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Stainless Steel Electropolished Pipe

Electropolished Stainless Steel Tubing is used for biotechnology, semiconductor and in pharmaceutical applications.

Material : Stainless Steel: 316LV+V / 316L / 316 / 304L / 304, Alloy Steel: HC-22

Type: welded / seamless

Specification : JIS / ASTM
Size : 1/4”~6”/ 15A~850A
Thickness : 5S~40S
Surface : EP / BA / MPS / AP
Purity : UHP / HP

Length : 4 meters / 6 meters / 20 feet


*For more technical requirements and dimension specifications, please contact us to obtain support from our Engineering Department.

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Specifications & Grades

  • ASTM SA/A270

    Grade:TP304,TP304L,TP316,TP316L,TP321
    More Details
  • ASTM SA/A269

    Grade:TP304, TP304L, TP304LN, TP316, TP316L, TP316LN TP317, TP321, TP347, TP348, S31254
    More Details
  • ASTM SA/A213

    Grade:TP304, TP309S, TP310H, TP316L, TP317, TP321, TP347
    More Details

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Description

Dimensions Chart, 15A-800A (Unit=mm)

Nominal Size

Outside  Diameter

Wall Thickness

t(t1, t2)

Type of Pipe

Surface Treatment / ID Polishing Method

5S

10S

Seamless

Welded (ID Bead Cut)

15A

21.7

1.65

2.1

Longitudinal

20A

27.2

1.65

2.1

Longitudinal

25A

34.0

1.65

2.8

Longitudinal

32A

42.7

1.65

2.8

Longitudinal

40A

48.6

1.65

2.8

Longitudinal

50A

60.5

1.65

2.8

Longitudinal

65A

76.3

2.1

3.0

◎ (YES)

Spiral / Longitudinal

80A

89.1

2.1

3.0

◎ (YES)

Spiral / Longitudinal

100A

114.3

2.1

3.0

◎ (YES)

Spiral / Longitudinal

125A

139.8

2.8

3.4

◎ (YES)

Spiral

150A

165.2

2.8

3.4

◎ (YES)

Spiral

200A

216.3

2.8

4.0

◎ (YES)

Spiral

250A

267.4

3.4

4.0

◎ (YES)

Spiral

300A

318.5

4.0

4.5

◎ (YES)

Spiral

350A

355.6

4.0

4.8

◎ (YES)

Spiral

400A

406.4

4.2

4.8

◎ (YES)

Spiral

450A

457.2

4.2

4.8

◎ (YES)

Spiral

500A

508.0

4.8

5.5

2  (YES)

Spiral

550A

558.8

4.8

5.5

2  (YES)

Spiral

600A

609.6

5.5

6.4

2  (YES)

Spiral

800A

812.8

6.4

7.9

2  (YES)

Spiral

●"2" means "two seams" welded pipe.


Dimensions Chart, 1/8"-6" (Unit=mm)

Nominal Size

Outside  Diameter

Wall Thickness

Type of Pipe

Surface Treatment / ID Polishing Method

Seamless

Welded (ID Bead Cut)

1/8”

3.18

0.7

1/4”

6.35

1.0

3/8”

9.52

1.0

1/2”

12.7

1.0,1.24

5/8”

15.88

1.24,1.65

3/4”

19.05

1.24,1.65

1”

25.4

1.65

◎ (Option)

Longitudinal

1-1/4”

31.8

1.65

◎ (Option)

Longitudinal

1-1/2”

38.1

1.65

◎ (Option)

Longitudinal

2”

50.8

1.65

◎ (Option)

Longitudinal

2-1/2”

63.5

1.65

◎ (Option)

Longitudinal

3”

76.2

1.65

◎ (Option)

Spiral / Longitudinal

4”

101.6

2.11

◎ (Option)

Spiral / Longitudinal

5”

127.0

2.77

◎ (Option)

Spiral

6”

152.4

2.77

◎ (Option)

Spiral


Product Type and Grade

Product Grade

Material

AP

304, 304L, 316L

MP (BA)

304L, 316L

EP

316L

 

Specification of Chemical composition

Standard value

C

(wt%)

Si

(wt%)

Mn   (wt%)

P

(wt%)

S

(wt%)

Ni

(wt%)

Cr

(wt%)

Mo   (wt%)

