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Research on the defects of stainless steel pressure vessel head and handling m……

The article introduces the basic situation of stainless steel pressure vessel head, points out the main characteristics of stainless steel head defects when they occur in terms of processing technology, materials used and defective parts, and deeply analyzes the main causes and treatment methods of stainless steel pressure vessel head defects, puts forward effective strategies to prevent problems of stainless steel pressure vessel head, and puts forward some modification opinions on the existing pressure vessel technical standards in order to promote the improvement of stainless steel pressure vessel head quality and provide reference for pressure vessel manufacturing enterprises. The quality […]

2022-05-23

Test on the causes of cracking of welded steel pipe flattening test

Welded steel pipe is a steel pipe that is bent and deformed into a square or round shape by bending the steel plate or strip, and then welded. This kind of steel pipe surface are with seams, the use of billet steel or steel plate mainly. As the welded steel pipe plays a great role in the field of engineering and construction, so the community has been paying great attention to the quality control of steel pipe, and focus on the steel pipe flattening test analysis. The article will focus on the welded steel pipe flattening test cracking causes, expect […]

2022-05-15

Study of welding process of UNS NO8810 thick-walled head

This process not only solves the problem of environmental pollution from the exhaust gas of polysilicon production, but also realizes the recycling of silicon tetrachloride and other by-products, which greatly reduces the production cost. This cold hydrogenation reactor is the core equipment for the cold hydrogenation stage of the 5000 tons/year polysilicon project of a photovoltaic material company in Sichuan. The equipment has two units with vertical fixed structure, DN2000×75×18055mm, the main material is UNS NO8810, the total weight of the equipment is 71,880kg, and the whole equipment needs heat treatment after the production. Figure.1 Schematic diagram of cold hydrogenation […]

2022-05-01

Analysis of research status on forming processes and quality control of heavy ……

Large pressure vessels have been a hot spot for research because of their wide use occasions, many kinds of forming processes and high manufacturing difficulties. In addition, the key technologies of quality control in the production process of each forming technology are briefly outlined, and the causes of forming defects such as wrinkles and cracks in several typical forming processes are analyzed and some main control measures are summarized. In addition, the key technologies of quality control in the production process of each forming technology are briefly outlined, the causes of forming defects such as wrinkles, cracks, etc. in several […]

2022-05-01

Difference between duplex steel UNS S32205 and UNS S31803

Duplex stainless steels account for more than 80% of the consumption of duplex, super duplex and super duplex steels. Duplex alloys were developed in the 1930s for paper and pulp manufacturing. Duplex alloys are based on a 22% Cr composition and a mixed austenitic:ferritic microstructure that provides desirable mechanical properties. UNS S31803 and UNS S32205 are commonly referred to as 2205 stainless steels, and their two-phase names consist of an arrangement of a mixture of ferrite and austenite containing approximately equal parts. The duplex stainless steel series is typically twice as strong and offers significantly improved corrosion resistance compared to […]

2022-04-24

Annealing heat treatment process of nodular cast iron

The annealing heat treatment process of nodular cast iron includes internal stress relief annealing, high temperature annealing and low temperature annealing. The internal stress relief annealing of nodular cast iron is generally heated to 500-600 ℃ at the speed of 75 – 100 ℃ / h. according to the casting wall thickness, it can be calculated by holding for 1H every 25mm, and then air cooling. This method can eliminate 90% – 95% of the stress of the casting and improve the plasticity and toughness of the casting, but the microstructure has not changed significantly. High temperature annealing refers to […]

2022-04-14

Field management of carburizing and quenching

This article is many years engaged in carburizing quenching front-line process personnel to explain: the process, carburizing quenching common defects, to how to burn carbon accumulation, how to fix the carbon, as well as routine maintenance of the furnace and other common problems. In the actual production of heat treatment, often due to the neglect of details often lead to the emergence of defective products. Therefore, heat treatment work needs to uphold a serious and responsible attitude to minimize the chances of defective products. The actual production of heat treatment process is as follows: incoming material inspection (there is no […]

2022-04-13

Why is titanium alloy difficult to machine?

The specific strength of titanium alloy products is very high in metal structural materials. Its strength is equivalent to that of steel, but its weight is only 57% of that of steel. In addition, titanium alloy has the characteristics of small specific gravity, high thermal strength, good thermal stability and corrosion resistance, but it is difficult to cut titanium alloy materials and low machining efficiency. Therefore, how to overcome the difficulty and low efficiency of titanium alloy processing has always been a difficult problem to be solved. Reasons for difficulties in processing titanium alloys The thermal conductivity of titanium alloy […]

2022-04-11

Solution to insufficient quenching hardness

What is insufficient quenching hardness? In production, sometimes there is a lack of hardness after quenching, which is a common defect in the quenching process of heat treatment. There are two types of “hardness deficiency”, one manifestation is the whole workpiece hardness value is low, the other manifestation is local hardness is not enough or appear soft spot. When the phenomenon of insufficient hardness, to use hardness test or metallographic analysis and other methods to analyze which is “insufficient hardness”, and then from raw materials, heating process, cooling media, cooling methods and tempering temperature to find the cause, so as […]

2022-04-02

Research on flange forging technology

This article outlines the drawbacks and problems of the traditional flange forging process, and conducts an in-depth research on the process control, forming method, process implementation, forging inspection and post-forging heat treatment of flange forgings in combination with specific cases. The article proposes an optimization plan for the flange forging process and evaluates the comprehensive benefits of this plan. The article has certain reference value. 1. The disadvantages and problems of traditional flange forging process For most of the forging enterprises, the main focus in the process of flange forging is on the investment and improvement of forging equipment, while […]

2022-03-22

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News

Research on the defects of stainless steel pressure vessel head and handling m……

Test on the causes of cracking of welded steel pipe flattening test

Study of welding process of UNS NO8810 thick-walled head

Analysis of research status on forming processes and quality control of heavy ……

Difference between duplex steel UNS S32205 and UNS S31803

Annealing heat treatment process of nodular cast iron

Field management of carburizing and quenching

Why is titanium alloy difficult to machine?

Solution to insufficient quenching hardness

Research on flange forging technology