AISI L6 /DIN 1.2714 /JIS Skt4 Tool Steel Bar

• Type: Alloy Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Technique: Forged
• Application: Structural Steel Bar, Tool Steel Bar
• Surface Treatment: Polished
• Alloy: Alloy
• Model NO.: KM-143
• Special Use: Mold Steel, Cold Heading Steel
• Size: 130mm-1000mm (Optional)
• Length: 2m,3m,5.8m, 6m, 8m or as Required.
• Delivery Time: 7-30 Days
• Loading Port: Shanghai
• MOQ: 3 Tons
• Certificate: ISO, BV, SGS, Mill Test Certificate
• Packaging Detail: Standard Sea-Worthy Package
• Surface: Bright, Black
• Price Term: Ex-Work, Fob, CFR, CIF, etc.
• Specifications: Flat Bar, Round Bar, Angle Bar, Square Bar
• Transport Package: Standard Sea-Worthy Package
• Specification: 130mm-1000mm (optional)
• Trademark: Kingmetal
• Origin: China (Mainland)
• Production Capacity: 800tons/Month

Product Description

AISI L6 /DIN 1.2714 /JIS SKT4 tool steel bar
 

1.Supply Form & Size & Tolerance

Supply Form	Size(mm)	Process	Tolerance
Round	Φ6-Φ100	Cold Drawn	Bright/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

Standard	Grade	C	Si	Mn	P	S	Cr	Ni	Mo	V
ASTM A681	L6	0.65-0.75	0.1-0.5	0.25-0.80	0.03	0.03	0.6-1.2	1.25-2.0	0.50	-
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 G4404	SKT4	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

3.Physical Property

Density,kg/dm3	7.8
Specific heat capacity,J/g.K	0.46
Thermal conductivity ,W/m.K	35.9
Specific electric resist,Ohm mm2/m	0.3
Electrical conductivity,m/mm2	3.33
Modulus of elasticity long.,Gpa	215
Modulus of elasticity tang.,Gpa	82

4.Thermal Property

Temperature,°C	20-100	20-200	20-300	20-400	20-500	20-600	20-700
Thermal expansion,10^-6 m/(m*K)	12.5	13.1	13.4	13.9	14	14.3	14.5
Temperature,°C	20		350		700
Thermal Conductivity,W/(m*K)	35		39		36

5. Mechanical Property

Quenching at 860 °C in oil	Tempering	100°C	150°C	200°C	250°C	300°C	350°C	400°C	450°C	500°C	550°C	600°C	650°C
	HB	634	615	595	577	543	512	482	468	442	409	390	-
	HRC	59	58	57	56	54	52	50	49	47	44	42	-
	R,N/mm 2	2420	2330	2240	2160	2010	1880	1760	1700	1580	1430	1340	-
Quenching at 860 °C in air	Tempering	100°C	150°C	200°C	250°C	300°C	350°C	400°C	450°C	500°C	550°C	600°C	650°C
	HB	560	-	512	-	482	-	442	421	400	371	336	301
	HRC	55	-	52	-	50	-	47	45	43	40	36	32
	R,N/mm 2	2070	-	1880	-	1760	-	1580	1480	1390	1250	1110	1010

6.Forging

Heat the temperature to 750 ^oC - 800 ^oC ,hold for suitable time,then heat the temperature up to 1050^oC,hold enough time for the steel to be thoroughly heated.Don't forge below 850^oC.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 ,°C	200	250	300	400	500
Hardness , HRC	55	54	53	49	45

 

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.