What does CR4 and CR5 refer to for lithium batteries

Lithium-ion batteries are divided into liquid lithium-ion batteries and polymer lithium-ion batteries. The electrolyte of lithium-ion batteries is fluid, so it is more unstable than lithium polymer batteries, and can be caused by a drop from an external force or by using a charger that does not meet the standards**. Many portable electronic products such as mobile phones and laptops use lithium batteries.

That is, many people have a "bomb" on their side. For the sake of safety, you must pay attention to the following points when purchasing. 1. Is there a clear capacity marked?

Batteries that do not have a clearly marked capacity (e.g. 1000mAh or 1000 mAh) are likely to be inferior or ** batteries. Many cheap batteries on the market are made of **battery core, **although cheap, but the life is short, the quality is unstable, and the use is not....

"Lithium battery" is a type of battery that uses lithium metal or lithium alloy as the anode material and uses a non-aqueous electrolyte solution. In 1912, lithium metal batteries were first developed by Gilbert NLewis proposed and studied.

In the 70s of the 20th century, m s.Whittingham proposed and began research on lithium-ion batteries.

Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been applied for a long time. With the development of science and technology, lithium batteries have now become the mainstream.

Lithium batteries can be broadly divided into two categories: lithium metal batteries and lithium-ion batteries. Lithium-ion batteries do not contain lithium in a metallic state and are rechargeable.

The fifth-generation product of rechargeable batteries, lithium metal batteries, was born in 1996, and its safety, specific capacity, self-discharge rate and performance** ratio are better than those of lithium-ion batteries. Due to its own high technical requirements, only a few companies in a few countries are now producing such lithium metal batteries.

This is a cold-rolled steel grade for automobiles.

cr3cr4

CR5 where is the plate thickness, 1565 is the standard width, and C represents the volume.

CR4, like CR3 and CR5, is a special steel grade used in the manufacture of cold rolled rolls, and the national standard has an independent standard. If you want to classify it, it should be "alloy tool steel" or "die steel". The chemical composition of Cr4 is:;;

Die steel is used to manufacture cold stamping dies, hot forging dies, die-casting dies and other die steel grades. According to the different conditions of the workpiece, the die steel can be divided into two categories: cold work die steel that deforms the metal in the cold state and hot work die steel that deforms the metal in the hot state. 1. Commonly used cold work die steel:

Molds with little force, simple shape and small size can be made of carbon tool steel. Molds with general force, complex shape or large size can be manufactured with low-alloy tool steel (such as 9Mn2V, 9CrSi, 9CrWMN, CrwMn, Cr12, etc.). When working, the material is stressed greatly, requiring high wear resistance, high hardenability, small deformation, and complex molds at the beginning, and high-carbon and high-chromium steels (CR12, CR12MOV, CR6WV, CR4W2MOV, CR2Mn2SIWMOV, and can also be made of low-carbon high-speed steel.

2. Commonly used hot work die steel: 5CrMnMo, 5CrNimo, 3Cr2W8V, 5Simnmov, 4Cr5MoVsi, 4Cr5W2Vsi, 4SicrV, 8Cr Cr4Mo, H13 In summary; CR12 is a cold work die steel material, HRC56-60 is the Rockwell hardness of the part after heat treatment, and the material properties achieved after quenching and low temperature tempering when the workpiece is basically formed.

That's not your full name, are you? Is it a drawing from abroad? Close to this is BS1449 CR4, which is a British standard and refers to the steel grade.

A steel that incorporates alloying elements such as SI, MN, NI, CR, W, MO, and V to carbon tool steel. The addition of CR and MN can improve the hardenability of the tool steel, and other elements can be added selectively or at the same time according to the requirements (the total amount of addition is generally not more than 5), that is, to form a series of alloy tool steels. The specific grades are:

9sicr、8mnsi、cr06、cr cr2、w、4crw2si、5crw2si、6crw2si、cr12 、c12mo1v1、cr12mov、cr5mo1v、9mn2v、crwmn、9crwmn、cr4w2mov、6cr4w3mo2vnb、6w6m o5cr4v、5crmnmo、5crnimo、3cr2w8v、 There are 33 grades of 5Cr4Mo3SimNVA Cr3Mo3W2V, 5Cr4W5Mo2V, 8CrMnsimov, 4Cr3Mo3SiV, 4Cr5Mosiv, 4Cr5Mosiv Cr5W2Vsi, 7MN15Cr2A13V2WMO, and 3C R2Mo.

Alloy tool steels and high-speed tool steels are annotated.

When the average carbon content of the alloy tool steel number, the carbon content is not marked; When the average carbon content is expressed in parts per thousand. For example, CR12, CRWMN, 9SICR, and 3CR2W8V. The content of alloying elements in steel is basically the same as that of alloy structural steel.

However, for alloy tool steel grades with lower chromium content, the chromium content is expressed in thousandths, and "0" is added before the number indicating the content in order to distinguish it from the general method of expressing the content of elements in percentages. For example, CR06. The steel grade of high-speed tool steel is generally not marked with carbon content, but only a few percent of the average content of various alloying elements.

Example. For example, the steel grade of tungsten high-speed steel is expressed as "W18Cr4V". If the steel grade is preceded by the letter "C", it means that its carbon content is higher than that of the general purpose steel grade without "C". Stainless steel, with an average carbon content of 13% chromium, is expressed as "2Cr13"; The upper limit of carbon content is, the average chromium content is 18%, and the nickel content is 9%, and its grade is expressed as "0Cr18Ni9"; The upper limit of carbon content is sulfurized free-cutting chromium stainless steel with an average chromium content of 17%, and its grade is expressed as "Y1Cr17"; The average carbon content is, high-carbon chromium stainless steel with a chromium content of 17%, and its grade is expressed as "11cr7"; The upper limit of carbon content is, the average chromium content is 19%, the nickel content is 10% ultra-low carbon stainless steel, and its grade is expressed as "03Cr19Ni10"; The upper limit of carbon content is very low-carbon stainless steel with an average chromium content of 19% and nickel content of 11%, and its grade is expressed as "01Cr19Ni11".

Higher than 0,65 is high carbon can not be marked 2, when higher than 1% is not standard, it is known that this is not applicable to high-speed steel, the 2 words in the question should be 100%.

1. The focus of steel is different

Injection cold mold test steel focuses on hardness and wear resistance; Injection hot mold trial steel has appropriate hardness requirements, focusing on red hardness, thermal conductivity, and wear resistance.

2. The carbon content is different.

The carbon content of injection cold mold test mold is high, and the alloying elements are mainly to increase hardenability and improve wear resistance. The carbon content of injection hot mold test mold is low, and the alloying elements are mainly to increase hardenability, improve wear resistance and red hardness.

Extension of knowledge points:

Injection mold cold mold trial mold includes manufacturing punching mold (blanking punching die, trimming die, punch, scissors), cold heading die and cold extrusion die, pressure bending die and wire drawing die, etc.;

Injection mold hot mold trial mold includes three types: hammer forging mold, hot extrusion mold and die-casting mold.