1.1.2 Tool Steel’s naming

（1）Carbon tool steel ‘s name

1）China GB

According to GB/T 221 “steel products brand representation method” regulation, carbon tool steel grades by symbol “T” and the Arabic numeral, said the figures show that the average carbon content (in a few parts per thousand). Ordinary carbon tool steel, manganese content in the symbol “T” back to the Arabic numeral, such as T9. Carbon tool steel, high manganese content in the symbol “T” back to the Arabic numeral mark manganese element behind the symbols, such as T8Mn. High carbon tool steel with high quality, and at the end of the brand “A”, such as T12A.

  2）The United States ASTM

Carbon tool steel in the AISI – ASTM standard SAE standard brand representation method. Said its brand by the category of the letter “W” (water quenching tool steel) and sequence of Numbers, such as the W3. UNS (metal and alloy nameplate number system) system of brand series using a representative steel or alloy prefix five letters and Numbers, tool steel prefix letter “T”, said the first three digits classification of steel, and 2 digits after consistent with AISI – based on SAE brand series. Carbon tool steel (water quenching tool steel) for T723X X (X number).

3）Japanese   JIS

Carbon tool steel grades representation by the letters “SK” and digital representation. Letter “SK” at the back of the digital serial number, such as brand SKI. Such as still need to say the product shape and heat treatment state, the additional corresponding symbols behind the brand.

 4）Germany DIN

According to DIN17006 brand representation of the system, and carbon tool steel grades by the letter “C” add the letter “W” and figures and Numbers, the C W X X X. The back of the letter C figures show that the average carbon content (per meter); Behind the letters W figures show that the level of quality, shown by the following:

W1 – grade 1 quality, sulfur, phosphorus content is not more than 0.020%;

W2-2 levels of quality, sulfur, phosphorus content is not more than 0.030%;

W3 – level 3 quality, sulfur, phosphorus content greater than 0.040%；

WS – special purpose tool steels. Such as brand C80W1.

According to DIN 17007 system of digital materials, methods, materials, composed of 7 digits. In one category or another, one said, “1” for the steel; Steel grade categories, “said 2, 3 a 15 ~ 18” as the carbon tool steel; 4, 5, no certain rule or according to the content of alloy elements according to their carbon content or; 6, 7 additional Numbers, generally will not be marked in the standard, the sixth said steel smelting and casting process, the 7th said heat treatment condition. Such as material number C80W1.

  5）GOST  ГOCT

Carbon tool steel grades with the letter “y”, behind the figures show that the average carbon content (one thousandth of a few meter), such as y7. Carbon tool steel, high manganese content after the symbol “y” and digital manganese element code “Г”, such as y8 Г. High quality carbon tool steel, in brand weibo plus symbol “A”, such as y8 Г A.

6）England  BS

Water quench carbon tool steel grades with “BW X”, said the “X” to 1 digit, according to different brand serial number. Level composition similar to A set of brand, in order to distinguish between, behind the Numbers to add an “A”, “B”, “C”, etc.

7）France  NF

Of alloy tool steel (including tool steel) to join a small amount of vanadium and chromium in the brand symbol representation in front with carbon “C”, for the average carbon number behind (very few), and back again into E X U different sulfur, phosphorus content, the “X” for the digital, E2U said each not greater than 0.020% sulfur, phosphorus content, E3U said each not greater than 0.025% sulfur, phosphorus content, E4U sulfur, phosphorus content greater than 0.035%.

8）European standard  EN

According to a steel grades EN027-1 system with symbol list, carbon tool steel, alloy tool steel) brand of prefix letter as “C”, the Numbers behind the average carbon content (in per meter). According to EN 10027-2 steel grades system with figures show that the number of materials, carbon tool steel, alloy steel) the number of brands, 1 bit is “1” said steel; Group number 2, 3 for steel, tool steel for 15-18 “;” 4, 5, a sequence number.

9）International Standard   ISO

Carbon tool steel, alloy tool steel) brand of prefix letter as “C”, the Numbers behind the average carbon content (per meter), suffix letters to U, such as C105U.