I received an inquiry from UAE this week. The customer requires all products to be made PWHT, let’s see what is the PWHT? Post weld heat treatment (PWHT) process refers to a welding heat treatment process in which the welds are heated to a certain te ...

The fracture inspection is one of the methods to check the quality of steel pipeline products. There are mainly the following fracture types: ductile fracture, brittle fracture, porcelain fracture, lamellar fracture, stony fracture, graphite fracture, etc. ...

As a member of steel pipeline industry,many clients asked us why the price so higher for the steel pipes,pipe fittings,flanges and other related piping products.That is because the steel prices have soared so fast recently.Let’s see the detailed reas ...

The porosity of welding seam will not only affect the compactness of welding seam, cause pipeline leakage, but also become the inducing point of pipeline corrosion, and will reduce the strength and toughness of welding seam seriously. The main factors that ...

Some time ago, the price of sand skyrocketed on the hot search.But besides sand, the price of steel, another tough material for the infrastructure industry, has also soared. According to the data, since the start of construction after the end of this year, ...

As the pipeline has been buried in the ground for a long time, with the passage of time, the characteristics of the external soil and the settlement of the terrain will affect the corrosion, leakage, site, perforation and other factors of the pipeline, res ...

I received an inquiry from a customer in Brazil as follows,”FLANGE BLIND, DN 6IN, ASME B16.5, 150LBS ASTM A105N RF, INTERNAL COATED WITH STELLITE”. About STELLITE,let’s learn about it. Stellite alloy is a kind of hard alloy that can resis ...

Today, the production of the Egyptian customer’s order has been completed and the goods have been delivered. About one month ago, I received an inquiry from an Egyptian customer. The inquiry products are mainly seamless pipes, length: 12M/PC, size: 1 ...

Hebei  Haihao Group is a professional production of flange fittings factory, we have the most complete flange equipment, at the same time we will also supply accessories together What is gasket  ? The contact surface where the gasket is inserted between th ...

The elbow is made of cast iron, stainless steel, alloy steel, malleable iron, carbon steel, non-ferrous metal and plastic. Elbow connection methods are: direct welding (the most commonly used way) flange connection, hot melt connection, electric fusion con ...

A customer needs hot rolled steel pipe this week, but only cold rolled steel pipe due to the special wall thickness.Today let’s learn about the difference between hot rolled steel pipe and cold drawn steel pipe. Cold drawn steel pipe: Cold drawn stee ...

Seamless steel pipes are everywhere in our life. The manufacturing process of seamless steel tube begins with solid round billet. Then the billet is heated to high temperature, stretched and stretched until the hollow tube is hollow. Recently, I have a Ger ...

316L stainless steel pipe is a commonly used stainless steel pipe. Because of its excellent corrosion resistance, it is widely used in the chemical industry. Its raw material 316L is a kind of stainless steel containing a chemical component – molybde ...

Hebei Haihao Group is a manufactory specialized in producing flange, pipe fittings and pipe, we can many certificates to ensure the quality. Every month there will be customers to place steel pipe orders. Today we are going to look at the areas where seaml ...

According to the different manufacturing process of steel tubes can be hot rolled, extrusion, cold drawn and cold rolled these several main types. Next, we will mainly introduce the hot rolling production process. The production process of hot rolled steel ...

Carbon steel plate usually been considered as the steel that does not contain much alloy steel elements. Generally elements are C, Mn, P, S, Si, besides these there are no minimum limits for elements of Al, Cr, Ni, Mo, V etc. Carbon steel plates are availa ...

Nondestructive testing is widely used in the field of industry. The technology does not destroy parts or materials, can be detected on site directly with high efficiency. At present, the most common non-destructive testing there are five kinds: UT (Ultras ...

Sand blasting and shot blasting are both mechanical surface cleaning processes and are often confused.Let’s see what’s the difference between and blasting and shot blasting?The main difference between them is that they have different working pr ...

The sand blasting is also a surface treatment of steel products, which is a process of cleaning and roughening the surface of the matrix by the impact of high-speed sand flow. It uses compressed air as the power to form a high-speed jet jet to spray the ma ...

Shot blasting is a surface treatment technology of steel. It uses the centrifugal force of the impeller on the head of the shot blasting machine to shoot the abrasive to the surface of the treated steel at a high linear speed to produce a striking and grin ...