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Experimental study of roll forming of weld neck flanges

A roll forming situation of a weld neck flange is introduced. Through the test rolling of several flange blanks, it is concluded that the flange is challenging to roll forming. Still, it provides a solid basis for the combination of casting and rolling creating to improve the quality of the flange. The method can be used as a reference for the new process of manufacturing weld neck flanges. Flanges are widely used as pipe coupling parts. The flange is generally produced by casting molding or forging punching. Casting flange internal organization is loose and uneven, strength and quality are difficult […]

2023-03-02

Probe into the selection of thin-walled stainless steel pipes fittings and sta……

Based on the analysis of the product characteristics of stainless steel pipes, this paper comprehensively analyzes the matters needing attention in the selection of thin-walled stainless steel pipes and pipe fittings. At the same time, it deeply analyzes the domestic development prospects of thin-walled stainless steel materials and the technical problems that need to be solved in the development process. Thin-walled stainless steel pipe and stainless steel pipe fittings as one of the important products of the development of modern material science, because of its own beautiful appearance, and corrosion resistance and durability have greater advantages, belonging to the energy-saving […]

2023-02-02

Turning and Fixture Design of Flange Parts

In the manufacturing industry of electronic communication equipment, small flange parts are widely used. The traditional single-acting chuck is used for clamping and turning, which is not only inefficient, but also easy to damage the surface of parts. This paper optimizes the processing technology of flange parts by designing the lathe fixture, and improves the processing efficiency and quality of flange parts. 1. Asking questions In the field of electronic communication, small-size flange-type parts are widely used. The structure of a flange part is shown in Figure 1. The flange part is mainly composed of a square base and a […]

2023-01-28

Causes of puncture and leakage of blind flange of butane storage tank

There are 8 tanks in the butane plant of the natural gas treatment plant. The tank bottom is 5m high from the ground and of the same size, belonging to the pressure vessel. The storage medium is mixed butane (mixture of n-butane and isobutane) and isobutane (product), which was put into use in March 2008, and is a recycled pressure vessel. The tank parameters are as follows: Inner diameter of tank body: 2400mm; Tank length: 11542mm; Tank volume: 49.50m3; Design pressure: 1.58MPa; Blind flange size: DN50. In October 2008, the whole plant was shut down for internal and external inspection […]

2023-01-10

Failure Analysis and Prevention of Hastelloy C-276 Heat Exchange Tube

Hastelloy C-276 heat exchanger tube in service corrosion failure occurred, the weld area significantly thinned, the weld localized small holes. Through metallographic, scanning electron microscopy, spectral analysis and other means of analysis of the failure of the C-276 welded tube analysis. The analysis results show that only the weld was cold drawn, improper welding process and subsequent imperfect solution treatment is the main reason for the reduction in corrosion resistance of the weld area. Finally, the corresponding preventive measures were proposed. 0. Introduction Hastelloy C-276 material has good corrosion resistance, so it is widely used in chemical pressure vessels [1]. A chemical company […]

2022-12-28

Study on industrial heat treatment process of 304 stainless steel

In order to realize the bright heat treatment of 304 stainless steel evaporator, a protective atmosphere is applied to the small mesh belt heating furnace. Through the combination test of several groups of process parameters, the hydrogen flow rate is 4.5-5.0 m3/h and the pressure is 0.2 MPa; Heat treatment temperature 1060 ± 10 ℃; Holding time 6.5 min; The process parameter of mesh belt speed is 180mm/min. The influence of heating temperature and heating time on the structure and performance of evaporator was discussed. Evaporator is an important component of the four major components of refrigeration, low-temperature condensing liquid […]

2022-12-12

Design and Implementation of Heat Tracing for Chemical Pipeline

Part of the process to the temperature has related aspects of the demand, so it is necessary to use with the heat insulation to transport media, with the heat method usually using electric accompanying heating method and steam pipe accompanying heating method, and the pipeline skin effect with the heat technology is the focus of our introduction in this paper, it belongs to the electric accompanying heating method, this paper focuses on the chemical process pipeline with the heat design for detailed study. According to the characteristics of the transporting carrier, the pipeline is divided into adiabatic, non-adiabatic and heat […]

2022-12-01

A Comprehensive Guide To Plates Of Middle Thickness: Everything You Need to Kn……

What is medium thick plate? The steel plate is a flat steel which is poured with molten steel and pressed after cooling. Medium-thick plate refers to the steel plate with thickness of 4.5-25.0mm, the thickness of 25.0-100.0mm is called thick plate, and the thickness over 100.0mm is extra thick plate. Medium thickness plate generally has high comprehensive mechanical properties. Mechanical properties required are: strength, plasticity, hardness, impact toughness, stiffness, etc. Process performance requirements are: welding performance, hardenability, processability, weather resistance, corrosion resistance, wear resistance, fatigue resistance, high temperature characteristics, low temperature characteristics. corrosion resistance, wear resistance, fatigue resistance, high temperature […]

2022-11-08

Manufacturing Quality Control of U-shaped Multilayer Metal Bellows Expansion J……

According to the production and manufacturing process of hydraulic forming U-shaped multi-layer metal bellows expansion joint, the quality control methods of tube blank blanking, longitudinal seam tungsten argon arc welding, tube blank cleaning and fitting, hydraulic forming and other processes are given. Corrugated expansion joint is a very effective compensation element installed on the transport pipeline system, but it is also the weakest link in the entire pipeline system, its manufacturing quality determines the quality of operation of the entire pipeline system. u-shaped multi-layer metal bellows expansion joint manufacturing process is relatively crude, the implementation of process discipline and management […]

2022-10-03

Heat treatment of stainless steel under JIS G 4303 standard

Stainless steel is Cr content greater than 10.5%, C content of less than 1.2% of the alloy steel with high corrosion resistance. According to the steel’s room temperature organization, stainless steel is divided into five categories: austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, austenitic-ferritic stainless steel, and precipitation-hardening stainless steel. The following 5 categories of stainless steel heat treatment according to the Japanese JIS G 4303 is introduced. Heat treatment of austenitic stainless steel Solution heat treatment Solution heat treatment is the elimination of martensite in steel and steel strain, the solid solution of carbide, so that the […]

2022-09-11

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News

Experimental study of roll forming of weld neck flanges

Probe into the selection of thin-walled stainless steel pipes fittings and sta……

Turning and Fixture Design of Flange Parts

Causes of puncture and leakage of blind flange of butane storage tank

Failure Analysis and Prevention of Hastelloy C-276 Heat Exchange Tube

Study on industrial heat treatment process of 304 stainless steel

Design and Implementation of Heat Tracing for Chemical Pipeline

A Comprehensive Guide To Plates Of Middle Thickness: Everything You Need to Kn……

Manufacturing Quality Control of U-shaped Multilayer Metal Bellows Expansion J……

Heat treatment of stainless steel under JIS G 4303 standard