Is 20 Lonnime A a special steel?

20Crnimo steel is alloy structural steel, alloy structural steel: 20Crnimo standard: GB T 3077-1988

Chemical Composition: Carbon C:

Silicon si:manganese mn:

Sulfur S: Permissible residual content

Phosphorus p: permissible residual content

Chromium Cr: Nickel Ni:

Copper Cu: Permissible residual content

Molybdenum MO: Mechanical Properties: Tensile Strength B (MPa): 980(100)Yield Strength S (MPa): 785(80)Elongation δ5 (9

Section shrinkage 40

Impact power AKV (J): 47

Impact toughness value kv (j cm2): 59(6)hardness: 197hb

Specimen size: The specimen blank size is 15mm

Heat treatment specifications and metallographic structure:

Heat treatment specification: quenched 850, oil cooled; Tempered 200, air-cooled.

Delivery Status: Delivered in heat-treated (normalized, annealed or high-temperature tempered) or without heat-treated, the delivery status should be indicated in the contract.

Yes.

20Cr2Ni4A is a high-quality alloy steel with high strength, good toughness and hardenability. After carburizing, it cannot be quenched directly to reduce the residual austenite on the surface.

Features and scope of application:

Machinability and cold deformation plasticity are average. The weldability is poor, it needs to be preheated to about 150 before welding, and the white spot sensitivity is strong during working hours, and there is a tendency to temper brittleness. 20Cr2Ni4A is used for large cross-section carburized parts, such as large gears, shafts and quenched and tempered parts that require high strength and good toughness.

Chemical Composition: Carbon C:

Silicon si:manganese mn:

Sulfur s:

Phosphorus p:

Chromium Cr: Nickel Ni:

Mechanical properties: tensile strength b (mpa): 1483

Conditional yield strength MPa): 1292

Elongation δ5 (%13

Section shrinkage 57

Impact toughness value kv (j cm2): 75

Hardness: 434HB

It refers to 20cr, 20cr is a low hardenability carburized steel.

Chemical composition (mass fraction) (%.)

Carbon C: Silicon Si:

Manganese Mn: Chromium Cr:

Sulfur s:

Phosphorus p:

Nickel ni:

Copper cu:

Molybdenum mo:

Tensile strength ( b mpa): 835

Yield point ( s mpa): 540

Elongation after fracture (δ5%): 10

Section shrinkage 40

Work of impact absorption (aku2 j): 47

Brinell hardness (HBS100 3000) (annealed or high-temperature tempered state): 179 This kind of steel is mostly used to manufacture carburized parts (oil quenching) with high core strength requirements, surface wear and tear, cross-section below 30mm, or complex shape and small load, such as: machine tool gearbox gears, gear shafts, cams, worms, piston pins, claw clutches, etc.; For parts with small heat treatment deformation and high wear resistance, high-frequency surface quenching should be carried out after carburizing, such as gears, shafts, spline shafts, etc. with a module less than 3.

It can also be used in a quenched and tempered state to make parts that work at high speeds and withstand moderate shock loads, and can also be used as a steel for low-carbon martensitic quenching, further increasing the yield and tensile strength of the steel (about double).

20MNTIB belongs to the national standard alloy structural steel, and the implementation standard: GB T 3077-2015

20mNTIB is a substitute steel for 20crmnti, alloy structural steel, with good mechanical properties and process properties, the critical quenching diameter in oil is up to 14 27mm, the machinability is good after normalization, and the fatigue strength, deformation and notch sensitivity under bending load after heat treatment are not inferior to 20crmnti; In addition, the grain growth tendency is small during carburizing, so it can be cooled (not less than 800) quenched after carburizing, but the deformation is slightly larger than that of 20crmnti during heat treatment. This steel is widely used in the manufacture of gears and other carburized parts with small cross-sections, medium loads on automobile tractors.

The chemical composition of 20mNTIB is shown in the figure below

20mntib: reads as: eicomanganese titaniumboron.

According to the GB T 3077 1999 alloy structural steel standard, this steel group belongs to: MNTIB steel series.

Unified digital code: A74202, chemical composition: C mn Ti,

: Structural steel, tool steel, die steel, spring steel, bearing steel, cold heading steel, hard wire.

