AISI H13 Steel

AISI H13 Steel

Steel name: AISI H13
Table No.: 1722
AISI/SAE designation: AISI H13
Chemical composition in weight %: 0.32-0.45% C, 0.80-1.20% Si, 0.20-0.50% Mn, max. 0.030% P, max. 0.030% S, 4.75-5.50% Cr, 1.10-1.75% Mo, 0.80-1.20% V
Steel group: Hot work tool steels
Properties: No data
Applications: Use this grade for application where drastic cooling is required during the operation, and where high red hardness and resistance to heat checking are important. This grade has found wide acceptance for die casting for zinc, white metals, aluminum and magnesium. It is widely used for extrusion dies, trimmer dies, gripper dies, hot shear blades and other hot work applications.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: In a controlled atmosphere, preheat thoroughly at 1300° F - 1400° F. Then heat to 1850°F and hold for one hour per inch of greatest cross sectiob. Quench in still air and temper immediately. When maximum hardness is the primary requirment, H-13 may be oil quenched, though when oil quenched this grade is vunerable to cracking and has the same distortional characteristics as an oil hardening tool steel.
Tempering: For hot work applications, H-13 is used in the hardness range HRC 38 to 48. Typical hardness range for die casting is HRC 44 to 48 requiring a temper at approximately 1110°F. For improved shock resistance, the steel is often tempered at temeratures approachung 1150°F, resulting in hardness of HRC 40-44. The steel should be held at the tempering temerature for at least two hours per inch of greastest cross section. All hot work steel should be tempered at a minimum of 50 degrees above the expected maximum operating temperature of the tool or die. Double tempering, with the second temper 25 to 50 degrees lower than the first temper is always advisable, especially where heat checking is a problem. Hardness tests were made on 1-inch round specimens of H-13, which were air quenched from 1850°F and tempered for two hours at various temperatures. The results in the tempering chart may be used as a tempering guide keeping in mind that tools of heavy section or mass may be serveral points lower in hardness.

Table Tempering Temperature (F) - Hardness (HRC)

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