8 Shearing Blade Materials You Don’t Know

1. LD (7Cr7Mo2V2Si) cold-work die steel

Features and application:

LD (7Cr7Mo2V2Si) is a high-quality and tough cold work die steel that was initially developed for cold heading dies. Its code, “cold heading,” reflects its use.

In actual production, LD steel is used for the manufacture of cold heading, cold extrusion, and cold die tools that require high toughness. It has better performance than Cr12 and W6Mo5Cr4V2.

LD steel is a matrix-type code mold steel, characterized by high strength and wear resistance, high bend strength, excellent cold and hot processing technology, minimal heat treatment distortion, and versatility.

With its superior strength and toughness, good wear resistance, and the ability to manufacture a range of cold cutting shears blades, LD steel has a longer service life of more than ten times that of other materials like Cr12MoV, W18Cr4V, W6Mo5Cr4V2, Cr12, GCr15, and 9SiCr.

Mechanical properties:

  • Blade hardness: HR57 ~ 63

Heat treatment specifications:

  • Quenching temperature 1100 ~ 1150 ℃, tempering temperature 530 ~ 540 ℃

2. H13 (4Cr5MoSiV1) hot work die steel

Features and application:

H13 Steel (4Cr5MoSiV1) is a high-quality air-hardening die steel with excellent toughness and resistance to hot and cold fatigue. It is not prone to thermal fatigue cracking, has strong anti-adhesion properties, and experiences minimal interaction with molten metal, making it widely used in the manufacture of blades for hot upsetting, hot extrusion, and thermal shear machines.

Performance-wise, H13 Steel is similar to 4Cr5MoSiV Steel, but its high vanadium content gives it superior temperature performance (up to 600 degrees) compared to 4Cr5MoSiV Steel.

It is a representative steel used in hot work die steel and is suitable for hot shearing of steel plates at temperatures below 800°C.

Mechanical properties:

  • Blade hardness: HR56 ~ 58

Heat treatment specification:

  • quenching temperature 1050 ~ 1080 ℃, tempering temperature 530 ~ 560 ℃

3. 6CrW2Si alloy tool steel

Features and application:

6CrW2Si is a high-quality alloy tool steel that is made by adding a certain amount of tungsten to chromium-silicon steel. The addition of tungsten results in finer grains during quenching, leading to increased toughness in tempering conditions.

When compared to 4CrW2Si steel and 5CrW2Si steel, 6CrW2Si steel has a higher quenching hardness and improved high-temperature strength. This type of steel is commonly used to produce hydraulic shear blades that need to withstand impact loads and require high wear resistance. It can be used for shearing ordinary steel and hard-textured stainless steel plates.

Mechanical properties:

  • Blade hardness: HRC56 ~ 60

Heat treatment specification:

  • Quenching temperature 860 ~ 900 ℃, tempering temperature 285 ~ 229 ℃

4. W6Mo5Cr4V2 high-speed tool steel

Features and application:

W6Mo5Cr4V2 is a high-quality, high-speed tool steel, also known as 6542, commonly referred to as “high-speed steel.” It is a high-carbon, high-alloy tool steel designed for high-speed cutting.

The tungsten-molybdenum series is a representation of high-speed steel, with a high hardness, wear resistance, and thermal hardness (also known as red hardness). At temperatures up to 500 to 600 degrees Celsius, the cutting tool‘s hardness does not decline significantly.

Compared to W18Cr4V, W6Mo5Cr4V2 has similar high-temperature hardness, but is more prone to oxidization and decarburization, so it should be carefully handled during thermal processing and heat treatment.

This steel can be cut at higher speeds than low-alloy cutting tool steel, making it ideal for blades that require high cutting speeds, heavy loads, and high working temperatures. It is suitable for sheet shearing in various conditions.

Mechanical properties:

  • Blade hardness: HR62 ~ 68

Heat treatment specifications:

  • Quenching temperature 1210 ~ 1230, tempering temperature 540 ~ 560

5. Cr12MoV die steel

Features and application:

Cr12MoV is a high-quality mold steel that boasts greater hardenability, hardness after quenching and tempering, strength, and toughness than CR12. It is capable of complete hardening for diameters below 300 to 400mm, with minimal quenching deformation. However, it has poor high-temperature plasticity.

Cr12MoV is mainly used to produce hydraulic shears blades with larger cross-sections, complex shapes, and heavy workloads. The blade made of Cr12MoV can be used for cutting over 800,000 times and is suitable for cutting high hardness plates such as stainless-steel and silicon steel sheets.

Mechanical properties:

  • Blade hardness: HRC56 ~ 60

Heat treatment specifications:

  • Quenching temperature of 950 ~ 1000 ℃, tempering temperature of 200 ℃ ~ 250 ℃

6. 9CrSi alloy tool steel

Features and application:

9CrSi is a high-quality low-speed, low-alloy cutting tool steel known for its brittleness and hardness, as well as its tendency to experience heat sensitivity, which leads to surface hardening and a higher risk of cracking.

It is a commonly used low-alloy tool steel in measuring and cutting tools, boasting high quenching and hardenability, and stability during tempering.

9CrSi can be used to manufacture hydraulic shear blades with a complex shape, minimal deformation, high wear resistance, and low-speed cutting capability.

It is ideal for shearing ordinary A3 and Q235 boards.

Mechanical properties:

  • Blade hardness: HRC55 ~ 58

Heat treatment specifications:

  • Quenching temperature 820 ~ 860 ℃, tempering temperature 180 ~ 200 ℃

7. T10A carbon tool steel

Features and application:

T10A is a high-quality carbon structural steel with high strength and wear resistance but low hot hardness, quenching and hardenability, and high quenching deformation. It is suitable for manufacturing shear blades in poor cutting conditions with high wear resistance requirements and not subject to sudden and severe vibrations, with a need for a certain level of toughness and a sharp knife edge. It is used in the cutting of ordinary A3 plates.

Mechanical properties:

  • Blade hardness: HRC52 ~ 55

Heat treatment specifications:

  • Quenching temperature of 770 degrees, tempering temperature of 200 degrees

8. 45# steel carbon structural steel

Features and application:

45# is a high-quality carbon structural steel that is widely used in machinery manufacturing. It has good cutting characteristics and mechanical properties.

However, as a medium carbon steel, 45# steel has poor quenching performance and is not suitable for use in the manufacture of plate cutting machine blades. Its heat treatment hardness is only between HRC 42-46, so the typical approach is to use a combination of quenching and tempering and high-frequency surface quenching. The wear resistance is slightly worse than carburizing, making it suitable for cutting non-metallic sheets.

Mechanical properties:

  • Blade hardness: HRC42 ~ 56

Heat treatment specifications:

  • Quenching temperature of 840 degrees, tempering temperature of 300 degrees
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Shane
Author

Shane

Founder of MachineMFG

As the founder of MachineMFG, I have dedicated over a decade of my career to the metalworking industry. My extensive experience has allowed me to become an expert in the fields of sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. I am constantly thinking, reading, and writing about these subjects, constantly striving to stay at the forefront of my field. Let my knowledge and expertise be an asset to your business.

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