Product

China H13 Mold steel

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China H13 Mold steel is chromium hot work tool steels which are widely used in hot and cold work tooling applications. H13 tool steel is classified as group H steels by the AISI classification system. This series of steels start from H1 to H19.

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Chemical composition

C Si Mn P S Cr Mo V
0.32-0.45 0.8-1.25 0.2-0.6 ≤0.03 ≤0.03 4.75-5.5 1.1-1.75 0.8-1.2

Equivalent Grades of Steel

USA Germany Japan
ASTM DIN JIS
H13 1.2344 SKD61

AISI H-13 tool steel is characterized by

  • Good resistance to abrasion at both low and high temperatures
  • High level of toughness and ductility
  • Uniform and high level of machinability and polishability
  • Good high-temperature strength and resistance to thermal fatigue
  • Excellent through-hardening properties
  • Very limited distortion during hardening

Mechanical properties of Steel

  • Tensile strength:1200-1590 MPa
  • 0.2% Offset)Tensile Strength, Yield:1000-1380MPa
  • Modulus of elasticity: 215 Pa
  • Poisson’s ratio: 0.27-0.30

Application

  • Mold
  • supporting item
  • stem
  • shrink ring
  • Wear parts

Heat treatment conditions

  • Annealing

Heat slowly to 1550°-1650°F, hold until entire mass is heated through, and cool slowly in the furnace (40F per hour) to about 1000°F, after which cooling rate may be increased. Suitable precautions must be taken to prevent excessive carburization or decarburization.

  • Stress Relieving

When desirable to relieve the strains of machining, heat slowly to 1050°-1250°F, allow to equalize, and then cool in still air (Strain Relieving). Â

  • Preheat Prior to Hardening

Warm slightly before charging into the preheat furnace, which should be operating at 1400°-1500°F.

  • Hardening

H13 tool steel is a steel having very high hardenability and should be hardened by cooling in still air. The use of a salt bath or controlled atmosphere furnace is desirable to minimize decarburization, and if not available, pack hardening in spent pitch coke is suggested. The temperature employed is usually 1800°-1850°F, depending on size section.

  • Quenching

Quench in still air or dry air blast. If complicated forms are to be hardened, an interrupted oil quench can be used. Quench part in oil and remove from bath when it just loses its color (1000°-1100°F). Finish cooling to below 150°-125°F in air, then temper immediately.

  • Tempering

Tempering practice may vary with size and application, but is usually performed in the range of maximum secondary hardness or higher. Double tempering is recommended. The results below is H13 that was air quenched from 1800°F and tempered for 4 hours at various temperatures. The results may be used as a guide, keeping in mind that parts of heavy section or mass may be several points lower in hardness.

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