Carbon Tool Steel Grades and GOST 1435

Understanding GOST carbon tool steel grades

GOST 1435 covers carbon tool steels identified by designations such as U7, U8, U9, U10, U11, U12 and U13, with additional suffixes used for quality or processing distinctions. In general, the number is associated with nominal carbon content in tenths of a percent. The exact chemical limits, quality level, delivery condition and test requirements must be taken from the specified edition of the standard.

These steels are used for tools and wear components whose performance is developed through heat treatment. Lower-carbon grades within the family may offer greater toughness, while higher-carbon grades can provide higher attainable hardness with reduced tolerance for impact. Section size, quench severity, tempering and final geometry strongly affect actual results.

U8, U10 and U12 selection

U8 is often considered for hand tools, punches and components requiring a balance of hardness and toughness. U10 may be selected for cutting, measuring or forming tools under moderate loading. U12 is associated with applications emphasizing high hardness and wear resistance. These examples are general; the drawing, heat-treatment procedure and applicable standard govern the final choice.

A direct U.S. or European equivalent should not be assigned from the grade name alone. Similar chemistry does not guarantee identical cleanliness, hardenability, dimensional range or delivery condition. If substitution is allowed, provide the required chemistry and mechanical or hardness requirements for review.

Product forms and quotation details

Evek LLC reviews requirements for round or flat bar, strip, sheet, plate, wire and other available forms. Send the complete grade designation, GOST edition, form, dimensions, condition, quantity, tolerances, surface finish, decarburization limits, heat-treatment condition, testing and material certificate requirements.

If the part will be machined before hardening, include machining allowance and the required finished hardness or heat-treatment route. For an equivalent-grade request, state whether an engineering-approved alternative is acceptable and identify the controlling ASTM, SAE, AISI, DIN or EN requirements.

Related steel products

Review tool steel products, specialty steel grades and alloy steel forms.

Request a U.S. quote

Evek LLC serves customers throughout the United States. Typical delivery is 2-3 weeks, subject to grade, form, condition, dimensions, quantity and availability.

Contact Evek LLC with the full designation and U.S. delivery ZIP code.