What does 420 mean, what does 4340 mean

420 Ya'an City, Sichuan Province**.

4340 is a high-strength alloy steel grade in ASTM A322. 4340 is mainly used to manufacture important parts with high strength and good plasticity, and to manufacture important parts with special functional requirements, such as shafts, gears, fasteners, etc., after nitriding treatment.

4340 material is used as an important quenching and tempering parts that require good toughness, high strength and large size, such as high-load shafts for heavy machinery, turbine shafts with a diameter of more than 250mm, rotor shafts for turbojet engines, blades, high-load transmission parts, crankshaft fasteners, gears, etc.

It can also be used for rotor shafts and blades with an operating temperature of more than 400 °C; It can also be used to manufacture important parts with special performance requirements after nitriding treatment, and can be used as ultra-high strength steel after low-temperature tempering or isothermal quenching. Mainly due to its toughness, steel 4340 can be used in heavy machinery, especially in the manufacture of transmission components such as heavy-duty shafts, gears, and axles.

4340 steel is a medium-carbon nickel-chromium-molybdenum steel alloy with excellent tensile strength, toughness, and fatigue resistance. Since the material is usually in an annealed state, additional heat treatment can produce parts with higher strength and fatigue resistance. In addition, 4340 steel is a wear-resistant material with particularly good abrasion, impact, and impact resistance, as well as excellent atmospheric corrosion resistance.

AISI 4340 GB steel grade in China: 40CrNi2MOA, German DIN steel grade 36CrNIMO4, German DIN material number, French NF standard 40NCD3, Japanese JIS standard SNCM439, British BS standard 816M40, American AISI ASTM4340, American UNS standard G43400

Chemical composition. Carbon C:

Silicon si:manganese mn:

Sulfur s:

Phosphorus p:

Chromium Cr:Molybdenum Mo:

Nickel ni:

sae 4340

Grade: 4340

Standard: ASTM A29 A 29M-05

Features & Applications:

4340 Special Steel, American Special Steel.

4340 round steel, 4340 bonded steel, alloy structural steel referred to as bonded steel, 4340 is one of the bonded steel, also known as alloy steel, it is based on high-quality carbon structural steel, appropriately add one or more alloying elements (the total content does not exceed 5%) and make of steel.

It corresponds to Chinese grade 40CrNi2MOA, German DIN steel grade 36CRNIMO4, German DIN material number, French NF standard 40NCD3, Japanese JIS standard SNCM439, British BS standard 816M40, American AISI ASTM4340, American UNS standard G43400

sae 4320

Grade: 4320

Standard: ASTM A29 A 29M-05

Features & Applications:

4320 Special Steel, American Special Steel.

Chemical Composition: Carbon C:;

Manganese mn:phosphorus p:

Sulfur s: Silicon nickel ni:

Chromium Cr: Molybdenum.

It is a steel model.

AISI 4340 corresponds to the Chinese grade 40CrNi2Mo high-strength steel.

40CrNi2Mo round steel, 40CrNi2Mo bonded steel, alloy structural steel is referred to as bonded steel, 40CrNi2Mo is one of the bonded steel, also known as alloy steel, it is based on high-quality carbon structural steel, appropriately adding one or several alloying elements (the total content does not exceed 5%) and made of steel grades.

The common quality defects of bearing parts after heat treatment are: overheating, underheating, quenching cracks, insufficient hardness, heat treatment deformation, surface decarburization, soft spots, etc.

AISI 4340 belongs to the American standard high-strength alloy structural steel, according to the following standard: ASTM A29 A29M-04

The chemical composition of AISI 4340 is shown in the following figure:

AISI 4340 alloy structural steel has high strength, toughness and outstanding hardenability and overheating stability, and is mainly used for large-size important quenched and tempered parts, such as high-load shafts of heavy machinery, turbine shafts with a diameter of more than 250mm, rotor shafts, turbo shafts, blades, high-load transmission parts, and crankshaft fasteners for turbojet engines. gears, etc.;

420 means "is to love you", the number homonym is a symbol for people to better express their love, similar numbers represent the meaning as follows:

1. 1 represents only.

1. You, the starting point.

2. 2 represents love and the world of two people.

3. 3 represents missing, life, life, and life.

4. 4 represents Yes, Always, and I.

5 and 5 represent me, which can also be understood as not distinguishing between you and me, and also has the meaning of crying "woo woo woo".

Similar numerical homonyms also include:1. Start with 0 words.

02825: Do you love me.

04527: You're my beloved wife.

Second, the beginning of the word 1.

1414: To die or to die.

1457: You're my wife.

3. Start with the word 2.

20110: Love you for 110 years.

20184: Love you for a lifetime.

420 means "is to love you".

Number Definition: 0 - represents perfection, perfection, and endlessness;

1 - on behalf of the only.

1. You, the starting point.

2 - on behalf of love, the world of two people;

3 - represents missing, life, life;

4 - Represents yes, always;

5 - on behalf of me, it can also be understood as not distinguishing between you and me;

6 - on behalf of smooth, walking;

7 - on behalf of the invitation, rise, gas;

8 - on behalf of hair, bye-bye, no;

9 - represents long, just, seeking.

