее приложения?

Wall thickness of seamless steel pipe is relatively thick, relatively small diameter thick. But the diameter is restricted, and its applications are limited, and production costs, especially for large diameter seamless steel pipe production costs are relatively high. There are mainly three kinds of forming technology of seamless square tube: Горячекатаный, cold-drawn and welded. для
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