What role does nitrogen play on stainless steel welded pipes?

- Jan 03, 2021-

Stainless steel welded pipe needs to be protected by nitrogen when welding. What is the principle of nitrogen-protected stainless steel welded pipe ?

  When the stainless steel welded pipe is welded, the weld bead in the stainless steel welded pipe is cooled in an oxygen-free environment to ensure that the inner bead is not oxidized by high temperature. The protected bead presents a white-like line instead of an oxidized red or black line. Such a weld bead is smooth and tidy, does not burst easily when bent, and is more malleable.

  The cost will be considered in production, and the cost of other pipes without internal protection will definitely increase. However, we insist on the quality as the core and insist on the use of nitrogen protection when producing stainless steel pipes. Although the addition of nitrogen gas protection increases the cost, it is a good quality guarantee for manufacturers who process stainless steel welded pipes!

Place of Origin
Brand Name
Pipeline, natural gas, auto parts, petroleum, chemical, railway, medical equipment, food equipment, electric power, ship, boiler heat exchanger
Welding Line Type
Spiral Welded
Processing Service
Bending, WELDING, Decoiling, PUNCHING, Cutting, moulding
stainless steel
Compatible Material
Air, Natural Gas, Oil Water
Grade Rating
Item Hardness
B90 Max Annealed
Item Shape
Item Temper
Lower Temperature Rating
-325 degrees_fahrenheit
Stainless Steel 304/316/316L
Metal Construction Type
Welded and Drawn
Specification Met
Structure Description
Products Description
This 316/316L stainless steel dual-certified round tubing is suitable for transport of fluids and gases in chloride environments.
The tubing is welded and drawn for a smoother bore than non-drawn welded tubing and a more consistent wall thickness than seamless
tubing. It is alloyed with molybdenum and has higher resistance to pitting and crevice corrosion in chloride environments than 304
stainless steel. The tubing is annealed to restore formability for bending or flaring the tubing and has an operating temperature
range of -325 to +1,500 degrees F. This welded and drawn round tubing meets American Society for Testing and Materials (ASTM) A269
specifications for quality assurance and is suitable for use in applications such as food and beverage preparation equipment in
wash down environments.
Metal tubing, also called fractional tubing, is used to transfer liquids, air, or solids, and it is characterized by a round shape
and a hollow center. Metal tubing is commonly made with various grades of austenitic stainless steel, aluminum, copper, brass, and
titanium materials and their alloys. Construction types include seamless, welded, or welded and drawn. Seamless tubing has no seam
or weld point, which enables it to better withstand high pressure and resist corrosion. Welded tubing, made by rolling and welding
metal sheet stock, is weaker than and not as rounded as seamless tubing, but it has a more consistent wall thickness for tighter
wall tolerances. Welded and drawn tubing, also known as "drawn over mandrel" (DOM), is typically welded tubing that is drawn
through a die and over a mandrel to create a smooth inner diameter, which gives the tubing comparable corrosion resistance to
seamless tubing while still offering welded tubing's tighter wall tolerances. Compression, vacuum, sanitary, and flared fittings
connect tubing or redirect flow in a fluid handling system. Metal tubing is used in HVAC and plumbing systems and for applications
in the aerospace, automotive, chemical processing, food and beverage, manufacturing, and medical industries.
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Production Process
Company Profile

No.92 JieFang East Road ,Cangzhou City, Hebei,P.R.China.

Packing & Delivery
1. who are we?
We are based in Jiangsu, China, start from 2003,sell to Domestic Market(00.00%). There are total about 51-100 people in our office.

2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;

3.what can you buy from us?
Stainless Steel Welded Pipe

4. why should you buy from us not from other suppliers?
we are good at OEM welded pipe, special pipe and stainless steel pipe

5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF;
Accepted Payment Currency:USD,CNY;
Accepted Payment Type: T/T,L/C;
Language Spoken:English,Chinese