Industry News

Local Corrosion Resistance of Three Common Stainless Steels

The local corrosion resistance of 1Cr18Ni9Ti, 304 and 316L austenitic stainless steels with different trace elements was studied, including intergranular corrosion, pitting corrosion and stress corrosion. The results show that the addition of Ti and lower C content can improve the intergranular corrosion resistance; the solid solution 304 stainless steel with the highest Cr and N content is the most resistant to pitting corrosion; and the solid solution 316L with the highest Ni content is the best in 42% boiling magnesium chloride solution. Austenitic stainless steels have good room temperature and low temperature toughness, weldability, corrosion resistance and heat resistance, […]

2019-05-17

Analysis of internal corrosion causes of product oil pipelines before they are……

Abstract： Corrosion failure analysis of a west-located product pipeline before putting into operation was carried out in terms of analyzing the inspection corrosion data and the pipeline conditions as well as the macro-morphology observation, microstructure examination, analysis of chemical composition and constituents of corrosion products by means of SEM, EDS and XRD. The results showed that due to the large variation of the pipeline elevation and the insufficient cleaning up of the hydrotest water, thus there existed residual water at some low points of the pipeline. Where, water-line corrosion might occur as a result of oxygen concentration difference cell formed […]

2019-05-06

What are gate valves?

What are gate valves? Gate valves are gates with opening and closing parts. The movement direction of gate is perpendicular to the direction of fluid. Gate valve can only be fully opened and closed, and can not be adjusted and throttled. Gate valves are sealed by contact between the valve seat and gate plate. Metal materials are usually overlaid on the sealing surface to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. There are rigid gate and elastic gate. According to the difference of gate, gate valves are divided into rigid gate and elastic gate. Characteristics of gate […]

2019-04-28

What is OCTG?

What is OCTG? Oil Country Tubular Goods (OCTG), is a collection of rolled metal products, more commonly known as drill pipe, casing and tubing which are manufactured according to API specification. It used both onshore and offshoreiIn petroleum industry. Oil Country Tubular Goods are used both onshore and offshore. In the industry, they are also referred to by the acronym OCTG (for “Oil Country Tubular Goods”). Drill pipe is heavy seamless tube that rotates the drill bit and circulates drilling fluid. Pipe segments 30 ft (9m) long are coupled with tool joints. Drill pipe is simultaneously subjected to high torque […]

2019-04-06

Ferritic stainless steel forging & austenitic stainless steel forging

Basic knowledge of ferritic stainless steel forging Characteristics of ferritic stainless steel forging Types of Ferritic Stainless Steel Chemcial Composition of Ferritic Stainless Steel Mechanical Properties of Ferritic Stainless Steel Physical Properties of Ferritic Stainless Steel Applications of Ferritic Stainless Steel Austenitic stainless steel Characteristics of austenitic stainless steel forging Applications of austenitic stainless steel Pure chromium ferritic stainless steel has no significant increase in hardness after quenching. During the forging process, work hardening will occur and the hardening degree varies with temperature and shape variables. This kind of steel has no rigorous requirement for the cooling temperature after forging. […]

2019-03-07

Five Technical Requirements for Flange Forging Process

The use conditions of flanges refer to the importance, working conditions, assembly and disassembly difficulty, complexity of them, as well as force, working temperature, corrosion degree, and other factors. From the basic principle that the forging is to serve and meet the use conditions of the parts, the technical requirements of the forging should include two aspects, one is the requirements of the shape, size and surface of the forgings, and the other is the requirements of structure and mechanical performance. The key to meeting the requirements of forgings is correctly selecting the raw materials, and strictly controlling the production […]

2019-02-12

What is an elbow?

What is an elbow? The steel elbow is a kind of connecting pipe commonly used in pipe installation. It connects two pipes with the same or different nominal diameters to make the pipe turn at a certain angle. According to the angle, there are three most commonly used 45° and 90°180°, and other abnormal angle elbows such as 60° are also included according to engineering needs . A bending radius of less than or equal to 1.5 times the diameter of the pipe belongs to the elbow, and 1.5 times larger than the pipe diameter belongs to theelbow . Elbows are made of cast iron, stainless steel, alloy steel, malleable […]

2019-01-22

Sealing form of forged valve and its sealing performance

Seals will also be a vital component in forged valves. The sealing performance of the forged valve means ability of the sealing parts of the cast valve to stop the leakage in the medium. It is an essential technical performance index in the forged valve. You can find three sealing elements of the cast valve: This is the contact between your sealing surfaces with the frequent lowering and raising member as well as the valve seat the joint with the packing together with the valve stem along with the stuffing box the text between your forged valve body and the […]

2018-12-30

Pressure test method and precautions for valves

In chemical production, as long as there is fluid, the valve will be used. The importance of the valve in the chemical industry is self-evident. So today, Yikong Jun will discuss with you the pressure test methods and precautions for common valves. Commonly used media for valve pressure test are water, oil, air, steam, nitrogen, etc. The pressure test methods for various industrial valves with pneumatic valves are as follows: 1 Shut-off valve and throttle valve For the strength test of the stop valve and the throttle valve, usually put the assembled valve in the pressure test frame, open the […]

2018-12-30

Experimental study on corrosion of ductile iron water supply pipe

The tap water corrosion of ductile cast iron for water-supply pipe (DCIWP) is studied by means of electrochemical method and mass loss method. Taking into account the effects of initial corrosion on the correctness of the experimental results, a mass loss test including a period of pre-corrosion is conducted to study the main influence factors for the corrosion process through the orthogonal test design. The result turns out that at first the corrosion rate of the iron fluctuates significantly, then declines gradually over time and becomes stable in 48 h finally. The influence of pH of the water and test […]

2018-12-16

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Local Corrosion Resistance of Three Common Stainless Steels

Analysis of internal corrosion causes of product oil pipelines before they are……

What are gate valves?

What is OCTG?

Ferritic stainless steel forging & austenitic stainless steel forging

Five Technical Requirements for Flange Forging Process

What is an elbow?

Sealing form of forged valve and its sealing performance

Pressure test method and precautions for valves

Experimental study on corrosion of ductile iron water supply pipe