P L A S T I C M O U L D S T E E L

RS 100

→ P L A S T I C M O U L D S T E E L

RS grade W.Nr. DIN AISI

RS 100 1.2312 40CrMnMoS8-6 ~P20

RS 101 1.2311 40CrMnMo7 ~P20

RS 103 1.2738 40CrMnNiMo8-6-1

RS 105 1.2738 mod. HH

RS 110 RAVNEX 1.2738 mod. HH ESR

RS 118 1.2085 X33CrS16

RS 120 RAVNEX

RS 130 1.2083 ESR X42Cr13 420

RS 131 1.2083 X42Cr13 420

RS 140 1.2316 ESR X36CrMo17

RS 141 1.2316 X36CrMo17

Family of RS plastic mould steel

GENERAL CHARACTERISTICS . . . . . . . . . . . . 4Chemical composition Application Microstructure in delivered condition Toughness Qualitative comparison

PHYSICAL PROPERTIES . . . . . . . . . . . . . . 7

MECHANICAL PROPERTIES . . . . . . . . . . . . 8

Compressive yield strength

CONTINIOUS COOLING CURVES-CCT . . . . . . . . . 9

HEAT TREATMENT . . . . . . . . . . . . . . 10Annealing Stress relieving Hardening Tempering Dimensional changes during hardening and tempering

WELDING AND EDM . . . . . . . . . . . . . 12Welding

Electrical discharge machining

RECOMENDATIONS FOR MACHINING . . . . . . . . 13

RS 100

C O N T E N T S

RS

100

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RS 100 is a high quality steel for moulds for plastics produced in SIJ group. Tool steel RS 100 is known for its:

• Good wear resistance• Moderate polishability• Good Machinability• Delivered in pre-hardened condition• Homogeneity• Nitrability• Tempering resistance• Dimensional stability

Controlled chemical composition with minimal concentration of detrimental elements and controlled cleanliness.

RS 100 is used for moulds for plastic processing and mould frames. Its application can be found in pressure die casting (clamping and holder plates), for prototypes, extrusion dies for thermoplastics. It is known for its good machinability.

RS 100 is usually used for medium sized moulds where moderate polishing is required (plastics and rubber moulds).

RS GRADE AISI W.Nr. C Mn S Cr Mo

RS 100 ~P20+S 1.2312 0.40 1.50 0.075 1.90 0.20

Chemical element content is in wt %

R S C H E M I C A L C O M P O S I T I O N ( % )

R S A P P L I C A T I O N

G E N E R A L C H A R A C T E R I S T I C S

500 ×

RS

100

5

NOTES

→ M I C R O S T R U C T U R E I N D E L I V E R E D C O N D I T I O N

RS 100 is supplied in pre-hardened condition at 280-325 HBW.

RS 100 is inspected in hardened and tempered condition. Microstructure is composed of fully homogenous tempered martensite and bainite with uniformly distributed sulfides for improved machinability.

G E N E R A L C H A R A C T E R I S T I C S

NOTES

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T O U G H N E S S

Q U A L I T A T I V E C O M P A R I S O N

Smaller to medium size moulds are recommended for particular grade. Larger size moulds demand higher toughness.

Chart shows machinability of RS 100 compared to RS 101 and RS 103. Properties are measured at 25 °C. Milling and drilling speed is higher compared to RS 101. Tool life is increased due to lower tool wear.

