2015 hot sale in China Q235 high quality Prime Steel billet

2015 hot sale in China Q235 high quality Prime Steel billet

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Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 25 m.t.

Supply Capability:: 800000 m.t./month

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Quick Details

Place of Origin:	Hebei, China (Mainland)	Brand Name:	CNBM	Model Number:	steel billets
Grade:	Q235,Q195,20MnSi etc.	Chemical Composition:	2015 hot sale in China Q235,Q195, 20MnSi high quality Prime Steel bil	Shape:	Square, Square
Length:	3-12m or as your request	Standard:	AISI, ASTM, BS, DIN, GB, JIS	Technique:	Hot Rolled
Dimensions:	120-150	Alloy Or Not:	Is Alloy	Secondary Or Not:	Non-secondary
Type:	prime quality steel billet	Quality:	Prime high quality	Application:	Wire rod , rod , deformed bars , profile steel etc.
Dimension:	50mm-180mm or as your request	Price:	Competitive	Service:	Professional and good
Price terms:	CFR, CIF, FOB	Terms of payment:	L/C at sight or T/T	Delivery:	on time

Packaging & Delivery

Packaging Details:	standard packing for export
Delivery Detail:	within 25-45 days after receiving deposits or original LC

2015 Hot Sale in China Q235 high quality Prime Steel billet , mild steel billet

2015 hot sale in China Q235 high quality Prime Steel billet

Specifications

1.Grade: Q195, Q235, 20MnSi etc.
2.Terms of payment: TT or L/C at sight etc.
3.Size: 120-150 or as your request

Q: How are steel billets used in the production of oil and gas machinery?: Steel billets are used in the production of oil and gas machinery as a primary raw material for manufacturing various components, such as gears, shafts, valves, and casings. These billets are heated and shaped through processes like forging and rolling to create the desired shape and strength needed for the machinery. Additionally, steel billets provide the necessary durability and corrosion resistance required to withstand the harsh operating conditions in the oil and gas industry.

Q: How has the demand for steel billets changed over time?: The demand for steel billets has experienced fluctuations over time, influenced by various factors. Historically, there has been a steady growth in the demand for steel billets due to the increasing industrialization and urbanization worldwide. As construction and infrastructure projects expanded, the demand for steel billets, which serve as the raw material for various steel products, also increased. However, the demand for steel billets has not been immune to economic cycles. During periods of economic downturns, such as the global financial crisis in 2008, the demand for steel billets declined as construction and manufacturing activities slowed down. This led to a surplus of steel billets in the market, resulting in decreased prices and reduced demand from steel mills. In recent years, the demand for steel billets has been influenced by global trends and geopolitical factors. The increasing focus on sustainable development and environmental concerns has led to a growing demand for green construction materials, including steel produced from recycled sources. This has prompted steel manufacturers to adapt their production processes to meet these demands and ensure the availability of environmentally friendly steel billets. Moreover, geopolitical factors such as trade disputes and tariffs have also impacted the demand for steel billets. The imposition of tariffs on steel imports by certain countries has led to a decrease in demand for imported steel billets, while simultaneously increasing demand for domestically produced steel billets. Furthermore, the COVID-19 pandemic had a significant impact on the demand for steel billets. Lockdowns, travel restrictions, and disrupted supply chains caused a decline in construction activities and manufacturing output, leading to a decrease in demand for steel billets. However, as economies recover and governments implement stimulus measures to boost infrastructure projects, the demand for steel billets is expected to gradually rebound. In summary, the demand for steel billets has experienced fluctuations over time, influenced by economic cycles, global trends towards sustainability, geopolitical factors, and the COVID-19 pandemic. The long-term growth in demand for steel billets remains closely tied to construction and infrastructure development, making it vital for steel manufacturers to adapt to changing demands and market conditions.

Q: How are steel billets inspected for surface finish?: To ensure quality and compliance with industry standards, various methods and techniques are employed to inspect the surface finish of steel billets. Visual inspection is a common approach, where trained inspectors carefully examine the billet's surface for any defects, such as scratches, pits, cracks, or irregularities. This examination is typically conducted under appropriate lighting conditions to enhance defect visibility. Another method employed is non-destructive testing (NDT), which encompasses techniques like magnetic particle inspection (MPI) and liquid penetrant inspection (LPI). MPI involves the application of a magnetic field to the billet, followed by the use of a magnetic particle suspension to reveal surface defects by adhering to them. On the other hand, LPI involves the application of a liquid penetrant solution to the billet's surface, which is subsequently removed and followed by the application of a developer to highlight any defects. Ultrasonic testing (UT) is also commonly utilized to inspect the surface finish of steel billets. UT employs high-frequency sound waves transmitted through the billet, with any reflected waves analyzed to detect surface or subsurface defects. This method provides detailed information about the surface condition and can even detect minute flaws. Additionally, surface profilometers can be employed to measure the roughness of the billet's surface. These devices utilize a stylus or laser to measure height variations on the surface, thereby providing data on roughness and texture. In summary, a combination of visual inspection, NDT techniques, and surface profilometry is employed to conduct thorough inspections of steel billets' surface finish. These inspections play a crucial role in ensuring that the billets meet the required surface finish standards and are suitable for further processing or manufacturing.

