エントリー - WLDステンレス

304 Stainless Steel VS 321 Stainless Steel

2月 23, 2018 カテゴリ: /作成者:

Both grade 304 and 321 belong to the Austenitic 300 series stainless steel. They are similar in corrosion resistance, strength, hardness and welding performance, but 321 is mostly used in the heat resistance condition of 500-600 ℃. 321H stainless steel is the low-carbon version of 321, is the commonly used heat resistant steel, of which carbon content is slightly higher than 321 grades. 304 steel is an alternative to 321 stainless steel where intergranular corrosion resistance rather than high temperature strength is required. In a way, grade 321 stainless steel is a new version based on grade 304 by adding Ti to improve the corrosion resistance of grain boundary and […]

Why the stainless steel pipe need solution annealing?

8月 19, 2017 カテゴリ: /作成者:

Solution annealing is also referred as carbide solution annealing, is a process that heats the work part to 1010℃ or above to remove of carbide precipitation (Carbon from the stainless steel solid solution), and then it is rapid cooling, usually, water quenching and the carbide returned to the stainless steel solid solution. Solution annealing treatment can be applied to alloy steel and stainless steel. For 304 stainless steel castings, solution treatment can produce uniform microstructure without carbide impurities. Generally, the stainless steel tube is heated to about 950 ~ 1150℃ for a long time to make the carbide and various alloying elements fully and evenly dissolved in Austenite, and then […]

Why does stainless steel corrode?

3月 1, 2016 カテゴリ: /作成者:

As we all know, stainless steel has the ability to resist atmospheric oxidation, that is, will not rust, but also corrode in the medium like acid, alkali and salt, that is, corrosion resistance. However, the corrosion resistance of stainless steel is conditional, that is, stainless steel in a certain medium is corrosion-resistant, but in another medium may be destroyed. Correspondingly, no one of stainless steel is resistant to corrosion in all environments. Stainless steel can provide excellent corrosion resistance in various industries, strictly speaking, they show excellent corrosion resistance in most media, but it is exceptional in some media due to low chemical stability and corrosion but. Therefore, stainless steel […]