H13 Steel is defined as Cr-Mo-Si-V tool Steel as per American standard ASTM A681.
As the most widely used and most representative hot-work die steel, H13 steel has high toughness, cold and hot fatigue resistance and high thermal strength when the temperature is less than 600℃.
As a hot working die steel with both strength and toughness, H13 steel is not easy to produce thermal fatigue cracks and has a relatively high service life when used as a hot extrusion die. It is also commonly used to manufacture forging dies with large impact load, copper aluminum alloy die-casting dies, high-speed precision forging dies and forging press dies.
H13 STEEL SUPPLY FORM & SIZE & TOLERANCE
Hot Forged Round bar:Φ80-Φ1000mm
Hot Rolled Round bar:Φ16-Φ130mm
Hot Forged Square bar: Max Thickness:500mm
Flat bar/Blcoks:Thickness :120-800mm ,Width:120-1500mm
|Surface Finish||Black-Forged||Black-Rolled||Turned||Grinding||Polished||Peeled||Cold Drawn|
|Tolerance||(0，+5mm)||(0，+1mm)||(0，+3mm)||Best h9||Best h11||Best H11||Best H11|
H13 STEEL CHEMICAL COMPOSITION
|H13||0.32-0.45||0.8-1.25||0.20-0.60||≤ 0.03||≤ 0.03||4.75-5.50||1.1-1.75||0.8-1.2|
H13 STEEL RELATED STANDARD & EQUIVALENT GRADE
China/GB 1299: 4Cr5MoSiV1
Germany/DIN 17350: 1.2344
Japan/JIS G4404: SKD61
H13 STEEL FORGING
The forging process performance of H13 steel is very poor. Because it is hard and brittle, if the forging process is not arranged properly, it is easy to produce cracks during forging and lead to scrap.
The forging temperature range of H13 steel is very narrow, only 150~200℃, so we must strictly control its forging temperature.
- Initial Forging Temperature：1065-1175℃
- Final Forging Temperature：850-900℃
- Forging Ratio：above 4:1
- Post-Forging Treatment:H13 steel needs to be annealed after forging.After heating to 860 ℃ for heat preservation,cool slowly, the cooling rate is about 30 ℃/h,and after cooling to 400~500°C in the furnace, air cooling.
H13 STEEL HEAT TREATMENT
Critical Temperature for Heat Treatment of H13 Steel
H13 Steel Annealing
H13 steel belongs to hypereutectoid steel, and the commonly used annealing processes are complete annealing, isothermal spheroidizing annealing and stress relief annealing.
- H13 Steel Complete Annealing
The full annealing temperature of H13 steel is 845-900℃,and the holding time is 3-4 hours,and then furnace cooled to 500℃ with the rate 22℃/h max.Annealed hardness is usually 192-229HBW
- H13 Steel Isothermal Spheroidizing Annealing
The isothermal spheroidizing annealing temperature of H13 steel is 845-900 ℃, which is kept for 2-4 hours and then cooled to 700-740 ℃ with the furnace, and kept for 3-4 hours.Finally cooling to below 500°C in the furnace and then air-cooling.
- H13 Steel Stress Relief Annealing.
For parts with complex shape and structure, H13 steel needs to undergo stress relief annealing.The temperature is controlled at 730-760 ° C, and it is cooled in the furnace after holding for 2 hours.
H13 Steel Quenching & Tempering
H13 Steel Quenching Details:
- Pre-heat temperature:800-850℃
- Quenching temperature：1020-1050℃
- Quenching medium: air or oil
- Quenching hardness:55-58HRC
H13 Steel Tempering Details:
- Tempering temperature:560-580℃
- More than twice of tempering is necessary
H13 square steel bar