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 DIN1.6587/18CrNiMo7-6 steel Manufacturer and Exporter,supplied with round,square,flat,block,and shaft etc.DIN1.6587/18CrNiMo7-6 is a low carbon,case hardening (carburizing) steel which contains 1.8% chromium – nickel – molybdenum as strengthening agents as per EN 10084. Characterised by high core strength and toughness in medium to large sections with case hardness up to Rc62 when carburized,
Alloy steel 18CrNiMo7-6 is a grade consisting of the addition of chromium, nickel, molybdenum and coal with a range characteristic for all carburizing grades. 1.6587 materials, unlike other simple steel grades, can be used for much larger sizes and loads. This grade of steel is used for heavy-duty parts and components subjected to high pressures and highly variable speed of operation. Materials and derivatives are used for the production of special bearings, bolts, gears, shafts, or rack-and-pinions. They are related grades of steel according to UNI standards, having slightly narrowed content of Chromium, Nickel and Molybdenum.
hardened and tempered,and it is also used in area of heavy and high strained gear parts with high demands on toughness at core tensile of 1050–1350N/mm2.DIN1.6587/18CrNiMo7-6 is same as 17CrNiMo6 steel,generally supplied in the annealed condition with a maximum brinell hardness of 229 (Rc22).

1.Application
Severely stressed components for mechanical engineering and automobile industry, gear for mining, cement plants, power plants, mobile cranes and earth-moving equipment, paper mill, sugar mill, marine, wind gear, railway systems, oil platform, etc.

2.All Grades Comparison
DIN EN ANFOR AS
1.6587 18CrNiMo7-6 18NCD6 X4317

3.Quality Standard
EN 10084 Case hardening steels
DIN17210 Case hardening steels
AS1444 Wrought alloy steels

4.Chemical Composition(%)
C Mn Si P S Cr Ni Mo
0.15-0.21 0.50-0.90 0.40 max 0.025 max 0.025 max 1.50-1.80 1.40-1.70 0.25-0.35
6.HEAT TREATMENT:
Soft Annealing: Heat 17CrNiMo6 to 650-700oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 229.
Normalizing: 850-880oC, air.
Hardening: Carburising: 880-980oC. Core Hardening: 830-870oC, water. Case Hardening: 780-820oC, water.
Tempering:Temperature: 150-200oC

7.Forging:
Hot forming temperature: 1100-900oC.


8.Welding:
Pre-heat welding area to 250-450°C and maintain this temperature while welding with a low hydrogen electrode. Cool 17CrNiMo6 at a maximum rate of 100°C per hour. Weld before carburising.

Normalizing:850 – 880°C/air
Soft annealing:650 – 700°C/furnace
Stress relieve:630- 650oC
Carburising:880 – 980°C
Core hardening:830 – 870°C/water
Intermediate annealing:630 – 650°C
Case hardening:780 – 820°C/water
Tempering:150 – 200°C
7.Surface Hardness

Treated to improveshearability(+S):Max 255HB
Soft annealed(+A):Max 229HB
Treated to hardness range(+TH):179-229HB
Treated to ferrite-pearlite structure and hardness range(+FP):159-207HB
8.Application

DIN 1.6587 | 17CrNiMo6 |18CrNiMo7-6 steel for the parts which require core tensile strength and high hardness. Susceptible to the large seized parts with high wearing resistance and loading such as: Heavy Duty Bushings and Bearings, Cam Followers, Clutch Dogs, Compressor Bolts, Extractors, Fan Shafts, Heavy Duty Gears, Pump Shafts, Sprockets, Tappets, Wear Pins, Wire Guides etc..

Mechanical properties of 17NiCrMo6-4, 1.6566 steel
Hardness in condition +A: < 229 HBW Hardness in condition +TH: 179 - 229 HBW Hardness in condition +FP: 149 - 201 HBW Hardness in condition +S: < 255 HBW
Mechanical properties of 18CrNiMo7-6, 1.6587 (ZF1A) steel
Hardness in condition +A: < 229 HBW Hardness in condition +TH: 179 - 229 HBW Hardness in condition +TH: 179 - 229 HBW Hardness in condition +S: < 255 HBW
Mechanical properties of 17HNM steel
Tensile strength, Rm: 1180 - 1420 MPa Yield point, Re: > 830 MPa Elongation, A: > 7% Contraction, Z: > 30% Hardness in softened state < 229 HB
Thermal and thermo-chemical treatment processes of 17HNM steel:
Normalizing annealing at 870 - 900℃ Softening annealing at 650 - 700℃ Carburizing at 880 950℃ Hardening (I) after carburization at the temperature of 840 - 870℃ in water or oil Annealing after carburization at 630 - 650℃ Hardening (II) after carburization at 800 - 830℃ in water or oil Tempering after carburizing process at 170 - 200℃ Carbonitriding at 860 - 930℃

   AISI 8620 1,6523 | 21NiCrMo2 | SNCM220          20NiCrMo13-4 1.6660     ASTM 52100 | 1,3505 | 100Cr6 | SUJ2 | EN31       33NiCrMoV14-5 1.6956     

   AISI 4340 | 36CrNiMo4 | 1,6511 | EN24 | 817M40 | SNCM439      EN DIN 34CrNiMo6 | 1,6582 | 4337 Engineering Steel    BS EN 42CrMo4 | 1,7225 Alloy Steel  

   1,2379 | X153CrMo12 | SKD11      UNS S31254 1.4547 F44 Super Austenitic Stainless Steel      DIN 1.6657 14NiCrMo13-4 16NCD13 832M13 EN36C

   DIN1.6587 X4317 18CrNiMo7-6 17CrNiMo6 18NCD       DIN 1.6566 17NiCrMo6-4 18NiCrMo5 817M17 SAE4317       DIN 1.6657 14NiCrMo13-4 16NCD13 832M13 EN36C