Advanced martensitic stainless chromium steel for plastic moulds.
Thanks to electroslg remelting, special measures in hot forming and hest treatment and optimizion of chemical composition the BÖHLER grade M310 ISOPLAST offers numerous advantages:
Good corrosion resistance
Capability of taking a high polish
Good photoetching properties
Good machinibilty
High wear resistance
Application
Moulds for chemically aggresive plastics (e.g. PVC) and plastics containing abrasive fillers.
Owing to its excellent polishability, this grade is particularly
Suited for mould of lenses and other kinds of optical products, such as spectacles, camera parts.
Heat Treatment Information
Heat treatment
Hot forming
Forging
1050 to 850°C
Slow cooling in furnace or thermo insulating material.
Annealing
840 to 870°C
Slow controlled cooling in furnace at a rate of 10 to 20°C/hr (50 to 68°C) down to approx. 600°C , further cooling in air. Hardness after annealing: approx. 200HB
Stress relieving
approx. 650°C
After through heating, soak for 1 to 2 hours in neutral atmosphere/slow cooling in furnace.
Hardening
1000 to 1050°C/ Oil, air
Holding time after temperature equalization: 15 to 30 minutes.
Obtainable hardness: 53-56 HRC
Tempering
100 to 200°C
Slow heating to tempering temperature immediately after hardening/time in furmace 1 hour for each 20mm of workpiece thickness but at least 2 hours/cooling in air.
WITH A MIRRORED FINISH GUARANTEE-FOR SHINING RESULTS
OPTIMUM POLISH ABILITY FOR MIRROR FINISH
IMPROVED THERMAL CONDUCTIVITY
EXCEPTIONAL TOUGHNESS AND HARDNESS
VERY GOOD CORROSION RESISTANCE
HIGHER PRODUCTIVITY WITH LOWER COSTS
Working with tooling specialists, BÖHLER has developed a material with a revolutionary composition, manufactured via a new melting technology, resultin in the best polish ability , outstanding toughness, very good corrosion resistance and improved thermal conductivity.
This collection of positive attributes guarantees cost savings by considerably reducing the effort needed for polishing to a mirror finish; guaranteeing longer mould life, (thus ensuring reduced need for new tools, reducing maintenance and repair time, and providing security against fracture) and increasing productivity by shortening cycle times.
Thus, the production of mirrored finish moulds means no more risk for the mould maker.
Heat treatment information
Heat treatment
Soft annealing
730-780°C/Furnace cooling
hardness after soft annealing max.220HB
Stress relieving
approx.650°C
following temperature equalisation, hold at temperature for 1-2 hours ina neutral atmosphere
slow furnace cooling
Hardening
1000 to 1030°C
holding time 30 minutes, after temperature equalisation
N 2 -or oil cooling
Cryogenic treatment
Cryogenic treatment at-150°C is recommended for dimensional stability.
Tempering
Tempering should occur directly following hardening. Tempering at least twice is recommended.
Holding time in the furnace 1 hour per 20mm material thickness, at least 2 hours in any case.
The high quality material BÖHLER M340 ISOPLAST, manufactured by Pressure and Protective gas ESR, was developed by BÖHLER in close co-operation with customers.
Specific heat treatment allows us to achieve well balanced properties profiles, tailored to the application in question.
BÖHLER M340 ISOPLAST is a high performance plastic mould steel with
excellent corrosion properties, especially in salt water and media containing chloride
good harden ability and high obtainable hardness after hardening (53-58HRC)
suitable for heat treatment in vacuum equipment
fine carbide structure
good dimensional stability with appropriate heat treatment
excellent high wear resistance /sharpness durability
good mach inability
good polish ability
Heat treatment information
Heat treatment
Annealing
800 to 850°C
Cooling in furnace
Hardness after annealing: max. 260HB
Stress relieving
approx. 650°C
After through heating, soak for 1 to 2 hours in neutral atmosphere.
Slow cooling in furnace.
Hardening
980 to 1020°C/Oil
Holding time after temperature equalization:15 to 20 minutes.
Tempering
Tempering should follow hardening immediately. It is recommended to temper at least twice.
Time in furnace 1 hour for each 20mm of workpiece thickness but at least 2 hours.
Our BÖHLER M390 MICROCLEAN grade is a corrosion resistant, Martensite chromium steel.
Large percentages of small, finely dispersed Cr- and V-carbides in a matrix containing at least 12% chromium offer the following benefits:
highest corrosion resistance
optimum wear resistance
excellent polishability
Examples of applications
Mould inserts for the produotion of compact discs
Moulds for the processing of chemically aggressive plastics containing highly abrasive fillers
Moulds for the processing of duroplasts
Moulds for the prodoction of chips for the electronics industry.
