Double Submerged Arc Welded Pipes For Enhanced Structural Integrity

Short Description:

This part of this European Standard specifies the technical delivery conditions for cold formed welded structural, hollow sections of circular, square or rectangular forms and applies to structural hollow sections formed cold without subsequent heat treatment.

Cangzhou Spiral Steel Pipes Group Co., Ltd supplies hollow section of circular forms steel pipes for structure.

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Introduce:

In the field of structural engineering, the importance of using quality materials and construction methods cannot be overstated. Among the various components used in construction projects, pipes play a vital role. We will shed light on the importance of double welded pipes and explore their features, benefits and how they can help enhance structural integrity.

Learn about double welded pipes:

Double welded pipe, also known as double submerged arc welded pipe (DSAW Pipes), is manufactured using the submerged arc welding process. The technology involves longitudinally fusing two separate steel plates, providing a strong and continuous connection. These pipelines are primarily used in high-pressure applications, groundwater and natural gas pipelines, oil exploration, and offshore platforms.

Mechanical Property

steel grade	minimum yield strength Mpa		Tensile strength		Minimum elongation %	Minimum impact energy J
steel grade	Specified thickness mm		Specified thickness mm		Specified thickness mm	at test temperature of
	＜16	＞16≤40	＜3	≥3≤40	≤40	-20℃	0℃	20℃
S235JRH	235	225	360-510	360-510	24	-	-	27
S275J0H	275	265	430-580	410-560	20	-	27	-
S275J2H	275	265	430-580	410-560	20	27	-	-
S355J0H	365	345	510-680	470-630	20	-	27	-
S355J2H						27	-	-
S355K2H						40	-	-

Enhance structural integrity:

The key reason for using double welded pipe is their ability to enhance structural integrity. With seamless and strong welds, these pipes offer superior stress resistance and durability. The double weld ensures that the pipe can withstand higher pressure levels, making it ideal for critical applications where a single weld may compromise structural safety. This dual welding process eliminates the possibility of leaks or cracks, ensuring the long-term reliability of your piping system.

Higher strength to weight ratio:

Double welded pipe offers an excellent strength to weight ratio. Due to the welding process, these pipes have reduced wall thickness and are lighter while maintaining structural rigidity. This strength-to-weight ratio advantage minimizes the total load on the supporting structure, making it a cost-effective solution for large-scale projects such as bridges, towers, and high-rise buildings.

Corrosion resistance:

Another significant advantage of double welded pipe is its corrosion resistance. A tight welded seal creates a strong barrier against external factors, including moisture, chemicals and soil properties. This prevents the inner surface of the pipe from coming into direct contact with corrosive agents, ensuring a longer service life compared to conventional pipes. The corrosion-resistant properties of these pipes are particularly beneficial to the oil and gas industry, where pipes often encounter harsh conditions.

Chemical Composition

Steel grade		Type of de-oxidation a	% by mass, maximum
Steel name	Steel number	C	C	Si	Mn	P	S	Nb
S235JRH	1.0039	FF	0,17	—	1,40	0,040	0,040	0.009
S275J0H	1.0149	FF	0,20	—	1,50	0,035	0,035	0,009
S275J2H	1.0138	FF	0,20	—	1,50	0,030	0,030	—
S355J0H	1.0547	FF	0,22	0,55	1,60	0,035	0,035	0,009
S355J2H	1.0576	FF	0,22	0,55	1,60	0,030	0,030	—
S355K2H	1.0512	FF	0,22	0,55	1,60	0,030	0,030	—
a. The deoxidation method is designated as follows: FF: Fully killed steel containing nitrogen binding elements in amounts sufficient to bind available nitrogen (e.g. min. 0,020 % total Al or 0,015 % soluble Al). b. The maximum value for nitrogen does not apply if the chemical composition shows a minimum total Al content of 0,020 % with a minimum Al/N ratio of 2:1, or if sufficient other N-binding elements are present. The N-binding elements shall be recorded in the Inspection Document.

Efficient traffic characteristics:

The smooth, uninterrupted inner surface of the double welded pipe allows for efficient flow characteristics. Unlike other types of pipes that have internal protrusions or obstructions, these pipes ensure continuous and even flow of fluid or gas, thereby minimizing friction losses. The efficient flow characteristics of double welded pipe help optimize the performance of a variety of industrial processes, including petrochemical plants, refineries and water treatment facilities.

In conclusion:

In conclusion, double welded pipe is an important component that significantly enhances the structural integrity of various construction projects. Their unique properties, including seamless welds, higher strength-to-weight ratio, corrosion resistance and efficient flow, make them the first choice for applications requiring reliability, durability and cost-effectiveness. By using double welded pipe, engineers and contractors can ensure long-lasting and safe performance of critical infrastructure, making it a valuable asset in the construction and engineering fields.

In summary, S235 J0 spiral steel pipe provides unmatched quality and durability for your large diameter welded pipe needs. With their advanced manufacturing processes, superior welding quality and thorough quality inspections, our products are guaranteed to exceed your expectations. Trust Cangzhou Spiral Steel Pipe Group Co., Ltd.’s expertise and experience to meet all your steel pipe needs.