Weld steel pipes

Sunny Steel produce an extensive selection of welded steel pipe including Electronic Resistance Welded (ERW), Electronic Fusion Welded (EFW), and Double Submerged Arc Welded (DSAW) carbon steel pipe along with their respective flanges and fittings.

Anti-corrosion steel pipe

Special Welded Tubes

Special Welded Tubes

We can produce precision and high-frequency welded steel tubes and pipes with all possible dimensions and shapes available.

Hot-dip galvanizing pipe

Galvanized Steel Pipe

Hot-dip galvanizing (HDG), as referenced is the process of dipping fabricated steel into a kettle or vat of molten zinc.

LSAW pipe

Recommended Weld steel pipes and tubes

Square hollow section

Square steel tube comes in different sizes, specifications and wall thicknesses.

Rectangular Hollow Sections

Rectangular steel tube comes in different sizes, specifications and wall thicknesses.

Oval pipe

For the best quality Oval Tubes, we serve as one-stop destination in the international market.

Pipe cement mortar lining

Cement mortar lining can ensure a safe and abundant water supply for your water customers for many years to come.

2PP/3PP Anti-corrosion pipe

Three-layer PE/PP coating is characterized by excellent corrosion-proof performance,insulatibity,relatively long service life and mechanical damage resistance.

3PE steel pipe, 2PE Steel pipe

3PE steel pipe, 2PE Steel pipe Resistant to chemical corrosion, resistance to cathodic disbondment resistance, mechanical damage to properties.

Key Specifications/Special Features of Welded Pipes and tubes

ERW PIPES

Dimensional tolerance of erw steel pipe

ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc.

Galvanized pipe VS. Seamless pipe

Galvanized pipe is protected by zinc, so it is not easy to rust, galvanized steel pipe is lighter than seamless steel pipe

Anti-corrosion pipe Layer Structure

Anti-corrosion steel pipe is processed through the preservation process, which can effectively prevent or slow down the process

Welded Tube and Pipe Manufacturing Processes

Steel strip in coil, which has been slit into the required width from wide strip, is shaped by a series of forming rolls into a multiple length shell.

Which difference betweem astm a53 and astm a106

The difference between ASTM A53 pipe vs A106 Pipe in spec scope, pipe chemical composition, mechanical properties (tensile & yield strength etc), pipe type.

Electric resistance welding at a glance

This article provides an overview of electric resistance welding (ERW). It dicusses high-frequency ERW (contact and induction) and rotary wheel contact welding (AC, DC, and square wave). It describes the differences among the processes, as well as the power supplies and weld rolls.

EFW pipe vs ERW pipe

Electric Fusion Welding(EFW steel pipe) refers to an electron beam welding, the use of high-speed movement of the electron beam directed impact kinetic energy is converted to heat the workpiece so that the workpiece leaving the melt, the formation of the weld.


Disadvantage and defect of resistance welding

Resistance welding is pressed welders parts between the two electrodes, and go through to the current use of resistance heat generated…


ERW pipe technical requirements

ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc.


The Purpose Guidance Of Welded Steel Pipe

Generally speaking, the welded steel pipes are divided into general welded pipe, galvanized welded pipe, oxygen welding tube, metric system welded tube, transformer tube, welding thin wall pipe and spiral welded pipe etc.


Identification of fake spiral steel pipe

We can produce precision and high-frequency welded steel tubes and pipes with all possible dimensions and shapes available.


Which difference betweem astm a53 and astm a106

The difference between ASTM A53 pipe vs A106 Pipe in spec scope, pipe chemical composition, mechanical properties (tensile & yield strength etc), pipe type.


Galvanized pipe process characteristics

Available Specification

Anti-corrosion steel pipe is processed through the preservation process, which can effectively prevent or slow down the process in the transport and use of chemical or electrochemical corrosion reaction of steel pipe.

API SPEC 5CT
Product Name
Executive Standard
Dimension (mm)
Steel Code / Steel Grade
Casting
API 5CT
48.3~273 x 2.77~11.43
J55, K55, N80, L80
Tubing
API 5CT
48.3~273 x 2.77~11.43

J55, K55, N80, L80, H40

API SPEC 5L
Product Name
Executive Standard
Dimension (mm)
Steel Code / Steel Grade
Line Pipes
API 5L
60.3~273.1 x 2.77~12.7
A25, A, B, X42, X46, X52, X56, X60, X65
ASTM / ASME
Product Name
Executive Standard
Dimension (mm)
Steel Code / Steel Grade
Electric-Resistance-welded Steel Pipes
ASTM A135
42.2~114.3 x 2.11~2.63
A
ERW and Hot-dip galvanized Steel Pipes
ASTM A53
21.3~273 x 2.11~12.7

A, B

Pipes for Piling Usage
ASTM A252
219.1~508 x 3.6~12.7
Gr2, Gr3
Tubes for General Structural Purpose
ASTM A500
21.3~273 x 2.11~12.7
Carbon Steel
Square Pipes for General Structural Purpose
ASTM A500
25 x 25~160 x 160 x 1.2~8.0
Carbon Steel
DIN
Product Name
Executive Standard
Dimension (mm)
Steel Code / Steel Grade
Threaded Steel Pipes
DIN 2440
21~164 x 2.65~4.85
Carbon Steel
BS
Product Name
Executive Standard
Dimension (mm)
Steel Code / Steel Grade
Screwed and Socketed Steel Tubes
BS 1387
21.4~113.9 x 2~3.6
Carbon Steel
EN
Product Name
Executive Standard
Dimension (mm)
Steel Code / Steel Grade
Scaffolding Pipes
EN 39
48.3 x 3.2~4
Carbon Steel
JIS
Product Name
Executive Standard
Dimension (mm)
Steel Code / Steel Grade
Carbon Steel Tubes for General Structure Purpose
JIS G3444
21.7~216.3 x 2.0~6.0
Carbon Steel
Carbon Steel Tubes for Machine Structure Purpose
JIS G3445
15~76 x 0.7~3.0

STKM11A, STKM13A

Carbon Steel Pipes for Ordinary Piping
JIS G3452
21.9~216.3 x 2.8~5.8
Garbon Steel
Carbon Steel Pipes for Pressure Service
JIS G3454
21.7~216.3 x 2.8~7.1
Carbon Steel
Carbon Steel Rigid Steel Conduits
JIS G8305
21~113.4 x 1.2~3.5
G16~G104, C19~C75, E19~E75
Carbon Steel Rectangular Pipes for General Structure
JIS G3466
16 x 16~150 x 150 x 0.7~6
Carbon Steel