AISI L6 | 1.2714 | SKT4 2018-11-06T12:16:22+00:00

Project Description

AISI L6 hot work tool steel Manufacturer and Exporter,supplied with round,square,flat,block,and shaft etc. AISI L6 is  defined as Cr-Ni-Mo alloyed hot work tool steel as per ASTM A681.it is equivalent with Germany grade 1.2714/55NiCrMoV7.AISI L6 has good resistance to thermal shock and heat cracking,good mechanical characteristics and toughness in hot and cold conditions,good resistance to the tempering.It is normally supply in hardened, quenched & tempered condition, and also in annealed condition in special case.AISI L6 Steel can maintain hardness above 60 HRC for sections of 75 mm (3 in.) thickness.AISI L6|1.2714 hot work tool steel

1.Supply Form & Size & Tolerance

Supply FormSize(mm)ProcessTolerance



Round
Φ6-Φ100Cold DrawnBright/Black Best H11

Φ16-Φ350

Hot Rolled
Black-0/+1mm
Peeled/ground Best H11

Φ90-Φ1000

Hot Forged
Black-0/+5mm
Rough Turned-0/+3mm

Flat/Square/Block
Thickness :120-800
Hot Forged
Black-0/+8mm
Width:120-1500
Rough Machined-0/+3mm

Remark:Tolerance can be customized as per requests

2.Chemical Composition

StandardGradeCSiMnPSCrNiMoV
ASTM A681L60.65-0.750.1-0.50.25-0.800.030.030.6-1.21.25-2.00.50

DIN EN ISO 4957
1.2714
0.50-0.60

0.1-0.4

0.60-0.90

0.03

0.02

0.8-1.2

1.50-1.8

0.35-0.55

0.05-0.15
55NiCrMoV7
JIS G4404SKT40.50-0.600.1-0.40.60-0.900.030.020.8-1.21.50-1.80.35-0.550.05-0.15

3.Physical Property

Density,kg/dm37.8
Specific heat capacity,J/g.K0.46
Thermal conductivity ,W/m.K35.9
Specific electric resist,Ohm mm2/m0.3
Electrical conductivity,m/mm23.33
Modulus of elasticity long.,Gpa215
Modulus of elasticity tang.,Gpa82

4.Thermal Property

Temperature,°C20-10020-20020-30020-40020-50020-60020-700
Thermal expansion,10^-6 m/(m*K)12.513.113.413.91414.314.5
Temperature,°C20350700
Thermal Conductivity,W/(m*K)353936

5. Mechanical Property



Quenching at
860 °C in oil
Tempering 100°C150°C200°C250°C300°C350°C400°C450°C500°C550°C600°C650°C
HB634615595577543512482468442409390
HRC5958575654525049474442
R,N/mm 2 24202330224021602010188017601700158014301340


Quenching at
860 °C in air
Tempering 100°C150°C200°C250°C300°C350°C400°C450°C500°C550°C600°C650°C
HB560512482442421400371336301
HRC555250474543403632
R,N/mm 2 207018801760158014801390125011101010

6.Forging

Heat the temperature to 750 oC – 800 oC ,hold for suitable time,then heat the temperature up to 1050oC,hold enough time for the steel to be thoroughly heated.Don’t forge below 850oC.AISI L6 steel  should be cooled as slowly as possible in the furnance.Annealing is strongly recommended after forged.

7.Annealing

Annealing must be performed after hot working and before re-hardening.Heat the temperature to740- 760°C with a rate not exceeding 220°C per hour , and hold at temperature for 1 hour per inch (25.4mm) of maximum thickness; 2 hours minimum. Then cool slowly with the furnace at a rate not exceeding 20°C per hour to 500°C. Continue cooling to ambient temperature in the furnace or in air. The resultant hardness should be a maximum of 235 HBW.

8.Hardening

Prheat uniformly to  the temperature 650-700°C ,Quench in air with hardening temperature 870-900°C,or quench in oil with with hardening temperature 830-870°C,tempering should be followed as soon as possible.

9.Tempering

Heat uniformly to the required temperature allowing a soaking time of two hours per 25mm of ruling section. Withdraw from the furnace and allow to cool in air. A second tempering is highly recommended, the tool being allowed to cool to room temperature between tempers.

Temperature ,°C200250300400500
Hardness , HRC5554534945

10.Application

AISI L6 is highly recommendable for Close Die Forgings due to its characteristics of high wear-resistance, extra toughness , high hardness which is achieved with Cr-Ni-Mo-V high graded alloys.

Typical applications includes Arbors, blanking dies, clutch parts, forming dies,disc saws, drift pins, brake dies, hand stamps,hubs, lead and feed screws, machine parts,punches, pawls, pinions, shear blades, spindles,spring collets, swages and etc.

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