AISI S7 Hi-Chromium Carbon Steel

S7 steel is a type of tool steel with high carbon and chromium content, which is also one of the ASTM standard steels in the United States. Due toits high hardness, good wear resistance, excellent mechanical damage resistance and easy heat treatment, it is widely used in the field of cutting tool and thermoforming mould manufacturing. For example, punches, forging dies, hammers, chisels, jig moulds, cutting knives, etc. can be made from this material. At the same time, it is also a high-load impact resistant tool steel and medium carbon alloy steel that can still maintain stability under high load or high-speed cutting conditions. In short, S7 steel is widely used in various occasions that require high strength and high wear resistance due to its unique composition and excellent performance.

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L7 steel is a special type of alloy tool steel that falls into the category of so-called "oil-hardening steels" (O-series) and is popular for its toughness and resistance to mechanical wear. This steel is ideal for applications where tools or components are subjected to high impact stresses.

Chemical composition:

• Carbon: 0,55-0,65 %.
• Manganese: 0,70-1,00 %
• Chromium: 0.70-1.20%
• Molybdenum: 0,40-0,70 %
• Nickel: 1,25-1,75 %
• Vanadium: 0,15-0,30 %
• Silicon: 0.50%

Features:

1. Toughness:
• L7 steel is known for its exceptional ability to withstand impact loads, making it ideal for applications requiring extreme strength.
2. Hardness:
• After heat treatment, it reaches a hardness of around HRC 55-60, which depends on the specific hardening method.
3. Wear resistance:
• Due to its chromium and molybdenum content, it has high wear resistance.
4. Thermal stability:
• L7 steel retains its mechanical properties even at higher temperatures.
5. Machining:
• It is easily machinable in the annealed condition, which facilitates its processing prior to heat treatment.

Uses:

• Tools and moulds:
• It is used to make forming tools, chisels, punches, dies or dies.
• Components for heavy industry:
• Used for hammers, pins and other components subject to impact.
• Automotive:
• Used for the manufacture of crankshafts, pistons and other engine components.
• Blade tools:
• Its toughness makes it suitable for knives and machetes designed for heavy-duty use.

Advantages of L7 steel:

• High toughness and strength.
• Excellent wear and fatigue resistance.
• Good temperature resistance.

Disadvantages:

• Lower corrosion resistance than stainless steels.
• Higher cost compared to non-alloy steels.

L7 steel is an excellent choice for applications where a highly durable material capable of handling extreme shock and wear is required. It is popular among tool and industrial component manufacturers due to its versatility and reliability.