Pipe Processing Workshop Indonesia

Manufacturing process

Welding:

The craftsmanship of a product determines its advantages and disadvantages. Generally, welded steel pipes have high precision, uniform wall thickness, high brightness inside and outside the pipe (the surface brightness of the steel pipe is determined by the surface grade of the steel plate), and can be of any size. Therefore, its economy and aesthetics are reflected in high-precision, medium and low-pressure fluid applications.

Welding characteristics:

According to the welding process, it can be divided into automatic welding and manual welding. Automatic welding generally uses submerged arc welding and plasma welding, while manual welding generally uses argon arc welding.

Classification:

According to the welding seam form, it is divided into straight seam welded pipe and spiral welded pipe.

Matte finish:

At normal temperature or when the electrolyte is heated to 40-50 degrees, hang the lead plate or stainless steel plate on the cathode, fix the workpiece to be electrolytically polished on the anode, and then adjust the voltage to about 5 volts, and wait for electrolytic polishing. Then remove the workpiece. Polish for 3-5 minutes. Complete extinction electrolysis technology.

Process flow:

Chemical degreasing and rust removal → water washing → electrolytic matting → water washing → neutralization → water washing → hot pure water washing

Seamless pipe manufacturing process:

1. Hot rolling (extruded seamless steel pipe): round tube billet → heating → perforation → three-roller cross-rolling, continuous rolling or extrusion → tube removal → sizing (or reducing diameter) → cooling → straightening → hydraulic test (Or flaw detection) → mark → storage

The raw material for rolling the seamless tube is a round tube blank. The round tube blank is cut by a cutting machine into a blank with a length of about 1 meter, and is sent to the furnace for heating through a conveyor belt. The billet is fed into the furnace for heating at a temperature of approximately 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature control in the furnace is a key issue. After the round tube billet is released, it needs to pass through the pressure piercing machine. The most common perforation machine is a tapered roller perforation machine. This kind of perforation machine has high production efficiency, good product quality, large perforation diameter and can wear a variety of steel types. After the piercing, the round tube blank is successively rolled, rolled or squeezed by three rolls. After squeezing, the tube should be calibrated. The sizing machine rotates into the steel embryo through the conical drill at high speed to form holes. The inner diameter of the steel pipe is determined by the outer diameter length of the drill bit of the sizing machine. After sizing the steel pipe, it enters the cooling tower and is cooled by water spray. After cooling, the steel pipe will be straightened. After straightening, the steel pipe is sent to the metal flaw detector (or hydraulic test) by the conveyor belt for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, it will be detected. After the quality inspection of the steel pipes, strict manual selection is required. After the quality inspection of the steel pipes, spray paint with numbers, specifications, production batch numbers, etc. And lifted into the warehouse by crane.

2. Cold drawn (rolled) seamless steel tube: round tube billet → heating → perforation → heading → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → billet → heat treatment → straightening →Hydraulic test (flaw detection)→Marking→Storage.

The rolling method of cold drawn (rolled) seamless steel pipe is more complicated than hot rolled (extruded seamless steel pipe). The first three steps of their production process are basically the same. The difference starts from the fourth step. After the round tube blank is hollowed, it needs to be headed and annealed. After annealing, pick up with a special acidic liquid. After pickling, apply oil. Then it is followed by multi-pass cold drawing (cold rolling) and then billet tube, special heat treatment. After heat treatment, it will be straightened.

Grades

Check out our various grades of alloy products.

Check out our various grades of stainless steel.