hotrolled by porjai naja

Hot Rolled Steel

CONTENTS Manufacturing Facilities Production Facilities Manufacturing Process Main Uses POSCO Specifications Available Dimensions Packing & Marking Ordering Appendix

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With its excellent facilities and extensive experiences, POSCO has been actively pursuing research and technology development for the production of diverse, high-quality hot rolled steel products that meet not only POSCO specifications but also KS, JIS and other international specifications. New products are continuously being developed. POSCO hot rolled steel products are widely used in automobiles, construction materials, pipes, and electrical home appliances, the superiority has been demonstrated. POSCO exerts ongoing efforts to give consistently superior quality and service to its valued customers.

HOT ROLLED STEEL

POSCOâ&#x20AC;&#x2122;s hot rolled coil is produced by ultra-modern facilities and advanced technologies. Quality is strictly controlled to meet customer requirements. To improve product quality, a comprehensive network of computers controls the entire manufacturing processes and monitors the main areas relating to product quality.

MANUFACTURING FACILITIES

04 HOT ROLLED STEEL

M A N U F A C T U R I N G

F A C I L I T I E S

Reheating Furnace

Roughing Mill

Finishing Rolling

Run-Out Table

Skin Pass Rolling Process

The slabs, which are transferred from a continuous casting plant, are heated enough in a reheating furnace, first, and then, they are extracted in order to be used for the steel rolling works finally. In order to remove the thick scales on the surface of a hot slab, some VSBs (Vertical Scale Breakers) are being run after being installed.

In this process, slabs with surface scale already removed are made into rolling materials with proper shape, thickness and width. In the entry and exit area of the roughing mill, the edger rolls the strip in the width direction using the automatic width control (AWC) system.

The purpose of a finishing rolling is to adjust the thickness and width of a coil to the specified sizes and to roll it to have a smooth surface and shape at a desired finishing temperature appropriate to its usages. The up-to-date equipments, such as Work Roll Shift Mills, On-line Roll Grinders (ORGs), etc., are contributing to the enhancement of the productivity and the quality of the coils by controlling the crowns.

After the finishing mill, the strip passes to the run-out table where it is then coiled. While being rolled along the table, the strip is sprayed with water to cool it to the proper temperature suitable for coiling.

During the skin pass rolling process, various kinds of inspections, such as the surface defect and dimension measuring, etc., are conducted in order to improve the shapes, mechanical behaviors and surface profiles of a product.

HOT ROLLED STEEL

PRODUCTION FACILITIES

P R O D U C T I O N

Facility

Classification

Pohang Works No.1 Hot Strip Mill

Pohang Works No.2 Hot Strip Mill

Gwangyang Works No.1 Hot Strip Mill

Gwangyang Works No.2 Hot Strip Mill

Gwangyang Works No.3 Hot Strip Mill

Reheating Furnace

Capacity

200T/Hx2, 240T/H

250T/H x 4

325T/H x 3

270T/H x 3

Scale Breaker

Roughing Mill

Finishing Mill

Down Coiler

SKINPASS MILL

06 HOT ROLLED STEEL

TYPE

F A C I L I T I E S

AWC

Pair Cross Mill

Automatic Width Control (ASC) System:

Pair Cross Mill

An AWC System, which is attached to the roll of a skin pass rolling mill, automatically adjusts the width of a coil by using the highly-sensitive hydraulic cylinder while monitoring the result width of a coil.

The shape and crown of a coil is adjusted by the paired upper and lower rolls crossing each other.

ASC

AGC

Automatic Shape Control (ASC) System

Automatic Gauge Control (AGC) System

An ASC (Automatic Shape Control) System, which is attached at the end of a finishing mill, adjusts the flatness of a coil. After that, the ASC System automatically adjusts the pressure of the roll bender to control a strip shape.

An AGC System, which is attached to the end of a finishing mill, automatically adjusts the thickness of a coil by using the highlysensitive hydraulic cylinder while monitoring the result thickness of a coil.

