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At present, stainless steel pipe production technology includes two aspects:

1, cold rolled and cold drawn stainless steel seamless pipe,

2. EFW, ERW stainless steel welded pipe process.


The cold rolling is different from the cold drawing process. The so-called cold rolling is the pickling and phosphating on the basis of the seamless steel pipe blank, and then finish rolling on the upper cold rolling mill. The precision is high and the light is bright but the output is low, and the cold drawn steel pipe is On the basis of the seamless steel tube blank, the cold drawing machine is directly used for cold drawing, which is relatively rough in appearance but high in output, and different products are selected for different purposes.


ERW is the first letter of electric resistance welding.

The welding method of ERW pipe and submerged arc welded pipe is significantly different. The pressure welding method without filler metal is adopted. The weld is not filled with other components. The skin effect and the proximity effect of high frequency current are used to instantly heat the edge of the plate. At the soldering temperature, the weld of the forged structure is extruded by a squeeze roll. High-quality steel pipes require heat treatment on the weld line or off-line to refine the microstructure of the weld zone. The weld of the high-quality ERW welded pipe can reach the same level of toughness as the base metal, which cannot be achieved by the submerged arc welding process.

EFW is electric welding

Abbreviation for the first letter of Electric fusion welding
One of submerged arc welding (SAW)-electric welding (EFW) is a process in which metal is heated by one or several consumable electrodes and a workpiece to heat the metal. The material is fully melted and does not require pressurization. The part of the filling metal is all from the electrode.
Melt Gas Shielded Welding (GMAW) - A type of electrofusion welding (EFW) that is similar to submerged arc welding, but its protection comes from inert gases and works better.
Spiral welding - this is also a type of submerged arc welding with a spiral weld

Product material: 304 (S30408/06Cr19Ni10/0Cr18Ni9), TP304L/304L (S30403/022Cr19Ni10/00Cr19Ni10), 316L (S31608/06Cr17Ni12Mo2/0Cr17Ni12Mo2/S31603/022Cr17Ni12Mo2/00Cr17Ni14Mo2), 321 (S32168/06Cr18Ni11Ti/0Cr18Ni10Ti/), 304H, Austenitic stainless steel such as 316LTi, S31803, S32205, 2507, 310S, 904L

Product specifications: outer diameter (6-530MM) * thickness (1-100MM) (can be customized according to requirements non-standard thick wall tube)

Product standard: GB/T14976-2002 GB/T14976-2012 GB13296-2007 GB13296-2013 GB/T21833-2008 GB5310-1995 GB/T12771-2008 ASTM A312/A213 ASTM A269 ASTM A790, etc.
Special customization: brushed film, internal and external polishing, sand blasting, pickling, bright annealing, zero-cut retail, groove, sealing, and general packaging and wooden box packaging

Material: 304-321-316-316L-310S and other materials; supply and sale:  Welcome customers to visit the company to guide the work!