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17CrNi6-6 1.5918 Engineering Steels

17CrNi6-6 1.5918 Engineering Steels engineering steels 17CrNi6-6 1.5918 Engineering Steels 17CrNi6 6 1

17CrNi6-6 1.5918 Engineering Steels

Introduction

Structural, pressure vessel and engineering steels.

Application

Alloyed case hardening steel for highly strained parts and good toughness at core tensile strength of 900 – 1200 N/mm². Driving bevel gears, crown wheels, gears, shafts, bolts for automotive and gear components.

All Grades Comparison

DIN EN
1.5918 17CrNi6-6

Quality Standard

EN 10084: 2008 Case hardening steels. Technical delivery conditions
EN 10263-3: 2001 Steel rod, bars and wire for cold heading and cold extrusion. Technical delivery conditions for case hardening steels

Chemical Composition(%)

C Mn Si P S Cr Ni
0.14-0.20 0.50-0.80 0.40 max 0.025 max 0.035 max 1.40-1.70 1.40-1.70

Mechanical Properties(T=20°C if not differently stated)

Process Diameter(mm) Tensile Strength Rm (Mpa) Hardness (HB)
Treated to improve shearability / / 255 max
SOFT ANNEALED / / 229 max
Treated for strength / / 175-229
Treated for ferrite and pearlite structure and hardness range / / 156-207
QUENCHED AND TEMPERED 16 max 1200 min /
QUENCHED AND TEMPERED 16-40 1100 min /
QUENCHED AND TEMPERED 40-100 900 min /

HEAT TREATMENT:

Process Temperature(oC) Media
Forging or hot rolling 1100-850 /
Normalising 850-880 air
Soft annealing 650-700 furnace
Carburising 880-980 /
Core hardening 830-870 oil
Intermediate annealing 630-650 /
Case hardening 780-820 oil
Tempering 150-200 /

Mill′s test certificate:

EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.