N Prospekt 2008 e(D)

Nitriding Technology

Plasma-nitriding

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successful customers are our successful customers are our successsuccesss

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Tools in a plasma-nitriding equipment

Hardening technology - Nitriding technology - Coating technology with HIGH-TECH KNOW-HOW in application system

Our division plasma-nitriding carries out the following heat treatments:

• Plasma-nitriding

• Improx®-oxidation

• Nitriding suitable for UniTwin®-coating

To the fore at are high-quality steels:

• Tool steels

• Cold-work steels • Hot-work steels • Plastic mould steels

• Heat-treated steels

• Case-hardening steels

• Corrosion-resistant steels

• High-speed steels

• Powder-metallurgical steels

Having worked in steel treatment for decades and by consis-tently cooperating with renowned steel producers, is able to guarantee maximum customer satisfaction on highest level.

Our Market

We have satisfied customers in the:

• Engineering industry

• Gear industry

• Device engineering

• Plastics processing

moulds and melting section units

• Aluminium forming

pressure casting dies, extrusion dies

• Cold-forming tools

• Sintering press tools

• Paper manufacturing and recycling

The advantages of plasma-nitriding are:

• Clean and environmentally-friendly process e.g. there are no harmful residues and substances

• High flexibility of the process

• High grade of automation

• No porous zone in the compound layer

• The results of the process are very good

reproducible

• Determination of the layer structure

• Less roughing of the surface

• Possibility of using low process temperatures (below the tempering temperature)

• Optimized dimensional stability

• Easy removing of passivated surface layers on high chromium-alloyed steels by sputtering (surface activating)

• Possibility of partial nitriding

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Plasma-nitriding equipments

Open plasma-nitriding equipment

Batch build-up


Plasma-Nitriding

Nitriding with compound layer

(DIN 1.7131)

(diffusion zone / compound layer)

Nitriding without compound layer

(DIN 1.4122)

(diffusion zone)

100 μm

50 μm

100 μm

Representation of the nitride case depth

Further advantages of plasma-nitriding technique are:

• Increase of resistance against abrasive wear

• Decrease of adhesion

• Improvement of removing parts from the mould

• Improvement of the corrosion resistance of un- alloyed and low-alloyed steels

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Melting section unit (DIN 1.4122)

Plastic mould (DIN 1.2311)

Melting section unit (DIN 1.2343)


Tips for plasma-nitriding technique:

• If cooling bores are closed with copper plugs, plasma-nitriding is partly possible.

• Please use brazing filler metal only with melting temperatures above 800°C.

• Already at an angle of < 90 ° the edges are bul- ging.

• The tools and components should be metallic- shining and free of oxidation and corrosion.

• The bores must be free from lubrication and cooling liquids, lacquers or plastic residue.

• For the partial nitriding please attach a drawing where you please indicate, which parts have to be nitrided.

• In your order you should mention the tensile strength and the lowest tempering temperature.

• Please indicate the exact description of the material and the requested nitride case depth.

hardening curve:

acc. to DIN 1.2311

acc. to DIN 1.7131

acc. to DIN 1.2343

acc. to DIN 1.8550

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Milling tool for crankshafts (DIN 1.6590)

Special Treatments

We offer our customers the followingspecial treatment processes:

• Improx®- oxidation*

• Plasma-nitriding suitable for UniTwin®- coating

• Partial plama-nitriding

* Improx®- oxidation is a process which will first plasma-nitride the surface to achieve a special compound layer.

Afterwards a thin film consisting mainly of Fe3O4 (magnetite) will be deposited on this layer.

This magnetite is a dark blue to black oxide with a very high corrosion resistance, that does not react with most of the chemical elements.

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Reversible carbide tip tools (DIN 1.2343)

Reversible carbide tip tools

Plastic mould for the automotive industry (DIN 1.2312)


Service Performances

We guarantee your success - not only through our daily achievements in hardening and surface technology, but also through our wide range of services:

Following tests can be effected at our own, state-of-the-art laboratories:

• Material analysis

• Microstructure analysis

• Damage analysis

• Nht (nitride case depth) measurement

• Case-hardening thickness measurement

• Hardness testing • acc. to Rockwell HRC • acc. to Vickers HV • acc. to Brinell HB

• Crack detection • with die penetration • with flux

Delivery notes should always indicate whether heat treatment suitable for PVD-coating or ero-ding is required. This will enable us to ensure opti-mum heat treatment for your tools.

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Our pick-up-Service

Laboratory test

Hardness testing acc. to Vickers


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Hardening technology Hardening technology Coating technology

Vacuum hardening Plasma-nitriding PVD/PACVD coating

Induction hardening Gas-nitriding High-performace coating systems

Controlled atmosphere

hardening

Oxidizing Tribological coating systems

˙ in gas UniTwin® - combination systems

˙ in plasma

Improx® -oxidizing

Service

Laboratory (analyses, sample tests)

Consulting (materials, layouts)

Pick-up-service (with own fl eet)

UniCut® = Trade Mark of Fraisa (Switzerland)

Improx®/ UniDur® / UniNox® / UniPlus® / UniTwin® / TT® / WCC®/ Calida® = Trade Marks of H-O-T Härte- und Oberfl ächentechnik GmbH & Co. KG (Germany)

photography & design: www.fi namedia.de

H-O-T Vertriebs- und Logistik-Center GmbH & Co. KG

90425 Nürnberg Kleinreuther Weg 118 Phone: +49(0)911 - 36014-42 Fax: +49(0)911 - 36014-25 [email protected]

Our centers in Germany

Nürnberg (4 x) 04626 Schmölln-Nitzschka 59457 Werl 73095 Albershausen 96155 Buttenheim

87766 Memmingerberg

Our center in Turkey

16250 Bursa

2007

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N Prospekt 2008 e(D)

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