High Strength S690QL1 Steel

S690QL1 steel is characterized by its low carbon content, high chromium and molybdenum content, and excellent weldability. It is also resistant to abrasion, impact, and fatigue, making it ideal for use in harsh environments. Overall, high strength S690QL1 steel is an excellent choice for applications that require both strength and toughness, and has gained popularity among engineers and designers for its performance and reliability.

High strength S690QL1 steel is a quenched and tempered fine-grained structural steel that has a minimum yield strength of 690 MPa (100 ksi) and a good toughness at low temperatures. The steel is often used in demanding applications such as heavy lifting equipment, cranes, bridges, offshore platforms, and mining equipment.

The thickness of S690QL1 steel ranges from 6 mm to 150 mm, or even up to 200 mm for some applications. The chemical elements of S690QL1 steel (according to EN 10025-6) are:

- Carbon (C): maximum 0.20%

- Silicon (Si): maximum 0.80%

- Manganese (Mn): maximum 1.70%

- Phosphorus (P): maximum 0.025%

- Sulfur (S): maximum 0.015%

- Chromium (Cr): minimum 0.30%

- Nickel (Ni): maximum 2.50%

- Molybdenum (Mo): minimum 0.20%

- Vanadium (V): minimum 0.06%

- Titanium (Ti): maximum 0.05%

- Boron (B): maximum 0.005%

The high-strength steel S690QL1 is primarily used in heavy machinery, construction, and transportation equipment due to its excellent strength-to-weight ratio, toughness, and durability. The productive process of S690QL1 steel involves the following steps:

1. Melting: The first step in producing S690QL1 steel is to melt the raw materials, including iron, carbon, and alloying elements such as manganese, silicon, and chromium, in an electric arc furnace or a basic oxygen furnace.

2. Refining: The melted steel is then refined to remove impurities such as sulfur, phosphorus, and nitrogen that can weaken the final product. Refining is usually done through a process called ladle treatment, where the steel is stirred and injected with various reactive materials.

3. Casting: Once the refining process is complete, the S690QL1 steel is cast into various shapes and sizes, depending on the final application. The most common casting method used for S690QL1 steel is continuous casting, which involves pouring the molten steel into a water-cooled mold to form a continuous strand.

4. Rolling: After casting, the S690QL1 steel is rolled into the desired thickness and shape using a rolling mill. This process involves passing the steel through a series of rollers that compress and shape it to meet specific design requirements.

5. Heat Treatment: To achieve the desired strength and toughness properties, S690QL1 steel undergoes heat treatment after rolling. This involves heating the steel to a specific temperature and soaking it for a defined time before cooling it down slowly.

6. Surface Treatment: Finally, S690QL1 steel undergoes surface treatment, such as shot blasting or painting, to enhance its resistance to corrosion and improve its aesthetic appearance.

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