Mill rolls are essential in the metal working industry. They are manufactured to an optimum hardness to resist wear and prevent marking. Forged steel roll is a type of rolling mill rolls. The roll has a microstructure which allows the surface finish to be resistant to thermal shock and a hardness depth prevent from rehardening in subsequent applications.

Firstly, we give some basic knowledge about the forged steel roll including the definition, types, feature, chemical composition, etc.

What Are Forged Steel Roll

Forge steel roll provides a mill roller solution for rolling mill. It is one of the most wear parts during the rolling process. It is mainly made of forged steel. It is forged in hydraulic presses for high toughness and pureness, widely used in cold rolling mill, steckel mills and continuous hot strip mills. As different rolling mills have specific requirements and various rolling conditions, different alloy elements can be added into the steel for higher performance of the roll. The roll covers forged steel work roll or intermediate roll, forged steel back up roll.

Forged Steel Roll

Definition

The forged steel rolls are made from steel ingots by forging, which can solve metallurgical defects such as loose and shrinkage holes in the ingot, and crush the coarse cast structure to obtain superior quality roll with high resistance.

The production process includes smelting, ingot casting, forging, post-forging heat treatment, rough processing, final heat treatment and finishing.

Feature

High Toughness

Surface Hardness Uniformity

Fatigue Resistance

High Hardness And Durability

Application

It is mainly used as strip rolling mill working roll and backup roll and is a high speed roll (HSS roll) for tandem and reversing cold reduction mills.

Forged Steel Back Up Roll

Definition

The forged back up roll is a mill roll that supports the work roll and intermediate roll for the purpose of avoiding deflection of the work roll and affecting on the yield and quality of the plate and strip rolling mill. This is the key function of back up roll to ensure the operation of the whole rolling mill. The common materials are 9Cr2Mo, 86CrMoV7, 70Cr3Mo with 0.80% to 0.95% carbon content 2% Cr content. The diameter of roll body ranges from 350mm-1600mm.

Feature

High Rigidity

The back up roll requires high rigidity to ensure the smallest deformation for supporting work roll.

Good Fatigue Resistance And High Peeling Resistance

The backup roll always need to support work roll or intermediate roll. Overloadig cause the subcutaneous miccrocrack propagation and roll body peeling off. So the excellent fatigue resistance is necessary.

High Surface Hardness With Good Hardness Uniformity

Outstanding surface hardness ensures the exceptional wear resistance and can reduce the formation of concave roll shape.

Excellent Yield Strength And High Toughness

To guarantee the long service life, the deep hardened layer of roll body, good strength and toughness of roll neck and roll body and strong anti-accidents are required.

Application

Forged steel back up roll is applicable for 4-Hi mill, 6-Hi mill, and other some small mill.

Usually electric motors are used to start diesel engines. When meeting the lack of maintenance, no charge of battery, or power is down, the engine will not start normally. When in an emergency occasion, the consequence is serious. Mechanical starter, which is an efficient non-electric engine starting device, can solve the starting problem when the battery is low and can start a diesel engine without electricity, purely depends on the hand crank system for engine start.ing

What’s The Mechanical Starter

The mechanical starter is a device to start the engines without electricity. Electric batteries are one of the most common power sources for engine start. But the batteries always can’t work in the extreme low temperature, damp and harsh environment and the hand crank starter will be the ideal choice. This is the reason why marine, offshore oil, underground mining need a mechanical start device.

Advantages of Mechanical Starter

1.Effective In Extreme Low Temperature

When in a cold weather, cranking an engine is a hard work and takes much more energy with the thickened viscosity of the oil. The engine may not crank fast enough to start. The low temperature will slow down its chemical processes of a battery, which makes the power becomes lower.

The mechanical engine starting system doesn’t require the battery and is a mechanical device which only relies on manpower can start the diesel engine with displacement up to 50L.

2. Independent Startup System

Mechanical engine starter has an independent starting system does not require hydraulic, pneumatic nor electricity and no auxiliary equipment is required.

3. Simple Hand Crank System

Mechanical starter has an important back up solution when everything else fail, an option for hand crank charging. The operation is simple with winding the handle and pushing the release lever, then the starting process being completed. The maintenance is also easy.

4. Environmentally friendly

The mechanical starting system has no energy consumption and no pollution emissions. Used batteries will pollute the environment and the decay of the battery will produce toxic substances

5. Lightweight And Minimizing Space

With simple manual crank system, the mechanical engine starter will not take up much space. It’s lightweight and easy to carry.

The mechanical starter solves the problem that the engine can’t start when the power of battery is low or out of power. It has a simple manual crank system with flexibility and reliability.

1. Carbon Content

The carbon content of hot-rolled steel can be slightly higher than that of cold-rolled steel. The density is the same when there are little differences in the components.

