合金钢牌号（Alloysteelgrade）

Alloy steel grades, with extremely few said carbon content, like this 12 refers to the mass fraction of carbon;

The alloy element is generally less than 1.5% in mass, and only the chemical elements are marked in the grade, such as Mo and V in this, when the mass fraction is reached

1.5%-2.49%, 2.5%-3.49%, is 2, 3 to say, and so on, for example, you say 12Cr1MoV Cr inside.

First, China's steel said method.

Steel grades are referred to as number, name of each specific steel products for the people to understand, is a common language of steel. China's steel square

Law, according to the national standard \"iron and steel products trademark representation method\" (GB/T221 - 2000), and in November 1, 2000 began Shi.

Generally speaking, the product brand is represented by the combination of Chinese phonetic alphabet, chemical element symbol and Arabia numeral. That is:

The chemical elements in steel by international chemical symbols, such as SiMnCr...... Etc.. The mixed rare earth elements are represented by \"RE\" (or \"Xt\").

The product name, use, smelting and casting methods are generally expressed in the abbreviation of Chinese phonetic alphabet,

The content of main chemical elements in steel (%) is expressed by Arabia numeral.

When the Chinese phonetic alphabet is used to indicate the product name, the purpose, the characteristic and the technological method, it is usually selected from the Chinese phonetic alphabet which represents the product name

Letters. When repeating letters selected from another product, you can use second letters or third letters, or select two characters at the same time

The first phonetic alphabet.

Chinese characters and Hanyu Pinyin are not available for the time being, and the symbols are in English letters.

Two, China's steel classification method

1, carbon structural steel and low-alloy high strength structure of the brand, said the method

The above steel is usually divided into two categories: general steel and special steel. A representation of a brand, yielding to the Chinese phonetic alphabet of the yield or yield strength of the steel

The point or yield strength value, the quality grade of the steel, and the degree of deoxidation of the steel are actually 4 parts.

The universal structural steel uses the phonetic alphabet \"Q\which represents the yield point\". Yield point value (MPa) and the quality grade specified in Table 1 (A, B),

C, D, E), deoxidation methods (F, B, Z, TZ) and other symbols, in order to form a brand. For example, carbon structural steel grades are expressed as: Q23

5AF, Q235BZ; low alloy high strength structural steel grades are expressed as: Q345C, Q345D.

Q235BZ said the quality grade is greater than or equal to 235MPa, yield point for calm carbon steel grade B.

Q235 and Q345 these two grades are the most typical production steel, production and use of the largest, most widely used brand. These two brands are almost all over the world

Every country has its own.

In the grades of carbon structural steels, the symbols of \"Z\" and \"TZ\" can be omitted, for example, the quality grades are C and

D grade Q235 steel whose grades are indicated as Q235CZ and Q235DTZ, but may be omitted as Q235C and Q235D.

Low alloy high strength structural steel has killed steel and special killed steel, but the end of the mark is not written to indicate the method of deoxidation.

Special structural steel is usually represented by the symbol \"Q\yield point value, and the symbol of the product used in Table 1, which represents the yield point of the steel,

For example: pressure vessel steel grade is \"Q345R\"; weathering steel, its brand is \"Q340NH\"; Q295HP welding cylinder steel brand;

Q390g grades of steel for boilers; grades of steel for Q420q bridges.

According to the requirement, the standard of universal low alloy high strength structural steel can also be used by two Arabia figures (mean carbon content, a few tens of millions)

And chemical element symbols are expressed in sequence. The number of special low alloy high strength structural steels can also be used in two digit Arabia figures

The carbon content, in the tens of thousands, and the symbol of the chemical elements, and the symbols specified in Table 1 for the use of the products, are expressed in sequence.

2, quality carbon structural steel and high-quality carbon spring steel, said the method

The quality carbon structural steel adopts two Arabia figures

(the average carbon content represented by several tens of thousands), or the figures and elements symbols of Arabia, as stipulated in Table 1

A combination of symbols.