The type of language of the network.

1. Numeric type: generally homophonic, for example, 9494 = is, is; 7456=I'm; 886=Bye-bye.

2. Translation: In fact, this is very common in linguistics, that is, loanwords, generally according to the pronunciation of the original text, find suitable Chinese characters instead, such as "Yi Meier" = e-mail, mail.

3. Alphabet type: There are three kinds of word-making methods: one is homophony, which replaces the original Chinese characters with the pronunciation of simple letters, such as mm = sister; pp = drifting (now the diacritic is especially popular because of the repetition of its pronunciation, which gives people a sense of cuteness), which means beautiful.

4. Symbolic type: simple symbols are mostly used to represent a specific expression or text, and most of them are expressions. For example, "-- indicates a "speechless" expression; An expression of "surprise"; "tt" means "tearful" expression;It means "sweat".

Red envelope 420 is the meaning of love "swear to love you", because the Mandarin pinyin homonym of the Arabic numeral 420 is obviously to swear to love you. That's what I mean by swearing to love you deeply! Then I believe that their love must be an alliance!

This 420 yuan red envelope also represents a sincere and deep feeling. In fact, 420 classic homophonic love number passwords.

425 is the asteroid 425, which is synonymous with the asteroid.

Xiaoxing's 425 Wild Star (Void Rock 425 Cornelia) is an asteroid. On December 28, 1896, the French astronomer Auguste Chaluwa was in Nice, France.

The planet was discovered. These are in the solar system.

The small celestial bodies scurrying around, although they are not large, have amazing speed, and once they hit the earth, the consequences are unimaginable.

Orbital parameters of asteroid 425:Ascending node longitude ( ).

Periapsis angular distance ( ).

Flat perisis angle (m):;

Perihelion range (rp): au;

Apohelion Range (RA): au;

Half Diameter: au;

Flat angular velocity.

day；Average orbital speed: au day.

420 means "is to love you".

Number Definition: 0 - represents perfection, perfection, and endlessness;

1 - on behalf of the only.

1. You, the starting point.

2 - on behalf of love, the world of two people;

3 - represents missing, life, life;

4 - Represents yes, always;

5 - on behalf of me, it can also be understood as not distinguishing between you and me;

6 - on behalf of smooth, walking;

7 - on behalf of the invitation, rise, gas;

8 - on behalf of hair, bye-bye, no;

9 - represents long, just, seeking.

Hello, I'm sorting out the answer based on your question, please wait a moment.

420 means "is to love you". Number Definition: 0 - represents perfection, perfection, and endlessness; 1 - on behalf of the only.

1. You, the starting point. 2 - on behalf of love, the world of two people; 3 - represents missing, life, life; 4 - Represents yes, always; 5 - on behalf of me, it can also be understood as not distinguishing between you and me; 6 - on behalf of smooth, walking; 7 - on behalf of the invitation, rise, gas; 8 - on behalf of hair, bye-bye, no; 9 - represents long, just, seeking.

420 means "is to love you".

Number Definition: 0 - represents perfection, perfection, and endlessness;

1 - on behalf of the only.

1. You, the starting point.

2 - on behalf of love, the world of two people;

3 - represents missing, life, life;

4 - Represents yes, always;

5 - on behalf of me, it can also be understood as not distinguishing between you and me;

6 - on behalf of smooth, walking;

7 - on behalf of the invitation, rise, gas;

8 - on behalf of hair, bye-bye, no;

9 - represents long, just, seeking.

Internet language, which means ".It's love for youDeath loves you

0":019425 You still love me; 02746 You're sick to death ; 02825: Do you love me. 03456 Your lovesickness is useless .

5":53770 I want to kiss you ; 53719 I am still affectionate ; 584520 I swear I love you .

Answering kisses, it is the first meeting gift, we also have such a custom here, and when we get married, there are red envelopes, and then it is time to change the words, the number 420 has no special meaning, that is, the red envelope double number means good things in pairs.

We hope you find it helpful.

The five-star is a kiss with a box in the lower left corner that can be lit

This is a tragedy related to Hearthstone.

Hearthstone - Heroes of Warcraft is a card game set in World of Warcraft that Blizzard began testing in 13 years.

Si Youtian is a high-level player in this game, and when he participated in the game, he was twice hit by his opponent jumping a coin at 4 mana to play the card "Holy Wrath", and the lava giant who drew 20 mana dealt 20 damage.

The purpose of the card is to draw a card and deal damage equal to the cost of the card. Since the cost curve of the Hearthstone card game is dominated by 2-4 mana, the expected damage of this card is not very high. The lava giant, which costs up to 20 fees, can only bring two, and the probability of drawing is even less high.

The Japanese homonym (shi tsu re) means rude.

Direct interpretation: Dead zero miles, no one left. Don't be superstitious, nothing, scare you.