What kind of steel is used for plastic molds? How are alloy steels and structural steels divided?

Item: Part Name: Applicable Material: Applicable Hardness: HRC Hardness: Hardness: HRC1, Retaining Ring: S45C: 13, 21, 14, 28, 28, 35, 38

s55c 28~32 38~40

2 Injection Bushing S45C S50C S55C3 Static Die Fixing Plate S45C S50C S55C4 Static Die Holder S45C S50C S55C

5 Static mold cardioid type (female mold kernel) P20 30 35NAK80 35 45

fdac 40~44

h136 38~45 52~60

6 Moving mold cardioid type (male mold kernel) P20 30 35NAK80 35 45

fdac 40~44

h136 38~45

7 Moving die holder S45C, S50C, S55C

8 Backing Plate S45c S50c S55C

9 Foot pad (pillow foot) S45C S50c S55C10 Top plate S45C S50c S55C

11 Movable die fixing plate S45C S50C S55C12 Guide bush SK3 65MN 28 35 55 6513 Guide post SK3 65MN 28 35 28 35 35 Injection pin (thimble) 65MN 28 35 28 3514 SKD61 37 42 55 65

skd11 55~61 60~68

15 Blocking S45c S50c S55C

16 slider P20*718*618*S55C*S50C17 inclined pin SKD61*11

dh2f 38~42 58~62

18 Shuren SK3

19 Inserts, mold kernel beryllium copper 13 19 28 38 alloy steel alloy steel In addition to iron and carbon, other elements are added to the steel, which is called alloy steel.

Structural steel refers to steel that meets a specific grade of strength and formability. Formability is expressed in terms of elongation after the tensile test is interrupted. Structural steel is generally used for applications such as load-bearing, where the strength of the steel is an important design criterion.

Structural steel can be subdivided into: alloy structural steel, carbon structural steel, low-alloy structural steel, heat-resistant structural steel, and so on.

Plastic molds are generally made of P20 such as 718HH, 618HH, NAK80, 2738 and other pre-hardened ones, with a hardness between HB300-380.

H13 class such as 8702, 8407, SKD61, 2344, etc., the highest hardness after quenching is HRC52-54, if there is a requirement for corrosion resistance, S-136ESR is a good choice.

If you require mirror polishing, S-136ESR, 8407, POMAX are all good choices.

Introduction to commonly used steel for plastic molds (1) C45W medium carbon steel American standard number: AISI1050 1055;Japanese Standard Number: S50C S55C German Standard Number: .

Medium carbon steel or 45 steel Hong Kong is called ace steel, the hardness of this steel is: HB170 HB220, cheap, easy to process, used as a mold base, top column, and some unimportant parts on the mold, the general standard mold base on the market is used in this kind of steel.

2) 40crmnmo7 pre-hardened plastic mold steel in the United States, Japan, Singapore, Hong Kong, China standard number: AISIP20, Germany and some European countries code: din:.

This kind of steel is pre-hardened steel, generally not suitable for heat treatment, but can be nitrided, the hardness gap of this steel grade is also very large, by 280HRC 400 depending on the standard of the steel mill, because it has been pre-hardened, mechanical cutting is not too difficult, so it is very suitable to do some inserts of the lower price mold, some production of large quantities of mold mold base also use this steel (some customers specify to use this steel as the mold base), the advantage is that the hardness is higher than the medium carbon steel, and the deformation is more stable than the medium carbon steel, P20 steel is widely used in plastic molds, so there are many brands, among which the more common brands in South China are: ASSAB, Sweden has two different hardness, 718SHB290 HB330 (330 340HRC HHB330 HB370 (340 380HRC). Daido Steel Mill, made in Japan:

