Marking of alloy tool steel

Properties, density and specific heat of steel
Steel Welding
Annealing, hardening and heat treatment of steel
Steel marking
Use of steel

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General rules

GOST 5950-2000 (the bulk of tool alloy steels of this type) and GOST 19265-73 ( for high speed steels ) define the marking of tool alloy steels. In the first case the marking is traditional and includes an alphanumeric designation of the content and type of alloying elements. GOST 5950-2000 covers the following grades of tool alloy steels:

  • low-alloy tool steels - 8XF, 9XF, 9XFM,
  • medium-alloy tool steels - HV4F, 9H5VF, 8H6NFT, H6VF, 7HG2VMF, 6H6VMF, 6H4M2FS, 11H4V2MFZ2, 8H4V2MFZ2, 7X3, 8X3, 5HNM, 5HNV, 5HNVS, 4HMFZ, 4H5V2FS 4Х5МФС, 4Х5МФ1С, 4ХЗВМФ, 4Х4ВМФС, ЗХЗЗФ, 4Х2В5МФ, 5ХЗЗМФС, 5Х2МНФ, ЗХ2МНФ, 4ХМНФ, 5ХВ2СФ, 6ХВ2С, 6ХМФС;
  • High-alloy tool - Kh12, Kh12VMF, Kh12MF, Kh12F1, 05 Kh12Ni6D2MFSGT. 11HF, 13H, V2F, 9X1, X, 12X1, 9HS, HGS, 9HVG, HVPHVSGF, 9G2F, 4HS, 6HS, 6HVG;

Alphabetic marking

In the grades, the first digits indicate the mass fraction of carbon in tenths of a percent. They may not be indicated if the mass fraction of carbon is close to or greater than one. Letters mean: D for manganese, C for silicon, X for chromium, B for tungsten, F for vanadium, H for nickel, M for molybdenum. Numbers after the letters mean the average mass fraction of the corresponding alloying element in whole units. The absence of a digit means that the mass fraction of an alloying element is about 1%. In some cases the mass fraction of an alloying element is not given if it does not exceed 1.8%. Evek GmbH offers to buy alloyed structural steel at an affordable price in a wide range. We provide delivery of products to any point on the continent. The price is optimal.

Marking of steels, GOST 19265-73

In the grades of steel alloys letters and numbers mean: P - fast-cutting; the number following the letter - the average mass fraction of tungsten; M - molybdenum, F - vanadium, K - cobalt, A- nitrogen; digits following the letters mean the mass fraction of molybdenum, vanadium, cobalt, respectively; Sh - electroslag remelting.
The designation of steel grades does not indicate the mass fraction:
chromium - at any mass fraction,
molybdenum - up to 1% inclusive,
vanadium - in steel grades Р18, Р6М5, Р9К5, Р6М5К5, Р9М4К8 and Р2АМ9К5,
nitrogen - in steel grades 11Р3АМ3Ф2 and Р2АМ9К5.
Steel grades Р6М5 and Р6М5Ф3 are produced upon customer's request with nitrogen alloying (mass fraction of nitrogen from 0,05% to 0,10%). In this case, the designation of grades - R6AM5 and R6AM5F3.

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