AISI M7 / 1.3348 / DIN S2-9-2

Обозначение по стандартам

Химический состав (в мас.%)

Описание
M7 is one of the High Speed Tool Steels in the molybdenum alloy family, with tungsten, chromium and vanadium for strengthening. It has good hardenability and is very wear resistant. Very high resistance to softening at elevated temperatures and good toughness. Deep hardening response.

Применение
M7 is widely used for cutting tools in machining operations. Sendzimir rolls, segment and circular cutters, profile cutting tools, thread cutting drills and cold forming tools.

Физические свойства (средние значения) при температуре окружающей среды
Модуль упругости [10³ х Н / мм²]: 217
Плотность [г / см³]: 8.30
Теплопроводность [Вт / мК]: 19.0
Удельное электрическое сопротивление [Ом мм²/ м]: 0.65
Удельная теплоемкость [Дж / гК]: 0.46

Коэффициент линейного теплового расширения 10^-6oC^-1

Диаграмма непрерывного преобразования охлаждения (CCT)

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Time-Temperature Transformation (TTT) Diagram

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Мягкий отжиг
Нагреть до 820-880^oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 230-280.

упрочнение
Heat up to 450-600^oC, preheat to 850^oC and then to 1050^oC. Harden from a temperature of 1180-1220^oC followed by oil, air quenching or warm bath at 550^oC. Твердость после закалки - 64-66 HRC.

закал
Tempering temperature: 3 x 1 hour at 540-560^oC. Hardness after tempering is min 64 HRC.

Ковка
Температура горячей штамповки: 1100-900^oC.

Cold Working: In the annealed condition M7 may be cold worked by conventional methods.

Machinability
Machinability is medium, rating about 60% that of the W group water hardening low alloy tool steels at 100% for comparison.

Устойчивость к коррозии
Although this alloy contains chromium and molybdenum it is still a steel and thus will corrode. It should be protected from rusting.

сварка
This is a complex alloy but is weldable. Consult the supplier for procedures and details.

Изготовленные формы: Пожалуйста, ознакомьтесь с программой продаж.

Юридическое предупреждение
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.