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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 […]

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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 […]

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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 […]

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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 […]

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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 […]

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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 […]

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Optimization of the Forging Process for a Kind of Flange

Take a flange forging process system optimization as an example, to provide a systematic thinking approach to optimize the process, reduce costs, improve efficiency, and enhance the core competitiveness of enterprises. 1. System optimization The product is shown in Fig. 1, the material is 40Cr, the quality of forging is 2.485kg, and it is tempered. The billet Φ90mmx(58±1)mm with the mass of 2.90kg is used, and the utilization rate of the billet is 85.7%. Fig.1 Forging drawing The conventional process flow is as follows: material preparation (automatic band saw machine) – heating (medium frequency) – upsetting to remove oxidation, pre-forging […]

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What are the common forms of fatigue failure and anti-fatigue methods of beari……

A large number of application practices and life experiments have shown that bearing failure is mostly contact surface fatigue. ISO 25243-2004 lists fatigue at the top of the six common failure modes of bearings, and the fracture that is listed in sixth place is also called fatigue fracture because of fatigue in the formation process. Typical fatigue failure is divided into sub-surface origin type and surface origin type. I. Sub-surface origin type fatigue The maximum contact stress of rolling contact occurs somewhere under the surface at a certain depth, and under the repeated action of alternating stress, a fatigue source […]

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How long is the flange bolt exposed?

How long is the flange bolt exposed? Too short bolt length directly causes flange matching failure. Too long bolt length has no significance for flange connection strength. On the contrary, it is easy to cause rust, difficult cutting during disassembly and increase maintenance workload. Bolts are purchased in large quantities as common fasteners. If the length is not appropriate, the materials will be scrapped directly, and the serious ones will affect the project construction period. Therefore, the selection of bolt length needs to be paid enough attention and quantified. Standard provisions ASME B16. 5 the explanation of the bolt length […]

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Study on the head of stainless steel pressure vessel

The austenitic stainless steel head of pressure vessel will produce various defects in the process of manufacturing and use, which will affect the quality of pressure vessel and endanger the safe operation of pressure vessel. Therefore, various types of defects and causes of stainless steel pressure vessel head in the process of manufacturing and use are summarized and analyzed, and the technical measures to eliminate and repair the defects are put forward. Pressure vessel head is one of the main pressurized components of pressure vessel, and austenitic stainless steel is a high-quality material for manufacturing pressure vessel head. However, from the […]

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