Plastic Molds

1.1730

UNI EN ISO 4957

Description

Characteristics

Surface hardenable tool steel with hard surface and tough core. Used for cold heading dies, top and bottom plates for plastic die casting, die casting tools, hand tools, tongs, agricultural tools, blanking tools, leather knives.

pdf Scheda-1.1730.pdf PDF 226.69 Kb

Supply conditions

Annealed to max 207 HB

Heat treatment

Annealing

Heat to 680-710 C
Furnance cooling

Stess relieving

Heat to 600-650 C
Furnance cooling

Hardening

Preheating 600-650 C
Heat to hardening temperature 800-830 C and hold at temperature
Cooling in water
Hardness after quenching: HRC 57

Tempering

To be carried out after hardening in the range of 300-350 C for 1 hour for 20mm of thickness min 2 h

Comparable standards

UNI	W.Nr	DIN	AFNOR	AISI/SAE	BS
C45U	1.1730	C45U	XC48	~1045	-

Chemical analysis

C	Si	Mn	P	S
0.42>0.50	0.15>0.40	0.60>0.80	<=0.030	<=0.030

Critical points

Ac1	Ms
730 C	340 C

VR Holder

UNI EN ISO 4957

Description

Characteristics

Contact to order

It is a chromium-molybdenum steel that gives good hardness penetration and ensures uniform hardness and high strength for toughness, ductility and wear resistance. The Sulphur content improves machinability.

pdf Scheda-VR-HOLDER-Plastic-mould-steel.pdf PDF 330.42 Kb

Supply conditions

Hardened and Tempered Normal HB 280-320

Heat treatment

Forging

1150-900 C

Hardening

830-880 C

Tempering

To be carried out after hardening in the range 550-650 C

Comparable standards

UNI	W.Nr	DIN	AFNOR	AISI/SAE	BS
~42CrMo4	1.7225	~42CrMo4	~42CD4	~4140	~708A42

Chemical analysis

C	Mn	Si	P	S	Cr	S
0.35	0.75	0.15	-	0.020	0.80	0.15
0.40	1.00	0.30	0.035	0.040	1.10	0.25

Critical points

Ac1	745 C
Ac3	790 C
Ms	300 C

1.2311

UNI EN ISO 4957

Description

Characteristics

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Steel with excellent hardening penetration up to 400 mm. Generally supplied in hardened and tempered condition with excellent polishing and photoengraving properties. This steel is suitable for nitriding (around 800 HV), chrome and nickel plating. Used for plastic dies with excellent surface finish properties. It is also used for dies of light alloys with low melting point, plates, dies box, etc.

pdf Scheda-1.2311.pdf PDF 304.56 Kb

Supply conditions

Hardened and Tempered Normal HB 280-325 (950-1100 N/mm)

Heat treatment

Annealing

Heat to 720-750 C for 2-4 h furnace cool

Stess relieving

Up to 560-600 C, hold for 2-4 h
Furnace or steel air cooling

Hardening

Preheating to 600-650 C
Heat to hardening temperature to 840-870 C and hold at temperature
Cooling in oil
Hardness after hardening: HRC 51

Tempering

To be carried out soon after hardening in the range 580-650 C for 1 hour for 25 mm of thickness min 2h
Cooling in the air

Comparable standards

UNI	W.Nr	DIN	AFNOR	AISI/SAE	BS
-	1.2311	X40CrMnMo7	40 CMD8	~P20	~P20

Chemical analysis

C	Mn	Si	Cr	Mo	Ni	P+S
0.35	1.30	0.20	1.80	0.15
0.45	1.60	0.40	2.10	0.25		0.030

Critical points

Ac1	Ms
740 C	310 C

1.2312

UNI EN ISO 4957

Description

Characteristics

Contact to order

Steel with good hardening penetration and good tool workability, also in hardened and tempered condition, thanks to the high level of sulphur. The main application is for plastic material dies also in large sizes, on condition that surface finish properties are not too excessive. It is also used for plates, dies box, dies of light alloys with low melting point. It is steel suitable for nitriding (around 800 HV) and chrome plating

pdf Scheda-1.2312.pdf PDF 301.87 Kb

Supply conditions

Hardened and Tempered Normal HB 278-325 (950-1100 N/mm)

Heat treatment

Annealing

Heat to 720-750 C for 2-4 h furnace cool

Stess relieving

Up to 560-600 C, hold for 2-4 h
Furnace or steel air cooling

Hardening

Preheating to 600-650 C
Heat to hardening temperature to 840-870 C and hold at temperature
Cooling in oil
Hardness after hardening: HRC 51

