There are two types of steel commonly referred to as "20": 20 steel and 20g. While both have similar carbon content, 20g contains additional trace elements that make it more suitable for use in boiler pressure vessels. In addition, 20g is specifically designed with improved physical properties such as better bending, impact resistance, and tensile strength, making it ideal for high-stress applications.
The detailed specifications and standards for 20 steel pipe are unified under the digital code U20252. It is recognized by various international standards:
- **GB/T 20 (China)**
- **ISO** – This steel code is not included in the ISO standard.
- **GOST 20** – Former Soviet Union standard.
- **ASTM A1020** – United States standard.
- **JIS S20C** – Japanese standard.
- **DIN C22** – Former West Germany standard.
- **BS 1C22** – British standard.
- **NF C22** – French standard.
Note: Some domestic steel grades may not have an equivalent ISO code.
Chemical composition of 20 steel includes:
- Carbon (C): 0.17–0.24%
- Silicon (Si): 0.17–0.37%
- Manganese (Mn): 0.35–0.65%
- Phosphorus (P): ≤ 0.040%
- Sulfur (S): ≤ 0.040%
Mechanical properties include:
- Yield strength (σₛ): Not less than 250 MPa
- Tensile strength (σᵇ): Not less than 420 MPa
- Elongation (δ): Not less than 25%
- Section reduction (ψ): Not less than 55%
- Impact toughness (aâ‚–): Measured value depends on testing conditions
- Hardness (HBS): Approximately 156 in hot-rolled condition
This information is sourced from 51 Steel Pipe Network, a reliable platform for steel pipe data and technical details. Whether you're looking for material specifications or application guidance, this resource provides comprehensive insights into different steel grades and their uses.
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