Boiling steels and semi killed steels are marked with \"F\" and \"B\" at the rear of the mark, respectively\". For example, boiling steel with an average carbon content of 0.08% is indicated by its brand number

For \"08F\a semi killed steel with an average carbon content of 0.10% is expressed as \"10B\"\".

The steel (S, P < 0.035% respectively) is generally not symbol. For example, an average of 0.45% carbon containing killed steel is indicated by \"45\"\".

High quality carbon structural steel with high manganese content, adding manganese symbol after representing Arabia with average carbon content. For example, the average carbon content is

0.50%, manganese content of 0.70% to 1% of the steel, its brand is \"50Mn\"\".

The high quality carbon structural steel (S, P = 0.030%), and the symbol \"A in grades after\". For example: the average carbon content of 0.45% of the high quality

Carbon structural steel whose designation is \"45A\"\".

The premium quality carbon structural steel (S = 0.020%, P = 0.025%), and the symbol \"E in grades after\". For example, the average carbon content is 0.45%

Grade carbon structural steel, whose designation is \"45E\"\".

The quality carbon spring steel grade indication method and the high-quality carbon structure steel grade indication method are same (65, 70, 85, 65Mn steel in GB/T122)

2 and GB/T, 699, two standards exist at the same time.

3. Indicating method of alloy structural steel and alloy spring steel

The alloy structural steel grades are expressed in terms of Arabia numerals and standard chemical elements.

With two Arabia figures, the average carbon content (in the tens of millions) is placed on the head of the grade.

The content of alloy elements is indicated as follows: when the average content is less than 1.50%, only the elements are marked in the grade, and the content of the alloy is not marked in general

They ranged from 1.50% to 2.49%, from 2.50% to 3.49%, from 3.50% to 4.49%, from 4.50% to 5.49%,...... The alloy element is then written accordingly

2, 3, 4, 5.......

For example, the average content of carbon, chromium, manganese and silicon is 0.30%, 0.95%, 0.85% and 1.05% alloy structural steel, respectively, when the content of S and P is divided

Not less than 0.035%, the grade is expressed as \"30CrMnSi\".

High quality alloy structural steel (S, P concentrations were less than 0.025%), said in the rear plus grade symbol \"A\". For example: \"30CrMnSiA.\"\".

Super high grade alloy steel (S = 0.015%, P = 0.025%), in the rear plus symbol grade \"E\

Special alloy structural steel grades shall be marked in the head (or tail) table 1 of the brand, indicating the use of the product. For example, 30CrM for riveting purposes

NSi steel, steel ML30CrMnSi.

Alloy spring steel grades are the same as alloy structural steel.

For example, the average content of carbon, silicon and manganese is 0.60%, 1.75%, 0.75% of spring steel, and its brand is \"60Si2Mn\"\". senior

High quality spring steel is marked with \"A\" at the end of the grade, and its brand is indicated as \"60Si2MnA\"\".

4. Designation of grades of free cutting steels

Free cutting steels are represented by standard chemical elements, symbols defined in Table 1, and Arabia figures. The Arabia figures mean average carbon content

How many?.

Sulfur free cutting steel and sulfur and phosphorus free cutting steel, in the symbol \"Y\" and \"Arabia\" figures, no easy cutting element symbols.

For example: the average carbon content of 0.15% of the free cutting steel, its brand is expressed as \"Y15\"\".

II. Adding sulfur or adding sulfur and phosphorus to the cutting steel with high manganese content; adding manganese symbol after symbol \"Y\" and \"Arabia number\". For example, the average carbon content is

0.40%, easy to cut steel with manganese content of 1.20% ~ 1.55%, its brand is expressed as \"Y40Mn\"\".

The free cutting steels containing calcium, lead and other easily cutting elements are added with the symbol of easy cutting elements after the symbols \"Y\" and \"Arabia\" figures.

For example: \"Y15Pb\" and \"Y\" 45Ca\".

