What is the difference between A2 and A4 stainless steel 30

1 strength grade, A stands for"Austenite"2 represents the second material (in fact, 2 refers to 304), and -70 represents the strength level is 700mpa

The common materials are A2 and A4, which are 304 and 316 respectively, but as long as the mechanical properties can be guaranteed, the chemical composition can be different. Common grades are:

A2-60 (basically no more).

A2-70A2-80 (rare).

a4-70a4-80

A4-90 (it seems that it cannot be produced in China at present).

What are ordinary carbon steel screws labeled, A4-70 and A4-80 are no different in the material itself?

is the yield strength.

A1, A2, A4 for ; 45, 50, 60, 70, 80 represent 1 10 of the minimum tensile strength of the fastener

2, A4 group belongs to austenitic stainless steel, is developed for boiling sulfuric acid, so named acid-resistant steel, belongs to the sub-stable acid-resistant steel, typical representatives and A4-80 behind the 70 and 80 represent the minimum tensile strength of fasteners 1 10, A4-70 and A4-80 in the material itself is no different, because it is austenitic stainless steel, so can not be improved by means of heat treatment, the improvement of its tensile strength is through the dislocation barrier after deformation (commonly known as cold hardening), A4-70 bolts on the market are more circulating, A4-80 is rare, 3

Stainless steel bolts are usually marked as A4-70, A2-70.

The difference between stainless steel A2-70, A4-70, A2-50, A4-50.

Hello dear, happy to help you. 1. Different chemical composition: A2 is the second group of austenitic steel, and A4 is the fourth group of austenitic steel. The chemical composition of A2 and A4 is different (A2-70 and A2-50 are both A2 groups and have the same chemical composition; A4-50 and A4-70 are both A4 groups, the chemical composition is the same), 2, the mechanical properties are different A2, the number 70 after A4, 50 represents the performance level, and the mechanical properties of A2 and A4 of different performance grades are different (A2-70 and A4-70 performance grades are 70, and the mechanical properties are the same; A2-50 and A4-50 performance grades are both 50, and the mechanical properties are the same,) 3. The processing methods are different, and the processing methods of austenitic steels of different performance grades are different.

Performance class 70 is cold-worked, while performance class 50 is specially processed.

1. The chemical composition is different.

A2 is the second group of austenitic steels, and A4 is the fourth group of austenitic steels. The chemical composition of A2 and A4 is different (A2-70 and A2-50 are both A2 groups, and the chemical composition is the same; A4-50 and A4-70 are both A4 groups, the chemical composition is the same), the chemical composition is shown below, extracted from the national standard GB.

2. The mechanical properties are different.

The numbers 70 and 50 after A2 and A4 indicate the performance level, and the mechanical properties of A2 and A4 are different for different performance levels (A2-70 and A4-70 performance levels are both 70, and the mechanical properties are the same; A2-50 and A4-50 performance levels are both 50, the mechanical properties are the same,), the specific performance parameters are as follows, extracted from the national standard GB.

3. The processing method is different.

Austenitic steels are processed differently depending on the performance grade. Performance class 70 is cold worked, and performance class 50 is specially processed.

A2 is an American high-toughness wear-resistant tool steel, which is a wind-hardened steel. The mass fraction of the steel carbon is about 1%, the hardness 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 extremely 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 dimensional deformation after air quenching, and uniform and fine carbides.

The GB standard grade CR6WV, the German DIN standard material number German DIN standard grade X100CRMOV51, the British BS standard grade BA2, and the French AFNOR standard grade Z100CDV5.

A4 steel is a kind of duplex steel, the corrosion resistance is better than that of austenitic stainless steel containing MO2-3, and it is generally used in the manufacture of fertilizer equipment, full-cycle late branch deficiency urea code identification equipment.

The chemical composition of A4 steel is shown below:

The mechanical properties of A4 steel are shown below:

Answer: A2 is alloy tool steel, which is equivalent to CR5Mo1V in China, which is the Chinese brand of A2 steel introduced from the United States, which is mostly used in the manufacture of cold work molds. 1. Tool steel is a steel used to manufacture cutting tools, measuring tools, molds and wear-resistant tools. 2. Tool steel has high hardness and can maintain high hardness and red hardness at high temperatures.

Main ingredients.

C carbon Si silicon.

MN manganese cr chromium.

Mo Mo V Vanadium.

Description: Fencola Cold Work Die Steel A2

Characteristics: Air-cooled hardenable chrome steel, excellent toughness, high wear resistance, small heat treatment deformation.

Usage: stretching die, crimping die, embossing die, abrasive plastic molding die.

