The chemical name of A8 high toughness die steel

1. Introduction of A8 improved steel materials:

A8 improved steelThe modified steel grade of A8 steel in ASTM A681 has good hardenability, toughness, and dimensional stability of heat treatment.

Second, A8 improved steel material use:

A8 modified steel is suitable for punches and cold forging dies with a hardness of 55 - 60 HRC. It can also be used to make non-metallic tool materials.

3. Chemical composition:

c：si：mn：cr：

mo：v：

A8 is not a regular mold steel grade, some small companies do not have the best and inventory advantages, worried about the loss of customers, in the initiative to develop customers when using the host to prepare the grade, once the customer uses the material, it is difficult to find it in the market. However, there are also super-large companies that directly list their steel from smelting enterprises according to their functions and roles and alloying elements in the first and information for customers to choose, but the company must be an influential brand company, otherwise no one wants.

The A8 mentioned in the question should be a domestic SKD11, which is a chemical element.

Yes: c si mn cr mo v

The above elements are on the Internet, and there is no actual basis, you can get the mold steel company is to test it, and you will know.

A8 is the American Fincola high toughness and wear-resistant tool steel, which is a wind-hardened steel. China's general manager in the Yangtze River Delta region by Suzhou Donghe Special Steel. The mass fraction of carbon of the steel is about 1%, the hardness of Zhidao can reach 57 62HRC after heating, the mass fraction of chromium is about 5%, the surface gloss of the steel is dark after grinding, the corrosion resistance is excellent, the ductility is very strong, and the damage resistance of the die edge is good.

The steel has good hardenability, uniform carbide distribution, certain impact and good wear resistance. It has good air quenching performance, small weight size deformation after air quenching, uniform and fine carbide, and good wear resistance.

A8 Mold Steel Chemical Composition:

C: A8 mold steel.

si：mn：

cr：mo：v：

A8 steel is a type of high-toughness die steel. Because it has high toughness, it can be used as a punch.

The material parameters of A8 steel are as follows:

1. Chemical composition of A8 die steel:

c si mn cr mo v

2. A8 material use:

1) It is suitable for making complex shapes or precision stamping dies, and (2) it is suitable for making cold work dies for wire cutting processing.

3) Screw hobbing die, deep drawing forming die, stainless steel plate stamping die (4) high-speed blank punch, cold forging die.

5) It is suitable for making long-life wear-resistant woodworking tools.

3. A8 steel characteristics:

1.The toughness is twice as high as that of SKD11 cold work steel, and the resistance to cracking and cracking of the tensile die is greatly improved when making complex dies.

2.The mold is tempered at 520-530 high temperature, and the hardness is still 61-63HRC, which reduces the risk of cracking accidents caused by residual stress in the wire cutting mold.

3.It is suitable for surface hardening treatment, so that the life of the mold is greatly improved.

4. Delivery condition: softened annealing to 235HB.

5Cr5MowSi is A8 steel, which can be used for forging, as well as for stamping dies. A8 steel is a good steel, a bit expensive.

The commonly used grades of high-strength and toughness cold-made die steel are, D2, DC53, etc.

The commonly used grades of high strength and toughness cold work die steel are: DC53, VIKING, ASP23, ASP60, SKH-9

Matrix steel has high hardness and toughness, this steel not only has the high strength and high hardness of high-speed steel, but also makes the toughness and fatigue strength of steel better than that of high-speed steel because it does not contain a large number of undissolved carbides.

From the perspective of chemical composition, all steel grades that add or adjust alloying elements to the matrix composition of high-speed steel, and appropriately increase or decrease the carbon content to improve the performance of steel and adapt to certain uses are called matrix steel.

Matrix steel can also be regarded as a kind of high-speed steel with a lower carbon content, sometimes directly called low-carbon high-speed steel, and its actual carbon content is in the middle carbon composition. This low-carbon high-speed steel is often used in molds under high impact loads, and due to the relatively low carbide, the toughness and process properties of the steel are also significantly improved.

It is recommended to use ASSAB's ASP material, which is used more on the hardware mold, with high hardness and good toughness, but it is very high.

In addition, Datong's DC53 is also good, much cheaper, the toughness is twice that of SKD11, and the high hardness of HRC62-63 can be reached after tempering at high temperature (520-530), and it also exceeds SKD11 in terms of strength, (of course, it is worse than ASP).