2.Density

The density and composition of hot rolled steel can be checked through looking for various steel to find the specific one. Cold rolled steel has high hardness and relatively has difficult for processing, but it is not easy to deform and has high strength.

3. Production Process

The production process of hot-rolled steel and cold-rolled steel is different. Hot rolling steel is rolled at high temperature and cold rolling steel is processed from hot rolled steel at normal temperature. Generally speaking, cold rolled steel has better strength and hot rolled steel has better ductility.

What Are The Differences Between Hot Rolled Steel And Cold Rolled Steel

1.The Surface

The cold steel plate is cold rolled and the surface has no oxide scale with good quality. The hot steel plate uses hot rolled processing technique with oxide scale on the surface.

2. Toughness & Stretchability

Hot rolled steel has poor toughness and the price is low, while cold rolled steel has good stretchability and toughness, but the price is more expensive

3.Mechanical Properties

The cold rolled steel has much better mechanical properties than hot rolled steel.

4. Formability

Since the surface of cold rolled steel is better than hot rolled one, the forming effect also better than that of hot rolled steel.

5. Torsion resistance

Hot rolled steel has higher free torsional stiffness than cold-rolled steel, so the torsional properties of hot-rolled steel are better.

6. Smoothness

The smoothness of cold rolled steel sheet is better than that of hot rolled sheet.

Overall, cold rolled steel has better performance than hot rolled steel, but cold rolling process will cost more and the cold rolled steel has higher price than that of hot rolled one. People should choose the suitable one according to their needs. No matter what types of the rolling is, the mill rolling process plays an important role in steel making and mill roll is essential for the perfect dimensions.

Maybe different people have different views on hot rolled steel and cold rolled steel. Hope the simplified explanation will help people learn more about the two types of steel or steel plate.

The circumstances for using spring start motor

1. Extreme temperature and damp

Spring starter motor needs only hand cranking and releasing spring energy without other power consumption .Its resistances to damp and extreme temperatures make them ideal for marine applications.

2. Non-electric

Spring starter only requires manpower, no hydraulic, pneumatic or electrical infrastructure required. Don’t need to worry the battery has no charge and can be applicable for the dangerous area with prohibition of electric start.

3. Emergency

Spring starter motor can be used as the most suitable backup starting device with the storage spring energy for the emergency like fire-fighting, rescue, marine emergency, military, etc.

How the spring starter motor works

When needs to start a diesel engine, Pull the winding handle of the starter to make the release mechanism store in the energy for ready use. Wind the handle to turn in the prescribed direction to achieve the required storage energy and push the lever to release potential spring energy. Then the diesel engine can be started.

Two types of spring used for spring starter motor

Disc Springs

The springs are compressed by means of a ball screw

Feature:

simple to use

small space required

long-span life

High output torque

Power Springs

The springs are coil springs which are wound up

Feature:

High number of output revolutions

Compact

About Dalin Spring Starter

Dalin spring starter is manufactured by Chongqing Starting Power Unit Co., Ltd which was established in 2008. The company is specialized in the solutions for emergency of engine start and developed a special mechanical starter-Dalin spring starter, applied to military, fire, marine emergency, telecommunications, etc. It has a professional R & D team leading by senior engineer for superior quality products with advanced technology and rigorous services.

Displacement ranges from 0.5L-38L, which is the world record starting power of spring starter motor.

Single spring starter can start 6 cylinders in-line engine with displacement up to 19L, 16 cylinders V-type engine with displacement up to 30L. 0 group system can start up to 50L.

Spring starter group system can start 6 cylinders with the displacement up to 26L, 12 cylinders start up to 38L

Reliability

All products are tested by the unique spring starting test bench with experiment of more than 3000 starting cycles, ensuring all products have

detailed test data. The spring starter has the long-life span of more than 10 years according to customer’s feedback.

Cost Performance

All parts are made from mature material, produced by qualified heat treatment and machining process. On same power level of the starters, Dalin spring starter costs less than similar competing starter.

Simple and Safety Operation

It’s simple to operate. There’s not any auxiliary equipment to be configured, only adopting mechanical structure. The crank will not fly off or kick back during operation, which guarantee the safety of operation.

Services

Dalin spring starter provides excellent after-sale service with a professional service team，which can solve the problems of customers at any time.

Contact information

Sales : Julie He(Ms.),

Tel/Whatsapp/Wechat: +86-13637706003

Email: sales1@cqstart.com

Marketing : Harland Wang(Mr.)

Email：sundayritian@cqstart.com

Dalin spring starter motor, as a mechanical engine start device, provides a powerful and economical starting option for customers who need a simple device for the backup of their electric engine starter.