NAK80 (hardness 400HRC+20) and NAK55 (hardness 400HRC+20) two, in general, NAK80 as fixed mold inserts, NAK55 as moving mold inserts, it should be noted that NAK55 can not directly do EDM skin grain, according to the steel ** interpretation is the relationship of sulfur, so there are stripes left after EDM; Desheng Steel Mill Thyssen, made in Germany, has several numbers: GS-711 (hardness 340 360HRC), GS738 (hardness 320 350HRC), GS808VAR (hardness 380 420HRC), GS318 (hardness 290 330HRC), GS312 (hardness 290 330HRC), GS312 sulfur can not be EDM pattern, it is more common to do mold base in Europe, The code of GS312 is 40CrMnMOS8, which is made in Austria by Bailu (Bohler), and the numbers are: M261 (380 420HRC), M238 (360 420HRC), M202 (290 330HRC), M202 can not do EDM pattern, it is also sulfur-containing, and there are other brands, which cannot be recorded.

c) X40CRMOV51 hot work steel USA, China, Hong Kong, Singapore, standard number: AISIH13, DIN: (Europe); Japan SKD61, the factory hardness of this steel is:

HB185 HB230 shall be heat treated.

618 pre-hardened ordinary plastic mold comes from steel, which is mainly used for plastic molds of general requirements, and can be operated by electro-erosion.

718S and 718H pre-hardened high-quality plastic mold steel, mainly used for high-demand large and small plastic molds, and its electroerosion operation.

S136H pre-hardened anti-corrosion mirror plastic mold steel is mainly used for anti-corrosion and plastic molds requiring mirror polishing.

S136 anti-corrosion mirror plastic mold steel, mainly used for mirror molds, has high acid-proof after quenching, can ensure that the cooling pipe is not corroded, suitable for PVC, PP, EP, PC, PMMA plastics, food industry machinery components.

Junrui mould steel Kobayashi.

It's too much, depending on what you ask for.

X40CrMOV51 hot work steel, 40CrMnMo7 pre-hardened plastic mold steel, C45W medium carbon steel, etc. It has high hardness, strength, wear resistance, sufficient toughness, and high hardenability and hardenability.

1. X40CRMOV51 hot work steel, uniform material and good hardenability; Excellent machinability and polishing performance; High toughness and plasticity, good all-round properties; Good high and low temperature wear resistance; Good high temperature fatigue resistance, good heat resistance; The internal organizational structure is meticulous, which is better than that of conventional furnace steel.

2. X40CRMOV51 hot work steel, good toughness and ductility, excellent machinability and polishability, can resist temperature fusion and thermal stress fatigue, is stable in size after heat treatment, not easy to deform, and has excellent red hardness. 2344 steel is suitable for general metal die-casting, extrusion die, and casting die. PA, POM, PS, PE, EP plastic molds.

Hot work die steel is suitable for aluminum, zinc, alloy die casting molds.

3. 40crmnmo7 pre-hardened plastic mold steel is an abrasive alloy steel produced in Germany, which is used for camshafts and connecting rods.

Fourth, 40crmnmo7 pre-hardened plastic mold steel is produced by "ultra-pure" process and pre-hardened, showing a high degree of microscopic purity and excellent homogeneous structure, excellent polishability and photo-etching pattern. After heat treatment, the processing and polishing performance is good, nitriding treatment can be carried out, suitable for chrome plating and other surface treatment, the material hardness is uniform (to 400mm thick), good toughness, good machining performance. The gold structure is martensite and bainite structure.

5. C45W steel is a medium carbon steel, which is cheap and easy to process, and is suitable for surface hardening treatment such as high-frequency induction heating and quenching.

1. Mould steel is a steel grade used to make cold stamping dies, hot forging dies, die-casting dies and other molds.

2. Mold is the main processing tool for manufacturing parts in industrial sectors such as machinery manufacturing, radio instruments, motors, and electrical appliances. The quality of the mold directly affects the quality of the pressure processing process, the accuracy output of the product and the production cost, and the quality and service life of the mold are mainly affected by the mold material and heat treatment in addition to the reasonable structural design and processing accuracy.

There are NAK80, S136, 718, 2083 molds and so on--Jiangsu Wensheng Metal.

Plastic mold steel: also known as plastic mold steel, it is mainly used for plastic forming molds. Plastic molds are in the first place in mold making.

