stainless steel flanges

Duplex stainless steel has become an important engineering material, widely used in petrochemical industry, offshore, oil field equipment, papermaking, shipbuilding environmental protection, etc. 2507 duplex stainless steel is developed on the basis of the second generation duplex stainless steel 2205, currently has SAF2507, UR52N +, Zeron100, S32750, 00Cr25Ni7Mo4N and other grades. 2507 is composed of austenite and ferrite, and has the dual characteristics of austenitic stainless steel and ferritic stainless steel, so that it has a lower thermal expansion coefficient and higher thermal conductivity than austenitic stainless steel.  The pitting corrosion factor (PREN) is greater than 40. It is resistant to pitting corrosion, crevice corrosion and chloride stress corrosion cracking, and has high strength, high fatigue strength, low temperature and high toughness. It is a widely used material. In recent years, with the continuous expansion of the application field of  duple...

Stolt-Nielsen, the world's largest chemical tanker owner, may cancel the desulfurization plant modification project to reduce expenses as much as possible. Stolt-Nielsen has already saved up to $ 30 million in capital expenditures in its tanker division. CEO Niels Stolt-Nielsen said: "The severity and duration of the recession is clearly unpredictable, so while we look forward to the best results, we are also planning for the worst." "So far, we have found savings of approximately US $ 83 million from capital expenditures, operating, administrative and general expenses, including the board's agreement to cut board fees by 50%, and our senior management team voluntarily accepted a 20% salary reduction from 1st April. Stolt-Nilesen has not ordered any new ships at present, so its expenses mainly come from the desulfurization plant modification project. Niels Stolt-Nielsen said: "If there is an opportunity, we will cancel the desulfurization plant modif...

The minimum phase content of the  duplex pipe and fittings  also needs to reach 30%. It has the performance characteristics of both ferritic stainless steel pipe and austenitic stainless steel pipe. The so-called duplex stainless steel is that the ferrite phase and the austenite phase each account for about half of the solid solution mechanism. Duplex pipes 304 stainless steel pipes Compared with austenitic stainless steel pipe and duplex stainless steel pipe fittings have more advantages: Duplex pipe  has sufficient plasticity required for molding. The wall thickness of the storage tank or pressure vessel made of duplex stainless steel is 30% to 50% lower than the cost of using austenitic stainless steel less. Its yield strength is more than double that of austenitic stainless steel pipe factory. Especially in the environment containing chloride ion, duplex pipe has excellent resistance to stress corrosion cracking. Even duplex pipes with the lowest allo...

Stainless Steel Pipes Are Affected By The Double Effects Of Falling Prices And Rising Prices Of Major Raw Materials In 2019, due to the double impact of the downward price of stainless steel pipes and the rise in the prices of major raw materials, the steel industry will not increase profits. In early 2020, affected by the COVID19 epidemic, the prices of major stainless steel products continued to fall. The prices of the main raw materials, iron ore, were relatively strong and still fluctuated at a high level. The decline was not large, resulting in a further decline in the profit of the  stainless steel pipe  industry. According to the statistics of the China Steel Association, in 2019, the sales profit rate of key steel companies of the China Steel Association was 4.43%. From January to February 2020, due to the further decline in stainless steel pipe prices, the sales profit rate fell to 2.35%; The profit margin is only 7.4%. The profit margins of international stee...

Brief introduction of crevice corrosion test project Crevice corrosion is the phenomenon that metal surfaces form gaps due to the presence of foreign objects or structural reasons, resulting in accelerated metal corrosion in the gaps. The width of the slit or gap that causes crevice corrosion must be sufficient to allow the medium to enter and stay in it. When the crevice width is between 25 and 100 μm, it is the most sensitive range for crevice corrosion. In some wider crevices, the corrosive medium is easy flowing, crevice corrosion generally does not occur. The result of crevice corrosion will lead to a reduction in the strength of the component and a poor fit. The increase in the volume of corrosion products in the crevices will cause local additional stress, which not only makes assembly difficult, but may also reduce the bearing capacity of the component. Crevice corrosion of metals shows the following main features: (1) Whether it is the contact of the same or different...

Duplex stainless steel introduction Duplex stainless steel refers to the material whose microstructure is composed of ferrite and austenite, each of which accounts for about 50%. In actual use, one of them is more suitable between 40-60%. According to the characteristics of the two structures, through the correct control of the chemical composition and heat treatment process, the excellent toughness and weldability of austenitic stainless steel are combined with the higher strength and resistance to chloride stress corrosion of ferritic stainless steel It makes duplex stainless steel a type of steel that combines excellent corrosion resistance, high strength and easy processing and manufacturing. The physical properties of duplex stainless steel are between austenitic stainless steel and ferritic stainless steel, but are closer to ferritic stainless steel and carbon steel. The corrosion resistance and crevice corrosion resistance of duplex stainless steel pipes are related to t...

Affected By The Covid-19 Epidemic, The Situation Of Stainless Steel Flanges Is Not Optimistic 1. Global financial market turmoil, stainless steel flange futures plunged After the Chinese New Year, in the category of commodities related to economic growth, the strongest asset is the stainless steel flange. WN Flange As the overseas epidemic became more serious, Chinese finished product exports were affected. The domestic production of  stainless steel flanges  continues to pick up sharply, and the pressure of destocking is still relatively large. The oversupply of finished materials is a foregone conclusion. On the 27th, the Politburo meeting pointed out that it is necessary to speed up the issuance and use of local government special bonds, increase the fiscal deficit rate, and guide the loan market interest rate to fall, which will be beneficial to the restoration of confidence in the stainless steel flange market. However, Monday's futures still weakened signif...