EH500LEAbrasion Resistant Steel Plate

Manufacturer’s Testing

total quality total service Total Steel

TECHNICAL BULLETIN 7

CONTENTS I Specification

1 Manufacturing Process and Available Thickness......................................................1

2 Chemical Composition.................................................................................................1

3 Mechanical Properties..................................................................................................1

II Test Results

1 Steel Plates Tested

1-1 ChemicalComposition............................................................................................2

2 Properties of Base Plates

2-1 Microstructure.........................................................................................................3

2-2 TensileTest.............................................................................................................7

2-3 CharpyImpactTest.................................................................................................7

2-4 HardnessDistributioninThicknessDirection..........................................................8

2-5 BrinellHardnessTest..............................................................................................9

2-6 BendingTest...........................................................................................................9

3 Weldability

3-1 MaximumHardnessTest.......................................................................................10

3-2 y-GrooveCrackingTest.........................................................................................11

4 Mechanical Properties of Welded Joints

4-1 WeldingConditions...............................................................................................13

4-2 Macrostructure......................................................................................................14

4-3 HardnessDistributioninWeldedJoint..................................................................15

4-4 SideBendTestWeldedJoint................................................................................16

4-5 CharpyImpactTestWeldedJoints........................................................................18

– 1 –

I SPECIFICATION

1. Manufacturing Process and Available Thicknesses

Grade Thickness Heat TreatmentJFE-EH500LE 6~32mm Controlledheattreatment

2. Chemical Composition

ThicknessChemical composition (wt.%)

C Si Mn P S Cr Mo Ti B Ceq (LR)

~19mm0.29max

0.55max

1.60max

0.020max

0.010max

0.40max

0.35max

0.02max

0.004max

0.55max

19.1~32mm

0.58max

Ceq(LR)=C+Mn/6+Cu/15+Ni/15+Cr/5+Mo/5+V/5

3. Mechanical Properties

Brinell hardness(3000 kgf)

Charpy impact properties Absorbed energy at -40°C(J)

(Average of 3 tests)477~556 21min

Impactpropertiesareguaranteedfortheplateofthethicknessnotlessthan12mminlongitudinaldirectionunlessotherwisespecified.

– 2 –

II TEST RESULTS

1. Steel Plates Tested

1-1 Chemical Composition

Table1:LadleAnalysis(wt.%)

C Si Mn P S Cr Mo Ti B Ceq (LR) PCM

0.26 0.31 1.33 0.007 0.002 0.10 0.13 0.01 0.0011 0.53 0.36

SmallamountofothermicroalloyingelementsareaddedCeq(LR)=C+Mn/6+Cu/15+Ni/15+Cr/5+Mo/5+V/5

PCM=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B

Table2:ProductAnalysis(wt.%)

Thickness (mm) C Si Mn P S Cr Mo Ti B

Ceq (LR) PCM

12 0.26 0.31 1.32 0.006 0.002 0.10 0.13 0.01 0.0012 0.52 0.35

20 0.26 0.32 1.34 0.006 0.002 0.10 0.13 0.01 0.0012 0.53 0.36

25 0.26 0.32 1.34 0.006 0.002 0.10 0.13 0.01 0.0012 0.53 0.36

32 0.27 0.32 1.38 0.008 0.002 0.10 0.14 0.01 0.0012 0.54 0.36

SmallamountofothermicroalloyingelementsareaddedCeq(LR)=C+Mn/6+Cu/15+Ni/15+Cr/5+Mo/5+V/5

PCM=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B

2. Properties of base plates

2-1 Microstructure

x200 x400

Surface

1/4t

1/2t

Photo1:Microstructure(t=12mm)

– 3 –

100µm 50µm

– 4 –

x200 x400

Surface

1/4t

1/2t

Photo2:Microstructure(t=20mm)

100µm 50µm

x200 x400

Surface

1/4t

1/2t

Photo3:Microstructure(t=25mm)

100µm 50µm

– 5 –

x200 x400

Surface

1/4t

1/2t

Photo4:Microstructure(t=32mm)

100µm 50µm

– 6 –

2-2 Tensile Test

Table3:ResultsofTensileTest

Thickness (mm)

Specimen Position DirectionYS or

0.2%PS(N/mm2)

TS

(N/mm2)

EI

(%)

12 JISNo.5 FullThickness C 1317 1715 15

20 JISNo.5 FullThickness C 1203 1681 17

JISNo.4 1/2t C 1280 1653 12

25 JISNo.5 FullThickness C 1240 1672 18

JISNo.4 1/2t C 1193 1632 11

32 JISNo.5 FullThickness C 1314 1556 22

JISNo.4 1/4t C 1320 1516 12

JISNo.4 1/2t C 1298 1465 12

JISNo.5:25mmwidthx50mmGLJISNo.4:14mmdiameterx50mmGL

2-3 Charpy Impact Test

Table4:ResultsofCharpyImpactTest

Thickness (mm)

Specimen DirectionAbsorbed energy at -40°C (J)

Each. Ave.

