Technomech Engineering

SS304/SS316 Seamless Tubes

Seamless steel pipes are produced by perforating solid round steel, resulting in pipes without any welds on the surface. Based on the production method, seamless steel pipes are classified into hot-rolled, cold-rolled, cold-drawn, extruded, and jacked pipes. In terms of cross-sectional shapes, they are available in two types: round and special-shaped. Special-shaped pipes come in complex forms such as square, oval, triangular, hexagonal, melon-shaped, star-shaped, and finned pipes, with diameters ranging from 4mm to 900mm. Depending on the application, seamless pipes can be either thick-walled or thin-walled. They are widely used in applications like petroleum geological drilling, petrochemical cracking, boilers, bearings, and high-precision structural steel for automotive, tractor, and aviation industries.

1. General-purpose seamless steel pipes are rolled from ordinary carbon structural steel, low alloy structural steel or alloy structural steel. They have the largest output and are mainly used as pipes or structural parts for transporting fluids.

2. Available in three categories according to different uses:

       a. Supplied according to chemical composition and mechanical properties;

        b. Supplied according to mechanical properties;

        c. Supplied according to hydraulic pressure test. If the steel pipes supplied according to categories a and b are used to withstand liquid pressure, they must also undergo hydrostatic tests.

3. Special-purpose seamless pipes include seamless pipes for boilers, chemical and electric power, seamless steel pipes for geology, and seamless pipes for petroleum.

Due to their hollow structure, seamless steel pipes are commonly used as fluid transport pipelines for oil, natural gas, water, coal gas, and even certain solid materials. Compared to solid steel materials like round steel, seamless steel pipes are lighter while maintaining equivalent bending and torsional strength, making them an economical choice.

Seamless steel pipes are also widely employed in the manufacturing of structural and mechanical components, such as oil drill pipes, automobile drive shafts, bicycle frames, and construction scaffolding. Additionally, they are useful for producing ring-shaped parts, improving material utilization, simplifying production processes, and reducing material waste. Seamless steel pipes have become a fundamental material in manufacturing due to their versatility and efficiency.

Model and material: 4130、4140、4340、Q215、Q215、ST37、A36、45#、16Mn、SPHC、SGCC、CGCC…
Technique: Cold Rolled and Hot Rolled
Size: customized according to customer needs

Item Seamless Steel Tube
Length
3-12M or as required
Outer diameter
10mm-426mmor as customer’s requirement
Thickness
2-60mm or as customer’s requirement
Standard
AISI,ASTM,DIN,JIS,GB,JIS,SUS,EN,etc.
Technique
Hot rolled/cold rolled
Thickness tolerance
Control with in the standard, OD:+/-1%, WT:+/-5%
Material
API5L,X42,X52,X60,X70,X80,A106GR.B,A53,A179,A214,A192,A283,ST37,ST42,4130 A106-A,A179-C,A214-C,A226,A315,A106-B,A178,A210,Q195,Q235,Q275,10#,15#,20#,GSTPG38,STS38,STB30,STS42,STB42,STB35,ST33,ST37,ST35.8,ST42,ST45-8,ST52
Coatings
Standard export packing
Export packing
Waterproof paper, and steel strip packed.Standard Export Seaworthy Package.Suit for all kinds of transport,or as required
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