Stainless Steels

Complete solutions from one source• drilling from ø 0.8 mm and up to 80xD drilling depth• HPC reaming with highest accuracy• HPC milling with perfect surface finish• threading tools for every application• custom made modular tools
Edition20121Guhring solutions for the machining of stainless steels
Stainless steels and their attributes
Stainless or acid-resistant steels have a very high chromium content > 12 %, an excellent resistance against
chemically aggressive substances and corrosion. The chromium creates a micro oxygen diffusing chromium dioxide
coating on the surface, that prevents in-depth corrosion.
Most stainless steels are from the austenitic group of steels. Next to chromium, nickel is the most important
constituent of the structure, often molybdenum is also added to optimise the mechanical characterisics. The rangeof application of austenitic steels is the food industry, power plants and energy supply, ship building and thepetrochemical industry, but increasingly also applications in architecture for wall cladding and roofing. Typicalmaterials are 1.4301 (X5CrNi 18 10 / V2A), 1.4541 (X6CrNiTi 18 10), 1.4571 (X6CrNiMoTi 17 12 2 / V4A) or 1.4311(X2CrNiN 18 10).

Cover picture and picture above:
With kind permission ofKreyenberg, Norderstedt.

2

Guhring solutions for the machining of stainless steels
Properties and attributes when machining
When machining stainless or acid-resistant steels, the following properties should be noted: These materials tend
to work harden, are very poor conductors of heat and display a high toughness and shear elongation. The hightoughness leads to a very heavy cutting load especially when drilling and when producing threads. In addition, themechanical properties of stainless or acid-resistant steels produce unfavourable chips that tend to stick and jam.

Optimal machining and tool selection
Stainless or acid-resistant steels due to their properties and attributes require sharp tools with their back taper andclearance angle configured in such a way that the high elastic deformation does not lead to a jamming of the tool
when machining.
High feed rates result in an optimal dissipation of heat via the chips, a very good cooling lubrication - ideally via
internal cooling - supports the removal of heat as well as chip evacuation and, in addition, counteracts the work
hardening. As coolant we recommend high-performance cutting oil, but at least 8 % soluble oil. In addition, pecking
may be necessary during machining.
A relatively low cutting speed should be chosen and can greatly depend on the material composition. Machining
tests are paramount for selecting the optimal cutting speed.
Due to the high work load particular attention must be paid to maximum rigidity of the machine as well as theworkpiece and tool clamping. Always select the shortest possible tool for your machining task.

3Drilling tools for stainless steels
Ratio drills RT 100 VA and RT 100 TConstant high performance and accuracy in stainless steels is provided by Guhring‘s Ratio drills RT 100 VA in the diameter range from 3.0 to 20.0 mm for the drilling depths 3xD and 5xD as well as Guhring‘s Ratio drills RT 100 T in thediameter range from 3.0 to 14.0 mm for the drilling depths 15xD, 20xD, 25xD, 30xD and 40xD. The geometries, toolmaterials and coatings of these two Ratio drills is especially adapted for the machining of stainless steels enabling thehighest cutting parameters, perfect surface quality and secure chip evacuation especially from deep holes. This is supported by numerous drilling tests and application examples:

Selected machining results RT 100 VA
Guhring no.

8511

8511

Diameter

8.0

15.0

6.8

Coating

TiAlN nanoA

TiAlN nanoA

TiAlN nanoA

Material groupstainless steel

stainless steel

stainless steel

Material
description

X5CrNi18 101.4301X6CrNiMoTi17-12-2
1.4571X6CrNiTi1810
1.4541345828through hole

blind hole

blind hole

Drilling depth [mm]Hole type

8611

Cooling

internalinternalinternal

Lubricantsoluble oilsoluble oilsoluble oil

machining centre

machining centre

machining centre

Machine typevc [m/min]

509060f [mm/rev.]

0.2

0.14

0.1

Tool life [m]140631506512

6513

Selected machining results RT 100 T
Guhring no.

6511

Diameter

3.5

8.0

5.0

Coating

TiAlN

TiAlN

TiAlN

Material groupstainless steel

stainless steel

stainless steel

Material
description

X5CrNi18 101.4301X6CrNiTi1810
1.4541X6CrNiMoTi17-12-2
1.457115210

150

through holethrough holethrough hole

Drilling depth [mm]Hole type
Coolinginternalinternal

internal

Lubricantsoluble oilsoluble oilsoluble oil

machining centre

machining centre

machining centre

Machine typevc [m/min]

903035f [mm/rev.]

0.04

0.08

0.04

Tool life [m]

85

11184

Drilling tools for stainless steels

Standard

Type

Shank
form

Tool description and application

Drilling depth

Tool material

SurfacefinishDiameter range

Guhringno.

