**304 Sanitary Grade Stainless Steel Pipe Knowledge**
**Understanding 304 Stainless Steel Pipes**
In China, stainless steel plates and strips are standardized under GB4237-84 (hot rolled stainless steel plate - Grade I) and GB4239-91 (cold rolled stainless steel strip - Grade I). These standards define the quality and properties of stainless steel used in various industrial applications.
**Identification Methods for Stainless Steel**
Stainless steel is typically identified using a combination of chemical elements and numbering systems. Here’s how different countries classify their stainless steels:
1. **Chemical Element Marking**:
Some countries use letters to represent specific elements. For example:
- China and Russia often use designations like **12CrNi3A**, where "Cr" stands for chromium and "Ni" for nickel.
- In some cases, the national standard is combined with the foreign designation.
2. **Numerical Series Identification**:
Countries like the USA and Japan use series numbers to classify stainless steels. For example:
- **300 series** refers to austenitic stainless steels.
- **400 series** includes ferritic and martensitic types.
- **200 series** are also austenitic but with lower nickel content.
3. **Latin Alphabet and Specific Notation**:
Some systems combine Latin letters with numerical codes to indicate special properties or grades.
**National Numbering Rules**
Different countries have their own rules for marking stainless steel. In China, for instance:
- **P** = Plain carbon steel
- **F** = Boiling steel
- **B** = Killed steel
- **AT8** = Special type of steel
- **Hanyu Pinyin** is used for certain alloys.
Examples:
- **GCr15** – A high-chromium bearing steel
- **20CrMnTi** – A low-alloy structural steel
- **60SiMn** – A spring steel with silicon and manganese content
**Carbon Content Indication**
In many cases, the carbon content is indicated as a fraction of a percentage:
- **1Cr18Ni9** – Contains approximately 0.1% carbon (i.e., 1/1000)
- **0Cr18Ni9** – Ultra-low carbon (C ≤ 0.08%)
- **00Cr17Ni13Mo** – Very low carbon (C ≤ 0.03%)
**Foreign Stainless Steel Marking Systems**
The American Iron and Steel Institute (AISI) uses a three-digit system:
- **200 and 300 series** – Austenitic stainless steels (e.g., 201, 304, 316, 310)
- **400 series** – Ferritic and martensitic stainless steels (e.g., 430, 440C)
- **Precipitation-hardened stainless steels** and iron alloys with less than 50% iron are usually trademarked or patented.
**Summary**
Understanding the marking systems of stainless steel is essential for selecting the right material for specific applications. Whether it's 304 sanitary grade pipes or other types of stainless steel, proper identification ensures the correct performance and durability in various environments.
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