Ruey Chyi

Injection Mold & Molding Manufacturer
There are six groups of tool steels: water-hardened, cold-worked, shock-resistant, high-speed, hot-work, and special purpose. The choice of group to select depends on cost, working temperature, required surface hardness, strength, shock resistance, and toughness requirements. The more severe the service condition (higher temperature, abrasiveness, corrosiveness, loading), the higher the alloy content and consequent amount of carbides required for the tool steel. Tool steels are used for cutting, pressing, extruding, and coining of metals and other materials. Their use, such as the production of injection molds, is essential, due to their resistance to abrasion, which is an important criterion for a mold that will be used to produce hundreds of thousands of moldings of a product or part.

Classification Of Plastic Mold Steels

Steel Classification

Standard

 

Assab

Bohler

Edelstahl Buderus

Thyssen

Hitachi

DIN

JIS

AISI

Plastic Mould Steel

1.1203

SUS 420 J2

1055

 

CK 55

SCS 2

1.2311

P20

 

718

W330

2311 iso BM

2311

1.2312

P20+S

 

Holdax

M200

2312

2312

1.2738

P20+Ni

 

Impax

2738

1.2316

 

RaMaxS

M300

2316

1.2083

420

 

Stavax

M310

2083

2083

1.2085

420+S

 

M304

21 MnCr 5

1.2162

 

Prexi

M100

2162

 

Hot Work Steel

1.2344

SKD 61

H13

 

8407

W302

2344 ISO B

2344

DAC

1.2714

SKT 4

L6

 

SOMDIE

W500

2714

2714

DM

1.2367

 

QRO90

W303

2367 ISO B

2367

1.2767

 

Grane

K600

X45CrNiMo4

 

Cold Work Steel

1.1545

SK 4

W110

 

UHB20

K990

C105W1

1545

SK4

1.2436

 

Sverker 3

K107

X210CrW12

2436

1.2510

SKS 3

O1

 

DF2

K460

2510

2510

SGT

1.2363

SKD 12

A2

 

XW40

K305

2363

2363

SCD

1.2379

SKD 11

D2

 

XW41

K110

2379 ISO B

2379

SLD2

1.2550

SKS 41

S1

 

M4

K455

2550

2550

1.2842

O2

 

Aros

K720

90MnCrV3

2842

How to choose plastic injection mold steel?

A complete set of injection mold have a variety of parts, each part of the mold pays different role and the steel to use are different as well. Choosing the proper mold steel can ensure high quality mold, efficiency and lowest cost. There are some basic principles to follow when you choose steel for injection mold.

Machining Properties

Most of the mold making jobs are done by machining, ease of machining can shorten the manufacturing time. Also good machining properties can extend the life of cutting tools, improve cutting performance, reduce surface roughness to get high precision parts.

Hardness and wear resistance

Surface roughness, dimensional accuracy of plastic parts and injection mold life heavily rely on the surface hardness and wear resistance of mold steel. Therefore, plastic injection molding surface of the mold requires sufficient hardness, the hardness after quenching should be not less than 55 H RC.

Strength and toughness

During plastic injection molding process, the mold plates stand hundreds of thousands of clamping pressure, especially big-sized and complicated structure injection molds, the mold steel used must have high strength and good toughness to performance well.

Polishing properties

To get high glossy plastic parts, the mold cavities required a high glossy surface, the mold steel should not have holes, impurities and other defects after polishing, steel S136, H13 etc has very good polishing properties.

Heat treatment

The mold steel often needs heat treatment process to achieve the necessary hardness, so the steel requires good heat treatment properties. Plastic injection mold cavities has complex design usually, it gets more difficult to process after quenching, or sometimes it just simply can not be processed. So choose proper mold steel that has less deformation after heat treatment to ease manufacturing.

Good corrosion resistance

Some plastics and additives will produce corrosive gases during injection molding, mold steel selected should resist to corrosion. For example, the PVC materials, mold steel have to be S136. You can also employ nickel, chromium and other methods to improve the corrosion resistance of mold cavities. >>>Want To Know How Make a Mold<<<
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