GB/T 30584 20Mn2 Precision Hot Rolled Seamless Alloy Steel Pipe For Crane Jib
Table of Contents
- Introduction
- Material
- Specification
- Key Features
- Chemical Composition
- Mechanical Properties
- Steel Grade
- Application
- Possible Alternative Grades
1. Introduction
The GB/T 30584 standard specifies the requirements for 20Mn2 precision hot rolled seamless alloy steel pipe used for crane jibs. This article provides detailed information on the material, specifications, key features, chemical composition, mechanical properties, steel grade, application, and possible alternative grades.
2. Material
20Mn2 is a type of alloy steel that is commonly used in the manufacturing of seamless pipes. It offers superior strength and toughness while maintaining excellent weldability. The material is known for its high tensile strength, ductility, and resistance to wear and abrasion.
3. Specification
The GB/T 30584 standard outlines the specifications for 20Mn2 precision hot rolled seamless alloy steel pipes used specifically for crane jibs. The standard defines various parameters such as pipe dimensions, tolerances, surface finish, and testing requirements to ensure the quality and reliability of the pipes in crane applications.
4. Key Features
The 20Mn2 precision hot rolled seamless alloy steel pipe possesses several key features that make it ideal for crane jibs:
- High strength and toughness
- Excellent weldability
- Resistance to wear and abrasion
- Good machinability
- Superior structural integrity
5. Chemical Composition
The chemical composition of 20Mn2 alloy steel is as follows:
| Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) |
| Composition | 0.17-0.23% | 0.17-0.37% | 1.40-1.80% | 0.035% max | 0.035% max |
6. Mechanical Properties
The mechanical properties of 20Mn2 alloy steel are:
| Property | Value |
| Tensile Strength | 690-785 MPa |
| Yield Strength | 450 MPa min |
| Elongation | 15% min |
| Impact Toughness | 55J min (at -20°C) |
| Hardness | 170-217 HB |
7. Steel Grade
20Mn2 is a steel grade that falls under the GB/T 30584 standard. It is a low carbon alloy steel known for its high strength and toughness properties. The steel grade ensures the pipe's structural stability and reliability in crane jib applications.
8. Application
The 20Mn2 precision hot rolled seamless alloy steel pipe is primarily used for crane jibs in various engineering and construction projects. Its high strength, resistance to wear and abrasion, and excellent weldability make it suitable for withstanding heavy loads and extreme working conditions.
9. Possible Alternative Grades
Although 20Mn2 is a commonly used alloy steel grade for crane jib applications, several alternative grades can also be considered based on specific requirements. Some possible alternative grades include:
- 16Mn
- 42CrMo
- 35CrMo
- 15CrMo
- 20CrMo
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