Tempering

To be carried out soon after hardening in the range 580-650 C for 1 hour for 25 mm of thickness min 2h

Comparable standards

UNI	W.Nr	DIN	AFNOR	AISI/SAE	BS
-	1.2312	X40CrMnMo8-6	40 CMD8S	P20	-

Chemical analysis

C	Mn	Si	Cr	Mo	S	P+S
0.35	1.30	0.30	1.80	0.15	0.05
0.45	1.60	0.50	2.00	0.25	0.10	0.030

Critical points

Ac1	740 C
Ms	310 C

VR 16

UNI EN ISO 4957

Description

Characteristics

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VR16 is a Pre-hardened stainless martensitic ChromeMolybdenum steel with excellent toughness, good polishability, improved machinability and excellent resistance to corrosion.

Main benefits of steel with excellent corrosion resistance are:

Lower mould maintenance cost
Higher production performance due to the lower production cost (cooling channels are not affected by corrosion)

Applications:

plastic moulds.
particularly for corrosive plastic as PVD
dies for plastic extrusion
mould for household appliances

Supply conditions

VR16 is delivered in quenched and tempered condition:

VR16, Standard version: hardness range 280 - 325 HB (29 – 35 HRC)
VR16HH, High hardness: hardness range 350 - 390 HB (38 – 42 HRC)

Heat treatment

Annealing

Temperature: Heat to 770 - 820 °C
Holding time (HT): Min. H.T. for 2 minute /mm
Cooling: Furnace up to 600°C than in air
Comments: -

Stess relieving

Temperature: Heat to 550 - 600 °C
Holding time (HT): Min. H.T. for 2 minute /mm
Cooling: Air or furnace
Comments: To be carried out after machining, is recommended to eliminate the residual stresses induced by mechanical working

Hardening

Temperature: Preheating to 600-700°C. Austenitizing to 990 - 1040 °C
Holding time (HT): Min. H.T. for 1 minute /mm
Cooling: Polymer or gas air
Comments: Qunched hardness 50 HRC

Tempering

Temperature: -
Holding time (HT): -
Cooling: Air
Comments: To be carried out after hardening. 2nd Tempering must be performed to max 30°C below tempering temperature

Chemical analysis

C	Mn	Si	Cr	Mo	Ni	P	S
0.28	0.9	0.30	14	1	0.7	0.008	0.003

VR 200

UNI EN ISO 4957

Description

Characteristics

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VR200 is a prehardened plastic mold steel with hardening penetration up to 600mm, for medium size molds and tool with excellent machinability .

To be used for plastic dies with excellent surface finish properties, compression moulding, plastic injection moulds core and cavities, moulds for automotive industry with texturing.

VR200 is designed to provide improved performance and offer the following advantages:

uniform hardness across the full thickness up to 600 mm.
good polishability
good machinability
good suitability for texturing
good toughness

pdf Scheda-VR200-Plastic-mould-steel.pdf PDF 308.48 Kb

Supply conditions

VR200 is delivered in quenched and tempered condition:

VR200, Standard version: hardness range 290 - 320 HB (30 – 34 HRC)
VR200HH High hardness: hardness range 320 - 350HB (34 – 38 HRC)

Heat treatment

Annealing

Temperature: Heat to 650 - 700 °C
Holding time (HT): Min. H.T. for 2 minute /mm
Cooling: Air or furnace
Comments: In order to obtain hardness lower than 250 HB ( 24 HRC) to improve machinability

Stess relieving

Temperature: Heat to 500 - 550 °C
Holding time (HT): Min. H.T. for 2 minute /mm
Cooling: Air or furnace
Comments: To be carried out after machining, is recommended to eliminate the residual stresses induced by mechanical working

Hardening

Temperature: Heat to 860 - 900 °C
Holding time (HT): Min. H.T. for 1 minute /mm
Cooling: Polymer
Comments: -

Tempering

Temperature: Heat to 530 - 610 °C
Holding time (HT): Min. H.T. for 3 minute /mm
Cooling: Air or furnace
Comments: To be carried out after hardening. 2nd Tempering must be performed to max 30°C below tempering temperature

Chemical analysis

C	Mn	Si	P	S	CR	Mo	Ni	B
0.27	1.30	Max 0.15	0.010	0.003	1.3	0.4	0.34	0.003

VR 300

UNI EN ISO 4759

Description

Characteristics

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Steel with excellent hardening penetration up to 700 mm. Generally supplied in hardened and tempered condition with excellent polishing and photoengraving properties. This steel is suitable for nitriding (around 800 HV), chrome and nickel plating.

