18CrNiMo7-6 is a case hardening steel with high toughness. There are a number of variants with high cleanliness requirements. All variants possess tighter composition ranges compared to the standard. produced with the quality class IQ (isotropic quality). This ensures a very low number of elongated sulphide inclusions which will give more isotropic properties. The high oxidic cleanliness will enable the steel to meet the same high cleanliness demands as for re-melted qualities

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18CrNiMo7-6 hot rolled steel round bars information

18CrNiMo7-6 is a case hardening steel with high toughness. There are a number of variants with high cleanliness requirements. All variants possess tighter composition ranges compared to the standard. produced with the quality class IQ (isotropic quality). This ensures a very low number of elongated sulphide inclusions which will give more isotropic properties. The high oxidic cleanliness will enable the steel to meet the same high cleanliness demands as for re-melted qualities

Product parameters

Chemical Composition

Standard	Grade	C	Mn	P	S	Si	Ni	Cr	Mo
EN 10084	18CrNiMo7-6	0.15-0.21	0.50-0.90	≤ 0.025	≤ 0.035	≤ 0.04	1.4-1.7	1.5-1.8	0.25-0.35
	1.6587

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 ℃	200 ℃	300 ℃	400 ℃	500 ℃
Thermal expansion 10^6 m/(m.K)	11.1	12.1	12.9	13.5	13.9

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

Forging

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

Heat Treatment

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

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

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..

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Shandong Chengshun Metal Materials Co., Ltd. is located in Jinan City, Shandong Province. It is a comprehensive company dealing in high-quality steel products, with a superior geographical location and very convenient transportation. The company has a complete and scientific quality system, and has been recognized by the industry for its integrity, strength and product quality.

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Steel Round Bars