Main characteristics of LSAW steel pipe

 LSAW steel pipe (LSAW for short) is a professional expression term for straight submerged arc welding steel pipe. It is a pipe produced by using a single medium thick plate as raw material, pressing (rolling) the steel plate into a tube blank in a mold or forming machine, and expanding the diameter by double-sided submerged arc welding.

        1) The steel pipe has a longitudinal weld, and the inner and outer welds are welded by one submerged arc welding.

        2) After the overall mechanical expansion treatment, the internal stress of the steel pipe is small and evenly distributed, which can effectively prevent stress corrosion cracking, with high dimensional accuracy and is convenient for on-site welding construction.

        3) Adopting the process of pre welding and finish welding, the welding process is stable and the weld quality is high.

        4) It is easy to realize NDT during production and NDT recheck in the field during use.

        5) The product specification range is large. It can produce small diameter and large wall thickness steel pipes as well as large diameter and large wall thickness steel pipes.

How to make seamless pipe

 Seamless piping begins as a solid cylindrical hunk of steel called a billet. While still hot, billets are pierced through the center with a mandrel. The next step is rolling and stretching the hollow billet. The billet is precisely rolled and stretched until it meets the length, diameter and wall thickness as specified by the customer order.

　　Some seamless pipe types harden as they’re manufactured, so heat treatment after manufacturing is not required. Others do require heat treatment. Consult the specification of the seamless pipe type you’re considering to learn whether it will require heat treatment.

Standard For Seamless Pipe

 Standard For Seamless Pipe

Standard
GB standard	Seamless steel pipe for structural purpose	GB/T8162-2008
	Seamless steel pipe for liuid service	GB/TB8163-2008
	Seamless steel tubes for low and medium boiler	GB/3087-1999
	Seamless steel tubes for high pressure boiler	GB/5310-1995
	Seamless carbon steel marine tubes	GB/T5312-1999
	High-pressure seamless steel tubes for chemical fertilizer equipments	GB/6479-2000
ASTM standard	Black and hot-dipped zinc-coated steel pipes welded and seamless	ASTM A53
	Seamless carbon steel for high temperature service	ASTM A106
	Seamless cold-drawn low-carbon steel heat exchanger and condenser tubes	ASTM A179
	Seamless carbon steel boiler tubes for high pressure	ASTM A192
	Seamless Medium-carbon boiler and superheater tubes	ASTM A210
	Seamless carbon for mechanical tubing	ASTM A519
API standard	Seamless steel pipe for casing	API Spec 5CT
	Seamless steel pipe for line pipe	API Spec 5L
DIN standard	Seamless steel tube for elevated temperture	DIN 17175
	Cold drawn seamless prevision pipe	DN2391
	Seamless circular unalloyed steel tubes subject to special requirements	DIN 1629

How to Clean Surface Defects of Pipe Blank

      The quality of the tube blank has an extremely important influence on the quality of the seamless steel tube. Any tube blank that does not meet the quality requirements must not be fed. The surface defects of the tube blank must be removed.

　　1. Tube blank quality inspection method:

　　a. Visual inspection: surface quality

　　b. Low magnification organization: sulphur printing, acid leaching, industrial hydrochloric acid or copper chloride solution check cracks, bubbles, loose, white spots, inclusions and other distribution.

　　2. Clearance of tube blank surface defects:

　　a. Flame cleaning:≤0.4%c Surface defects of tube blank.

　　b. Air shovel cleaning: suitable for the cleaning of local defects on the surface of tube blanks.

　　c. Wheel cleaning: mainly used for tube blanks that should not be used for flame cleaning.

　　d. Turning and cleaning: It is mainly used for the cleaning of surface defect of pipe blanks with high added value and quality requirements, such as stainless steel blanks, rust blanks: such as P91 and P92.

　　In short, the inspection and inspection of the quality of the tube blanks and the necessary cleaning of the surface defects of the tube blanks are the basic prerequisites for ensuring that the blanks used in the production of seamless steel tubes meet the quality requirements.

Application Of LSAW Pipe

       1. According to the specification of pipe API 5L Spec, we take testing for the basic metal and welding metal. Meanwhile, we have other Specifications. Such as DIN, EN, ASTM, and GOST. Also, the LSAW steel pipe can welded with flanges. Welding lifting eyes and other parts according to clients’ requirements.

　　2. It also can used as pipe boots or pile boots which acted as protecting a section.

　　3. Except used as pipe boots. The LSAW steel pipe is also used for transporting fluids like water, oil & gas. As well as used for offshore projects and underground constructions. These products are producing in China. And exported to other countries. For example Australia, Canada, South American, Europe, Malaysia, India, Pakistan, Africa, etc.