【Daily Question】2015.07.18 Types of stainless steel (2 wealth points for a reply; +3–8 wealth points if the answer is correct)
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This post was last edited by FORREST_GUMP on 2015-7-18 07:32. The Mechanical Forum has introduced the \"Question of the Day\" feature, which aims to foster an active atmosphere for technical discussions and guide the direction of such exchanges, while also providing users with financial rewards to help them experience various cool features. Fill in the blank: Alloy steel with a nominal chromium content of greater than or equal to (), which is resistant to rusting in the atmosphere, is called stainless steel ； Based on the microstructure of steel at room temperature, it can be further divided into ( ), ( ), austenitic stainless steels, martensitic stainless steels, etc. Please note: We will close this thread after 24 hours, and at that time we will announce the best reply (the best assistance), as well as the answer and explanation. Charisma Reward: Those who post a topic in this section within two days to provide a detailed explanation or discussion on the knowledge points related to this topic are asked to reply/comments in this post to inform us, and we will award extra charisma points. It is not allowed to simply copy and paste; original content is preferred, with at least some organization by the user along with personal insights and opinions. After registration, we will rank based on the content of the posts: the last-place contestant will receive +1 charm, the second-to-last +2 charm, and so on, with the highest score getting +5 charm. http://bbs.hcbbs.com/thread-1381938-1-1.html Earning wealth by inviting friends http://bbs.hcbbs.com/thread-1389240-1-1.html [Mechanical Section] Collection of essential knowledge 【Seeking manufacturer sponsorship】 (long-term campaign)
Answer: Alloy steel with a nominal chromium content of 13% or more, which is resistant to rusting in the atmosphere, is called stainless steel； Based on the microstructure of steel at room temperature, it can be further classified into (ferritic stainless steel), (duplex stainless steel), austenitic stainless steel, martensitic stainless steel, etc.
Alloy steel with a nominal chromium content of 13% or more, which is resistant to rusting in the atmosphere, is called stainless steel； Based on the microstructure of steel at room temperature, it can be further classified into (ferritic stainless steel), (duplex stainless steel), austenitic stainless steel, martensitic stainless steel, etc.
Alloy steel with a nominal chromium content of 13% or more, which is resistant to rusting in the atmosphere, is called stainless steel； Based on the microstructure of steel at room temperature, it can be further classified into (ferritic stainless steel), (duplex stainless steel), austenitic stainless steel, martensitic stainless steel, etc.
Ferritic, duplex steel with Cr content of 13% or more
13% ferrite, austenite-ferrite
1: First of all, without chromium, there is no stainless steel; without nickel, there is no high-quality stainless steel. It can be seen that chromium is the most crucial element. 2: Stainless steels such as ferritic, austenitic, and martensitic types are not classified based on their chromium and nickel content; rather, different structures are formed by adding alloying elements to iron, and it is these structures that determine their classification. Elements that form ferrite include C, N, Ni, Mn, Cu, etc., while elements that form austenite include Cr, Mo, Si, Al, Ti, Nb, etc. Different types of stainless steel are created by combining elements that form ferrite with those that form austenite. 3: Generally, the Cr content should not exceed 45%.
Answer: HG/T20581-2011 3.0.4: The nominal chromium content is greater than or equal to 13%； Based on the microstructure of steel at room temperature, it can be further divided into ferritic stainless steels, austenitic stainless steels, duplex stainless steels, martensitic stainless steels, etc.
Alloy steel with a nominal chromium content of 10.5% or more, which is resistant to rusting in the atmosphere, is called stainless steel； Based on the microstructure of steel at room temperature, it can be further divided into (ferritic stainless steel), (duplex steel), austenitic stainless steel, martensitic stainless steel, etc.
An alloy steel with a nominal chromium content of 13% or more, which is rust-resistant in the atmosphere. Based on the microstructural pattern of steel at room temperature, it can be further divided into ferritic stainless steels, austenitic stainless steels, duplex stainless steels,
The Cr content should be greater than 13%, and the types include austenitic-ferritic and ferritic stainless steels.