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DIAMOND STEEL PRODUCTS CO. (PVT.) LTD

Owning to the success of the re-rolling mill and high customer demand, a second mill was established in 1976 at Shyampur, known as Diamond Steel Products Private Company Limited.

RSM B300A-R(40)

Mechanical Property :

Steel GradeStandard  Frog MaskYield Strength (Mpa)Ts/Ys ratioElongation%(G.L = 5D)EMF%
   MinMinMinMin
300A-RBDS ISO 6935-2:2016RSM 40// Dia // B300A-R3001.02162

Chemical Property :

Steel Grade 

Standard

Frog Mask

C%(Max)

mn% (Max)

Sl%(Max)

S%(Max)

P%(Max)

CEV%()Max

B300A-R

BDS ISO6935-2:2016

RSM//Dia//B300A-R

0.060

0.060

 

Billet Reheating and Hot Rolling

 * This process initially start from the Re-heating furnace.

*Stacking of billets is done on the hot charging area through overhead crane.

*Continuous pushing of billets, that are placed parallel to each other, is then followed through hydraulic or mechanical pusher.

*Different zones are divided in the furnace depending on the capacity of hourly heating for temperature control.

*The billets are then heated to their discharge temperature through air along with colossal burners in the furnace.

Through Ejectors the material is drawn out once the billet has reached the “Discharged Door” and moreover the
computer system has determined that the billet has been effectively heated.
After this process, rescaling is carried out. This is done by passing the billet all the way through the rescaling unit. Pressurized water is used to dispatch the thick layer of oxidized iron collected at the surface of the billet during the stage inside the reheat furnace. After successful rescaling, the billet has to go through slitting systems. These are mainly utilized for permitting the rolling of rebars in several stands. This helps in augmenting the productivity of rebars of small size considerably, keeping the speed of finishing constant.
 
The process is further continued with roughing. For this, a roughing mill is used, which is made up of different independent rolling stands. Rolling of billets, that are heated in the furnace, is done continuously till they obtain bright orange-yellow color. After this, high pressure water jets are used for cleaning of scale or oxidized iron.
The thickness of the leading edge of the bar is then estimated once the transfer bar exits the final roughing mill stand. The temperature profile, from top to bottom, of the produced bar is then measured by a pyrometer.
 

Application

RSM B300A-R(40)

Applicable in low rise structure where dynamic load is not considerable. It has the wide application in pile and slab construction

RSM Deformed Bar Reckoner

Nominal Diameter(mm)Anno (mm²)Kg/MeterPermissible Deviation(%)Meter/TonFeet/Ton
850.30.395±82531.68313
1078.50.617±616225320
121130.888±+1126.43694
162011.58±5633.62078
203142.47±5405.51330
223802.98±4335.11099
254913.85±4259.5851.2
286164.84±4206.9678.6
328046.31±4158.4519.5
4012579.86±4101.4332.5

Bend & Reband Test Requirement :

Standard

Nominal Bar Diameter, D (mm)

Mandrel Diameter (Max)

 

Standard

Mandrel Diameter (Max)

 
  

Ben ( 160-180)

Rebend

 

Ben ( 180)

Grade 60 (420)

Ben ( 180)

Grade 80 (550)

 

8

3D

5D

 

3D

3.5D

 

10

3D

5D

 

3D

3.5D

 

12

3D

5D

 

3D

3.5D

 

16

3D

5D

ASTM A706/A706M

3D

3.5D

BDS ISO 6935 – 2:2016

20

6D

8D

 

4D

5D

 

22

6D

8D

 

4D

5D

 

25

6D

8D

 

4D

5D

 

28

6D

10D

 

6D

7D
 

32

6D

10D

 

6D

7D

 

40

6D

10D 

8D

9D

 

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From the modest beginning in 1958, Rahim Group has today grown into one of the leading steel manufacturers of Bangladesh.

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