Mold Steel for Plastic with Corrosion Resistance and Mirror finish-ability

FM ALLOY®

PROVA Series
The PROVA series are high quality stainless steelsthat are the best for molds on plactic molding.
• Excellent mirror finish-ability.
• Good machinability.
• Superior corrosion resistance.
• Good wear resistance.
• Small deformation by heat treatment.
• Materials can be provided as already hardened(32HRC).

Polishing Property
Schematic diagram

PROVA-500

Hardness (HRC)60

8Cr grade

50

PROVA-450 PROVA-400

P21 grade
40
30

PROVA-400, 450(Already hardened)

P20 grade

20
100S55C0Better
5,000

10,00015,000Mirror polishability (Grain mesh)

Steel GradeGradeMirror ﬁnish-ability

Corrosion resistance

Wear resistance

CostPROVA-400

◎

○○

○

PROVA-450○○○◎

PROVA-500

○○

◎

△

Applications●Corrosion Resistance ......... Mold for plastic with fire-retarding material or PVC which are strongly corrosive●Wear Resistance ....................... Mold for thermo-setting resin or plastic with glass fiber●Mirror Finish-ability ................ Mold for transparent plastics which are used for optical or medical devices●Rigidity ................................................... Mold for high-pressure plastic injection (PROVA-500)

PROVA Series

Mold Steel for Plastic with Corrosion Resistance and Mirror ﬁnish-ability

Corrosion weight loss ratio

1.0

0.8

0.6

0.0

PROVA-400

0.8

0.6

0.4

Better0.2

1.00.2↑Better

0.4↑

Corrosion weight loss ratio

Corrosion Resistance

0.0

Other maker’s grade A Other maker’s grade B

PROVA-500

Test reagent: 5% sulfuric acid Temperature: 40˚C Immersion time: 5hrs

SUS440C

8Cr grade

Test reagent: 10% sulfuric acid Temperature: 40˚C Immersion time: 4hrs

Heat Treatment Condition
HardeningGradeTempering

Pre-heat (˚C)

Austenitizing (˚C)

PROVA-400

600〜850

1000〜1050

PROVA-450

600〜850

1000〜1050

PROVA-500

820〜860

1070〜1120

Demand properties

Temperature (˚C)

Hardness (HRC)

200〜400

51〜53

Corrosion resistance / Low age-deformation

490〜510

51〜53

Avoid breaking at electric discharging

200〜400

51〜53

Corrosion resistance / Low age-deformation

490〜510

51〜53

Avoid breaking at electric discharging

150〜200

60UP

Corrosion resistance / Low age-deformation

500〜550

58UP

Avoid breaking at electric discharging

65

PROVA-500：Austenitizing 1080˚C

Hardness (HRC)

60
5550

PROVA-400,450：Austenitizing 1030˚C45

PROVA-400,450
PROVA-500

4035As
焼入れのまま150250

quenching350

450550Tempering temp. (˚C)

Unauthorized reproduction of these materials is prohibited.
● Information in this catalog may be changed without prior notice due to technical advancements or product developments. While care has beentaken to produce these materials, NACHI Fujikoshi accepts no responsibility for damages caused by misprints or omissions that may occur during
the publication of this catalog.
● Please note that the characteristics and values provided here are typical examples which may differ from the characteristics of the actual product.

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那智不二越（上海）贸易有限公司

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CHINA Tel: +86-(0)21-6915-2200 Fax: +86-(0)21-6915-5427
A/9A, Sector-16, Noida-201301, Distt. Gautam Budh Nagar, U.P. INDIATel: +91-120-4272257 Fax: +91-120-4272256

Shiodome Sumitomo Bldg. 17F 1-9-2 Higashi-shinbashi, Minato-ku, Tokyo
105-0021, JAPAN Tel: +81-(0)3-5568-5242 Fax: +81-(0)3-5568-5292

CATALOG NO.

S4311E2010.09.Z-ABE-ABE