ASTM A269 TP316L

≤0.035

≤1.00

≤2.00

≤0.045

≤0.030

10.00~15.00

16.00~18.00

2.00~3.00

ASTM A269 TP304L

≤0.035

≤1.00

≤2.00

≤0.045

≤0.030

8.00~12.00

18.00~20.00

ASTM A269 TP304

≤0.080

≤1.00

≤2.00

≤0.045

≤0.030

8.00~11.00

18.00~20.00

JIS G3459 SUS 316L TP

≤0.030

≤1.00

≤2.00

≤0.045

≤0.030

12.00~16.00

16.00~18.00

2.00~3.00

JIS G3459 SUS 304L TP

≤0.030

≤1.00

≤2.00

≤0.045

≤0.030

9.00~13.00

18.00~20.00

JIS G3459 SUS 304 TP

≤0.080

≤1.00

≤2.00

≤0.045

≤0.030

8.00~11.00

18.00~20.00

 

Tolerance of Dimensions

Description

Size

Tolerance

Outside Diameter

<38.1mm

±1%

≥38.1mm, <88.9mm

±1%

≥88.9mm, <139.8mm

±1%

≥139.8mm

±1%

Wall Thickness

<2.1mm

±10%

≥2.1mm

±12.5%

Length

6000mm or 4000mm

As mill Standard

 

Manufacturing Process of AP, MP (BA) and EP

Grade Of Finish of Pipes

AP Finish

MP (BA) Finish

EP Finish

ID bead-cut, bead removed

Option

YES

ID mechanical polishing

NO

YES

RO Water Cleaning

YES

YES

DI Water Cleaning

NO

YES

YES

Chemical Passivation

YES

YES

YES

Clean Room, Class 1000 Cleaning and Bagging

Option

YES

YES

Double Sleeve Bagging

Option

YES

YES

 

Inspection Criteria

Grade Of Finish of Pipes

ID Surface Roughness, Ra

Oil Residual

Particle Level

AP Finish

0.1mg/ft²

MP (BA) Finish

OD 2” Ra0.38μm

0.1mg/ft²

>0.1μm, Max. 5PC

OD 2.5”-6” Ra0.5μm

EP Finish

OD 4” Ra0.25μm

0.01mg/ft²

>0.1μm, Max. 1PC

Manufacturing Process

Electropolishing
Electropolishing is a process that uses a metal workpiece as an anode and performs electrolysis in a suitable electrolyte to selectively remove its rough surface and improve the surface finish, it is also called Electrochemical or anodic polishing.

Theory
During electropolishing, current flows on the surface of the metal product as the anode, which will form an oxide film, a salt film, or an oxygen adsorption layer on the surface, so that the metal dissolution rate of the anode drops sharply, that is, in a passive state. But this passivation film layer may be dissolved in the electrolyte, and the anode is reactivated. At a certain current density, metal passivation and metal dissolution proceed alternately.

Electrolyte
The electrolyte usually uses phosphoric acid as the main component, and it also needs to add certain oxidants (such as sulfuric acid, chromic anhydride, etc.). Without electricity, the electrolyte should have no significant corrosive effect on the metal being polished. It also requires that the electrolyte has a high solubility for the anode dissolution product and is easily removed. In addition, the electrolyte is required to have good stability, low cost and low toxicity. If necessary, a small number of organic substances (such as glycerin, methylcellulose, etc.) can be added to the electrolyte as a corrosion inhibitor. Use perchloric acid-acetic acid electrolyte for electropolishing to obtain a high-finish surface.

Process
After being energized, a polarized film is formed on the surface of the polished metal, allowing metal ions to diffuse through this thin flag. The current density of microscopic and macroscopic bumps or rough spots on the surface and the burr area is greater than the rest of the surface, and it dissolves at a faster rate to achieve the purpose of leveling and deburring. By prolonging the polishing time, and increasing the polishing temperature and current density, a bright surface can be obtained.

Mechanical Polishing
Mechanical Polishing is a process of grinding the surface of the metal using an abrasive belt and mechanical tools at multiple stages to achieve a desired smooth surface and roughness value, meanwhile, it alters the microstructure of the surface.
Stainless steel tubing is polished mechanically to pass through a set of abrasive wheels and tapes with a polishing machine, with polishing paste to improve polishing efficiency, finally, this process makes the desired polishing level using the different grinding belts to remove the surface layer.
There are Dry and Wet mechanical polishing for selecting, wet style is a better option.

Mechanical Polishing Vs. Electropolishing
Mechanical Polishing and Electropolishing are the main methods to polish stainless steel tubing, mechanical polishing performs well for general industries, when a higher polishing level is required, like in the pharmaceutical and semiconductor industries, Electropolishing has its advantages.
  • Improve Cleanability
  • Enhance Durability
  • Improve Sterility
  • Increase Corrosion Resistance

Mechanically polished surfaces retain the basic alloy composition with only slight depletion of the other alloy elements, whereas electropolished surfaces contain essentially only chromium and iron, and no stress resides.
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