What kind of material is TP347HFG

The difference between TP347H and TP347HFG TP347HFG is a chromium-nickel-niobium austenitic stainless steel with the same composition as TP347H but different processing and processing processes.

TP347HFG developed abroad is based on TP347H, which achieves finer grain size through special heat treatment and heat processing.

grade, which improves the resistance to vapor oxidation. Sumitomo Japan.

It is aimed at the two problems of TP347H: one is that the steam side of TP347H will produce oxide layer spalling under the action of thermal cycling, and then block the elbow pipe, resulting in overheating and failure; Second, the spalled oxides will be brought into the steam turbine, so that the steam turbine has serious erosion and has been improved: the dissolution and precipitation mechanism of fine niobium carbide is used, and a new, higher solution treatment is adopted.

temperature of the heat treatment process.

The grains of TP347H are greatly refined.

TP347H steel is a niobium austenitic type heat-resistant stainless steel, with good creep resistance and high temperature oxidation resistance, and the allowable oxidation temperature of the tube is 705, which is mainly used for subcritical and supercritical pressure parameters of large power generation boiler superheaters, high-temperature sections of reheaters and high-temperature pipelines and other components.

1: Grade 347H

Two: chemical composition.

Carbon C: Manganese Mn: Silicon Si: Chromium Cr: Nickel Ni: Phosphorus P: Sulfur S: Niobium Nb: (8C

Three: the scope of application.

Due to the presence of stabilized element NB, its resistance to intergranular corrosion and polysulfuric acid intergranular stress corrosion is good, and its corrosion resistance is similar to that of 18-8 austenitic stainless steel containing Ti in corrosive media such as acid, alkali and salt, so it is widely used in boilers, power generation, petroleum, chemical industry, synthetic fiber, food, paper and other industries. Heat exchangers for large boiler superheater tubes, reheater tubes, steam piping and petrochemical industries.

Four: Overview. It has high high-temperature strength and high-temperature plasticity.

It has excellent oxidation resistance and corrosion resistance. It has good tissue stability. The chemical composition is homogeneous.

It has good processing performance and welding performance. High dimensional accuracy and surface quality.

<> stainless steel. TP347H is actually a high-carbon niobium-containing Cr-Ni austenitic stainless steel, with the stabilizing element NB, which can resist corrosion chain and corrosion, and is widely used in many industrial fields such as boilers, power generation, petrochemical industry, and synthetic fibers. It can also be used in superheater tubes, reheater tubes, neat tubes and heat exchangers of large boilers.

Compared with the 316 series, TP347H has better high temperature resistance and stronger oxidation resistance, and is often used as a hot strength steel. In the boiler tube, the highest antioxidant heat is about 750 degrees.