RT 100 VA - Ratio drills
with coolant ducts
DIN
RT 1006537 K
VA

HA

3xD

solid
carbide

TiAlN
nanoA

3.000

- 20.000

8510

DIN
RT 1006537 K
VA

HE

3xD

solid
carbide

TiAlN
nanoA

3.000

- 20.000

8610

DIN
RT 1006537 L
VA

HA

5xD

solid
carbide

TiAlN
nanoA

3.000

- 20.000

8511

DIN
RT 1006537 L
VA

HE

5xD

solid
carbide

TiAlN
nanoA

3.000

- 20.000

8611

RT 100 T - Ratio drills
with coolant ducts
Guhring RT 100
standard
T

HA

15 x Dsolid
carbide

TiAlN

3.00

- 14.00

6509

Guhring RT 100
standard
T

HA

20 x D

solidcarbideTiAlN

3.00- 14.00

6511

Guhring RT 100
standard
THA

25 x D

solidcarbide

TiAlN

3.00

- 12.00

6512

Guhring RT 100
standard
THA

30 x D

solidcarbide

TiAlN

3.00

- 10.00

6513

Guhring RT 100
standard
T

HA

40 x Dsolid
carbide

TiAlN

3.00

-6514

8.00

5

Drilling tools for stainless steels
Solid carbide micro-precision drills
For especially small holes in stainless steels Guhring offers solid carbide micro-precision drills with diameters between
0.8 and 3.0 mm. They are available without internal cooling for the drilling depths 4xD and 7xD as well as with internalcooling for the drilling depths 8xD and 15xD.

Selected solid carbide micro-precision drill machining results
Guhring no.

6408

6412

6408

Diameter

2.6 mm

2.1 mm

1.4 mmCoating

TiAlN SuperA

TiAlN SuperA

TiAlN SuperA

Material groupstainless steel

stainless steel

stainless steel

Material
description

105CrMo17
1.4125X6CrNiTi18 101.4301X6CrNiTi18 101.4301

8xD

15xD

8xD

Hole typeblind hole

blind hole

blind hole

Cooling

internal 100 bar

internal 80 bar

internal 80 barLubricant

neat oilsoluble oilsoluble oil

machining centre

machining centre

machining centre

Drilling depth

Machine typevc [m/min]

53

60

60

f [mm/rev.]

0.06

0.03

0.021

Tool life [m]500 parts, end of tool life not reached!

60

50

GU 500 high-speed steel drills
For smaller batch sizes as well as unstable machine conditions the application of HSCO GU 500 drills is recommended.
They have a reinforced straight shank and are available in short or extra short lengths.
GU 500 high speed drills achieve excellent machining results in stainless steels:

GU 500 selected machining results
Guhring no.

511

Diameter

5.56

6.8

6.0

Coating

TiN

TiN

TiN

Material groupstainless steel

stainless steel

stainless steel

Materialdescription

XCrNi18-10/
1.4304

XCrNi18-10/
1.4304

X6CrNiMoTi17-12-2
1.4571

Drilling depth [mm]Hole type

511

512

43

30.8

22.0

through holethrough hole

blind hole

Coolingexternal

external

external

Lubricantsoluble oilsoluble oilsoluble oil

machining centre

machining centre

machining centre

Machine typevc [m/min]

401014f [mm/rev.]0.10.08

0.1

Tool life [m]

930.5

56

Drilling tools for stainless steels

Standard

Type

Shankform

Tool description and application

Drilling
depth

Tool material

SurfacefinishDiameter range

Guhringno.

Solid carbide micro-precision drills
without coolant ducts
Guhring
standard

N

HA

4xD

solidcarbide

TiAlN
Super A

0.800-

3.000

6400

Guhring
standard

N

HA

7xD

solidcarbide

TiAlN
Super A

0.800-

3.000

6401

Solid carbide micro-precision drills
with coolant ducts
Guhring
standard

N

HA

8xD

solidcarbide

TiAlN
Super A

1.400-

3.000

6408

Guhring
standard

N

HA

15 x D

solidcarbide

TiAlN
Super A

1.400-

3.000

6412

Guhring
GU 500standard

3xD

HSCO

TiN

3.00

-

14.00

512

Guhring
GU 500standard

5xD

HSCO

TiN

3.00

-

14.00

511

GU 500twist drills with reinforced shank7

Drilling tools for stainless steels
EB 80 and EB 100 single-flute gun drills
Guhring provides single-flute gun drills type EB 80 and EB 100 ex-stock especially for close tolerances or for primarily
deep holes and especially for the machining of high-alloyed and stainless steels. Thanks to their special carbide grade,geometry and coating they achieve long tool life in stainless steels as the machining results listed below demonstrate.