Factory condition: spheroidized annealed HB 248

A2 is the United States Fencola high toughness and high wear-resistant die steel, the Chinese distributor in Suzhou City, by Suzhou Donghe Special Steel **** total distribution, A2 steel after treatment hardness up to 58 62HRC, greatly improving the life of the mold.

A2 steel has good hardenability, uniform carbide distribution, certain impact and good wear resistance. It has good air quenching performance, small size deformation after air quenching, and has the requirements of mold wear resistance and toughness. Chemical Composition:

A2 is an alloy cold work tool steel.

A2 cold work die steel, which is the A2 steel in the United States, is the most widely used type A air quenched steel. It is suitable for cold work die steel that requires both wear resistance and toughness, and can replace CRWMN and 9Mn2V steel to make medium and small cold blanking dies, blanking dies, forming dies and punches.

Characteristics and scope of use.

Chemical Composition:Carbon C:

Silicon SI:

Manganese mn:

Sulfur s:

Phosphorus p:

Chromium Cr: Nickel Ni: Permissible Residual Content

Copper Cu: Permissible residual content

Vanadium V: Molybdenum Mo:

Mechanical properties. Hardness: annealed, 255HB, indentation diameter; Quenching, 60HRC heat treatment specification and metallographic structure.

Heat treatment specifications: quenching, 790 15 preheating, 940 6 (salt bath) or 950 6 (furnace controlled atmosphere) heating, heat preservation 5 15min, air cooling, 200 6 tempering.

Delivery Condition: The steel is delivered in annealed condition.

A2 Mould Steel:

The hardness of A2 is higher than that of SKD11 after heat treatment, and the high hardness of 60-62HRC after tempering at high temperature (500-520) can be reached, which is more than SKD11 in terms of strength.

Characteristics: A2 is an American high-toughness wear-resistant tool steel, which is a wind-hardened steel. The mass fraction of the steel carbon is about 1%, the hardness 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 extremely 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 size deformation after air quenching, uniform and fine carbide, and good wear resistance.

A2 is a mid-grade silicon-manganese abrasive steel with a certain elasticity and is suitable for cutting materials.

However, the hardness and anti-rust ability are not as good as D2 (D2 belongs to semi-stainless steel).

Among the tool steels, M2 and the upgraded M4 have excellent performance.

For details, please refer to the encyclopedia source.

Hope it helps!

A2 is an American brand, a kind of cold work die steel, equivalent to the domestic name of CR5Mo1V, the steel belongs to the air quenching steel, because of the high carbon content and hardness can be comparable to D2, and because of the less alloying elements than D2, both from the cost and from the toughness are more advantageous than D2, so the steel is a good substitute for D2 in some occasions, a promising steel grade. In addition, although A2 is classified as cold work die steel, it is not impossible to use as a hot work die, because its alloying elements are equivalent to H13, and the carbon content is higher than H13, so A2 can be used instead of H13 when the temperature of some molds is not very high but the hardness of the mold is higher.

A2 is an American high-toughness wear-resistant tool steel, which is a wind-hardened steel. The mass fraction of carbon is about 1%, the hardness 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 extremely 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 size deformation after air quenching, uniform and fine carbide, and good wear resistance.

Steel: widely used, variety, according to the different cross-sectional shapes, steel is generally divided into four categories: profiles, plates, pipes and metal products. Steel is a material of a certain shape, size, and properties that ingots, billets, or steel are made by pressure processing.

Most steel processing is carried out by pressure processing, which causes plastic deformation of the processed steel (billets, ingots, etc.). According to the different processing temperatures of steel, it can be divided into two types: cold working and hot working.

Classification of uses: 1) Structural steel for construction and engineering is referred to as construction steel, which refers to the steel used to make metal structural parts in buildings, bridges, ships, boilers or other projects. Such as carbon structural steel, low alloy steel, steel steel, etc.

2) Structural steel for machinery manufacturing refers to the steel used to manufacture structural parts of machinery and equipment. This kind of steel is basically high-quality steel or high-grade high-quality steel, mainly high-quality carbon structural steel, alloy structural steel, easy-cut structural steel, spring steel, rolling shirt moving bearing steel, etc.

It is generally used in the manufacture of various tools, such as carbon tool steel, alloy tool steel, high-speed tool steel, etc. According to the use, it can be divided into cutting tool steel, cavity mold steel, and measuring tool steel.

Steel with special properties, such as stainless acid-resistant steel, heat-resistant and non-peeling steel, high-resistance alloy, wear-resistant steel, magnet, etc.

This refers to the steel for professional purposes in various industrial sectors, such as automotive steel, agricultural machinery steel, aviation steel, chemical machinery steel, boiler steel, electrical steel, welding rod steel, etc.