300 HB0

50

100RS 100

RS 101RS 103

Mac

hina

bilit

y (%

)

G E N E R A L C H A R A C T E R I S T I C S

7

NOTES

RS

100

→ P H Y S I C A L P R O P E R T I E S ( T E M P E R A T U R E D E P E N D E N T )

D E N S I T Y (g /c m 3 )

7.83 (20 °C) * (400 °C) * (500 °C) * (550 °C) * (600 °C)

T H E R M A L C O N D U C T I V I T Y (W/(m.K))

33.3 (20 °C) * (400 °C) * (500 °C) * (550 °C) * (600 °C)

E L E C T R I C R E S I S T I V I T Y (O hm.mm 2/m)

0.19 (20 °C) * (400 °C) * (500 °C) * (550 °C) * (600 °C)

S P E C I F I C H E AT C A PA C I T Y ( J/(g .K))

0.46 (20 °C) * (400 °C) * (500 °C) * (550 °C) * (600 °C)

M O D U L U S O F E L A S T I C I T Y (10 3 xN/mm 2 )

210 (20 °C) * (400 °C) * (500 °C) * (550 °C) * (600 °C)

C O E F F I C I E N T O F L I N E A R T H E R M A L E X PA N S I O N (10 - 6 °C -1, 20 °C)*

11.70 (100 °C) 13.10 (200 °C) 13.50 (300 °C) 14.00 (400 °C) 14.40 (500 °C)

CTE is the mean coefficient of thermal expansion with reference temperature of 20 °C.

P H Y S I C A L P R O P E R T I E S

RS

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High compressive yield strength, RC0.2, of tool steel is needed to avoid or to minimize plastic deformation. Compressive yield strength in as-delivered condition is between 900 - 1100 N/mm2.

M E C H A N I C A L P R O P E R T I E S

9

NOTES

RS

100

Austenitising temperature: 860 °C, holding time: 15 min

Pre-hardened tool steel is machined without additional heat treatment, except where additional stress reliving is necessary.

1 10 1000100 10000 100000

100010010

10

1

1

Time in minutes

Time in hours

Time in seconds

Marks:A - AusteniteP - PerliteM - MartensiteB - Bainite

Tem

pera

ture

in (˚

C)

0

100

200

300

400

500

600

700

800

900

1000

1100

1200

655HV

645HV

645HV

638HV

611HV

455HV

411HV

290HV

Ac₃= 780 °C

A

Ms BM

P

V� T = 0,03 °C/sek

V� T = 0,08 °C/s

V� T = 2,5 °C/sek

V� T = 1,3 °C/sek

V� T = 0,15 °C/sek

V� T = 8 °C/sek

V� T = 40°C/sekV� T = 32,7 °C/sek

Ac₁= 730 °C

10

10

15

5 5 5

15 %

80 %

90

8085

TIP 1 ←

C O N T I N I O U S C O O L I N G C U R V E S - C C T

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A N N E A L I N G

S T R E S S R E L I E V I N G

H A R D E N I N G

Recommendations.

Hardness after hardening is 51 HRC

HE AT ING ANNE AL ING T EMPER AT URE COOL ING

50 °C/h 710 - 740 °C 10 - 20 °C/h

Protect against oxidation, scaling and decarburisation. 2 hours. Slow in the furnace.

From 600 °C cooling in air is possible.

HE AT ING S T RE S S REL IE VING T EMPER AT URE COOL ING

100 °C/h 550 °C 20 °C/h

Protect against oxidation and decarburisation. 2 hours.

Slow and uniformly in the furnace to prevent formation of additional residual

stresses. Cooling in air is possible.

HE AT ING AUS T ENI T I S ING COOL ING

25 - 600 °C, 150-220 °C/h 600 - 830 °C, ≤150 °C/h 830 - 880 °C See CCT diagram

Hold in furnace at T = 600 °C until TSURFACE-TCORE ≤ 15 °C.

TSURFACE is measured at 15mm underneath surface, maximum soak time is 30 min.

If flame or induction hardening is used in pre-hardened condition slow cooling is necessary with immediate tempering.TIP 2 ←

H E A T T R E A T M E N T

RS

100

11

NOTES

Tempering must start immediately after completion of quenching (when part reaches 90-70 °C). Two tempering treatments are recommended. First tempering destabilizes retained austenite. Second tempering tempers newly formed microstructure constituents.