LG die steel is a multi-purpose die steel with excellent toughness and good wear resistance. The toughness of LG is about 8-9 times that of DC53, and the slender and small core of plastic molds will not break; The hardness HRC56-58 is used, which is high hardness and ensures high wear resistance.

There are many strengthening methods of materials, such as solution strengthening, precipitation strengthening, diffusion strengthening, fine-grained strengthening, work hardening, etc., usually the strength and plasticity of the material can not be improved at the same time, fine-grained strengthening can improve the strength and plasticity of the material at the same time in a certain scale range, and its plasticity will also be significantly reduced when the grain is sharply refined to the nanometer level.

ASSAB's Caldie is a good choice.

8566 die steel, so that your punch material does not crack. The toughness of 8566 is 4 times that of HSS SKH-9 and 2 times that of D2. 8566 uses hardness HRC58-60, high hardness to ensure high strength and wear resistance.

8566 is a mold steel grade in China, which has been developed by 5 experts for 3 years and certified for 2 years. Proprietary alloy composition, perhaps no alternative. Steelmaking adopts purification processes such as atmosphere protection and electroslag; Three forging and three pulling, good compactness; Ultra-fine processing, uniform tissue.

The main features are as follows:

1) High temperature resistance, within 600 meters, good comprehensive performance. The high temperature strength is comparable to that of high speed steel SKH51.

2) 8566 uses hardness HRC58-60, high hardness to ensure high strength and wear resistance.

3) The sulfur-free die steel has high purity, and the sulfur content of harmful impurities is as low as; Mirror polishing up to more than 12000.

4) The toughness of 8566 is 4 times that of high speed steel SKH-9 and 2 times that of D2.

In terms of punch material with hardness or thick plate material punch material, such as the above 201,304 stainless steel, 65mn thick plate stamping die. 8533 die steel can solve the problem of punch material cracking under the premise of ensuring the strength and wear resistance of punch material. The fracture resistance of 8566 is better than that of DC53, D2, LD, SKH-9, and Caldie.

Introduction to die steel.

It is a hot work die-casting die casting mold steel produced in Görlitz, Germany. The steel is electroslag remelted, the material is uniform, the hardenability is good, the machinability and polishing performance are good, the toughness and plasticity are high, the wear resistance of high and low temperature and the resistance to high temperature fatigue and heat resistance.

Die steel characteristics.

1.The material is uniform, and the machinability and polishing are superior.

2.High toughness and high plasticity.

3.High abrasion resistance at high and low temperatures.

4.Excellent overall hardenability.

5.It has good strength and heat fatigue resistance at high temperatures.

6.Very low deformability during heat treatment.

7.It has better isotropy than conventional steel, and has excellent toughness and plasticity in all directions.

Die steel heat treatment.

Forging, softening, annealing, hardening, tempering.

Purity: 1 each of A, A sulfide, B oxide, C silicate and D spherical oxide according to ASTME 45 method A, A sulfide, C silicate and D spherical oxide or DIN50602-K1 10 or as per customer's requirements.

Steel factory condition: soft annealing, good microstructure, hardness up to 229HB or quenched and tempered to customer requirements.

1) Isothermal annealing specification.

The annealing temperature is (850 10) °C, the temperature is kept for 2h, the temperature is cooled to (720 10) with the furnace, the heat preservation is 4h, the furnace is cooled to below 500 °C, the furnace is air-cooled, and the hardness is 229HBW.

2) High temperature tempering specification.

The tempering temperature is (730 10) °C, the heat preservation is 2h, the furnace is 500 °C, and the furnace is air-cooled.

3) Quenching and tempering specifications.

Quenching temperature 850 880, oil cooling, hardness 50 52hrc; The tempering temperature is 580 640 °C, the furnace is air-cooled, and the hardness is 28 36hrc

4) Pre-hardening treatment specification.

Heating temperature 860 900 °C, oil cooling, tempering temperature 570 70o °C, air cooling, tempering hardness 28 35hrc.

Physical properties of die steel.