Selected machining results EB 80
Guhring no.

5640

EB 1005641

5637

Diameter

6.0

10.0

2.5

Coating

TiCN

TiCN

SuperA

Material groupstainless steel

stainless steel

stainless steel

Material
description

X5CrNi1810
1.4301X6CrNiTi181C
1.4541

X620CrNiMoTi17-12-2
1.4571

175

380

110

through hole

blind hole

blind hole

Drilling depth [mm]Hole type
Cooling

internal

internal

internal

Lubricantsoluble oilsoluble oilsoluble oil

machining centre

machining centre

machining centre

Machine typevc [m/min]

5540

45

f [mm/rev.]

0.014

0.016

0.008

Tool life [m]

3.5

2.7

2.1

8

Drilling tools for stainless steels

Flute length(mm)/Drilling depth

Tool material

SurfacefinishGuhring
EB 80
standard

20 x D

Solid
carbideTiCN

4.000- 12.000

5639

Guhring
EB 80
standard

30 x D

Solid
carbideTiCN

4.000- 12.000

5640

Guhring
EB 80
standard

40 x D

Solid
carbide

TiCN

4.000

- 12.0005641

Guhring
EB 80
standard

80 x D

SolidcarbideTiCN

4.950- 11.950

5642

Guhring
EB 100standard

45.00

Solid
carbideTiAlNSuperA

2.000-

3.2005632

Guhring
EB 100standard

80.00

Solid
carbideTiAlNSuperA

2.000-

5.0005633

Guhring
EB 100standard

120.00Solidcarbide

TiAlN
SuperA

2.000-

5.0005637

Guhring
EB 100standard

160.00Solid
carbideTiAlNSuperA

2.000-

8.0005638

Standard

TypeTool description and application

Diameter range

Guhringno.

Gun drills EB80
with coolant ducts

Gun drills EB100
with coolant ducts

9Reaming tools for stainless steels
HR 500 high-performance reamers and solid carbide NC-reamers
High-performance and extreme accuracy are the features of Guhring‘s HR 500 reamers and solid carbide NC-reamers.
HR 500 high-performance reamers excel as solid carbide tools in the diameter range up to 20.00 mm with highest
performance levels. They are also available as carbide-tipped tools in the diameter range from 22.0 to 40.0 mm, so thetool material is optimally adapted to the machining task.
Guhring‘s NC-reamers are designed to satisfy the high quality demands in the production arena and are designed for
accurate clamping in hydraulic chucks and shrink fit chucks.

HR 500 selected machining results
Guhring no.

1686

1685

1685

1685

Diameter

10.0

16.0

5.0

7.0

Coating

TiAlN

TiAlN

TiAlN

TiAlN

stainless steel

stainless steel

stainless steel

stainless steel

X6CrNiMoTi17 12 2
1.4571

X20CrNi17 2
1.4057

X10CrNiS18 91.4305

X1CrNiMoN25 25 2
1.4465

25.0

19.0

7.5

65

through hole

blind hole

blind hole

blind hole

Material group
Material
description
Drilling depth [mm]Hole type
Cooling

internal

internal

externalinternal

Lubricantsoluble oilsoluble oilsoluble oilneat oilmachining centre

machining centre

machining centre

turning centre

Machine typevc [m/min]

80

1006060fz [mm]0.130.250.20.13

Tool life [m]2528.5

12195

Solid carbide NC-reamers
selected machining results
Guhring no.

1449

Diameter

7.0

Coating

TiN

Material group
Material
description
Drilling depth [mm]Hole typestainless steel
X6CrNiMoTi17 12 2
1.457120,0through hole

Coolingexternal

Lubricantsoluble oil

Machine typevc [m/min]machining centre
6fz [mm]0.025

Tool life [m]7.010Reaming tools for stainless steels

Tool material

SurfacefinishGuhring HR 500 straightstandard
Sh6solid
carbide

TiAlN

4.000

- 20.000

1685

Guhring HR 500 straightstandard
S
h6

solid
carbide

TiAlN

3.970

- 12.030

1675

Guhring HR 500 straightstandard
D
h6

solid
carbide

TiAlN

4.000

- 20.000

1686

Guhring HR 500 straightstandard
D
h6

solid
carbide

TiAlN

3.970

- 12.030

1676

carbideTiAlN

22.000 - 40.000

1680

carbideTiAlN

22.000 - 40.000

1681

Standard

Type

Shankform

Tool description and application

Diameter range

Guhringno.

