SDM has the unique ability of design, general contracting, startup
escort, diagnosis and upgrading of the original production line in the field of
steel rolling and steel deep processing. It can provide customers with
integrated solutions from raw materials to products and from products to
products, system integration and diagnosis experts. The main fields involved
are:
Bar production line, wire production line,
special steel production line, H-beam production line, hot rolled strip
production line, hot rolled wide and heavy plate production line, cold rolled
strip production line, as well as steel distribution center and processing
center, steel deep processing, etc.
The main characteristic technologies include: high rigidity short
stress line rolling mill, controlled rolling and controlled cooling technology
for producing fine grain steel, bar line strengthening collection system,
section steel automatic bundling machine, energy-saving digital reheating
furnace technology, short stress line rolling mill cleaning machine, special
steel online chamfering technology, high-precision temperature controlled
chamber furnace, temperature controlled slow cooling technology, special steel
finishing line integration technology, special shaped steel rolling and pass
development technology, high temperature alloy and titanium alloy rolling
technology, single line production integration technology with an annual output
of 2 million tons of bar, automatic labeling and welding robot technology,
water mist dust removal technology of rod and wire mill, noise reduction
technology of sawing machine, automatic stacking and finishing technology of
section steel, etc.
Integrated production technology of single
line bar with annual output of 2 million tons:
Energy saving digital reheating furnace
technology:
SDM innovates and researches a new generation of bar production
technology. The single line production capacity of the production line reaches
2 million tons/year. The production line has the ability to develop high
strength, weather resistance, low temperature resistance and other high
strength special rebart. The new generation of bar production line is equipped
with advanced technologies such as online measurement system, temperature field
control system, remote regulation system, intelligent equipment management and
control.
Technology of producing fine grain steel by
controlled rolling and controlled cooling
The fine grain rebar is produced by
controlled rolling and controlled cooling. The grain size is above grade 10,
which is fine grain strengthening. The process of controlled rolling and
controlled cooling developed by our company is based on 20MnSi steel grade
without adding micro alloy, which can produce fine grain rebar with yield
strength above 440mpa and strength yield ratio above 1.25 (meeting the seismic
requirements), and the strength does not decrease significantly after aging;
the cost of alloy is saved about 50 yuan/ton.
The following figure shows the grain size
test results and metallographic structure of HRB400 steel bar in the core,
middle layer and outer layer under the condition of controlled rolling and
controlled cooling. It can be seen from the figure that the grain size of the
product can reach grade 10.0.The microstructure is mainly composed of ferrite
and pearlite, and there is partially tempered martensite in the outer layer of
the rebar, with the thickness of 0~375μm, but it is not closed, which does not
affect the performance.
Strengthening collection system of bar
line:
Strengthen the collection system, change
that the traditional annual output of 1.3 million tons of steel needs two sets
of collection system, save equipment investment and personnel quota, increase
the finished product warehouse area. It can count and split steel automatically
to realize full length delivery.
Automatic stacking and bundling marking
technology for section steel:
SDM’s automatic stacking and bundling
marking technology covers automatic stacking machine, automatic bundling
machine, automatic jet printing robot, automatic labeling robot, etc. under the
MES system of production line, it can realize the automatic operation of the
whole process of steel finishing and collection, and realize intelligent
production.
Short stress line mill cleaning machine:
The working environment of bar production
line in our company is relatively poor, the components & parts of rolling
mill are easy to be dirty and damaged, and the mill disassembly frequency is
high. Independently developed one new type of automatic short stress line mill
cleaning machine.
Main technical features: environment
friendly, high production efficiency, low labor intensity, clean up
Energy saving digital reheating furnace
technology:
The main technologies are:
1. Digital reheating furnace technology
2. Regenerative combustion technology
(single air regenerative, double air gas regenerative)
3. Vaporization cooling technology of
walking beam reheating furnace
4. Comprehensive technology of modern
walking beam reheating furnace
Special steel online chamfering technology:
Our company independently develops one new
type of chamfering machine according to the needs of special steel chamfering.
It has multi head type of mechanical milling cutter; stable & reliable
operation and low failure rate, less maintenance and low maintenance cost,
high-quality chamfered surface.
