What is sa213 t91 mechanical properties
Jan 07, 2026
ASTM A213 T91 high-pressure alloy seamless steel pipes are made of modified 9Cr-1Mo-V-Nb-Ti martensitic heat-resistant steel. Through optimized alloy proportions, a creep rupture strength of ≥140MPa is achieved after 100,000 hours. This material, with the addition of trace elements such as vanadium and niobium, maintains excellent creep resistance even at high temperatures of 580℃-650℃, making it a core material for critical equipment in thermal power, nuclear power, and other fields.
A213 T11 and T22 Mechanical Properties Comparison Table
| Performance Indicator | Standard Value | Performance Advantage |
|---|---|---|
| Yield Strength (Rp0.2) | ≥415 MPa | Ensures structural stability under high-pressure conditions |
| Tensile Strength (Rm) | 585-760 MPa | Outstanding ability to withstand sudden loads |
| Elongation (A5) | ≥20% | Excellent plastic deformation capability |
| Impact Energy (KV2) | ≥41 J | Superior resistance to brittle fracture |
| Hardness (HB) | ≤250 HB / 25 HRC | Balanced wear resistance and machinability |
Processing Properties (Machining and Welding Characteristics)
Formability: Seamless steel pipes are formed by hot rolling or cold drawing. Due to their good plasticity at room temperature, they can be processed into thin-walled (≥2mm) or thick-walled (≤100mm) pipes to meet different pressure rating requirements.
Weldability: Matching welding wire (e.g., ER90S-B9) and flux are required. Preheating (200~300°C) is necessary before welding, followed by high-temperature tempering (760~780°C) after welding to avoid welding cracks (due to the high Cr content, there is a slightly greater tendency for hardening).
Heat Treatment Sensitivity: Normalizing and tempering temperatures must be strictly controlled. Insufficient tempering will leave residual martensite, leading to brittleness; excessive tempering will reduce strength. Processing is necessary to ensure uniform performance.
Applications of A213T91 Alloy Steel Pipe
Due to its excellent performance and wide range of applications, A213T91 alloy steel pipe is widely used in the following fields:
1. Power Plant Construction: A213T91 alloy steel pipe is an ideal choice for power plant boilers, especially suitable for high-temperature, high-pressure, and highly corrosive environments. It can improve the safety and stability of boilers and extend their service life.
2. Petrochemical Industry: In the petrochemical industry, A213T91 alloy steel pipe is widely used in the manufacture of heating furnaces, reactors, pipelines, and other equipment due to its good corrosion resistance and high-temperature resistance.
3. Energy Sector: In addition to the power and petrochemical industries, A213T91 alloy steel pipe is also widely used in the energy sector. For example, in coal chemical, nuclear energy, and solar energy fields, A213T91 alloy steel pipe is favored for its excellent performance.
4. Other Fields: Besides the above applications, A213T91 alloy steel pipe is also widely used in shipbuilding, aerospace, metallurgy, and other fields. Its superior performance and wide range of applications make it an important engineering material.
A213 T92 Heat resistant pipe factory
