High pressure boiler tube manufacturer

Boiler tube is a kind of seamless tube. The manufacturing method is the same as that of the seamless pipe, but there are strict requirements for the steel used in the manufacture of the steel pipe. According to the use of temperature is divided into general boiler tube and high pressure boiler tube two. The mechanical properties of the boiler tube is an important indicator to ensure the performance (mechanical properties) of the steel, which depends on the chemical composition and heat treatment system of the steel. In the steel pipe standard, according to different requirements, the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness index, as well as high and low temperature performance required by users.

Introduction

Boiler tube is a kind of seamless tube. The manufacturing method is the same as that of the seamless pipe, but there are strict requirements for the steel used in the manufacture of the steel pipe. According to the use of temperature is divided into general boiler tube and high pressure boiler tube two. The mechanical properties of the boiler tube is an important indicator to ensure the performance (mechanical properties) of the steel, which depends on the chemical composition and heat treatment system of the steel. In the steel pipe standard, according to different requirements, the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness index, as well as high and low temperature performance required by users.

Introduction

High pressure boiler tube is a kind of boiler tube, which belongs to the category of seamless steel tube. The manufacturing method is the same as that of the seamless tube high-pressure boiler tube, but there are strict requirements for the steel used in the manufacture of the steel tube. High pressure boiler tubes are often used in high temperature and high pressure conditions. High pressure boiler tube is mainly used to manufacture high pressure and ultra high pressure boiler superheater tube, reheater tube, gas pipe, main steam pipe, etc.

Due to the long-term work of the boiler tube under high temperature and high pressure conditions, the material will creep, the plasticity and toughness will decrease, the original structure will change, and corrosion will occur. As a boiler steel pipe should have:(1) sufficient lasting strength;(2) sufficient plastic deformation capacity; (3) min aging tendency and hot brittleness;(4) high oxidation resistance, coal ash resistance, natural gas high temperature corrosion, steam and stress corrosion resistance;(5) good organizational stability and good process performance. High-pressure boiler tubes are made of carbon steel and pearlite, ferrite and austenitic stainless heat-resistant steels. In order to improve the thermal efficiency of thermal power generating units and reduce fuel consumption, countries around the world are mainly developing large-capacity, high-parameter (high-temperature, high-pressure) thermal power units (more than 1000MW). The steam pressure increases to 31.5~34.3MPa, the superheated steam temperature reaches 595~650 ℃, and develops to the ultra-high pressure critical pressure, which puts forward higher requirements for the high-pressure boiler tube. To this end, new steel grades have been developed to meet the needs of high-parameter utility boilers.

Use classification

Used for heating surface pipes of low and medium pressure boilers (working pressure is generally not more than 5.88Mpa and working temperature is below 450 ℃); Used for heating surface pipes, economizers, superheaters, reheaters, petrochemical industry pipes, etc. of high-pressure boilers (working pressure is generally above 9.8Mpa and working temperature is between 450 ℃ and 650 ℃).

According to the classification of constituent materials, it can be divided into 20G high-pressure boiler tube, 12Cr1MoVG high-pressure boiler tube, steel 102 high-pressure boiler tube, 15CrMoG high-pressure boiler tube, 5310 high-pressure boiler tube, 3087 low and medium-pressure boiler tube, 40Cr high-pressure boiler tube, 1Cr5Mo high-pressure boiler tube, 42CrMo high-pressure boiler tube.