pdf VR300.pdf PDF 538.6 Kb

Supply conditions

Hardened and Tempered Normal HB 280-325 (950-1100 N/mm)

Heat treatment

Annealing

Heat to 720-750 C for 2-4 hour furnace cool

Stess relieving

Up to 560-600 C, hold 2-4 h
Furnace or steel air cooling

Hardening

Preheating to 600-650 C
Heat to hardening temperature to 840-870 C and hold at temperature
Cooling in oil
Hardness after hardening: HRC 51

Tempering

To be carried out soon after hardening in the range 580-650 C for 1 hour for 25 mm of thickness minimum 2h

Comparable standards

UNI	W.Nr	DIN	AFNOR	AISI/SAE	BS

Chemical analysis

C	Mn	Si	Cr	Mo	Ni	P+S
0.35	1.30	0.20	1.80	0.15	0.60
0.45	1.60	0.40	2.10	0.25	0.70	0.15

Critical points

Ac1	730 C
Ms	330 C

1.2738

UNI EN ISO 4957

Description

Characteristics

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It features excellent hardening penetration, good workability, polishing and photoengraving properties. This steel is used for plastic moulds of medium and big size. It can be subject to a nitriding treatment to improve its wear resistance. Main applications: injections and thermoplastic extrusion moulds, rubber moulds, moulds carrier frames, containers.

Supply conditions

Hardened and Tempered Normal HB 300-340

Heat treatment

Annealing

Heat to 710-740 C, with hold at minimum rate for 3 hours
Slow furnance cooling to 600 C

Stess relieving

To be carried out after machining and before the final heat treatment
Heating to 530-580 C for 2h

Hardening

Preheating 500-550 C
Austenizing at 840-880 C
Oil or thermal bath cooling at 200-230 C, then oil cooling according to the steel shape size
Quenched hardness 52-54 HRC

Tempering

To be carried out after hardening and when the steel is at 60-80 C, at 500-600 C according to the required hardness and with permanence for at least 2h
Cooling in the air

UNI	W.Nr	DIN	AFNOR	AISI/SAE	BS
-	1.2738	40CrMnNiMo8-6-4	~40 CMND8	~P20 + Ni	~P20 + Ni

Chemical analysis

C	Mn	Si	Cr	Mo	Ni	P+S
0.35	1.30	0.20	1.80	0.15	0.90
0.45	1.60	0.40	2.10	0.25	1.20	0.030

Critical points

Ac1	Ms
710 C	290 C

VR 400

UNI EN ISO 4957

Description

Characteristics

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VR400 is a prehardened steel to be used for plastic injections moulds, compression moulds, etc, offering improved performance for the mould makers as well as the mould user. VR400 is designed to provide an improved machinability andfinishing operations like polishing and chemical etching.

Supply conditions

Hardened and Tempered Normal HB 360-390 (aiming at 380)

Heat treatment

Annealing

Heat to 600-650 C and hold at minimum rate for 1 hour per inch
Furnace cooling

Stess relieving

To be carried out after machining and before the final heat treatment
Heat to 550-600 C for 1 hour per inch

Hardening

Austenitizing at 860-880 C for 30 minutes per inch
Cooling in polymer
Quenched hardness: 48-52 HRC

Tempering

To be carried out soon after hardening
Heat to 560-600 C for 1 hour per inch
To achieve maximum stability and release tension,tempering must be repeated 30C less than first

Comparable standards

UNI	W.Nr	DIN	AFNOR	AISI/SAE	BS

Chemical analysis

C	Mn	Si	Cr	Mo	Ni	V	P+S
0.25	1.40		1.20	0.55	1.00	0.10
0.35	1.60	0.10	1.40	0.75	1.20	0.15	0.015

Critical points

Ac1	730 C
Ms	330 C

1.2083

UNI EN ISO 4957

Description

Characteristics

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Stainless martensitic steel with a high hardenability, good polishing properties, excellent resistance to corrosion and hot oxidation. Its applications are plastic moulds, particularly for acid aggressive plastics (i.e. acetate and PVC), or plastics containing abrasive fillers. Suited for the manufacture of glass, such as moulds of optical products.

