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Dual grade stainless steel 304 /304L, 316/316L

5月 13, 2021 カテゴリ: /作成者:

Austenitic stainless steels are the most widely used stainless steels, accounting for about 75% of the total stainless steel consumption. The rapid development of the chemical industry and petrochemical industry has put forward higher requirements for the corrosion resistance and strength of stainless steel. For example, the 304/304L dual grades stainless steel means it has lower carbon content, that’s less than 0.03%, meeting the 304L grades, while its yield and tensile strength are higher than the lower limit of 304 stainless steel, the stainless steel can be defined as 304/304L dual grades stainless steel, that is, its chemical composition meets that of 304L, and mechanical properties to meet the requirements […]

What’s Super 304H steel?

5月 7, 2021 カテゴリ: /作成者:

With the development of ultra-supercritical units, the high-temperature strength of traditional 18-8 Austenitic stainless steels (such as TP304H steel) has been unable to meet their needs with steam parameters of 600℃. For this reason, Japan Sumitomo Metal Corporation has developed new materials for the boiler heating surface pipeline of the unit, like TP347HFG steel, SUPER304H steel and HR3C steel. Super 304H steel is a new type of 18-8 steel, mainly used in the manufacture of superheater and reheater of ultra-supercritical boilers whose metal wall temperature does not exceed 700 ℃. At present, Shasqida Mannesmann (formerly DMV Company) in Germany also produces similar steel tubes, with a grade DMV 304HCU. Super304H […]

Is 304 stainless steel magnetic?

4月 22, 2021 カテゴリ: /作成者:

Ordinary consumers have some misunderstandings about stainless steel, they think that the magnetic stainless steel is not qualified 304 stainless steel. As we know, according to the structure under room temperature，stainless steel can be divided into Austenite such as 201, 304, 321, 316, 310, Martensite or Ferric such as 430, 420, 410. Austenites are non-magnetic or weakly magnetic and Martensite or ferrite are magnetic. 304 is a representative grade of the austenitic stainless steel, it has excellent workability, weldability and corrosion resistance, account for 60% of the world consumption of stainless steel, generally, it is no magnetic, but sometimes it is magnetic or weak magnetism caused by smelting chemical composition […]

When Stainless steel bellows used in shell heat exchanger

4月 13, 2021 カテゴリ: /作成者:

The bellows tube heat exchanger is an upgrade based on a straight (bright) tube heat exchanger. The design of the crest and trough of the wave inherits the advantages of the tubular heat exchanger such as durability and safety, and at the same time overcomes the defects such as poor heat transfer capacity and easy scaling. The principle is to improve the total heat transfer coefficient so as to reduce the required heat transfer area, which can save materials and reduce weight under the same heat transfer effect. Because the bellows body is processed by cold pressing of bright pipe billet, it is generally believed that the bellows body can be […]

304 stainless steel VS 403 stainless steel

4月 9, 2021 カテゴリ: /作成者:

Grades 304 and 430 are commonly used stainless steel materials. 304 stainless steel is a general type of chromium-nickel austenitic stainless steel, the density of 7.93 g/cm3, also known as 18/8 stainless steel, is 300 series of stainless steel is the most commonly used steel. It can withstand high temperature 800℃, has good processing performance and toughness, widely used in the requirements of good comprehensive performance (corrosion resistance and molding) equipment and parts. 304L is a low-carbon version of 304, which does not require post-weld annealing, so it is widely used for thick gauge parts (approx. 5mm and above). The higher carbon content of 304H can be used at high […]

How the Nitrogen affect 316LN stainless steel?

4月 6, 2021 カテゴリ: /作成者:

316LN is the Nitrogen addition version based on 316L steel (0.06% ~ 0.08%), so that it has the same characteristics as 316L,  has been used in the manufacture of high-temperature structural components in fast breeder reactor (FBRS). Reducing the carbon content greatly reduces the susceptibility to stress corrosion cracking due to welding in subsequent corrosive environments. The creep, low cycle fatigue and creep-fatigue interaction are the most important considerations for FBRS components. The high-temperature strength of 316L stainless steel can be improved to 316 stainless steel by alloying 0.06% ~ 0.08% N. The influence of nitrogen content higher than 0.08% on mechanical properties of 316L stainless steel at high temperature […]