Steel is an iron-carbon alloy with a carbon content in between. In order to ensure its toughness and plasticity, the carbon content generally does not exceed. In addition to iron and carbon, the main elements of steel are silicon, manganese, sulfur, phosphorus, etc. There are many ways to classify steel, and the main methods are as follows:

1. Classification by quality.

Carbon Steel: AMild steel (c; b.Medium carbon steel (;

c.High-carbon steel (c.

low-alloy steels (5% total alloying elements); b.Medium alloy steel (5% alloying element content 10%); c.High-alloy steel (total alloying element content: 10%).

2. Classification according to forming methods: (1) forged steel; (2) Cast steel; (3) hot-rolled steel; (4) Cold drawing.

4. Classification according to metallographic organization.

Annealed state: asubeutectic steel (ferrite + pearlite); b.eutectic steel (pearlite); c.Pereutectic steel (pearlite + cementite); d.Ledeonitic steel (pearlite + cementite).

Normalizing state: apearlitic steel; b.bainite steel; c.martensitic steel; d.Austenitic steels. (3) There is no phase change or partial phase change.

5. Classification by use.

Engineering steel: AOrdinary carbon structural steel; b.low-alloy structural steels; c.Reinforced steel.

Carburized steel: anitriding steel; b.steel for case quenching; c.easy-cut structural steel; d.Cold plastic forming steel: including cold stamping steel, cold heading steel.

carbon tool steel; a.alloy tool steel; b.High-speed tool steel.

Special performance steel: Astainless acid-resistant steel; b.Heat-resistant steel: including oxidation-resistant steel, hot-strength steel, and gas valve steel; c.electrically heated alloy steel; d.wear-resistant steel; e.low-temperature steel; f.Steel for electricians.

Steel for bridges, ships, boilers, pressure vessels, agricultural machinery, etc.

6. Comprehensive classification.

High-quality steel (including high-grade premium steel).

Structural steel: (a) high-quality carbon structural steel; (b) alloy structural steel; (c) spring steel; (d) easy-cut steel; (e) bearing steel; (f) High-quality structural steel for specific purposes.

Tool steels: (a) carbon tool steels; (b) alloy tool steels; (c) High-speed tool steel.

Special performance steel: (a) stainless acid resistant steel; (b) heat-resistant steel; (c) Electrically heated alloy steel; (d) electrical steel; (e) High manganese wear-resistant steel.

7. Classification according to smelting method.

Electric furnace steel: (a) electric arc furnace steel; (b) electroslag furnace steel; (c) Induction furnace steel; (d) Vacuum self-consumable furnace steel; (e) Electron beam furnace steel.

It's chrome, cr

A lot of people read luo

This material is.

0Cr25Ni20 (new grade 06Cr25Ni20) heat-resistant stainless steel (typical composition%: is a high chromium-nickel austenitic stainless steel, which has excellent corrosion resistance in oxidizing medium, and at the same time has good high-temperature mechanical properties, so it can be used for both corrosion-resistant parts and high-temperature parts.

They are all stainless steel models, precipitation hardening stainless steel:

Also belongs to the 200 series (chromium-manganese-nickel).

and 304 both belong to the 300 series: chromium-nickel austenitic stainless steel.

301: Good ductility for molded products. It can also be quickly hardened by machining. Good weldability. The wear resistance and fatigue strength are better than those of 304 stainless steel.

304: General model; i.e. 18-8 stainless steel. Products such as:

Corrosion-resistant containers, cutlery, furniture, railings, medical equipment. The standard composition is 18% chromium plus 8% nickel. It is a stainless steel that is non-magnetic and cannot be changed by heat treatment.

No. 20 steel can be divided into No. 20 nickel-based alloy and No. 20 alloy steel, depending on which component content you need, the performance and use are also differentShanghai Xiangqia metal team is looking forward to your consultation

Physical properties: density: g cm3 melting point: 1357-1430

Characteristics: N08020 stainless steel has good corrosion resistance to sulfuric acid chemicals, and good resistance to chloride, phosphoric acid and other environmental corrosion. It resists sensitization and resultant mesocrystalline corrosion with stable niobium-containing elements, and it also has good mechanical properties and processability.