1) Density. 2) Linear expansion coefficient:

Temperature 18 100 18 200 ° C 18 300 ° C 18 400 ° C 18 500 18 600 18 600

Linear expansion coefficient. 3) Modulus of elasticity: (20°C) 212000MPa, shear modulus (room temperature) is 825000MPa, Poisambi.

4) Thermal conductivity:

Temperature: 20, 100, 200 °C, 300 °C, 400 °C

Thermal conductivity operating condition: 30-56HRC.

Pre-hard hardness 28HRC; Annealed state with a hardness of 22HRC

Mold steel chemical composition.

Grade: C SI MN P S CR MO V

Ultrasound examination.

Or SEP1921-testgroup3-ciasse,e or as per customer's requirements.

Die steel uses.

1.Die-casting molds (mold cores, fixings, upper molds, nozzles, nitriding pins).

2.Extrusion dies (mold cores, supports, chokes).

3.Hot pressing molds, (aluminum, magnesium, copper alloys).

4.Components, such as cold shear, flash, hot shear, wear resistant parts.

Mold materials are the material and technical basis of the mold manufacturing industry. Among them, mold steel is a traditional mold material, and its variety, specification and quality play a decisive role in the performance, service life and manufacturing cycle of the mold. In recent years, the output, production technology, process equipment, quality, variety and other aspects of die steel at home and abroad have achieved relatively rapid development.

China has also produced a number of high-quality platform enterprises such as Heyuan Longji Hardware (LKM), Shanghai Huatai Mould (Huatai), etc. Objectively, it has promoted the promotion and popularization of foreign steel grades in China, and the comparison of mold steel grades has also come into being.

These have objectively promoted the promotion and popularization of foreign steel grades in China, and the comparison of mold steel grades has also come into being.

For the molding of fluorine-containing, chlorine and other corrosive plastics and all kinds of molds with flame retardant additives, if the product requirements are higher, imported corrosion-resistant steel can be selected, and domestic corrosion-resistant steel can be used for general requirements.

For molds with strong friction and impact plastics on steel, such as molds used to inject nylon + glass fiber materials, imported or domestic H13 steel with the advantages of high wear resistance, high tensile strength and high toughness needs to be selected.

Comparison table of mold steel grades

For the internal structural parts without appearance quality requirements, the molding material has no special requirements for the steel, and the molding parts are selected as follows: for large and medium-sized molds, the cavity can choose low-grade imported P20 or P20+Ni steel, and imported high-quality carbon steel S55C, S50C or domestic P20 or P20+Ni plastic mold steel; The core can be imported or domestic high-quality carbon steel. For small molds, if the output is higher and the structure is more complex, the cavity can be selected with low-grade imported P20 or P20+Ni steel, or domestic P20 or P20+Ni plastic mold steel; The core can be made of domestic plastic mold steel.

For small molds with simple structure and low output, domestic plastic mold steel or high-quality carbon steel can be selected for cavity cores.

Molded parts refer to mold parts that are molded in direct contact with plastics, such as cavities, cores, sliders, inserts, inclined tops, side pulls, etc. The material of the molded parts is directly related to the quality and life of the mold, and determines the appearance and internal quality of the molded plastic products. The selection principles of materials for molded parts are:

According to the type of molded plastic, the shape of the product, the dimensional accuracy, the appearance quality of the product and the use requirements, the size of the production batch, etc., taking into account the cutting, polishing, welding, etching, deformation, wear resistance and other properties of the material, while considering the economy and the manufacturing conditions and processing methods of the mold, in order to select different types of steel.

HMAX-4 is a new type of hot work die steel developed for copper alloy die-casting, hot forging, hot extrusion, hot shear, hot roll and other molds, and is also a medium carbon ultra-high strength and air-cooled hardening high-temperature die steel, which has good thermal strength, red hardness and wear resistance. Due to the good comprehensive properties of HMAX-4 die steel grades, it is suitable for making copper alloy die-casting, hot forging, hot extrusion, hot shearing, and hot roll die hot work dies with high heating temperature and harsh use conditions. Copper cone ring die-casting mold for automobile transmission synchronizer, copper elbow joint die-casting mold, 1 2 copper gate valve body die-casting mold, 1 copper gate valve body shell die-casting mold, copper pipe hot extrusion die, bearing ring hot extrusion die, liquid forging piston die, etc.