High pressure boiler tube production manufacturing method

1. The general boiler tube temperature is below 450℃, domestic pipe is mainly made of No. 10, no. 20 carbon bonded steel hot rolled pipe or cold drawn pipe.

2. High-pressure boiler tubes are often used under high temperature and high pressure conditions. Under the action of high temperature flue gas and water vapor, oxidation and corrosion will occur. The steel pipe is required to have high durable strength, high oxidation corrosion resistance and good microstructure stability.

3. High pressure boiler tube is a kind of boiler tube, belongs to the seamless steel tube category. The manufacturing method is the same as seamless tube high pressure boiler tube, but there are strict requirements on the grade of steel used to manufacture steel tube. High-pressure boiler tubes are often used under high temperature and high pressure conditions. High pressure boiler tube is mainly used to manufacture superheater tube, reheater tube, conduit pipe, main steam pipe and so on of high pressure and ultra high pressure boiler.

4. Because boiler tube works under high temperature and high pressure for a long time, material will creep, plasticity and toughness decline, original organization change, corrosion and so on. Steel tubes used as boilers shall have :

(1) Adequate durable strength;

(2) Sufficient plastic deformation capacity;

(3) Minimum aging tendency and thermal brittleness;

(4) High oxidation resistance, coal ash resistance, high temperature resistance to natural gas corrosion, steam and stress corrosion performance;

(5) Good organizational stability and good process performance.

The steel of high pressure boiler tube is carbon steel and pearlite, ferritic and austenitic stainless heat resistant steel. In order to improve the thermal efficiency of thermal power generating units and reduce fuel consumption, the development of large capacity, high parameter (high temperature, high pressure) thermal power generating units (more than 1000MW) is given priority to in the world. Steam pressure increased to 31.5 ~ 34.3MPa, superheated steam temperature up to 595 ~ 650℃, to the development of ultra-high pressure critical pressure, so high pressure boiler tube put forward higher requirements. A new steel grade was developed to meet the demand of high parameter power plant boiler.