5. Indication method of non quenched and tempered mechanical structural steel

Non quenched and tempered mechanical structural steel is marked with \"YF\" and \"F\" on the grade heads, which indicate the non quenched and tempered mechanical structures of free cutting, non quenched and tempered mechanical structural steel and hot forging

Other content of the steel designation method is the same as that of alloy structural steel. For example: \"YF35V\" and \"F45V\"\".

6. Indication method of tool steel grades

Tool steel is divided into three categories: carbon tool steel, alloy tool steel and high speed tool steel.

Carbon tool steels are represented by standard chemical element symbols, symbols defined in Table 1 and Arabia figures. The Arabia figures mean average carbon content

A few thousandths of a thousand.

A. common manganese content carbon tool steel, in the tool steel symbol \"T\" after the Arabia digital. For example: carbon tool steel with an average carbon content of 0.80%,

The brand name is \"T8\"\".

B. high manganese content carbon tool steel, in tool steel

symbols \"T\" and \"Arabia\elements. For example: \"T8Mn.\"\".

C. high quality carbon tool steel, with \"A\" at the end of the grade\". For example: \"T8MnA.\"\".

Alloy tool steel and high speed tool steel

Alloy tool steel and high speed tool steel designation method are the same as those for alloy structural steel. Standard alloy elements and symbols are used

Arabia figures show, but generally do not indicate the average carbon content figures, such as: average carbon content of 1.60%, chromium, molybdenum, vanadium content were

11.75%, 0.50% and 0.22% alloy tool steel, its brand is \"Cr12MoV\"; the average carbon content is 0.85%, containing tungsten and molybdenum,

High speed tool steels with chromium and vanadium content of 6%, 5%, 4% and 2%, respectively, are certified as \"W6Mo5Cr4V2\"\".

If the average carbon content is less than 1%, you can use a Arabia figure to indicate carbon content (several thousandths). For example, the average carbon content is 0.8

0%. Alloy tool steel with manganese content of 0.95% and silicon content of 0.45%. The designation is \"8MnSi\"\".

Low chromium (average chromium content less than 1%) alloy tool steel, in the amount of chromium (in parts per thousand) before adding figures \"0\"\". For example, the average chromium content is 0.60%

Alloy tool steel, whose designation is \"Cr06\"\".

7. Plastic mould steel grade indication method

In addition to the \"SM\" sign on the head of the plastic mould steel, the remaining indication method is in accordance with the quality carbon structural steel and alloy tool steel grades

The same. For example: the average carbon content of 0.45% carbon plastic mold steel, its brand is \"SM45\"; the average carbon content of 0.34%, chromium content

Alloy plastic mould steel with a molybdenum content of 1.70%, and its brand name is \"SM3Cr2Mo\

8 、 bearing steel grade indication method

Bearing steel is divided into four categories: high carbon chromium bearing steel, carburizing bearing steel, high carbon chromium stainless bearing steel and high temperature bearing steel.

High carbon chromium bearing steel, in the head marked \"G\but does not indicate carbon content. Chromium content is a few thousandths, other alloy element is pressed by alloy

The alloy content of structural steel is indicated. For example: the average chromium content of 1.50% bearing steel, and its brand name is \"GCr15\"\".

Carburizing bearing steel, adopt alloy structural steel grade indication method, and mark \"G\" on the head of grade head\". For example: \"G20 CrNiMo.\"\".

High quality carburizing bearing steel, at the end of the brand plus \"A\"\". For example: \"G20CrNiMoA.\"\".

The high carbon chromium stainless bearing steel and high temperature bearing steel adopt stainless steel and

heat-resisting steel, and the brand head is not marked \"G\"\". Such as:

High carbon chromium stainless bearing steel \"9Cr18\" and high temperature bearing steel \"10Cr14Mo\"\".

9. Designation of stainless and heat-resisting steels

The grades of stainless and heat-resisting steels are specified by standard alloy elements and Arabia figures. They are used for cutting stainless steel, free cutting and heat-resisting steels

Head plus \"Y\"\".

