来自 Junda YouTube 频道的规格讲解视频和 Shorts 短视频。每个视频都链接到其讲解的产品页面。
2 min 52 s讲解 ·
An educational explainer on pickling and passivation of stainless steel pipe: what each treatment removes, matching the treatment to the surface condition, what a photo, ASTM A380 and ASTM A967 do and do not prove, and what to write into a pipe enquiry.
Video page奥氏体不锈钢无缝管（304 / 316L / 321 / 347H）
3 min 21 s讲解 ·
An educational explainer on the pitting resistance equivalent number: the formula term by term, a worked example, PREN ranges from published 2507 and 254SMO chemistry, what PREN does not document, and how to write a PREN requirement into a pipe enquiry.
Video page2507 超级双相钢 (UNS S32750) 无缝管
3 min 23 s讲解 ·
An educational explainer on specifying stainless steel pipe or tube: product form, dimensions, cold drawing, tube geometry, inspection and quotation documents.
Video page奥氏体不锈钢无缝管（304 / 316L / 321 / 347H）
3 min 15 s讲解 ·
An educational explainer on specifying S32750 super duplex tubing: ASTM A789 for tube, A790 for pipe, wall basis, inspection and document requirements.
Video page2507 超级双相钢 (UNS S32750) 无缝管
57 sShort ·
The short version of the pickling-versus-passivation explainer: two treatments, two targets, and an order line that still needs coverage, acceptance and responsibility.
Video page奥氏体不锈钢无缝管（304 / 316L / 321 / 347H）
52 sShort ·
The short version of the PREN explainer: the formula in three terms, one worked example, and what one nitrogen change does to the number.
Video page2507 超级双相钢 (UNS S32750) 无缝管
43 sShort ·
Stainless steel pipe and tube can look identical, but the specification language differs. State the form, standard, grade, OD, wall and drawing.
Video page奥氏体不锈钢无缝管（304 / 316L / 321 / 347H）
50 sShort ·
S32750 is a grade, not a complete tube order. ASTM A789 for tube, A790 for pipe; state the wall basis and the inspection line.
Video page2507 超级双相钢 (UNS S32750) 无缝管视频以原始语言发布，每个观看页面都附有文字稿。 每次询价均须与骏达确认具体项目的标准、尺寸、供货状态、检验文件及商务条款。
