Mat.No. 1.6587, DIN 17CrNiMo6, AISI 4820

Mat.No. 1.6587, DIN 17CrNiMo6, AISI 4820

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Designation by Standards Brand Name Ravne No. Mat. No. DIN EN AISI CT781 781 1.6587 17CrNiMo6 17CrNiMo7 4820 Chemical Composition (in weight %) C Si Mn Cr Mo Ni V W Others 0.18 max.0.40 0.70 1.65 0.30 1.55 - - - DescriptionNickel-molybdenum alloy steel. Alloyed case hardening steel for heavy and high strained gear parts with high demands on toughness at core tensile strength of 1050-1350 N/mm2. ApplicationsSeverely stressed components for mechanical engineering and automobile ...


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Designation by Standards

Brand Name Ravne No. Mat. No. DIN EN AISI
CT781 781 1.6587 17CrNiMo6 17CrNiMo7 4820

Chemical Composition (in weight %)

C Si Mn Cr Mo Ni V W Others
0.18 max.0.40 0.70 1.65 0.30 1.55 - - -

Description
Nickel-molybdenum alloy steel. Alloyed case hardening steel for heavy and high strained gear parts with high demands on toughness at core tensile strength of 1050-1350 N/mm2.

Applications
Severely stressed components for mechanical engineering and automobile industry. 

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210 
Density [g/cm3]: 7.87
Thermal conductivity [W/m.K]: 38.0 
Electric resistivity [Ohm mm2/m]: 0.18
Specific heat capacity[J/g.K]: 0.46

Coefficient of Linear Thermal Expansion 10-6 oC-1

20-100oC 20-200oC 20-300oC 20-400oC 20-500oC
11.2 12.1 12.9 13.4 13.9

Continuous Cooling Transformation (CCT) Diagram


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Time-Temperature Transformation (TTT) Diagram


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Soft Annealing
Heat to 650-700oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 229.

Intermediate Annealing: 630-650oC.

Hardening
Carburising: 880-980oC.
Core Hardening: 830-870oC, water.
Case Hardening: 780-820oC, water.

Normalizing
Normalizing: 850-880oC, air.

Tempering
Tempering temperature: 150-200oC.

Soft annealed treated: max. 229 HB.
Treated for cold shearability: max. 255 HB.
Treated for strength: max. 229 HB.
Treated for ferite and pearlite structure and hardness range: 159-207 HB.

Tensile Strength Rm in N/mm2 vs. Diameter in mm
After Hardening and Tempering at 200oC

Diamter in mm d<=16 17<d<=40 41<d<=100
Tensile Strength Rm in N/mm2 min. 1200 min. 1100 min. 900

Hardenability Diagram


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Forging
Hot forming temperature: 1050-850oC. 

Machinability
No data.

Forms manufactured: Please see the Dimensional Sales Program. 

Disclaimer
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.

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