Hot rolling and cold rolling are the two main process for the most steel or steel plate making, which have great influences on the structure and properties of the steel. A better rolling mill roll will bring more superior quality steel. Which one is better between the hot rolled steel and cold rolled steel?

Some information about the hot rolled steel and cold rolled steel is introduced.

Hot Rolled Steel

Definition

Hot rolled steel is the finished product through directly processed on the steel mold in the steel furnace with exceptionally high temperatures, rolling with the hot mill roller which can make sure the dimensions of the steel sheet according to the requirements., then coiled and cooling. The main steel rolling type is hot rolling.

Advantages

Compact the steel structure and improve the mechanical properties.

Disadvantages

1.After hot rolling, delamination occurs, when the non-metallic inclusions in the steel are pressed into thin sheet. Delamination greatly deteriorates the tensile properties of the steel.

2. Residual Stress caused by uneven cooling. Residual stress is an internal self-phase equilibrium stress without external force. Hot rolled steel may have negative effects on deformation, stability, fatigue resistance, etc.

Cold Rolled Steel

Definition

The cold rolled steel bar is obtained by cold working of the hot-rolled steel, such as cold drawing and stretching at a normal temperature. Cold rolling is often used for the production of small sections and steel sheets.

Advantages

Cold rolled steel bar has fast forming speed and high output. It can be made into a variety of cross-sectional forms to meet the requirements of the different use conditions. Cold rolling mill can make the steel have a large plastic deformation.

Disadvantages

Torsion is prone to occur under bending. Bending and torsional buckling is easy to occur under compression. So the torsional performance of cold rolled steel is poor, and the ability to withstand concentrated loads is weak.

The engine is the source of all the powers and brings energy to modern society. The engine needs to turn over by the outside power so that it can operate under its own power. Spring starter is a mechanical engine starter can effectively start a diesel engine without external power.

Firstly, we look into

What’s the engine starter

Engine starter is the device for internal combustion engines by offering initial rotation, widely used for diesel engines, aircraft, portable generators, etc.

The types of engine starter

The main Engine starter types include pneumatic starter, hydraulic starter, electric starter, spring starter.

Pneumatic

Pneumatic engine starters also known as air starters are used for diesel engines, gas turbines, and some reciprocating engines. The compressor compresses the air for storage and they rely on the compressed air as energy for starting. They have a high power-to-weight ratio and high speed acceleration.

Hydraulic

Hydraulic engine starters are suitable for marine propulsion engines, diesel engines, and hydraulic fracturing equipment for oil & gas exploration. It is a motor that uses hydraulic energy to drive a diesel flywheel ring gear to achieve the ignition of a diesel engine. It can be used extremely cold weather, offshore and explosion-proof occasions.

Electric

Electric engine starters are the traditional starter motor. They are powered by batteries and electric convert to mechanical energy for start the ring gear on the engine’s flywheel, usually used in cars, ships, construction equipment, etc.

Spring

spring start motors are the mechanical devices which can rotate hand crank energy to mechanical energy through the compressed disc springs for storage, the potential energy in the springs being released by tripping, the starter pinion rotating the engine flywheel ring gear for starting a diesel engine, mostly used in the emergency situations where the reliability is required.

Pipe and Round Bar Straightening Machine

The pipe straightening machine is possible to straighten pipes and rods of Φ6-Φ30mm and use different types of straighteners for different specifications.

Specification

Straightening pipe diameter circumference (mm): Φ5~Φ20

Straightening pipe wall thickness (mm):0.5~4

Straightening tube yield strength (N/mm2): ≤392

Straightening speed (m/min): 32.5

Straightening roller angle adjustment range: 30°~33°

Straightening roller throat diameter (mm):Φ75

Straightening roller body length (mm): 100

Straightening roller distance (mm): 190

Allowable bending before adjustment (mm/m):≤30

One-time bending (mm/m): ≤1

Motor power (kW):1.5×2

Machine Dimensions (mm):1275x890x1405

Machine weight (Kg):1050

Straightening roller configuration: 2-2-2-2-2

Scrap Rebar Straightening Machine

Specification

Straightening range:Φ5-12mm

Straightening speed:14m/min

Motor power: 5.5kw、4kw

Feature

Due to rail guides, the steel bar can be moved in and out more smoothly anti-smash hook design is adopted. The dead bend can also pass through the alloy steel cutting device. The work lifespan is long.

The TINVO scrap rebar straightening machine is to change the shape of the steel bar into a straight strip that can be reused, by means of passing the old rebar and the waste round steel through several straightening rolls.

R4-R5 Continuous Casting Machine

R4-R5 continuous casting machine is a single unit single strand small continuous casting machine. It has a production capacity of 5-12 tons per hour. It’s suitable for electric furnaces of more than 1 ton, multi-furnace continuous casting and intermittent small batch casting. The user who has a lower factory building and no crane can install the continuous casting machine underground, which is convenient for manual bag pouring and electric furnace pouring.

