| Hengyang Valin implements the strategy
of development with science and technology, continuously importing, adapting,
and absorbing state-of-the-art equipments and technology in seamless pipe industry,
its total installation level is of the leading position in the world. There are
three sets of hot rolling mills, one set of cold drawing mill, three sets of EAF
steel making equipment and other auxiliary equipment, the total number of equipment
are 6580, among which 180sets are imported equipment. Main equipment are of the
international and domestic advanced level.
Brief Introduction of the Iron Making Project of
HengSteel：Hengyang Steel launched the 1.2 billion yuan total investment
Iron Making Project in July, 2007 in order to solve the problem of raw material
supply for the EAF steel making for the MPM production line, to enhance the steel
quality and cleanness, to realize choice material supply and reduce energy consumption,
to realize upgrading of product structure, and to speed up the progress in building
Hengsteel into a world firstclass, professional seamless steel tube producer.
The project includes a new 1,000 m3 blast furnace with average annual utilization
coefficient of 2.357t/(m3.d), and annual output of 825,000 tons of iron, one 130
m2 sintering machine with utilization coefficient of 1.35t/m2.h, and annual sintering
output of 1,389,000 tons.
The material charge for the blast
furnace adopts the technology of high efficiency ore and coke vibration screen,
and the charging material are recycling egg coke mixed with the sinter. The working
volume is 1,000 m3, stout type; the hearth diameter is 7.7m, with twenty tuyures;
the furnace roof is adopted a series hoppers Bell-less top and a rotating chute
distributing , the hopper volume is 22.3m3 , furnace body is covered with the
full cooling stave , carbon block and ceramics for the under hearth and hearth
structure, the tuyere are built by the composite Brown fused alumina brick, AlB2BOB3B-C-SiC
combined bricks are applied for the iron notch; three high temperature long life
roof ignition hot blast stoves are laid in one line; residual heat collection
equipment is used, with the residual heat being able to support the air and mixed
gas combustion; the hot blast temperature is 1200~1250℃, and the laid brick non-maintenance
life is ≥ 25 years.
There is no combustion chamber
for a roof ignition-type hot blast stove, the usage rate of the effective checker
chamber’s area is improved, the checker hole diameter of the checker chamber is
Φ30mm, the heating area is 84.0m2/m3 with a very high heat exchange area; the
cast house is rectangular shape, four choke plugs railway which control the hot
metal discharging are arranged, 100 tons hot metal tank transfer car is used for
transporting the hot metal, with a total area of 2,000 m2; the angle between the
two tap holes is 80°, each tap hole has their independent clay gun, tapping machine
and oscillate out spout and other equipment.
Double pulverized coal injection
hoppers, major injection pipe plus distributor in front of furnace are adopted
for the pulverized coal injection system to directly injection into the blast
furnace; one single series full negative pressure milling system is used; single
medium speed grinding mills with maximum output force of 21t/h, normal output
force of ≥ 16t/h is applied; AV56-14 full static electrical axial flow blast blower
with adjustable vanes is used for the blast station, the annual blast volume is
2,627 m3/min., the blast pressure at the exit is 0.45MPa, the 10kV asynchronous
motor is in position with a power of 14,500kW.
The crude gas gravity dust catcher
and dry bag filter are used for gas purifying; international advanced Jiaheng
water slag treatment technics is used for the slag treatment.
The technical flow collocation
such as pre-crush of the fuel, material proportioning, mixed grain making, material
distribution, sintering, crushing, cooling, crush screening, the sampling for
the sinter, testing, and storage are reasonable - the flow and logistics are smooth.
The 130 m2 sinter was designed
based on a series of historical experiences on successful sinters, based on the
adoption of further advanced technologies, and based on the practical sinters
production in domestic industries. The maximum treatment capacity is 468 t/h；the
water cooling axis type single roller crusher with the size ofφ1700×2900 is installed
in the end of the sinter strand, and the hot sinter grain size after crushing
is less than 150mm, and the maximum crushing capacity is 405t/h.
In addition, for environmental
protection, the project takes “Pollution Prevention is a priority, combining Anti-Pollution
with Treatment” and “Clean Production, Sustainable Development” as guidelines,
conducted full process control for production as well as anti-pollution and environmental
treatment, apply new techniques, new technologies, new equipment as to improve
the utilization of resources and energy, eliminating the maximum amount of pollution
during the production process.
