What is the high-temperature creep temperature range?
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What is the temperature range for high-temperature creep? How are standards considered in design based on the creep failure criterion? Thank you!
The high-temperature creep temperature range is generally an elevated temperature zone below the material’s melting point, typically exceeding 0.4 times the material’s melting point. The high-temperature creep temperature ranges for different materials may vary. The temperature range in which high-temperature creep occurs is also at high temperatures, generally below the melting point of the material; the high-temperature creep temperature range may vary depending on the material. When considering design based on the creep failure criterion, it is necessary to take into account various factors such as the performance parameters of the specific material and the application environment. High-temperature creep tests are generally conducted to determine the creep behavior of materials, thereby establishing the criteria for creep failure and the design parameters. Common creep failure criteria include stable-rate creep (SSD) and maximum stress creep (MSSV), among others. .
It is generally believed that temperatures below 300 degrees Celsius do not constitute a creep damage mode. Carbon steel: RM≤414 MPa, creep threshold 343; >414 MPa, 371. 0.5Mo steel (1Cr-0.5Mo and 0.5Cr-0.5Mo): 399. Other common Cr-Mo steels: 427 degrees Celsius. Cr-Mo-V steel: 441. 9Cr-1Mo-V: 454. 12Cr: 482. 304 stainless steel: 510. 316 and 321 stainless steels: 538
The high-temperature creep conditions for Cr-Mo steel are 427–649 CSEF (N+T), 510–649 CSEF (PWHT); for austenitic stainless steels, they are 482–649 CSEF, and 510–816 CSEF
All are in accordance with the 20801 standard. Also, in high-temperature operating conditions, not only creep needs to be considered, but other types of damage mechanisms as well
Which domestic standard specifies the creep range, and which standard outlines the design method based on creep failure criteria? There is no GB150, right?
What standard is 20801? Are there specified creep temperatures for different materials? Do the GB50 and ASME standards provide design methods for creep failure?
Creep now occurs very rarely; it is mainly caused by poor quality of the raw materials and inadequate smelting processes. To avoid creep, use high-quality normalized steel as specified in GB/T 20801 for industrial pipelines.
20801 is a pipeline standard, but how should the creep failure criteria for pressure vessels be considered? How is the creep temperature range defined by that standard? Has any expert ever worked on the design of high-temperature containers? Which standard to use?
According to the creep failure criterion specified in GB150, how should the creep stress value be selected?
Creep-resistant materials must certainly be taken into consideration; what else needs to be considered within the range of materials permitted by standards? For example, how is the creep stress determined?