Plastic Mold Steel

SIMOLD Plastic Mold Steel

Name: SIMOLD Plastic Mold Steel
Brand: SIJ Metal Ravne

SIJ brand for plastic mold steel

SIMOLD Plastic Mold Steel from SIJ Metal Ravne is intended for molds for plastics, synthetic resins and rubber, with Q+T, sulfur-alloyed and corrosion-resistant grades for tools exposed to pressure, wear and corrosion.

Manufactured bySIJ Metal Ravne · HTS Group

CNC milling of a mold cavity in a steel mold block — Machining a SIMOLD mold block.

HB 280–325Q+T supply hardness, 2311

55–57 HRCAchievable hardness, 2083

> 12% CrCorrosion-resistant grades

Ø1,000 mmRound bars up to

2,500 mmPlate width up to

Overview

Mold steel for plastics, resins and rubber

SIMOLD tool steel is intended for the manufacture of molds for plastics, synthetic resins and rubber molding. It is produced by SIJ Metal Ravne and distributed and serviced by HTS Group / Ravne Steel Center.

Sulfur-alloyed SIMOLD grades are used for backing parts of plastic injection molding tools because sulfur improves machinability. Grades alloyed with more than 12% chromium are classified as corrosion-resistant tool steels.

The steel suits tools exposed to pressure, wear and corrosion, in industries where long tool life, stable dimensions and consistent mold performance are required.

Grades

Main SIMOLD grades

1.2083

SIMOLD 2083

Corrosion-resistant mold steel, Cr above 12%, also in remelted / ESR version.

Supply hardness: HB max. 230
Achievable hardness: 55–57 HRC

1.2083, remelted

SIMOLD 2083R

Remelted version of 2083 for higher cleanliness and mold performance.

Supply hardness: HB max. 230
Achievable hardness: 55–57 HRC

1.2085

SIMOLD 2085

Corrosion-resistant mold steel with improved machinability.

Condition: Q+T
Supply hardness: HB 280–325
Achievable hardness: 45–51 HRC

1.2099

SIMOLD 2099

Condition: Q+T
Supply hardness: HB 280–330
Achievable hardness: 36–38 HRC

1.2311

SIMOLD 2311

Common mold steel for injection molding and mold bases.

Condition: Q+T
Supply hardness: HB 280–325
Achievable hardness: 52 HRC

1.2312

SIMOLD 2312

Sulfur-alloyed for easier machining.

Condition: Q+T
Supply hardness: HB 290–325
Achievable hardness: 51 HRC

1.2316

SIMOLD 2316

Corrosion-resistant mold steel for molds exposed to corrosion risk.

Condition: Q+T
Supply hardness: HB 285–320
Achievable hardness: 49 HRC

1.2738

SIMOLD 2738

Nickel-alloyed for better through-hardening in larger molds.

Condition: Q+T
Supply hardness: HB 290–325
Achievable hardness: 52 HRC

1.2738HH

SIMOLD S131

Custom grade for larger tool dies with more uniform hardness distribution.

Condition: Q+T
Supply hardness: HB 310–360
Achievable hardness: 52 HRC

Custom remelted grade

SIMOLD S150R

Maraging steel option for plastic mold applications.

Working hardness: 40–42 HRC

Steel Types

Grades by steel type

Hardening and tempering steels

SIMOLD 2311, 2312, 2738, S131 and S133.

Corrosion-resistant steels

SIMOLD 2083, 2085 and 2316.

Maraging steel

SIMOLD S150R.

Applications

Where SIMOLD is used

Plastic injection molds

Cavities, cores, mold frames and backing plates for injection molding.

Car headlight with clear plastic lens on a dark background

Automotive plastic components

Molds for automotive plastic parts, including transparent parts depending on grade and polish.

Rubber and resin molds

Compression, rubber and synthetic resin molds.

Large plastic mold dies

Through-hardening grades for large molds and tool dies.

Compression moldsExtrusion insertsDiesMold framesMold backing platesHousehold appliance moldsPackaging moldsIndustrial plastic part moldsTools exposed to corrosion

Features

Properties and product range

Properties

Good steel purity and polishability.
Good machinability; sulfur-alloyed grades for easier machining.
Good temperature resistance, dimensional stability and wear resistance.
Corrosion-resistant grades with more than 12% Cr.

Large molds

SIMOLD S grades offer improved through-hardenability.
More uniform hardness distribution in larger tools.
Custom-made grades for larger mold dies.

Product forms

Plates 15–100 mm thick, 1,000–2,500 mm wide, 4,000–12,000 mm long.
Square sections up to 1,000 mm; flat sections up to 1,500 × 600 mm.
Round bars up to Ø1,000 mm; forgings, welding wire and electrodes.
HTS service centre: bars up to Ø700 mm, blocks up to 600 × 1,600 mm, plates up to 300 × 2,000 mm.

Benefits

Why SIMOLD for molds

Longer mold life. Good wear resistance under production pressure extends mold lifetime.

Polished surfaces. Good polishability for high-quality plastic surfaces.

Easier mold making. Good machinability for mold production.

Corrosion protection. Corrosion-resistant grades for aggressive plastics and humid or corrosive molding conditions.

Large mold options. Through-hardening and SIMOLD S grades support uniform hardness in larger tool dies.

Grade selection support. HTS technical support helps match the SIMOLD grade to mold material, size and application.

Need support with this mold steel?

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Performance Engineering Section

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