1. Stainless seamless tube
2.Stainless welded tube
Specifications of Stainless Steel 201 Tubes:
1. Standard: GB, ASTM, JIS, DIN
2. Grade: 201,202,301, 321, 304, 304L, 316, 316L, 409, etc
3. OD range: 8mm-279.4mm
4. Wall thickness range: 0.3mm-30mm
5. Length: max.18000mm or as demand
6. Surface finish: Polishing (180#,220#,240#,320#400#,600#), Hairline, aid pickling No.1 and so on
7. Manufacture technology: cold drawn/cold rolled
8. Type: Seamless & Welded
200 Series stainless steel is a kind of austenitic stainless steel. Mn and N are added to replace some part of Ni, but they still contain some proportion of Ni, Normally it contains 4% to 6% percent. Mn is used to stable austenitic stainless steel; N is used to increase the hardness. Therefore, 200 series stainless steel is widely used in the equipment or parts that need undertake high pressure and do not have a very requirement for corrosion resistance.
Grade and Main chemical composition Item C Si Mn P≤ S≤ Cr Mo Ni Other SUS201 ≤0.15 ≤1.00 5.5-7.5 0.06 0.03 16-18 - 3.5-5.5 N≤0.25 SUS202 ≤0.15 ≤1.00 7.5-10.0 0.06 0.03 17-19 - 4.0-6.0 N≤0.25
1. Raw material choices.
All of raw stainless steel coils are from YUSCO, Baosteel, TISCO.
From slitting to production, we care more about the tolerance and raw material mechanical parameters to guarantee the tube quality control.
2. Various mold choices
With years of development, shanghai Yieh United Corporation is able to produce various OD tubes with different thickness.
For OD<50mm, Shanghai Yieh United Corporation has induced automatic welding machine. The daily production is 150 tons.
For OD>50mm，Shanghai Yieh United Corporation apply advantageous manual welding process.
3. Surface Polishing.
Shanghai Yieh United Corporation can offer different tube and pipe surface from No.1 to #400 surface based on customers' requirement.
4. Pipe Surface Pickling.
5. Quality Control(Water pressure check)
For every welded tube diameter <50mm, Shanghai Yieh United Corporation strictly test every welded tube in order to guarantee the quality for our customers.
Applications of Stainless Steel Pipes/Tubes:
1).Petroleum, Chemical enterprise, super heater of boiler, heat exchanger
- For tubes, Shanghai Yieh United Corporation offer polishing and bending service.
1. polishing surface(No.4, 8K)
2. Bending(based on customers' requirement)
This is Shanghai Yieh United Corporation standarded package.
Curently, Shanghai Yieh United Corporation has three different production lines including welding, cold drawing, and cold rolling.
2. Cold drawin and Cold rolling for seamless stainless steel tube and pipe.
Based on customers requirement, Shanghai Yieh United Corporation has two production lines.
For OD<100 mm, cold rolling is applied to guarantee the surface and tolerance requirement.
For OD> 100mm, cold rolling is applied to reach the tube diameter.
The overall production Process:
Every batch from Shanghai Yieh United Corporation has been tested with meticulous experiment.