月份：2019年4月

Applications:

The applications of 36CrNiMo16 Steel are numerous and includes the following:

• In Engineering: ultra high tensile applications, shafts, gears, bolts, spline shafts, crusher shafts, eccentric shafts, hard wearing bushes and high impact pistons
• In mining: rock drill, knock off bits, mill hammers, cyclone plates, high tensile mechanical and thermal shock applications
• In Tooling: plastic extrusion dies, die bolster rings and punches

Quality Standard:

BS EN10250 Open die forging for general engineering purposes
ASTM A788 Standard Specification for Steel Forgings, General Requirements

All Grades Comparison:

EN	Material No.	BS	NF
36CrNiMo16	1.6773	835M30/EN30B	35NCD16

Chemical Composition(%):

C	Mn	Si	P	S	Cr	Ni	Mo
0.32-0.39	0.30-0.60	0.40 max	0.030 max	0.025 max	1.60-2.00	3.60-4.10	0.25-0.45

Mechanical Properties(In Nomalized Condition):

Dia/Thickness(mm)	Tensile Strength Rm (Mpa)	Yield Strength R2 (Mpa)	Elongation (longitudinal direction) Al (%)	Elongation (transverse direction) At (%)	Impact properties (KV J) (longitudinal)	Impact properties (KV J) (transverse)
160 max	1000 min	800 min	11 min	8 min	45 min	22 min
160-330	1000 min	800 min	11 min	8 min	45 min	22 min
330-660	1000 min	800 min	11 min	8 min	45 min	22 min

Dimension Tolerance Standard:  DIN 7527

Ultrasonic Test: SEP 1921 C/c or specific FBH eq.

Heat Treatment:
Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each EN30B steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of this 4.25% nickel alloy steel.

Forging

Heat the steel carefully to the forging temperature of 1000-1100°C, soak well. After forging, cool slowly in a furnace to 100°C maximum and anneal immediately.

Annealing

To obtain the softest condition heat carefully to 630-650°C. Soak for a minimum of 2 hours, then cool in the furnace or in air. It is advisable to repeat this treatment to obtain the best machining characteristics.

Stress Relieving

Where the machining operations have been severe, we recommend stress relieving EN30B alloy steel before finish machining and hardening. Heat carefully to 630-650°C then cool in the furnace or in still air.

Hardening

Heat uniformly to 810-830°C and when thoroughly soaked at this temperature cool in air or quench in oil according to mass. Hardening from neutral salt baths will help to prevent scaling or decarburisation and is strongly recommended. Pre heat at 300-400°C, raise to the hardening temperature of 810-830°C, quench into salt standing at 300-320°C.  Withdraw and cool in air. Alternatively, tools may be vacuum hardened. If desired, hardened and tempered tools can be cyanide hardened to give a shallow carburised case to die surfaces with increased hardness values up to Rockwell C56-60. Temper as soon as tools are hand-warm.

Tempering

Re heat to the relevant tempering temperature. Soak for at least 2 hours per 25mm of ruling section. Withdraw from the furnace and cool in still air. Tempering between 275-450°C is not advised as tempering within this range will reduce the impact value. Tempering °C   150 250 350 450 HRc                       49 47 44 38

Mill´s test certificate:

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