R6 Multi-Strand Continuous Casting Machine

Technical characteristics

1. Simplified slab guiding device, low cost and easy maintenance

2. Five-roll four-drive straightening machine with a large pulling force

3. The auxiliary straightening machine can perform secondary straightening of the slab in the accident state.

4. Special flying shears can be quickly and accurately cut to length

5. The surface grinding rate is less than 5%

Process parameters

Model: Full arc continuous square billet continuous casting machine

Number of strands: 1, 2, 3, 4, 5, 6

Casting machine radius: 6, 8, 10m

Billet specifications: 80*80, 90*90, 100*100, 120*120, 150*150, 180*180, 200*200, 240*240mm

Rectangular billet: (120 ~ 200) (240 ~ 600)mm

Working speed: 0.6~1.2 m/min

Annual output: 10 to 150,000 tons /strand

Spill rate: ≤0.1%

Continuous pouring time: ≥8h

Φ80-150 Round Billet Continuous Casting Machine

The Φ80-150 round billet continuous casting machine refers to a machine that mainly produces tube blanks for seamless steel pipes and it adopts continuous cast steel iron-making technology. The continuous casting round billet is mainly used to produce seamless steel tubes of different calibers. When the round billet is passed through, the billet is required to have no cracks of surface and internal, and it is necessary to prevent the inner surface defects of the steel pipe which caused by large particle inclusions.

R8-R12 Rectangular Billet Continuous Casting Machine

The R8-R12 rectangular billet continuous casting machine is also included in the billet continuous casting machine, which is divided according to the size and shape of the cast section cast by continuous casting machine.

For more detail professional knowledge about CCM, you can visit introduction page of the TINVO steel making machinery.

1.Water-cooled Furnace Cover

The water-cooled furnace cover is the upper part of the arc furnace body, which can be moved. It is equipped with a discharge entry and a flue exit. It can be manufactured separately.

2.Water-cooled Furnace Wall

The water-cooled furnace wall is located in the middle of the furnace body. It consists of a water-cooled frame and multiple water-cooled plates. Due to transportation reasons, it can be manufactured separately according to the specific size. It is welded and assembled in the installation site.

3.Bottom Ring of The Furnce Cover

The bottom ring of the furnace cover is located at the lower end of the furnace body and plays a role in protecting the furnace wall.

4.Flue Elbow of Water-Cooled Furnace Cover

The water-cooled furnace cover flue elbow is a transitional connection for exhausting dust from steelmaking.

5.Eccentric Zone Water Cooling Plate

The eccentric zone water cooling plate is used for water cooling in the eccentric zone of the furnace door frame.

6.Ladle

The ladle is a container used for the transfer or refining of molten steel.

All above spare parts for steel making plant are supplied by TINVO and you can inquire the details through page of Contact TINVO Rolling Mill or the Email : inquiry@hrbtinvo.com.

The mechanical spring starter is the device for starting the enigne by hand, Dalin spring starter can be applied to each band diesel for the engine displacement from 1L-50L.

What’s the spring starters

Spring Starters are mechanical starters that use energy stored in a high-tech spring pack which is manually wound up and charged for instant release when required to start an engine. A Spring Starter is equivalent to a 5 hp electric starter.

The need for batteries, alternators, regulators and wiring is eliminated as the Spring Starter does not require electricity, compressed air or hydraulic pressure to operate.

Two-dimensional drawing spring starters

1 & 5 series Dalin Spring Starter Motor Series

1 & 5 Series Dalin Spring Starter Motor Series Which also is Hand Crank Starter can be used for starting a diesel engine, most application on engine displacement about the 1L—7.5L. The type of diesel engine includes CAT C4.4 , Perkins 1104 , Cummins 4B/6B , Weichai WP4/6 , Deutz BF3L913, Yuchai YC4F/4D.

2 & 4 Series Dalin Mechanical Starter

2 & 4 Series Dalin Mechanical Starter is a kind of engine starters, applied on engine displacement about the 8L—13L. The diesel engines include Cummins 6C , Cummins QSB7 , John Deer 6068 , Weichai WP10/12 , Deutz BF6M1015 , MWM TBD234 V6/V8/12.

3 & 6 Series Dalin Inertia Starter

3 & 6 Series Dalin Inertia Starter which also is a mechanical starter by compressing the springs with a hand cranking system, can be applied on engine displacement about the 14L—20L.( V16 max can reach 30L) such as Cummins NT855 , Cummins K19 , Scania DI13 , Vman D30 , Deutz BF12M1015 , Yuchai YC6T , Wudong WD287.