The investment in environmental
protection facilities – including waste water treatment, waste gas treatment facilities,
noise treatment facilities and afforestation etc. – amounts to 230 million Yuan,
or 19.8% of the total investment.
Brief Introduction of the Iron Making Project of HengSteel
Steel making facilities: Super high power EAF for small size billet –refining ladle furnace—vacuum
degasser—full horizontal round billet production process, there
are 2 sets of 45 tons super high power electric furnaces, three
sets of 45 tons ladle furnaces, one set of vacuum degasser, three
sets of tow strands horizontal continuous casters. The in house
developed horizontal continuous casting technology has reached
the Chinese and international leading level . Bow type continuous
casting process for large size billet production adopts the super
high power EF—refining furnace—vavuum degasser—four strands bow
type continuous casting process, there is one 90 tons super high
power EF,one 100 tons ladle refining furnace, one 100tons vacuum
degasser, one four strands bow type caster.
Steel making facilities
Steel making facilities
is a large size seamless steel pipe production line newly built by Hengyang Steel,
it is a key project of Hengyang steel, it is also a foundation stone for Hengyang
Steel to realize the goal of 3 million annual production capability. The designed
annual capacity is 150,000tons per year, size range is Φ273～720×8～120mm.
The main products are: structural
seamless steel pipe, low and medium pressure boiler seamless steel pipe, high
pressure boiler seamless steel pipe, high pressure fertilizer equipment seamless
steel pipe, oil cracking seamless steel pipe, stainless heat resistant seamless
steel pipe, hydraulic cylinder hot rolling seamless steel pipe, fluid transmission
seamless steel pipe, casing and coupling, gas bottle seamless pipe and etc., among
which 70,000 tons are high grade seamless pipes need to be heat treated.
Φ720 mill adopts periodic rolling
mill to produce hot rolling seamless steel pipe, it extends the size range of
the products producing by existing 340 mill to over F720mm, together with other
mills, it helps to form a complete seamless steel pipe production mill series.
It has the advantages of producing lots of varieties, large sizes, heavy wall
thickness, focuses on producing very large sizes, very heavy wall thickness and
high alloy seamless steel pipes.
φ89、φ219、φ340 hot rolling mills：φ89
mill was built in 1990s, it adopts tow roll cone type piercing—six
stand semi floating mandrel MPM—24 stands stretch reducing process,
main production facilities were imported from Germany, the overall
facility level reaches the international advanced level; φ340
production line built in 2005 adopts the two roll cone type piercer—five
stands retained mandrel bar MPM—12 stands sizing mill , it also
configured with high level on line heat treatment facilities and
specialized purpose usage pipe finishing line, there are multi
functioned and multilayer on line wall thickness, length , OD
measureing and NDT facilities, the piercer, MPM and sizing mill
were imported from Germany, the overall technical facilities stands
for today’s leading position in the world. Theφ219 mill adopts
two roll cone type piercing—three roll pipe rolling-dual 12 stands
reduction process, there are multi functioned and multilayer on
line wall thickness, length , OD measuring and NDT facilities
φ50 cold drawing
line：it adopts peircer, pickling, high precision cold drawing
machine, continuous annealing, high precision 17 roll straightener.
φ50 cold drawing line
line：it has pipe end upsetting machine, water quenching facility,
gas tempering furnace, straightener and other equipment;
Two casing processing
lines: there are quenching heating furnace, tempering furnace,
six roll straightener, NDT facilities, Hydro static testing machine,
numerical control threading machine, coupling screwing on machine,
the main products were imported from Belgium, Janpan and other
countries, it has the capability to process OCTG with various
sizes and threads, it has an annual capacity of 500,000 tons heat
treatment and 45,000tons of OCTG processing .
casing processing line
established an inspection and testing center in2006, purchased
advanced inspection equipment from both domestic and overseas,
it has X ray fluorescence spectrometer, scanning electronic microscope,
high temperature long lasting intension testing machine, electronic
high temperature creeping testing machine and various testing
machines over 200 sets.