That the average carbon content of a Arabia digital generally used (in a few dollars per thousand); when the average carbon content is 1% or more,

Use the two digit Arabia table

When the carbon content of the upper limit; < 0.10%, \"0\" as the carbon content; when carbon content limit is less than 0.03%, more than 0.01% (low carbon), with \"03\" table

As the carbon content; when the content of carbon cap (less than 0.01% is very low carbon), \"01\" as the carbon content. When the carbon content is not specified, the Arabia number is used

The word represents the upper limit of the amount of carbon contained.

Alloying elements; methods of expression; same as alloy structural steels. For example: the average carbon content of 0.20%, chromium content of 13% stainless steel, its brand said

For the \"2Cr13he average chromium content is 18%, and the nickel content is 9% chromium nickel stainless steel, its brand is expressed as \"0Cr18\"

\"Ni9\"; the upper limit of carbon content is 0.12%, and the average chromium content is 17%. The sulfur free cutting chromium stainless steel is certified as \"Y1Cr17\"

A high carbon chromium stainless steel with a carbon content of 1.10% and chromium content of 17%. Its brand is indicated as \"11Cr7\"; the upper limit of carbon content is 0.03%, and the average chromium content

For 19%, ultra low carbon stainless steel containing 10% nickel, the brand is \"03Cr19Ni10\"; the upper limit of carbon content is 0.01%, the average chromium content

For 19%, a low carbon stainless steel with a nickel content of 11% is indicated as \"01Cr19Ni11\"\".

In China, the standard of stainless steel is revised according to JIS standard, but the method of stainless steel is different from that of japan. We are

The alloy element and the average amount of C indicate that Japan is denoted by the letters used and the Arabia numeral. For example, stainless steel grades SUS202, SUS3

16, SUS430, S-steel (steel), U-use (use), S-stainless (stainless steel). Such as heat-resistant steel grades SUH309, SUH330, SUH

660, H-Heatresistins. Different numbers in the grade indicate different types of stainless steel. Japan says stainless steel is different from heat resistant steel

Products are added to the brand after the corresponding letters, such as stainless steel bars, SUS-B hot-rolled stainless steel plate SUS-HP, heat-resistant steel bars, SUHB heat-resistant steel plate, SUH

P. Britain, the United States and other western countries stainless steel grades of heat-resistant steel method of

expression is basically the same as in Japan, mainly in Arabia digital representation and figures

Is the same, that is, the brand is the same. Because Japan's stainless steel is made in america.

10. Indicating method of welding steel grades

Steel for welding including alloy steel and welding of stainless steel welding, welding of carbon steel, the brand that is used in all kinds of welding steel plate number

The Department adds the symbol \"H\"\". For example: \"H08\\"H08Mn2Si\

High grade welding steel. Mark \"A\" at the end of the grade\". For example: \"H08A\" and \"08Mn2SiA\"\".

11 、 silicon steel for electrical engineering

Number of numbers, letters and numbers.

The letter symbols for non oriented and oriented silicon steels are \"W\" and \"Q\" respectively\"

The thickness is in the front, the letters are placed in the middle, and the iron loss values are at the back, such as the 30Q113. Letter letters with high magnetic induction in oriented silicon steel\"

\"G\" and \"Q\" together, such as 30QG113

The number after the letter represents 100 times the value of the iron core (W/kg).

The letter \"G\" is said to be tested at a high frequency; without \"G\

30Q113 represents the maximum unit weight of cold rolled oriented silicon steel products at 50 Hz frequency, and the iron loss is 1.13W/kg.

The method of cold-rolled silicon steel is consistent with the Japanese standard (JISC2552-86), except that the letter symbols are different, for example, the orientation silicon steel brand 27Q140 and it

The corresponding JIS brand is 27G140, and the 30QG110 corresponding to JIS is 30P110 (G: stands for common materials, P: stands for high access

Tropism. The grade 35W250 of non oriented silicon steel, and the corresponding JIS brand is 35A250.