Tempering diagram

It is recommended to leave machining allowance before hardening of minimum 0.2 % of dimension, equal in all three directions.

HE AT ING T EMPERING T EMPER AT URE COOL ING

150 °C/h - 250 °C/h Min.180 °CCool in air or in the furnace to room

temperature between tempering cycles.Protect against oxidation and decarburisation.

1 hour per 25mm wall thickness based on the furnace temperature.

Minimum 2 hours.

If tool steel must be re-hardened, annealing should be done prior to hardening.TIP 3 ←

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T E M P E R I N G

D I M E N S I O N A L C H A N G E S D U R I N G H A R D E N I N G A N D T E M P E R I N G

Tempering temperature [°C], Time 1.5 h0 100 200 300 400 500 600 700

Hard

ness

in H

RC

40

55

50

60

45

35

30

65

70

H E A T T R E A T M E N T

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W E L D I N G

E L E C T R I C A L D I S C H A R G E M A C H I N I N G

RS 100 is a readily weldable alloy by TIG or MMA welding pro-cesses in hardened or soft-annealed condition. Filler metal should be of the same or similar composition.

Heat treatment after welding is recommended. Annealing should be performed after welding of soft annealed parts, whereas tempering at temperature of about 50°C below tem-pering temperature should be performed after welding of har-dened and tempered parts. Laser welding is recommended for repair of smaller cracks and edges.

Electrical discharge machining (EDM) leaves a brittle surface layer due to melting and resolidification of surface material.

It is recommended to: (1) remove the resolidified layer by polishing, grinding or other mechanical methods, and (2) temper the work-piece at temperature of about 50 °C below the previous tempering temperature. Execution of tempering of re-hardened and yet untempered layer underneath the surface is critical.

P R E H E AT I N G T E M P E R AT U R E M A X I M U M I N T E R PA S S T E M P E R AT U R E P O S T W E L D C O O L I N G

~250 °C ~300 °C Approximately 30°C/h to not less than 70°C, then tempering.

W E L D I N G M E T H O D F I L L E R M AT E R I A L H A R D N E S S A F T E R W E L D I N G

TIG, MMA P20-Type ~ 320 HB

* Risk of cracking because of sulphur addition.

W E L D I N G A N D E D M

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D R I L L I N G

F A C E M I L L I N G

T U R N I N G

The information below is provided solely as a general machining guideline. It refers to material in tempered condition.

I N S E R T D R I L L D I A M E T E R (mm)

C U T T I N G S P E E D (m/min)

F E E D (mm/rev)

HSS 5 - 20 20 0.05 - 0.35

Coated HSS 5 - 20 30 0.05 - 0.35

I N S E R T C U T T I N G S P E E D (m/min)

F E E D (mm/toot h)

D E P T H O F C U T (mm)

P20 c. (rough milling) 90 - 150 0.2 - 0.4 2.0 - 4.0

P20 c. (fine milling) 160 - 190 0.1 - 0.2 - 2.0

I N S E R T C U T T I N G S P E E D (m/min)

F E E D (mm/rev)

D E P T H O F C U T (mm)

P20 c. (rough turning) 150 - 190 0.20 - 0.4 2.0 - 4.0

P20 c. (fine turning) 200 - 240 0.05 - 0.2 - 2.0

HSS (fine turning) 20 0.05 - 0.3 - 2.0

* C - Coated carbide

R E C O M E N D A T I O N S F O R M A C H I N I N G

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S 10

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www.rsc.si

PL A STIC MOULD STEEL is produced by SIJ group | www.sij.si

• Metal Ravne | www.metalravne.com

• Acroni | www.acroni.si

PL A STIC MOULD STEEL is distributed by Ravne Steel | www.ravne steel.com

• Ravne Steel Center, Slovenia | www.rsc.si

• Sidertoce, Italy | www.sidertoce.com

• Ravne Steel Deutschland, Germany | www.ravnesteel.com