HR 500 S
for blind holes

HR 500 D
for through holes

HR 500 GS
for blind holes
Guhring HR 500 straightstandard GS
h6

HR 500 GD
for through holes
Guhring HR 500 straightstandard GD
h6

Solid carbide NC-reamers
with extremely unequal spacing
Guhring
standard

straight
h6

solid
carbidebright0.980- 12.050

1427

Guhring
standard

straight
h6

solid
carbidebright3.000- 12.000

1449

11

Milling tools for stainless steels
Ratio end mills RF 100 VA
RF 100 high-performance end mills excel with different spiral angles, resulting in a vibration-free cut. With the unequal
helix, a considerably better surface quality is achieved on finishing operations and clearly higher feed rates can beachieved with slot drilling and rough milling.
With many applications the complete milling process can be covered with a RF 100, generating a considerable costadvantage in addition to an increase in tool life and dimensional accuracy of the workpiece.
In combination with the newly developed roughing geometry RF 100 VA/NF milling cutters enable a drastic increase
in tool life compared to conventional roughing end mills with round or flat knuckle-type teeth. At the same time thesurface quality improves to a peak-to-valley depth of approximately Ra = 2-3µm, making finishing operations in manycases unnecessary. In addition, the new design reduces power consumption in comparison to conventional RF 100 end
mills, allowing application in unstable conditions and on less powerful machines.

RF 100 VA and RF 100 VA/NF selected machining results
Guhring no.

3805

3803

3080

3718

3803
RF 100 VA

RF 100 VA

RF 100 VA

RF 100 VA

RF 100 VA/NF

Diameter

12.0

12.0

12.7

12.0

12.0

Coating

TiAlN nanoA

TiAlN nanoA

TiAlN nanoA

TiAlN nanoA

TiAlN nanoA

Material groupstainless steel

stainless steel

stainless steel

stainless steel

special alloy

Material
description

X5CrNi13 41.4301

X12CrMoS17
1.4104

X6CrNiMoTi17 12 2
1.4571

X10CrNiS18 91.4305

Inconel 625

Cutting depth ap [mm]

6.0

12.0

14.5

18.0

12.0

Cutting width ae
[mm]

3.0

6.0

2.5

12.0

12.0

rough millingrough milling

finish milling

slot drilling

slot drillingwithout

Type

Milling type
Coolingexternal

external

Lubricantsoluble oilsoluble oil

machining centre(BT 40)machining centre(BT 40)Machine type

machining centre(BT 50)external

external

soluble oilsoluble oil

machining centre(HSK 100)

machining centre(HSK 63)vc [m/min]

113

190

118

7233fz [mm/tooth]

0.084

0.04

0.08

0.065

0.04

Tool life [m]

81132

45

(126 min.)(70 min.)12Milling tools for stainless steels

StandardType

Shankform

Tool description and application

Tool material

SurfacefinishDiameter range

Guhringno.

Ratio end mills RF 100 VA
centre cutting
DINNH
6527 K 36°/38°

HASolidcarbide

TiAlN
nanoA

4.000

- 20.000

3804

DIN
NH
6527 K 36°/38°

HB

Solid
carbide

TiAlN
nanoA

4.000

- 20.000

3805

DIN
NH
6527 L 36°/38°

HA

Solid
carbide

TiAlN
nanoA

6.000

- 25.000

3800

DIN
NH
6527 L 36°/38°

HB

Solid
carbide

TiAlN
nanoA

6.000

- 25.000

3803

GuhringNHstandard 36°/38°

HA

Solid
carbide

TiAlN
nanoA

6.000

- 20.000

3806

GuhringNHstandard 36°/38°

HB

Solid
carbide

TiAlN
nanoA

6.000

- 20.000

3807

Ratio end mills RF 100 VA/NF
centre cutting
DIN
NF
6527 L 36°/38°HA

Solidcarbide

TiAlN
nanoA

6.000

- 25.000

3696

DIN
NF
6527 L 36°/38°

HB

Solid
carbide

TiAlN
nanoA

6.000

- 25.000

3718

Guhring
NF
standard 36°/38°

HA

Solid
carbide

TiAlN
nanoA

6.000

- 20.000

3733

Guhring
NF
standard 36°/38°

HB

Solid
carbide

TiAlN
nanoA

6.000

- 20.000

3885

13

Threading tools for stainless steels
Taps, fluteless taps and thread milling cutters
Diversity is the motto of Guhring‘s threading tools for the machining of stainless steels. The user can find a suitable toolfor every machining task in Guhring‘s wide-ranging threading tool program.
On these pages we are only introducing reference tools for ISO metric threads. Taps, fluteless taps and thread milling
cutters are also available for all thread types and tolerance zones. Furthermore, there are alternative tools available withother surface finishes for further thread depths etc. The complete threading tool program can be found in the current
threading tool catalogue.