12 2mmV-Notched L 43 43 33 40

20 2mmV-Notched L 45 36 46 42

25 2mmV-Notched L 42 35 43 40

32 2mmV-Notched L 34 30 31 32

Spec. L – ≥ 21

– 7 –

2-4 Hardness Distribution in Thickness Direction

– 8 –

Figure1:HardnessDistributioninThicknessDirection

2-5 Brinell Hardness Test

Table5:ResultsofBrinellHardnessTest

Thickness (mm)

Each Ave.

12 504,507,504,501,498 503

20 501,495,501,507,504 502

25 507,492,495,501,510 501

32 492,488,510,513,511 503

Spec. – 477~556

2-6 Bending Test

Table6:ResultsofBendingTest

Thickness (mm)

Direction

Specimen*Bending radius (t : thickness of

specimen)

No.Width (mm)

2.5 t 2.0 t 1.5 t 1.0 t

12L

JISNo.1 50

❍ ❍ × –

C ❍ × × –

20L ❍ ❍ × –

C ❍ ❍ × –

25L ❍ ❍ × –

C ❍ ❍ × –

32L ❍ ❍ ❍ ×

C ❍ ❍ ❍ ×

– 9 –

*Totalthickness❍ :Nocracking×:Cracks

3. Weldability

3-1 Maximum Hardness Test

Figure2:TestConditions

Table7:WeldingConditions

Welding method SMAW

Thickness 20mm

Welding material LB-624.0mmØ(KOBELCO)

Welding conditions 170A–25V–15cm/min

Welding heat input 17kJ/cm

Preheating temperature 25°C,50°C,100°C

Table8:ResultsofMaximumHardnessTest

Preheat temperature

25°C 50°C 100°C

Maximumhardness(HV10)

487 478 457

– 10 –

Specimen

Hardnessmeasuring

position

Table10:WeldingConditions

Welding method SMAW GMAWCO2100%)

Thickness 20mm 20mm

Welding materialLB-624.0mmØ(KOBELCO)

MG-501.2mmØ(KOBELCO)

Welding conditions 170A–25V–15cm/min 240A–30V–25cm/min

Welding heat input 17kJ/cm 17kJ/cm

Preheating temperature 100°C,125°C,150°C 50°C,75°C,100°C

3-2 y-Groove Cracking Test

Figure3:SpecimenConfiguration

– 11 –

Table11:Resultsofy-GrooveCrackingTest

Thickness(mm)

Welding methodPreheat Temperature to

Prevent from Cracking (°C)

20SMAW 125

GMAW 75

Figure4:Resultsofy-GrooveCrackingTest

– 12 –

– 13 –

Table16:WeldingConditions(SMAW)

Welding method SMAW

Thickness 20mm

Welding materials LB-624.0mmØ(KOBELCO)

Preheat temperature 125°C

Inter-pass temperature ≤ 250°C

Pass 1Pass OtherPass

Welding current 170A 170A

Arc voltage 25V 25V

Welding speed 15cm/min 12cm/min

Heat input 17.0kJ/cm 21.3kJ/cm

Table17:WeldingConditions(GMAW)

Welding method GMAW(CO2100%)

Thickness 20mm

Welding materials MG-501.2mmØ(KOBELCO)

Preheat temperature 75°C

Inter-pass temperature ≤ 250°C

Pass 1Pass OtherPass

Welding current 220~240A 220~240A

Arc voltage 30V 30V

Welding speed 25cm/min 20cm/min

Heat input 15.8~17.3kJ/cm 19.8~21.6kJ/cm

4. Mechanical Properties of Welded Joints

4-1 Welding Conditions

Figure7:EdgePreparation

4-2 Macrostructure

(a)SMAW

Photo5:Macrostructure

(b)GMAW

– 14 –

4-3 Hardness Distribution in Welded Joint

(a)SMAW

Figure8:HardnessDistributioninWeldedJoint

(b)GMAW

– 15 –

4-4 Side Bend Test of Welded Joint

Photo6:ResultsofSideBendTest(SMAW)

BendingRadius:20mmBendingTestResults:Good

– 16 –

Photo7:ResultsofSideBendTest(GMAW)

BendingRadius:20mmBendingTestResults:Good

– 17 –

– 18 –

4-5 Charpy Impact Test of Welded Joints

Figure9:SamplingPositionofTestSpecimens

Table18:ResultsofCharpyImpactTest(SMAW)

Notch position

Absorbed EnergyTest

temperature (°C)

Each (J)

Ave (J)

Test temperature

(°C)

Each (J)

Ave (J)

WM 0122121126

123 -40427569

62

FL 0124162138

141 -408410468

85

HAZ 0167187162

172 -4013511489

113

WM:WeldMetal

FL:FusionLine

HAZ:HeatAffectedZone

Table19:ResultsofCharpyImpactTest(GMAW)

Notch position

Absorbed EnergyTest

temperature (°C)

Each (J)

Ave (J)

Test temperature

(°C)

Each (J)

Ave (J)

WM 0136119121

125 -40496235

49

FL 0160157143

153 -40504052

47

HAZ 0180181179

180 -40179185138

167

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ModifiedfromTECNo.C1E-T033-00200312DB

TS

A5

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3/07