Walking beam Type Walking beam Type Walking beam Type Walking beam Type Walking beam Type

TYPE

Horizontal

Vertical

TYPE

R1: 2-High Reverse R2: 4-High Reverse

R1: 2High Non-Reverse R2: 4-High Reverse R3: 4-High Non-Reverse R4: 4-High Reverse

R1: 2-High Reverse R2: 4-High Reverse R3: 4-High Non-Reverse

R1: 2-High Reverse R2: 4-High Reverse

TYPE

4-High Non-Reverse

Number of Stand

Quantity

Thickness

1.2~12.7mm

1.2~22mm

Max. Weight

18MT

35MT

Thickness

1.2~6.7mm

1.2~6.4mm

Width

700~1,270mm

600~1,880mm

700~1,650mm

700~1,570mm

700~1,950mm

Max. Weight

18MT

35MT

Inside Diameter

762mm

610,762mm

HOT ROLLED STEEL

MANUFACTURING PROCESS

08 HOT ROLLED STEEL

M A N U F A C T U R I N G

P R O C E S S

HOT ROLLED STEEL

MAIN USES

M A I N

U S E S

The usage presented in this section reflects the general use and shall be used as a reference. Please be sure to consult with our associates when making orders for specific usage.

Steel for Structural Uses

Carbon Steel for Pipe and Tube

Hot-Rolled Carbon Steel for Special Use

Steel for general and welding structures are produced and are used for building iron structures and the structures of bridges, ships and cars, etc.

This type of steel, excellent in weldability and formability, is widely used in structural pipes, general pipes, special pipes, and machine-structural carbon steel pipe.

This steel type includes carbon steel for general machinery, alloy steel, and tool steel. After the heat treatment process, the steel is used in a variety of machine parts.

∙KS

∙POSCO ∙JIS

∙JIS

∙ASTM ∙ BS ∙DIN

SS330, 400, SM400A, B, C, SM490A, B, SS330, SS400, SS490, SS540 SM400A, B, C, SM490A, B, C SM490YA, YB, SM520B, C, SM570 A36, A283, A570 BS1449 PART 1 50/35HR, HS, BS4360, 40B, 43A,B,C, 50B,C DIN17100 ST22, ST33, ST37-2, ST44-2, ST52-3

Weather Resistant Steel This type of steel with enhanced corrosion and atmospheric corrosion resistant properties through the addition of such special elements as P, Cu, and Cr is used in manufacturing containers, special automobiles and construction structures.

∙POSCO ∙JIS

PAWS50 SPA-H

Steel for automotive Structural Uses The type of high strength steel which has extremely excellent drawability and weldability is used in automobile frames, members and wheels.

∙POSCO ∙JIS ∙ASTM

ATOS55, 60, 80 AUTOBEAM, STAB SPA-H310, 370, 400, 440, SPFH490, 540, 590 A715-40, 45, 50, 55, 60, 65, 70, 80

∙SAE ∙DIN

S10C-S55C, SK2, 3, 4, 5, 7 SUP9, SCM415, 430, 435, 440 SAE1010~1055 50CRV4, 75CR1

Hot-Rolled Steel for Gas Cylinders Cold Rolled Steel This steel, which has high strength qualities and good formability, is used in high pressure gas containers, with less than a 500ℓ inner capacity, used for holding LPG, acetylene and other high pressure gases. .

∙JIS ∙ASTM

SG255, 295, 325, 365 A455

This cold rolled steel is used in many cold rolled products, such as CR, GI and color plates.

∙SAE

SAE1006~1055

Steel for Oil Well Pipes This type of steel, characterized by strict high strength qualities, extremely low temperature toughness, excellent weldability and fracture resistance, is used for drilling in severely cold areas and for deep sea oil wells.

∙API

5G-J55, K55, N80

Steel for Pipelines Because of its excellent high strength qualities, extremely low temperature toughness, hydrogen induced crack resistance and good weldability, this steel is used in pipelines.

∙API 5L

10 HOT ROLLED STEEL

PACOS2,3, POSP290A~POSP540A SPHT1, 2, 3, 4, STB340, 410, STK290, 400, 490, 500, 540, STKM11A, 12B, 13A, 13B, 14B, 16A, 18A

5L-A,B, X42,X46,X52,X60,X65,X70,X80

HOT ROLLED STEEL

S P E C I F I C A T I O N S

POSCO SPECIFICATIONS

The product standards are subject to change. Please be sure to confirm the recent standards when making orders or to consult our associates.

Hot Rolled Steel Sheets & Strips for Deep Drawing : These specifications are applied to the hot-rolled steel strips for cold-rolled deep drawing that are manufactured by POSCO. Chemical Composition(wt %)

Specifications

Thickness (mm)

Sol-Al

기타

POSHRD2

1.8~7.0

≤ 0.03

≤ 0.25

≤ 0.02

≤ 0.06

POSHRD25

2.0~7.0

≤ 0.005

≤ 0.03

≤ 0.20

≤ 0.02

≤ 0.06

Ti 0.005~0.05 Nb 0.005~0.04

POSHRD3

2.0~7.0

≤ 0.005

≤ 0.03

≤ 0.20

≤ 0.02

≤ 0.06

Ti 0.01~0.06

Notes: 1. External appearance, form, dimension, weight and allowances comply with SAE.