Q: What are the main factors affecting the corrosion resistance of carbon steel billets?: The main factors affecting the corrosion resistance of carbon steel billets are the composition of the steel, the presence of impurities or alloying elements, the surface condition and finish, the environment (including humidity, temperature, and exposure to corrosive agents), and the protective coatings or treatments applied to the billets.

Q: Fish pole carbon cloth tcf. Vcf. Svf. Hcf. On behalf of what?: Carbon cloth classification, a semicolon after the term, usually called HVF and SVF, where SVF is divided into VCF and so on! The index of carbon fiber is T (ton), common carbon part is 20T-30T commonly. HVF is 30T-40T, SVF is 40T-60T. SVF lighter than HVF, higher strength, better elasticity of the material of products: Di 46T SVF meaning 60T ultra high strength and high modulus carbon fiber cloth, HVF carbon fiber reinforced 30T 40T strength and high modulus. But the domestic ordinary carbon fishing rod material is generally 24T carbon fiber cloth. The higher the T value, the higher the strength and elasticity of the material.

Q: What is the typical composition of a steel billet?: The specific grade and intended use of a steel billet can cause its typical composition to vary. Nevertheless, in general, a steel billet primarily consists of iron, carbon, and additional alloying elements. Steel's main constituent is iron, which typically accounts for about 98% of its composition. This element provides the material with structural strength and durability. Carbon, the second most significant element, usually ranges from 0.02% to 2.1% and plays a vital role in determining the steel's hardness and strength. Besides iron and carbon, steel billets often incorporate various alloying elements to enhance specific properties. These elements may include manganese, silicon, nickel, chromium, molybdenum, vanadium, and others. Each element contributes to different characteristics, such as corrosion resistance, heat resistance, toughness, or machinability. Moreover, steel billets are frequently produced through processes like continuous casting or hot rolling, which can introduce small amounts of impurities. These impurities, such as sulfur, phosphorus, and oxygen, are typically maintained at very low levels to preserve the desired quality of the steel. In conclusion, the typical composition of a steel billet comprises a combination of iron, carbon, alloying elements, and minor impurities. These components are carefully regulated to achieve the desired mechanical properties and performance for a wide range of applications in industries such as construction, automotive, aerospace, and manufacturing.

Q: What are the main factors affecting the surface roughness of steel billets?: The main factors affecting the surface roughness of steel billets include the quality of the raw materials used, the manufacturing process, the condition of the equipment used, and the skill and expertise of the operators.

Q: How are steel billets made?: Steel billets are made through a process called casting. It starts with raw materials such as iron ore, coal, and limestone being melted in a blast furnace to produce molten iron. This molten iron is then further refined in a basic oxygen furnace or an electric arc furnace to adjust its composition and remove impurities. Once the desired composition is achieved, the molten iron is poured into a continuous casting machine. This machine consists of a water-cooled copper mold that shapes the molten iron into a solid billet. As the molten iron is poured into the mold, it rapidly cools and solidifies, forming a continuous length of solid steel. The billet is then cut to the desired length and transferred to a storage area to cool down further before further processing. The cooling process is crucial as it helps in improving the billet's internal structure and overall quality. After cooling, the steel billets can undergo various treatments such as heat treatment or surface conditioning to enhance their mechanical properties and surface finish. They can also be further processed into different shapes and sizes through rolling, forging, or extrusion to meet specific customer requirements. Overall, the production of steel billets involves melting the raw materials, refining the molten iron, casting it into a continuous mold, and subsequently cooling and processing the solid billets. This process ensures the production of high-quality steel billets that serve as crucial building blocks for various industries such as construction, automotive, and manufacturing.

Q: What are the different surface defects that can be found in steel billets?: There are several common surface defects that can be found in steel billets. These defects can occur during the manufacturing process or due to handling and transportation. Some of the different surface defects that can be found in steel billets include: 1. Scale: Scale is a type of surface oxidation that appears as a thin layer of iron oxide on the surface of the billet. It can occur during the heating and cooling process and can be removed through mechanical or chemical cleaning methods. 2. Cracks: Cracks can occur due to the improper cooling of the billet or excessive stress during handling. They can either be longitudinal or transverse, and their severity depends on the depth and length of the crack. Cracks can weaken the structural integrity of the billet and should be carefully inspected and repaired. 3. Inclusions: Inclusions are particles or impurities that are trapped within the steel during the manufacturing process. They can be non-metallic or metallic in nature and can affect the mechanical properties of the billet. Inclusions can be categorized as slag inclusions, gas porosity, or non-metallic inclusions like oxides and sulfides. 4. Decarburization: Decarburization is a surface defect that occurs due to the loss of carbon on the surface of the billet during the heating process. It can result in reduced hardness and strength of the steel in the affected area. