DIAMOND STEEL PRODUCTS CO. (PVT.) LTD

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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 Grade	Standard	Frog Mask	Yield Strength (Mpa)	Ts/Ys ratio	Elongation%(G.L = 5D)	EMF%
			Min	Min	Min	Min
300A-R	BDS ISO 6935-2:2016	RSM 40// Dia // B300A-R	300	1.02	16	2

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/Meter	Permissible Deviation(%)	Meter/Ton	Feet/Ton
8	50.3	0.395	±8	2531.6	8313
10	78.5	0.617	±6	1622	5320
12	113	0.888	±+	1126.4	3694
16	201	1.58	±5	633.6	2078
20	314	2.47	±5	405.5	1330
22	380	2.98	±4	335.1	1099
25	491	3.85	±4	259.5	851.2
28	616	4.84	±4	206.9	678.6
32	804	6.31	±4	158.4	519.5
40	1257	9.86	±4	101.4	332.5

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