Alloy Gear Steel Carburizing Steel Bar 18crnimo7-6 1.6587 Case Hardening Steels

• Customization: Available
• Type: Round
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel
• Application: Tool Steel Bar
• Surface: Milled/Bright/Black
• Length: 1-10m
• Transport Package: Wooden
• Specification: 6-400mm
• Trademark: Smooth
• Origin: China
• HS Code: 7214100000
• Production Capacity: 5000 Ton/Year

Product Description

Introduction:  

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, 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.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	Ni	Cr	Mo
EN 10084	18CrNiMo7-6	0.15-0.21	≤ 0.4	0.5-0.9	≤ 0.025	≤ 0.035	1.4-1.7	1.5-1.8	0.25-0.35
	1.6587

3.Physical Property

Density, g/cm3	7.85
Specific heat capacity J/(kg.K)	460
Electric resistivity Ohm.mm2 /m	0.18
Electric conductivity Siemens.m/mm2	5.55
Modulus of elasticity Gpa	210
Thermal expansion 10^6 m/(m.K)	100 ºC	200 ºC	300 ºC	400 ºC	500 ºC
	11.1	12.1	12.9	13.5	13.9

4. Mechanical Property

Size mm	≤ 11	12-30	31-63
R Mpa	1180-1420	1080-1320	980-1270
Rp 0.2 Mpa	≥ 835	≥785	≥ 685
A %	≥ 7	≥ 8	≥ 5
C %	≥ 30	≥ 35	≥ 35
Kv J	≥ 44	≥ 44
Hardness HB	354-406	327-384	295-373

5.Forging
DIN 1.6587 | 17CrNiMo6 |18CrNiMo7-6 forging temperature:900 - 1100°C,cool slowly in the sand after forged.
6.Heat Treatment

• Normalizing:850 - 880°C/air
• Soft annealing:650 - 700°C/furnace
• Stress relieve:630- 650^oC
• 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.