What material is H13?
In the fields of industrial manufacturing and mold processing, H13 is a widely used high-performance hot work mold steel. This article will introduce in detail the material properties, chemical composition, mechanical properties and application scenarios of H13 to help readers fully understand this important material.
1. Overview of H13 material
H13 is a chromium-molybdenum hot work die steel, which belongs to the hot work die steel grade in the American AISI standard. It has excellent thermal fatigue resistance, high temperature strength and wear resistance, and is often used in high temperature working environments such as die casting dies, forging dies and extrusion dies.
2. Chemical composition of H13
| element | Content(%) |
|---|---|
| Carbon(C) | 0.32-0.45 |
| Silicon (Si) | 0.80-1.20 |
| Manganese(Mn) | 0.20-0.50 |
| Chromium (Cr) | 4.75-5.50 |
| Molybdenum (Mo) | 1.10-1.75 |
| Vanadium(V) | 0.80-1.20 |
| Phosphorus(P) | ≤0.030 |
| Sulfur(S) | ≤0.030 |
3. Mechanical properties of H13
| Performance indicators | numerical value |
|---|---|
| tensile strength | ≥1000 MPa |
| Yield strength | ≥850MPa |
| Elongation | ≥10% |
| Impact toughness | ≥25 J/cm² |
| Hardness(HRC) | 48-52 |
| thermal conductivity | 24.3 W/(m·K) |
4. Heat treatment process of H13
The heat treatment process of H13 steel has a great impact on its performance, which mainly includes the following steps:
1.Annealing: Heated to 845-900℃, kept warm for 2-4 hours, slowly cooled to below 500℃ and released. The hardness can reach 180-220HB.
2.Quenching treatment: Preheat to 815-870℃, then heat to 995-1030℃, oil quenching or gas quenching, the hardness can reach 53-57HRC.
3.Tempering: Tempering at 540-650℃ twice, 2 hours each time, can obtain the best comprehensive performance.
5. Main application areas of H13
H13 steel is widely used in the following fields due to its excellent properties:
1.Die casting mold: Used for die-casting of aluminum, magnesium, zinc and other alloys.
2.Hot forging mold: Suitable for hot forging of various metals.
3.extrusion die: Used for extrusion molding of aluminum, copper and other non-ferrous metals.
4.plastic mold: Suitable for injection molding of high-temperature plastics.
5.Other applications: Can also be used for hot shearing knives, hot work punches and other tools.
6. Comparison between H13 and other hot work die steels
| Steel type | Main features | Applicable temperature |
|---|---|---|
| H13 | Good overall performance, heat fatigue resistance | ≤600℃ |
| H11 | Better toughness, slightly lower strength | ≤550℃ |
| H21 | High temperature strength, poor toughness | ≤650℃ |
| 3Cr2W8V | Good high temperature performance, high cost | ≤700℃ |
7. Analysis of the advantages and disadvantages of H13
Advantages:
1. Has good high temperature strength and hardness
2. Excellent thermal fatigue resistance
3. Better toughness and wear resistance
4. Small heat treatment deformation
5. Good processing performance
Disadvantages:
1. The high temperature oxidation resistance is not as good as that of tungsten hot work die steel
2. Hardness decreases rapidly at extremely high temperatures
3. The cost is higher than ordinary mold steel
8. Market conditions of H13
According to recent market research, the price of H13 mold steel is greatly affected by fluctuations in raw material prices. The current reference prices of H13 mold steel in the domestic market are as follows:
| Specifications | Price (yuan/kg) |
|---|---|
| Round steel (φ50-100mm) | 45-60 |
| Plate (20-100mm) | 50-65 |
| Module(300×300×100mm) | 55-70 |
9. Precautions for using H13
1. Proper heat treatment must be carried out before use
2. Avoid long-term use in environments exceeding 600℃
3. Regularly check the surface condition of the mold and perform timely maintenance
4. Pay attention to preheating when using to avoid thermal shock
5. Choose the right lubricant and cooling method
10. Development Trend of H13
As the manufacturing industry's requirements for mold performance continue to increase, H13 steel is also constantly optimized and improved. The future development directions of H13 include:
1. Improve purity and uniformity
2. Develop more optimized heat treatment processes
3. Application of surface treatment technology
4. Develop high-performance H13 improved steel grade
Summary: As a hot-work mold steel with excellent comprehensive properties, H13 performs well in high-temperature working environments and is an indispensable and important material in the field of mold manufacturing. Understanding the characteristics and correct use of H13 is of great significance to improving mold life and production efficiency.
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