Tubes for Mechanical and Automobile

Seamless Steel Tubes for Mechanical and Automobile usage for Backbone of Automobile and rear axle tube, manufacturing and processing of precision equipments, instruments and apparatus.

Tubes for Mechanical and Automobile

Standard packaging is used to prevent damage to the material during shipping. If you need custom packaging for your order, please let us know what your requirements are and we will accommodate your specific needs.

Production Standard, Grade, Steel No:

Your tubular products representative will be happy to work with you to develop the information that is required. Sunny Steel supply a 1/2 million foot inventory of carbon steel pressure tubing including boiler tubes, condenser tubes and heat exchanger tubes all made in the China.

Our carbon steel pressure tubing inventory is manufactured in accordance with ASME SA-178 A and/or ASME SA-214 in diameters of 3/4″ through 4”.

Delivery Condition: GBK, BKS, BK, BKW, NBK

Inspection and Test:
Chemical Composition, Mechanical Properties, Visual and Dimension Test, NDT, Grain Size Test
Surface treatment:
Oil-dip, Varnish, Shot Blasting
Grade and Chemical Composition (%)
Grade C Mn P≤ S≤ Si Cr Mo
1010 0.08-0.13 0.30-0.60 0.04 0.05 - - -
1020 0.18-0.23 0.30-0.60 0.04 0.05 - - -
1045 0.43-0.50 0.60-0.90 0.04 0.05 - - -
4130 0.28-0.33 0.40-0.60 0.04 0.05 0.15-0.35 0.80-1.10 0.15-0.25
4140 0.38-0.43 0.75-1.00 0.04 0.05 0.15-0.35 0.80-1.10 0.15-0.25
Typical Mechanical Properties
Grade Condition Tensile strength Yield stength Elongation
Mpa(min) Mpa(min) %(min)
1020 CW 414 483 5
SR 345 448 10
A 193 331 30
N 234 379 22
1025 CW 448 517 5
SR 379 483 8
A 207 365 25
N 248 379 22
4130 SR 586 724 10
A 379 517 30
N 414 621 20
4140 SR 689 855 10
A 414 552 25
N 621 855 20
Size Range

Tubular products seamless mechanical tubing is furnished in both cold-drawn and hot finished form in a wide range of sizes, from 1.375″ to 7.750″ OD and from 0.188″ to 1.625″ wall thickness.

Minimum Quantities
Special Configurations

Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.


Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

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