There are many classifications of plastic mold steel, mainly including: pre-hardened plastic mold steel, age-hardening mold steel, corrosion-resistant mold steel, free-cutting mold steel, martensitic aging plastic mold steel, and mirror-polished plastic mold steel.

The commonly used steels for plastic molds are: 2311 mold steel, P20 mold steel, 738H mold steel, 718H mold steel, NAK80 mold steel, 2083 mold steel, S136 mold steel, breathable steel PM-35.

It is roughly divided into: pre-hardened ordinary plastic mold steel, pre-hardened high-quality plastic mold steel, pre-hardened high-hardness mirror plastic mold steel, pre-hardened anti-corrosion mirror plastic mold steel, and anti-corrosion mirror plastic mold steel. If you talk about the model, it's more.

For example, Sweden ASSAB 618, 718S, 718H, etc., Germany Saarstahl GS638, GS2311, GS2711, GS2738, etc., as well as Austria, Japan, the United States, etc. I won't list them one by one, you can go to the website of the company that makes mold steel, such as: Junrui mold steel.

p20（p20h）

Feature Applications. High hardness, high finish and wear resistance, suitable for, ABS plastic molds.

Sweden ASSAB S136H

Feature Applications. High purity, high mirroring, good polishing performance, excellent anti-rust and anti-acid ability Suitable for mirror molds, high acid-proof, can ensure that the cooling pipe is not corroded Suitable for PVC PP, EP, PC, PMMA plastics, food industry machinery components.

Sweden 1300 718h

Feature Applications. Due to the high hardness, better polishing, better wear resistance, higher tensile strength and compressive strength are suitable for use when leaving the factory.

High polishing degree and high requirements of internal molds, suitable for PA, POM, PS, PE, PP, ABS plastics.

Japan nak80

Feature Applications. High hardness, excellent mirror effect, good electrical discharge machining, excellent welding performance, suitable for electroerosion and polishing.

Can mold. Sweden 1 Sasab S136

Feature Applications. It is suitable for mirror molds, and has high acid-proof properties after quenching, which can ensure that the cooling pipe is not corroded and suitable for PVC, PP, etc

EP, PC, PMMA plastics, machinery components for the food industry.

German JS2738

Feature Applications. The steel is made of nickel, the hardness is uniform, the cutting is good, and it is especially suitable for high-demand plastic molds.

Electroerosion operation of high-toughness plastic molds.

German JS2316

Feature Applications. High chromium stainless steel, pre-hardened, excellent corrosion resistance, good polishing and cutting easy to reach the mirror effect, suitable.

Acid-proof mold steel for transparent and mirror products, suitable for PVC, POM, etc.

Swedish 618 characteristic application.

Acid-proof die steel, suitable for the production of PS, SAN, etc.

German JS2311

Feature Applications. Plastic molds are generally required.

German JS2083

Feature Applications. Acid-proof die steel, suitable for the production of PS, SAN, etc.

German JS2379

Feature Applications. Good quenchability, small heat treatment deformation, wear resistance and impact resistance. It is suitable for cold extrusion forming, drawing dies and punching dies.

Precision stamping dies, high-hardness material punching dies.

Sweden 1szab 8407

Feature Applications. Hot mold steel, high temperature toughness, wear resistance, heat resistance is excellent, suitable for metal die-casting, extrusion mold, casting mold, PA, POM, PS, PE, EP plastic mold.

German JS2344

Feature Applications. All kinds of cold molds, forming rolls, scissors, cold pressing tools with complex shapes, plastic molds, etc.

Japan SLD (SKD11).

Feature Applications. All kinds of cold molds, forming rolls, scissors, cold pressing tools with complex shapes, plastic molds, etc. Aluminum, magnesium-zinc alloy die-casting molds.

Japan DAC (SKD61).

Feature Applications. High polish and high requirements of internal molds, suitable for PA, POM, PS, PE, PP, ABS plastics. Plastic molds are generally required.