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DIN17175 20G 20MG 25MnG High Pressure Boiler Steel Tube Seamless Steel Pipe
Product Introduction
High pressure boiler tube is a kind of boiler tube, belongs to the
seamless steel pipe category. The manufacturing method is the same
as the seamless tube high-pressure boiler tube, but there are
strict requirements on the steel type used in the manufacture of
the pipe. High pressure boiler tubes are often used under 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, guide pipe, main steam
tube, etc.
The boiler tube works under high temperature and high pressure for
a long time, the material will creep, plasticity and toughness will
decrease, the original structure will change, corrosion will occur
and so on. As a boiler steel pipe should have :(1) sufficient
lasting strength; (2) sufficient plastic deformation capacity; (3)
minimum aging tendency and thermal brittleness; (4) High oxidation
resistance, coal ash resistance, resistance to natural gas
corrosion at high temperature, steam and stress corrosion; (5) Good
tissue stability and good process performance. The steel of high
pressure boiler tube includes carbon steel, pearlite, ferrite and
Austenitic stainless heat resistant steel. In order to improve the
thermal efficiency of thermal power generation units and reduce
burnup consumption, the development of large capacity, high
parameters (high temperature, high pressure) thermal power units
(more than 1000MW) are the main development in the world. The steam
pressure increased to 31.5 ~ 34.3MPa, the temperature of
superheated steam reached 595 ~ 650℃, to the development of
ultra-high pressure critical pressure, so the high pressure boiler
tube put forward higher requirements. A new type of steel has been
developed to meet the demand of high parameter power plant boilers.
Production and Manufacturing Method
(1) The general boiler tube temperature is below 450℃, the domestic
tube is mainly made of 10, 20 carbon junction steel hot rolled tube
or cold drawn tube.
The high pressure boiler tube is often used in high temperature and
high pressure conditions of the tube under the action of high
temperature flue gas and water vapor, oxidation and corrosion will
occur. Steel tubes are required to have high durable strength, high
oxidation corrosion resistance, and good tissue stability.
(2) Purpose:
① The general boiler tube is mainly used to manufacture water wall
tube, boiling water tube, superheated steam tube, superheated steam
tube for locomotive boiler, large and small smoke pipe and arch
brick pipe, etc.
② High pressure boiler tube is mainly used to manufacture high
pressure and ultra-high pressure boiler superheater tube, reheater
tube, guide pipe, main steam tube, etc.
The production process of high pressure boiler tube varies with
different steel types. For example, the production process of the
boiler tube is characterized by :(1) the tube billet should be
peeled, and the peeling amount is usually 5mm; (2) Because the
steel is hard, the tube blank is cut or sawed with oxygen; (3)
Because the thermal conductivity of chromium-molybdovanadium steel
is lower than that of carbon steel, the heating speed should be
slightly slower, the heating temperature is 1120 ~ 1180℃, the
perforation temperature is 1100 ~ 1160℃; (4) This kind of steel in
the range of 1000 ~ 1100℃ has good plasticity and low deformation
resistance, so the perforation performance is good, deformation
parameters can be selected according to carbon steel or alloy steel
(such as 30CrMnSiA); (5) After rolling steel pipe to normalize and
temper, the normalizing temperature is 950 ~ 980℃, tempering
temperature is 730 ~ 750℃, holding time is 2 ~ 3h; (6) The size
tolerance of the steel pipe is strict to ensure the welding of
pairs; The pipe length should be as long as possible to reduce the
number of welds.
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FAQ
Q: Do you provide samples ?How can I get a sample to check your
quality? Is it free or extra ?
A: Free samples are available for your checking and testing. And to
get free samples, you need to send us you detailed receiving
address (including post code) and your DHL/FedEx/UPS account for
collecting samples, courier cost will be paid in your side.
Q: How is the quality of your products?
A: Our products are manufactured strictly according to national and
international standard, and we take a test before delivered out. If
you want see our quality certifications and all kinds of testing
report, please just ask us for it.
Q: Are you factory or trader?
A: Our company has been manufacturing and selling steel products for many years
since 2009. We've gained our Export Right and become an integrated
company of industry and trade in order to satisfy buyer's
multi-request on different material and products.