POSCO Maharashtra Steel

With POSCO

Products

Cold Rolled Steel

Cold Rolled steel sheets (CR) have fine surface and excellent workability. They are used for various purposes including automobiles, home appliances, furniture, office equipments, industrial machines and construction material. Due to economic development and the advancement in consumer's level, the customer are gradually requiring high quality of diversified and functionalized products. We POSCO Maharashtra are making our best effort to satisfy the customers with the optimum quality and continous improvement in our products.

Manufacturing Process

Top Notch Production Facilities

Classification POSCO Maharashtra PL-TCM
Date Of Operation June, 2014
Capacity (Ton/year) 1,800,000
Available Size Thickness (mm) 0.17~2.30
Width (mm) 800~1,880
Weight (Ton) Max 35
Product Grade Commercial, Drawing, Deep Drawing, Extra Deep Drawing, Structural, High-strength Steel, AHSS (DP590)
Inner Diameter (mm) 508(20”)/610(24")
Pickling

The hot-rolled coil passes through the pickling line, where hydrochloric acid solution is used to remove surface scale for its smooth surface finish before further processing.

Cold Rolling

Cold Rolling mill is of 6Hi Mill with 5 stand. Pickled coils are rolled in to the as normal as temperature (under of the re-crystallizing temperature) in the tandem cold rolled mills where they are processed into a specified thickness.

Electrolytic Cleaning

the main purpose of Electrolytic cleaning is to be remove in the lubricant oil and dirts left on the cold rolled strip before annealing.

Top Notch Production Facilities

Classification POSCO Maharashtra CAL
Date Of Operation June, 2014
Capacity (Ton/year) 1,000,000
Available Size Thickness (mm) 0.40~2.30
Width (mm) 800~1,860
Weight (Ton) Max 35
Product Grade Commercial, Drawing, Deep Drawing, Extra Deep Drawing, Structural, High-strength Steel, BH, AHSS (DP590)
Inner Diameter (mm) 508(20”)/610(24")
Annealing

To obtain the desired grain structure and to improve the mechanical properties, the strip is passed through the (continuous annealing line) furnace, heating, soaking and cooling sections.

SPM

In order to improve the mechanical properties, suppress yield point elongation strip shape correction to secure the flat shape, is to be obtain desired roughness, the steel sheet should be passed through a skin pass mill.

Inspection

The equipment at the exit section are composed surface defect detector, Inspection table and oiler equipment. The products are inspected as well as judged systematically, and whether such products are appropriate to a client company or not.

Specification & Properties

Types of Products, Characteristic and Application

The products are composed of various metal components and have various mechanical properties in accordance with design standard, depending on various sizes and uses, such as CQ,DQ, DDQ, EDDQ, Structural steel,HSS, AHSS and so forth.

Cold Rolled Mild Steel

Classification Specification Characteristic Application
Commercial Quality (CQ) CSP1 Used for the parts requiring bending & simple forming Refreigerator Doors, Drums, Furniture
CSP1D
Drawing Quality (DQ) CSP2 Suitable for drawing parts Filter Housing
Deep Draw Quality (DDQ) CSP3 Used for Deep drawing parts with good Drawability Roofs, Fenders and Hoods of Automobiles
CSP3N Non Ageing quality used for Deep drawing parts with good Drawability
Extra Deep Draw Quality (EDDQ) CSP3E Ultra Low Carbon Steel with excellent deep draw quality Side Panels, Quarters of Automobiles, Fuel Tanks Automobiles
Super Extra Deep Draw Quality (S-EDDQ) CSP3X

Mechanical Properties

Grade YS Max (Mpa) TS Min (Mpa) EL Min %
CQ - 270 28
DQ 200 270 33
DDQ 190 270 36
EDDQ 180 265 44
S-EDDQ 170 265 46

Cold Rolled High Strength Steel

Classification Specification Characteristic Application
Bake Hardening Steel (BH) PCY180B This is high strength material in which yield strengh is increased after baking to become more dent resistance & higher formability Automobile Outer panels like Hoods & Doors
PCY210B
HSLA (High Strength Low Alloy Steel) CHSP260Y This is High Strength Material manufactured by adding precipition hardening elements such as Ti, Nb to Low Carbon Steel. Kinds of Member-Reinforcing Materials
CHSP300Y
CHSP340Y
CHSP380Y
CHSP420Y
Rephosphorised Steel CHSP35R This is high strength steel manufactured by adding alloying elements such as Phosphorus (P) and Manganese (Mn). Cowl, Wheel Appron, Front Side member
CHSP40R
CHSP45R
IF HHS Steel CHSP35E This is ultra-low carbon steel with special elements such as Ti added. Used in automobile for high strength and deep drawability. Outer Panels of Doors, Hoods and Fenders, etc.
CHSP40E
CHSP45E
Dual Phase (DP) CHSP60DP This is high strength and high formability properties by its duel phase structure consisting of micro ferrite & martensite. Kinds of Member-Reinforcing Materials