Selected machining results fortappingfluteless tapping

Guhring no.

2086

2896

Diameter

M10

M16

M6

M6

Coating

TiN

TiN

TiNTiN

Material groupstainless steel

stainless steel

stainless steel

stainless steel

Materialdescription

X5CrNi13 41.4301X6CrNiMoTi17 12 2
1.4571X2CrNiMo17-12-2
1.440421.0

30.0

through hole

blind hole

Coolingexternal

external

Lubricantsoluble oilneat oil

Machine type

machining centre

turning centrevc [m/min]

101250 threads

Thread depth [mm]Hole type

Tool life

59322

1972

M10M8

M16x1.5

TiCN

TiN

TiCN

stainless steel

stainless steel

stainless steel

X2CrNiMo18-14-3
1.4435 Guss

X10CrNiS18 91.4305X5CrNi13 41.4301X6CrNiMoTi17 12 2
1.4571

12.0

15.0

20.0

18.0

16.0

blind hole

blind hole

blind hole

blind hole

blind holeexternal

external

external

external

internal

soluble oilsoluble oilneat oilneat oilsoluble oil

machining centre

turning centre

machining centre

turning centre

machining centre

8856

6

12640 threads

730 threads

480 threads

970 threads

1680 threads

6350 threads

Selected machining results for thread milling
Guhring no.

3526

3541

Diameter

M8M24

Coating

TiCN

TiCN

Material groupstainless steel

stainless steel

Material
description

X5CrNi13 41.4301X6CrNiMoTi17 12 2
1.4571Thread depth [mm]Hole type

16.0

30.0

blind hole

blind hole

Cooling

internal

internal

Lubricantsoluble oilsoluble oil

machining centre

turning centre

Machine typevc [m/min]

6060fz [mm]

0.05

0.08

Tool life

1140 threads(climb milling)

1350 threads(climb milling)

14761

1139

Threading tools for stainless steels

Standard

Type

Tolerancezone

Tool description and application

Tool material

SurfacefinishDiameter range

Guhring
no.

HSS-E

TiN

M3-

M102086

Tapsfor through holes
DIN 371

VA/B

ISO 2 /
6H

Taps
for blind holes
VA
R15/C

ISO 2 /
6H

HSS-E

TiN

M3-

M102896

DIN 371/ VA
DIN 376 R45/C

6HX

HSS-E

TiAlN

M2-

M30

393

DIN 374

VA
R45/C

6HX

HSS-E

TiAlN

M6 X
0.75

-

M24 X
1.5394

DIN
5156

VA
R45/C

HSS-E

TiAlN

G 1/16 -G1395

DIN 371

VA
R40/C

ISO 2 /
6H

HSS-E-PM

TiN

M3-

M1059

DIN 371

VA
R50

6HX

HSS-E-PM

TiN

M3-

M10761

DIN 371

VA
R50

6HXHSS-E-PM

TiCN

M5-

M101139

DIN 371

Fluteles taps
for through holes and blind holes~DIN371

N/C

6 HX

HSS-E-PM

TiN

M3-

M10322~DIN
371

N/C

6 HX

solidcarbide

TiCN

M3-

M101972

Guhring
TMC SP
standard

solidcarbide

TiCN

M3-

M203526

Guhring
TMU SP
standard

solidcarbide

TiCN

≥14-

≥303541

Thread milling cuttersfor through holes and blind holes

15Modular tools for stainless steels
Made to measure - modular tools from Guhring
Guhring manufactures modular tools individually tailored to your specific machining task. Our aim is to solve complex
machining tasks with intelligent tooling solutions as simply and quickly as possible, in order to save your production
time and costs.

16Modular tools for stainless steels

17

special toolingsolutionstapping/thread
milling/flutelesstapping

countersinking/de-burring

milling

Modular tooling systems

reaming

pcd/pcb

tool restoration service

Gühring oHG
P.O. Box 100247 • 72423 Albstadt
Herderstraße 50-54 • 72458 Albstadt
Tel. +49 74 31 17-0
Fax +49 74 31 17-21279
info@guehring.de
www.guehring.deNo liability can be accepted for printing errors or technical changes of any kind. All products marked with “DIN“, deviatingfrom the dimensions listed in the catalogue, can be delivered, as long as they are in conformity with the DIN standard form.
Our Conditions of Sale and Terms of Payment apply. Available on request.

146 980/1286-VII-15 • Printed in Germany • 2012Drilling