Control Line Tubes in stainless steel or nickle alloy for Downhole and Subsea

Control Line Tube Brief Introduction

Control line tubes and chemical injection lines usually are coiled tubes made of stainless steel, duplex stainless steel or nickle alloys. There are three main forms, including welded & redrawn tube, welded and floating plug redrawn and seamless tube. 

Control line tubing is widely used in applications as 

  • Downhole hydraulic control lines
  • Downhole chemical control lines
  • Subsea control lines for hydraulic power and chemical injection lines
  • Flowline control
  • Instrumentation
  • Smooth inner surface control lines used in fibre optic applications

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Stainless steel tubing for pure gas delivery | Stainless Steel Gas Lines

Stainless steel gas tube for pure gas lines mostly are stainless steel bright annealed tubes or stainless steel mechanical polished tubes. And for ultra high purity gas tubing, people will usually use electropolished stainless steel tubing (EP tubes).

Younglee’s precision steel tube factory manufactures and supplies a wide range of stainless steel gas tubes for gas delivery (gas convey) and gas distribution, especially designed for high purity gas convey systems. 


Our stainless steel gas tubing is produced according to ASTM A 269, A270, A632, or EN ISO standard EN 10216-5.

Materials of stainless steel gas tube

Mostly the most popular material of stainless gas tube is AISI 316L, because 316L stainless steel tubing has stable composition and high performance of corrosion resistance, which greatly ensure the purity of the gas in the tubing.

Besides 316L stainless steel tubing, we also manufactures stainless steel high purity tubing in materials of 304 / 304L, 316 Ti, 321 /321H and so on. 
Besides ASTM standards, we also produce pure gas tubing in stainless steel grades according to EN standard as 1.4401 /1.4404, 1.4301/1.4307, 1.4541, 1.4571 etc.

High Purity Stainless Steel Tube Sizes

We produce and supply stainless steel pure tubes in metric sizes and imperial sizes. The size range of our high performance stainless steel tubing is O.D 5 mm to O.D 50.8 mm.

Inch Stainless steel tubing sizes chart

Size (inch)O.D.(Inch)Wall thickness (inch)Maximum Safe Working Pressure Rate
PSI Bar 

We also supply other stainless steel tubing sizes upon customer’s request.

Metric mm stainless steel tube sizes chart

O.D.(mm)Wall thickness (mm)O.D.(mm)Wall thickness (mm)

Surface Finishing & Surface Roughness

 Younglee’s supplies stainless steel gas tubing in below three surface finish upon customers’ requirements.

·  Bright annealed (BA tube)

Bright annealed stainless steel tubing is supplied with bright inner surface and outer surface. The surface roughness of tube inner can be Ra 0.3 μm to 0.8 μm upon customers’ request.

·  Mechanical polished 

Inner mechanical polished tubing is supplied with surface roughness max. Ra 0.6 μm.

·  Electropolished (EP tube)

Electropolishing stainless steel tubing is mostly used as ultra high purity stainless steel tubing. The roughness of EP tube can be as good as surface roughness Ra 0.2 μm.


In various industries, when pure gas delivery or pure gas distribution is needed, people will mostly use stainless steel gas tubing. For example, when building a biology lab or a chemical laboratory, normally people will need stainless steel tubes to build the laboratory gas lines, these tubes are known as lab supply gas tubing. The application industrial fields including below.

  • Laboratory engineering: Lab gas lines, Lab gas tubes
  • Semiconductor industry: 

HOOK-UP BA tube, HOOK-UP EP tube, HOOK-UP stainless steel tube, HOOK-UP CDA stainless steel tubes.

  • Pharmaceuticals
  • High purity gas industry
  • Food & Beverage industry
  • Bulk Gas industry
  • Fine Chemical industry
  • Precision Instruments
  • CDA industry
  • Special gas industries



High Purity Stainless Steel Tubing | High Purity Gas Tube

High Purity Stainless Steel Tubing | High Purity Gas Tube | High Purity Pipe Fittings

High purity stainless steel tubing is widely used in various industries where high purity, high cleanliness, and high performance are critical required, such as semiconductor industry, sports, pharmaceuticals, laboratory engineering, high purity gas industry, and more. As mostly this kind of tubing is mostly used to deliver various kinds of high purity gas for different applications, it is also known as high purity gas tubing as well.

As one of the top quality China precision stainless steel tube manufacturers, Younglee produces and supplies high purity tubes in a wide range of metric sizes and imperial sizes. Our customers include many respected companies in China & oversea countries.

Details of high purity stainless steel tubing

Ultra High purity stainless steel tubing


We produce and supply high purity tubing in stainless steel of EN DIN steel grades and AISI /UNS steel grades.

AISI / UNS steel grades: 316 / 316L, 304 / 304 L, 316Ti, 2205, S31803

EN DIN steel grades: 1. 4401 / 1.4404 /1.4435, 1.4301 /1.4307, 1.4462

316L high purity tubing is the most popular, also we produce other materials of high purity tubes on customer’s requests.

Size Range:

Tubing metric size: O.D 6 mm to O.D 120 mm, W.T 0.5 mm to 10 mm

Imperial size tubes: O.D 1/4″ to 6″

The most popular size range of the high purity stainless steel tubing is between O.D 6 mm (1/4″) to O.D 50 mm (2″), and we can supply the high purity tubes with random length or fixed length 1 meter to 8 meters.

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