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Boiler Steel For Room Temperature and High Temperature Pressure Parts

According to different working conditions, boiler steel plates can be divided into two categories: steel plates for room temperature and medium temperature pressure parts and steel plates for high temperature pressure parts.
Boiler steel plates at room temperature and medium temperature (below creep temperature) are mostly made of carbon steel, including carbon steel, carbon-manganese steel, carbon-manganese-silicon steel, etc., ie Q245R in GB/T713-2014 Steel for boilers and pressure vessels. Q345R (20g, 22Mng, 16Mng, 19Mng steel in GB/T713-1997 Boiler Steel Sheet). ASME SA-515/SA-515M Carbon Steel Sheet for Medium and High Temperature Pressure Vessels, SA-299/SA- 299M Carbon Manganese Silicon Steel Sheet for Pressure Vessels etc. Boiler steel plate is mainly used for the manufacture of boiler drums, pressure-receiving parts such as tank end caps below medium temperature.

Room temperature and medium temperature boiler steels are required to have

Higher room temperature strength;
Good impact toughness and low notch sensitivity;
Since the components such as the drum require a large amount of cold deformation during processing, it is also required to have good ageing toughness;
Good processing and welding performance;
Good low-power organization, etc.
High temperature (above creep temperature) For boiler steel plates, low alloy heat resistant steel is generally used, and chromium chromium molybdenum steel, chromium molybdenum vanadium steel, chromium molybdenum tungsten steel, etc. are commonly used. It is mainly used to manufacture high temperature pressure-bearing parts such as high temperature header end caps and steam pipe blocking plates.
For example, GB125-2014 boiler steel plate 15CrMoR, 12Cr1MoVR and US ASME SA-387/SA387 M chromium-molybdenum alloy steel plate for pressure vessel Gr22, Gr91 and ASME SA1017/SA1017M pressure vessel for chromium-molybdenum-tungsten alloy steel plate Gr23, Gr911, Gr122 steel, etc.

High Temperature Boiler Steel Plates Are Required To Have:

Adequate high temperature durability and long-lasting plasticity;
Good high temperature tissue stability;
Good high temperature oxidation resistance (heat resistance);
Good hot and cold processing technology (mainly cold bending deformation and weldability).
Main features of boiler steel plate

Since boiler steel plates are important products, the safety and reliability requirements are strict, and the manufacturing technology is difficult. Therefore, the materials must have the following main features:
The material has high yield strength performance in a certain temperature range (medium temperature and high temperature);
The material has sufficient toughness and no brittle failure occurs during manufacture or use;
The material has a small strain aging sensitivity, especially in the corresponding working temperature region, to ensure a certain value of aging impact work;
The material has a low notch sensitivity and can prevent cracks in the steel in the areas of welding, opening, and local stress concentration;
The material has good welding properties;
The material has a good microstructure and no white spots or cracks are allowed.