Screws for injection moulding machines
Linings for injeclion moulding cylinders
Backflow check valves for injection moulding machines
Thanks to its outstanding properties, BÖHLER M390 MICROCLEAN is also suited for other industrial segments:
Machine components for the food processing industry
Knives blades
Cutting-type surgical instruments
Circular slitting knives for the meat processing industry
Heat treatment information
Heat treatment
Annealing
Approx. 1050°C/holding time at least 4 hours/controlled slow cooling in furnace at a rate of
15°C/hr down to approx. 650°C, further cooling in air.
Hardness after annealing: max. 280 HB
Stress relieving
650 to 700°C
After through heating, soak for 1 to 2 hours in neutral atmosphere/ slow cooling in furnace
Hardening
Austenitizing in salt bath or in a protective atmosphere: 1070 to 1150°C/gas, salt bath, oil
Austenitizing in vacuum: 1120 to 1200°C/ gas cooling minimum 3.5 bars.
Holding time after through heating:30minutes
The time in the cooling medium depends on the relevant workpiece size and furnace parameters.
Obtainable hardness: 60-62HRC with air cooling.
Subzero treatment
Subzero cooling or tempering twice to the maximum secondary hardness is necessary to obtain complete transformation of residual austenite. After austenitizing at temperatures above 1150°C, subzero cooling is also recommended with a view to improving dimensional stability.
Tempering
150 to 400°C/slow heating to tempering temperature immediately after hardening/time in furnace 1 hour for each 20mm of workpiece thickness, but at least 2 hours. For information on the average hardness figures obtained after tempering please refer to the tempering chart. Working hardness:56-58HRC Maximum wear resistance is obtained by :
hardening at 1150°C + 2 tempering cycles at 540°C:58-62HRC(Attention corrosion resistance is slightly reduced)
Age hardened high-performance plastic mould steel with high hardness up to max. 40HRC and high wear resistance.
Very good machinability, good polishability and photoetching properties and electric discharge machinability. Good weldability.
Application
Precision-injection moulds of all sizes, also for the largest dimensions, e.g. moulds for the production of Camera parts; Electronic parts
Compression moulds for all types, e.g. plastic container.
Mould for the processing of elastomer.
BÖHLER M461 EXTRA offer the following advantages:
In delivery condition age hardened heat treatment is no necessary.
High hardness 38-40HRC at the center of large dimensions
Isotropic mechanical properties
Excellent machinability in delivery condition solution annealed, very good machinability in the delivery condition age hardened.
Very good electric discharge machinability
Good polish and photodischargeability
Good weldability
Suited for all nitriding processes serving to improve ear resistance. No decrease of hardness by the tufftriding methode through high retention of hardness up to 570°C
In the condition solution annealed the nitriding process can replace hot ageing.
Suited for hard chromium plating and other surface coating processes.
Minor dimensional change by heat treating process
Heat treatment information
Heat treatment
Hot forming
Forging
1100 to 900°C
Slow cooling in furnace or thermoinsulating material.
Cold work tool steel with excellent toughness and good wear resistance.
Application
High duty machine knives for the cellulose, paper and fiber board industries. Flat and circular shear blades for plates up to 15mm thinkness.
Heat treatment information
Heat treatment
Hot forming
forging
1050 to 850°C
Slow cooling in furnace or thermo insulating material.
Annealing
800 to 850°C
Slow controlled cooling in furnace at a rate of 10 to 20°C / hr down to approx. 600°C , further cooling in air. Hardness after annealing: max. 240HB
Stress relieving
650 to 700°C
Slow cooling in furnace ; intended to relieve stresses set up by entensive machining, or in complex shapes. After thorough heating, hold in neutral atmosphere for 1-2 hours.
Hardening
1000 to 1020°C / Oil, salt bath(400 to 450°C )
1020 to 1040°C / Air
Holding time at hardening temperature: 15 to 30 minutes.
Obtainable hardness: 63-65 HRC Oil and salt bath hardening, 60-62 HRC air hardening.
Tempering
Slow cooling to tempering temperature immediately after hardening/ time in furnace 1 hour for each 20mm of workpiece thickness but at least 2 hours/ cooling in air.
Martensitic precipitation hardenable chromium-nickel-copper steel possessing high strength and toughness. Further strengh increments can be obtained by cold forming, followed by a precipitation hardening treatment. The alternative to conventionally melted BÖHLER N700 EXTRA is BÖHLER N700 ISOEXTRA produced by the Electroslog remelting procedure (ESR) or remelted under vacuum at BÖHLER N700 VMR .
Application
Aircraft and rocket engineering, mechanical engineering, power generation, measuring and control technique.
Service temperatures--High-temperature applications:
Suidet up to 350°C
For short periods, may be used at temperatures up to 50°C mas. below the precipitation hardening temperature.