2. This specification guarantees chemical composition without mechanical properties.

Acid Sulfuric Corrosion Resistance and Weather Resistance High Strength Steel Sheets & Strips: These specifications are applied to the acid sulfuric corrosion resistance and weather resistance hot-rolled high-strength steel sheets and strips that are manufactured by POSCO. Thickness (mm)

Specifications ANCOR-H (Acid Sulfuric Corrosion Resistant Steel)

HICON700W (Weather Resistant High Strength Steel)

Chemical Composition(wt %) C

Yield Point (MPa)

Tensile Strength (MPa)

Elongation

Bending Test

Test Piece

Others

ANCOR-H

≥ 245

≥ 400

No.5 Rolling Direction

≥ 25

HICON700W

≥ 700

750~950

No.5 Rolling Direction

≥ 12

1.6~12.7

≤ 0.10

≤ 0.50

≤ 0.80

≤ 0.035

Cu ≤ 0.50 Cr ≤ 0.50

2.3~6.5

≤ 0.12

≤ 0.45

≤ 2.50

≤ 0.035

≤ 0.01

Cu ≤ 0.55 Cr ≤ 1.20

Notes: 1. External appearance, form, dimension, weight and allowances comply with SAE.

Specifications

Bending Angle

Inner Dia.

Test Piece/Direction

180˚

1.5t

JIS No1. Perpendicular to Rolling Direction

90˚

1.0t

JIS No1. Perpendicular to Rolling Direction

2. This specification guarantees chemical composition without mechanical properties.

Hot Rolled Steel Sheets & Strips for Steel Pipes with Anti-grooving Corrosion : These specifications are applied to the hot rolled steel strips with anti-grooving corrosion that are manufactured by POSCO. Chemical Composition(wt %)

Specifications

Thickness (mm)

Others

PACOS2

1.6~12.71

≤ 0.18

≤ 0.35

0.25~0.60

≤ 0.023

≤ 0.005

PACOS3

3.0~10.0

≤ 0.18

≤ 0.35

0.60~1.00

≤ 0.023

≤ 0.005

Elongation(%), Thickness(mm)

Bending Test

Specifications

Yield Point (MPa)

1.2~1.6

1.6~3.0

3.0~6.0

6.0~13.0

Test Piece

under 3.0

3.0 and over

CU 0.10~0.30 CA ≥ 0.001

PACOS2

≥ 344

≥ 27

≥ 30

≥ 32

No.5 Rolling Direction

1.0t

1.5t

CU 0.10~0.30 CA ≥ 0.001

PACOS3

≥ 410

≥ 22

≥ 25

≥ 27

No.5 Rolling Direction

1.5t

2.0t

Notes: 1. External appearance, form, dimension, weight and allowances comply with JIS G 3193(ANCOR-H), JIS G 3134(HICON700W). 2. Number of tension test pieces and bend test pieces: one pieces each of the same molten steel and same thickness. However, in excess of 50 ton, two pieces of each. 3. Bending test piece: JIS No.4, rolling direction.

Hot Rolled Steel Sheets & Strips : These specifications are applied to the hot rolled steel sheets and strips for automotive structures that are manufactured by POSCO. Chemical Composition(wt %)

Tensile Test

Thickness (mm)

ATOS55

2.3~12.7

≤ 0.20

≤ 0.40

≤ 1.50

≤ 0.03

≤ 0.05

ATOS60 ATOS80

2.3~12.7

≤ 0.20

≤ 0.40

≤ 1.50

≤ 0.03

≤ 0.05

2.3~12.7

≤ 0.20

≤ 0.40

≤ 2.00

≤ 0.03

Specifications

Bending Test

Elongation(%), Thickness(mm) *Rolling Direction

Yield Point (MPa)

Tensile Strength (MPa)

ATOS55

≥ 540

≥ 400

≥ 20

≥ 21

≥ 14

ATOS60 ATOS80

≥ 590

≥ 440

≥ 19

≥ 20

≥ 13

≥ 780

≥ 700

≥ 14

≥9

Specifications

No.5 Test Piece, No.5 Test Piece, 2.5~5.0 5.0~6.3

No.1 Test Piece, 6.3~12.7

Inner Dia.

