L360N无缝钢管，L245N无缝钢管，L360N管线管，L245N管线管，我公司销售的无缝钢管、合金管、高压锅炉管、A106GR.B美标管、A333GR.6低温管、 X52管线管、L245管线管、L290管线管、L360管线管、L245NB管线管、L360NB管线管均为，附原始材质单及复印件。
https://www.bilibili.com/read/cv7587230
https://www.bilibili.com/read/cv7566865
https://www.meipian.cn/35qsqx86
https://www.bilibili.com/read/cv7673564
https://www.meipian.cn/35bmrmy1
https://www.meipian.cn/35d4wiyb
https://www.jianshu.com/p/000d76c21b02
https://www.bilibili.com/read/cv7529253