Applications: Chemical, food, pharmaceutical and plastics industries, heat exchangers, pickling equipment, synthetic rubber production equipment, pumps, valves and pipelines.

The alloy is a stainless steel with extremely high corrosion resistance to sulfuric acid. It can be widely used in high-concentration, high-temperature sulfuric acid environment. In addition, it also has excellent resistance to intergranular corrosion and stress corrosion cracking.

Processability.

It can be treated in the same way as ordinary austenitic stainless steels.

Weldability welding, like quasi-austenitic stainless steels, can be TIG, MIG and manual arc welding, and due to its NB content, we recommend minimizing heat treatment. Use ER320 and ER320LR for solder.

MachinabilityThe machinability is about the same as that of standard austenitic stainless steels. For cutting, use high-speed steel tools or cemented carbide tools, and it is best to slow down the advance speed and increase the depth of cut.

Heat treatment is stable The heat treatment condition is 925 1010 (ASTM A480 A480M specified conditions), and it must be quenched after heat treatment.

20 alloy steel chemical composition, application range of application fields are: No. 20 alloy steel is used in sulfuric acid environment and sulfuric acid solution containing halogen ions and metal ions, such as hydrometallurgy and sulfuric acid industrial equipment, including aggressive inorganic acid solution, chlorine and chloride-containing various media, dry chlorine, formic acid and acetic acid, anhydride, seawater and salt water, etc.

The chemical composition and application range of alloy steel are: No. 20 alloy steel is used in sulfuric acid environment and sulfuric acid solution containing halogen ions and metal ions, such as hydrometallurgy and sulfuric acid industrial equipment, including highly aggressive inorganic acid solution, chlorine and various media containing chloride, dry chlorine, formic acid and acetic acid, anhydride, seawater and salt water, etc.

Alloy steel corresponding grades at home and abroad:

Alloy steel supply specifications: round bars, bars, strips, tubes, valve seats, balls, flanges and forgings negotiated**.

Alloy Steel Chemical Composition:

Alloy steel has the following characteristics: No. 20 alloy steel is characterized by resistance to oxidation-reducing composite media corrosion.

Corrosion resistance of alloy steel: No. 20 alloy steel is a corrosion-resistant alloy with many excellent properties, good resistance to oxidation and moderate reducing corrosion, excellent resistance to stress corrosion, cracking ability and good local corrosion resistance, and satisfactory corrosion resistance in many chemical process media.

20 alloy steel is the American standard N08020 corrosion-resistant stainless steel, and the Chinese grade is NS143....It's not the carbon steel that the people said above.

among them"20"Refers to the element"Carbon"The mass fraction content is 20% of the total metal mass. The carbon content of a metal has a great influence on the properties of steel. "alloys"In addition to iron and carbon. There are other elements as well.

Upstairs, it's all wrong. You're talking about No. 20 carbon steel, No. 20 alloy steel is not like that. The United States is quite CN7m, and China is quite 0cr20ni35mo3cu4nb, and the use temperature is -196 to 450 degrees, mainly used for sulfuric acid, phosphoric acid. etc,

What the landlord said is not 20cr alloy structural steel.

What kind of plane are you doing upstairs! Don't talk nonsense if you don't know! Carbon content 20% ?

Steel belongs to high-quality carbon steel.

Material state = annealed steel.

b\mpa=≥410

s\mpa=≥245

Chemical composition = proportion of constituent elements (%) carbon; Chromium cr: ; Manganese mn:; Nickel ni:Phosphorus p:Sulfur s:Silicon SI:

Characteristics and application = high plasticity of cold deformation, generally used for bending and calendering, in order to obtain good deep drawing and calendering performance, the plate should be normalized or tempered at high temperature; It is used for mechanical parts that do not withstand great stress and require great toughness, such as levers, bushings, screws, lifting hooks, etc., and can also be used for carburizing and cyanide parts with high surface hardness and little core strength requirements, and the machinability of cold drawn or normalized state is better than that of annealing state without heat treatment: HB 156;Heat treatment: normalizing.

It's really, it's tireless!

Wubozai - Probationary period Level 1.

Is your brain flooded?

20 of the carbon content of the steel ???

You make a piece out and see!

I can knock it open!

Don't say if you don't understand, it's embarrassing to throw home!