Author: parkwaypipeline

Test method and test error of Brinell and Vivtorinox hardness for stainless steel plate and other metals

Brinell test was designed by Swedish researchers in early twentieth Century. As shown in Fig. 1 (a), the test involves pressing the hardened steel ball indenter into the surface of the sample using standard load. Select the diameter / load ratio to provide impressions of acceptable diameter. The diameter of the ball can be 10,5 […]

Properties and classification of duplex stainless steel

The biphase in the name of the duplex stainless steel is mainly derived from the microstructure of the alloy. The duplex stainless steel usually contains about 50/50 austenite and delta ferrite phase mixture. Compared to austenitic stainless steel (for example, 304 or 316 stainless steel), duplex stainless steel has better corrosion resistance, especially chloride stress corrosion and […]

Factors influencing heat treatment of stainless steel plates after welding

In the heat treatment of stainless steel plates, tempering is mainly used to soften any hard microstructures that may be formed during the previous heat treatment, improve the ductility and toughness of the material. In addition, the tempering can also form precipitates, and the size of these precipitates can be controlled to provide the required mechanical […]

How to mitigate corrosion during installation of stainless steel pipes

The corrosion reaction is unavoidable during the use of stainless steel pipes, so how to alleviate the corrosion is a key aspect of maintenance process. The following article describes the methods of avoiding or alleviating corrosion of stainless steel pipes. Because stainless steel pipes are usually corroded in the circuit, corrosion prevention needs to be started […]

Attention to precipitation or aging hardening of stainless steel plates

Several methods can be used to increase the strength of stainless steel plates, which are alloying, quenching, working hardening, and a very common form of heat treatment, namely, precipitation or aging hardening. The so-called age hardening is in fact dependent on the formation of precipitates. In order to achieve the best combination of mechanical properties, the […]

Why 904L austenitic stainless steel is difficult to be processed

The grade of 904L stainless steel is 00Cr20Ni25M04.5Cu, which belongs to a high austenitic stainless steel with high carbon content and low carbon content. It has strong corrosion resistance in the dilute sulfuric acid environment, because the addition of copper makes it have strong acid resistance. It is designed for the harsh environment of corrosion. Therefore, this […]

What is the reaction of stainless steel plates and hydrogen

Hydrogen corrosion may occur in ammonia synthesis, hydrogen desulfurization and hydrogenation and petroleum refining units. Carbon steel is not suitable for high pressure hydrogen installations at temperatures above 232 C. Hydrogen can spread into the stainless steel plate and form methane at the grain boundary or in the pearlite zone with the iron carbide. Methane can not […]

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