Supply conditions

Annealed HB < 241

Heat treatment

Annealing

Heat to 845-870 C and hold at minimum rate for 3 hours
Coling up to 600 C and hold at minimum for 3 hours
Furnace cooling

Stess relieving

To be carried out after machining and before the final heat treatment
Heat to 600-650 C for 2 hours, furnace cooling

Hardening

Preheat to 600-700 C
Austenizing at 1000-1050 C in oil, considering the steel shape and size
Cooling in oil, air
Quenched hardness: 52-56 HRC

Tempering

To be carried out after the hardening according to the required hardness; at 170-270 C in order to match hardness and resistance to corrosion; permanence for at least 2 hours; tempering must be repeated at least twice at a temperature 30 C lower than the previous.
Cooling in the air

Comparable standards

UNI	W.Nr	DIN	AFNOR	AISI/SAE	BS
X42Cr13	1.2083	X40Cr14		420 C

Chemical analysis

C	Mn	Si	Cr	P+S
0.36			12.50
0.42	1.00	1.00	14.50	0.030

Critical points

Ac1	Ms
840 C	260 C

1.2085

UNI EN ISO 4957

Description

Characteristics

Contact to order

Martensitic stainless steel for high machinability chromium nickel + sulphur with excellent corrosion resistance, higher than similar Cr grades (i.e. 2083) characterized by excellent workability derived from the addition of sulphur. Holder is used for plastics or where equipment needs to be stainless steel with excellent workability and excellent resistance to corrosion and / or the presence of abrasive additives.

pdf Scheda-1.2085.pdf PDF 320.93 Kb

Supply conditions

Annealed HB 241
Hardened and Tempered HB 270-320

Heat treatment

Annealing

Heat to 850-880 C with hold at minimum rate 1 hour to 25 mm thickness
Furnace cooling

Stess relieving

To be carried out after machining and before the final heat treatment
Heating to 590-650 C 1 hour for 50 mm thickness

Hardening

Austenitizing at 1000-1050 C 1 minute per mm thickness of the workpiece
Cooling in the air
Quenched hardness 55 HRC

Tempering

To be carried out soon after hardening according to the request hardness; permanence for at least 2 hours; tempering must be repeated at least twice at temperature 30 C lower than previous
Cooling in the air

Comparable standards

UNI	W.Nr	DIN	AFNOR	AISI/SAE	BS
-	1.2085	~X33Crs16	~Z 33CS16	~442+S

Chemical analysis

C	Mn	Si	Cr	Mo	Ni	P	S
0.28	<	<	15.00		<	<	0.05
0.38	1.40	1.00	17.00		1.00	0.030	0.10

Critical points

Ac1	790 C
Ms	190 C

VR Stainless

UNI EN ISO 4957

Description

Characteristics

Contact to order

Martensitic stainless steel with very good machinability and corrosion resistant. As holder, it is used for plastic and rubber molds.

pdf Scheda-VR-Stainless-Plastic-mould-steel-updated-200902.pdf PDF 243.52 Kb

Supply conditions

Annealed HB 290-320

Comparable standards

UNI	W.Nr	DIN	AFNOR	AISI/SAE	BS

Chemical analysis

C	Mn	Si	P	S	Cr	Mo
-	1.00	-	-	0.10	12.00	-
0.08	1.10	0.40	0.030	0.12	12.50	0.40

Critical points

Ac1	790 C
Ms	190 C

1.2316

UNI EN ISO 4957

Description

Characteristics

Contact to order

Stainless martensitic molybdenum-chrome steel with excellent resistance to corrosion, higher than similar Cr grades (i.e. 2083), good polishing and photoengraving properties. Its application are equipments and plastic moulds, particularly for corrosive plastic and /or for the presence of abrasive additives.

pdf Scheda-1.2316.pdf PDF 327.3 Kb

Supply conditions

Annealed HB 240
Hardened and Tempered Normal HB ~280-325

Heat treatment

Annealing

Heat to 770-820 C with hold at minimum rate 3 hours
Furnace cooling to about 600 C

Stess relieving

To be carried out after machining and before the final heat treatment
Heating at 600-650 C for 2 hours

Hardening

Preheating to 600-700 C
Austenitizing at 1000-1054 C
Cooling in the air, thermal bath at 500-550 C, according to the steel shape and size
Quenched hardness 42-49 HRC

Tempering

To be carried out soon after hardening according to the requested hardness; permanence for at least 2 hours; tempering must be repeated at least twice at temperature 30 C lower than previous
Cooling in the air

Comparable standards

UNI	W.Nr	DIN	AFNOR	AISI/SAE	BS
-	1.2316	~X36CrMo17	~Z 35CD17	~442	-

Chemical analysis

C	Mn	Si	Cr	Mo	Ni	S	P
0.33	<	<	15.50	0.85	<	<	<
0.45	1.50	1.00	17.50	1.30	1.00	0.03	0.03

Critical points

Ac1	790 C
Ms	240 C