Test Piece (JIS No.3)

180�

1.5t

Perpendicular to Rolling Direction

180�

1.5t

Perpendicular to Rolling Direction

180�

1.5t

Perpendicular to Rolling Direction

Bending Angle

Hot Rolled Steel Sheets & Strips for the Impact Beams and Stabilizers of Automobiles : These specifications are applied to the hot rolled steels strips for the impact beams and stabilizers of automobiles that are manufactured by POSCO. Chemical Composition(wt %)

Specifications

Thickness (mm)

AUTOBEAM

1.6~7.0

≤ 0.30

STAB

1.6~7.0

≤ 0.30

≤ 0.25

Sol-Al

Bending Test

Specifications

Yield Point (MPa)

Bending Angle

Inner Dia.

≤ 1.50

≤ 0.005

≤ 0.12

0.10~0.30

AUTOBEAM

490~784

180˚

1.5t

≤ 1.00

≤ 0.025

≤ 0.015

≤ 0.10

0.20~0.40

0.001~0.005

STAB

180˚

1.5t

Remark Steel pass through proper heat treatment to come out as finished products

Notes: 1. External appearance, form, dimension, weight and allowances comply with KS D 3555(AUTOBEAM), JIS G3193 (STAB). 2. Number of tension test pieces and bend test pieces: one pieces each of the same molten steel and same thickness. However, in excess of 50 ton, two pieces of each. 3. Bending test piece: JIS No.3 rolling direction.

12 HOT ROLLED STEEL

HOT ROLLED STEEL

AVAILABLE DIMENSIONS

A V A I L A B L E

D I M E N S I O N S

The available sizes are subject to change. Please consult with the POSCO contact person before ordering.

Hot Rolled Steel Coil TS 30Kg Class

TS 40Kg Class

TS 80Kg Class

Checkered Coil(TS 30kg Class)

1,500

Developing Range

1,400

1,300

1270

1,200

1,100

1,000

900

800

8.0

3.0 700

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

P/O Coil TS 50Kg Class

14 HOT ROLLED STEEL

TS 60Kg Class

HOT ROLLED STEEL

PACKING & MARKING

HR COIL

P A C K I N G

M A R K I N G

Nude Packing Choose either nude or paper packing.

Metal Band

■ Coil

■ Sheet

Buckle Marking Label Product label

Product label

Marking Label

P/O COIL Metal Packing Choose either paper packing or metal packing.

Metal Protective Ring Metal Band

■ Product label

Waterproof Wrapping Paper Metal Sheet

Buckle

Rust-Proof Paper Metal Sheet

HR SHEET Choose from nude packing, skid-nude packing, paper packing, skid-papering packing, and skid-metal packing.

Waterproof Wrapping Paper

�Marking labels are attached when requested by customers.

Metal Packing Skid

16 HOT ROLLED STEEL

HOT ROLLED STEEL

O R D E R I N G

ORDERING

I N F O R M A T I O N

If you want to order POSCO hot rolled steel products, please provide us with the following information in detail, which will help us to manufacture the optimal quality product you need.

For more information, please contact us at the addresses given below. Seoul Office : POSCO Center, #892, Daechi 4-dong, Gangnam-gu, Seoul 135-777, Korea Tel: +82-2-3457-0114 Internet Homepage : www.posco.com www.steel-n.com

18 HOT ROLLED STEEL

APPENDIX

CONVERSION FACTORS

■ Weight

■ Leaner Measure

■ Force

■ Force Per Unit Area

■ Energy

20 HOT ROLLED STEEL

HOT ROLLED STEEL

CONVERSION FACTORS

■ Width-Weight Curves for Coils (Coil ID=30Inch)

■ Weight The weight tables on the following pages show calculated weights of steel products, which thickness, width and length are specified by inch and foot. Calculation is done on the basis of the basic weights show below. Calculation methods for area, weight per unit area are in accordance with KS D3500.

Coil Weight (MT)

Outer Diameter (mm)

Coil Width(mm)

■ Weight Table

22 HOT ROLLED STEEL

(unit:mm)

HOT ROLLED STEEL

The whole area of a village gets full of joys even only with some small grains! In a small village, Manyara of Tanjania, having been clam, the whole village is hustling and bustling, today, thanks to only one popping machine from an unknown country. A child having a bawl full of corns and another having no grains feel the same flutter in their hearts. ‘Pop!’And then, the empty bawl of a child with no grains is also filled up with pop corns.

For more information, please contact us at the addresses given below.

At the very moment when all the children’s bawls are full of white happiness evenly, smiles brighter than anyone’s over the world settle down on everyone’s face in the village.

We, only together, can move the world. Seoul Office : POSCO Center, #892, Daechi 4-dong, Gangnam-gu, Seoul 135-777, Korea. Tel: +82-2-3457-0114 Internet Homepage : www.posco.com www.steel-n.com