1. Plate probe: after the steel plate used for manufacturing large diameter saw straight seam steel pipe enters the production line, the full plate ultrasonic inspection shall be carried out first;

2. 銑邊：通過銑邊機對鋼板兩邊緣進行雙面銑削，使之達到要求的板寬、板邊平行度和坡口形狀；

2. Edge milling: the two edges of the steel plate are milled on both sides by the edge milling machine to achieve the required plate width, plate edge parallelism and groove shape;

3. 預彎邊：利用預彎機進行板邊預彎，使板邊具有符合要求的曲率；

3. Pre bending: pre bending machine is used to pre bend the plate edge, so that the plate edge has the required curvature;

4. 成型：在JCO成型機上首先將預彎后的鋼板的一半經過多次步進沖壓，壓成"J"形，再將鋼板的另一半同樣彎曲，壓成"C"形，形成開口的"O"形

4. Forming: on the JCO molding machine, the half of the pre bent steel plate is firstly pressed into "J" shape by multiple step stamping, and then the other half of the steel plate is also bent and pressed into "C" shape, and finally an open "O" shape is formed

5. 預焊：使成型后的直縫焊鋼管合縫并采用氣體保護焊（MAG）進行連續焊接；

5. Pre welding: weld the formed straight seam welded steel pipe and use gas shielded welding (MAG) for continuous welding;

6. 內焊：采用縱列多絲埋弧焊（更多可為四絲）在直縫鋼管內側進行焊接；

6. Internal welding: longitudinal multi wire submerged arc welding (up to four wires) is used to weld the inside of straight seam steel pipe;

7. 外焊：采用縱列多絲埋弧焊在直縫埋弧焊鋼管外側進行焊接；

7. External welding: longitudinal multi wire submerged arc welding is used to weld the outside of LSAW steel pipe;

8. 超聲波檢驗Ⅰ：對直縫焊鋼管內外焊縫及焊縫兩側母材進行100%的檢查；

8. Ultrasonic inspection I: 100% inspection of internal and external welds and base metal on both sides of longitudinal welded steel pipe;

9. X射線檢查Ⅰ：對內外焊縫進行100%的X射線工業電視檢查，采用圖象處理系統以保證探傷的靈敏度；

9. X-ray inspection I: 100% X-ray industrial TV inspection shall be carried out for the internal and external welds, and the image processing system shall be used to ensure the sensitivity of flaw detection;

10. 擴徑：對埋弧焊直縫鋼管全長進行擴徑以提高鋼管的尺寸精度，并改善鋼管內應力的分布狀態；

10. Expanding: the full length of saw straight seam steel pipe is expanded to improve the dimensional accuracy of the pipe and improve the distribution of internal stress in the pipe;

11. 水壓試驗：在水壓試驗機上對擴徑后的鋼管進行逐根檢驗以保證鋼管達到標準要求的試驗壓力，該機具有自動記錄和儲存功能；

11. Hydraulic test: the expanded steel pipes are inspected one by one on the hydraulic testing machine to ensure that the steel pipes meet the test pressure required by the standard. The machine has the function of automatic recording and storage;

12. 倒棱：將檢驗合格后的鋼管進行管端加工，達到要求的管端坡口尺寸；

12. Chamfering: process the qualified steel pipe end to meet the required groove size;

13. 超聲波檢驗Ⅱ：再次逐根進行超聲波檢驗以檢查直縫焊鋼管在擴徑、水壓后可能產生的缺陷；

13. Ultrasonic inspection II: ultrasonic inspection shall be conducted one by one again to check the possible defects of longitudinal welded steel pipe after expanding and water pressure;

14. X射線檢查Ⅱ：對擴徑和水壓試驗后的鋼管進行X射線工業電視檢查和管端焊縫拍片；

14. X-ray inspection II: conduct X-ray industrial TV inspection on the steel pipe after expanding and hydrostatic test and film the weld seam at the pipe end;

15. 管端磁粉檢驗：進行此項檢查以發現管端缺陷；

15. Magnetic particle inspection of pipe end: this inspection is carried out to find defects at pipe end;

16. 防腐和涂層：合格后的鋼管根據用戶要求進行防腐和涂層。

16. Anti corrosion and coating: the qualified steel pipe shall be anticorrosive and coated according to the requirements of users.