Mechanical Properties

Classification Grade Guaranteed Value YS Min (Mpa) TS Min (Mpa) EL Min %
Bake Hardening Steel PCY180B YS 180 270 40
PCY210B YS 210 340 38
HSLA (High Strength Low Alloy Steel) CHSP260Y YS 260 350 28
CHSP300Y YS 300 380 22
CHSP340Y YS 340 410 18
CHSP380Y YS 380 460 18
CHSP420Y YS 420 490 16
Rephosphorised Steel CHSP35R TS 187 340 32
CHSPS40R TS 236 390 29
CHSPS45R TS 275 440 25
IF HHS Steel CHSP35E TS 167 340 32
CHSP40E TS 206 390 27
CHSP45E TS 245 440 27
Dual Phase CHSP60DP TS 450 Max 590 24

Tolerances

Thickness Tolerance

Thickness/Width 800≤w<1,000 1,000≤w<1,250 1,250≤w<1,600 1,600≤w≤1,800
0.30≤t<0.40 ±0.040 ±0.040 - -
0.40≤t<0.60 ±0.050 ±0.050 ±0.060 -
0.60≤t<0.80 ±0.060 ±0.060 ±0.060 ±0.070
0.80≤t<1.00 ±0.060 ±0.070 ±0.080 ±0.090
1.00≤t<1.25 ±0.070 ±0.080 ±0.090 ±0.110
1.25≤t<1.60 ±0.090 ±0.100 ±0.110 ±0.130
1.60≤t<2.00 ±0.110 ±0.120 ±0.130 ±0.150
2.00≤t≤2.30 ±0.130 ±0.140 ±0.150 ±0.170

Width Tolerance

POSCO Specification, KS, JIS Specifications

(Unit : mm)

Thickness/Width Width Tolerances Using Cold Rolled Steel Sheet
Mill Edge Under 1,250 +7,0
1,250 and Over +10,0
Slit Edge Under 1,250 +3,0
1,250 and Over +4,0

Flatness

(Unit : mm)

Classification Wave Edge Wave Center Wave
Width
Under 1,000 2 2 2
1,000 and over and under 1,250 3 2 2
1,250 and over and under 1,600 4 3 3
1,600 and over 5 4 4

Notes :

1. Flatness is measured on a flat table as side drawing. Flatness which is applicable to upper side of the steel is the value except thickness of the steel is the value from the maximum value of transformation.

Available Dimensions

Surface Finish and Oiling

Surface Finish

Classification Specification
Dull Finish Dull finish, which is attained by attaching numerous fine grains
onto the steel surface, is often called 'pear-skin finish' or 'egg-shell texture'.
The grains are made by electro discharge texturing machine. The
dull finish is usefull in drawing because lubricant oil can be
evenly spread over the entire surface, thereby reducing the
possibility of friction. The fine grains also help to boost paint
adherence and extend the steel life span of the steel.
Dull Finish Ra (μm)
E3 E5 E7 E9
1.50~2.50 1.00~1.80 0.70~1.30 0.40~0.80

Oiling

It is recommended that customers use product promptly to avoid the possibilities of rusting during storage or shipment Customer can choose kind of oil and quantity. Oiling improves corrosion resistance but cannot be the perfect way to protect steel from rust. Also, non-oiled and DOS oiled products are easy to rusting so, POSCO Maharashtra strongly recommends to apply general oil and use the product as soon as possible.

DuClassification Quantity (Mg/m²) (Both Sides)
Heavy 3,000~4,500
General 1,800~3,000
Light 800~1,800
Thin 200~800
DOS - D 50~100
DOS - S 20~50
DOS - U 10~20

Commercial Steel

Used for General Purposes In
Manufacturing such as

  • Refrigerator
  • Drums / Tubes
  • Furniture

Structural Steel

Structural Steel does not need drawability
but requires high strength like

  • Structure
  • Steel Furniture

High Tensile Strength Steel

Used where high strength with good
formability is required

  • Automobile Seats, Parking brackets
  • Center floors and Brackets, Frames
  • Fender and Hood

Extra Deep Drawing Steel

Used where deep drawing quality
is required

  • Automobiles components & Body Panels
  • Fuel Tanks
  • Components for Building