Recently,a French customer asked us to participate in the bidding project with her company.After careful study of the bidding requirements,it is found that the owners have high requirements for weldin...

Seamless elbow is manufactured by the seamless steel pipe,through hot push,punching or extruding processes,no seam on the elbow body.The common used manufacturing technology of seamless elbow includes...

What is sandblasting?
Abrasive blasting,more commonly known as sandblasting,is the operation of forcibly propelling a stream of abrasive material against a surface under high pressure to smooth a roug...

Radiographic testing(RT),refers to the use of X-ray or gamma-ray penetrating specimens,film as the recording of information equipment nondestructive testing methods,this method is the most basic,the m...

Today,our factory conducted hydrostatic tests on large diameter bends according to the requirements of customers in Kuwait.
This test is one of the common methods to judge the reliability of water pip...

Dye penetrant inspection(DPI) result judgment and record:

Determine the size and severity of the defect based on the size of the displayed trace and the shade of the color.
The defect shows that the ...

Penetrant testing(PT),also called dye penetrant inspection(DPI) or liquid penetrant inspection(LPI),is one of the most common,low cost solution,oldest methods of nondestructive testing.
Principles of ...

Magnetic particle inspection(MPI),also called magnetic particle testing(MT),works by magnetizing the specimen using a magnet or by producing a magnetic field by inducing an electric current in the spe...

Magnetic particle testing (MT),also referred to as magnetic particle inspection(MPI),is a nondestructive testing (NDT) technique used to detect surface and slightly subsurface flaws in most ferromagne...

Ultrasonic testing is an nondestructive testing(NDT) technology for detecting test piece discontinuities which may not be visible to the human eye.These defects can include cracks,corrosion,inclusions...

Yesterday,a customer from England asked me that whether our factory produce stainless steel elbow?The answer is obvious-yes,we do produce stainless steel elbow.Compared with carbon steel elbow,stainle...

Anti-corrosive coated steel pipe means the pipe has conducted anti-corrosive processing,which can effectively prevent or slow the corrosion phenomena of steel pipes in the course of transportation,che...

Large-caliber elbow generally refers to the elbow with a diameter above DN600,large-caliber elbow includes bevel straight seam elbow and large-caliber seamless butt welding elbow.
The automatic weldin...

A few days ago,a customer asked me about how to distinguish butt welding ring lap joint flange and slip on ring lap joint flange.He wanted to order some products for his construction project.I sent sa...

Reducing flange is a special flange used to connect two different diameters pipes in a piping system,commonly it is joint together with regular standard flange.It’s inside diameter is different ...

Recently,a customer contacted Haihao Group and expressed his satisfaction about our pipe fittings with anti-corrosion coating that he had ordered several months ago.He said these products can endure e...

Hebei Haihao Group is Chinese leading steel flange,pipe fittings & steel pipe manufacturer with over 35 years experience.We will attend NEFTEGAZ 2019.
Exhibition venue:Expocentre exhibition venue,...

We received an order about lap joint stub end.The customer order is as follows: 3″ Sch 40  Grade 316  stub end type B dimensions to ASTM A403.The specification is stub end type B.
Types of MSS S...