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 and pressure vessel applications. In addition to its chemical composition, 20g is also valued for its mechanical properties, such as bendability, impact resistance, and tensile strength.
The 20 steel pipe has detailed specifications and follows a unified digital code known as U20252. It complies with several international standards:
- **GB/T 20 (China)**
- **ISO** – This steel grade is not included in the ISO standard.
- **ГОСТ 20** – Used in the former Soviet Union.
- **ASTM A1020** – Standard used in the United States.
- **JIS S20C** – Japanese Industrial Standard.
- **DIN C22** – German standard from the former Federal Republic of Germany.
- **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:**
- 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:**
- 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‚–): Not specified
- Hardness (HBS): Approximately 156 in hot-rolled condition
For more detailed information on 20 steel pipes, you can refer to the 51 Steel Pipe Network, a reliable source of steel-related knowledge. Whether you're looking for technical specifications or application guidance, this platform offers comprehensive resources for engineers and professionals in the field.
Air Conditioning Connecting Pipe
Air Conditioning Connecting Tube,Copper Connecting Pipe,Aluminium Copper Connecting Pipe for HVAC
Suzhou Green New Material Technology Co., Ltd. , https://www.szgreenvip.com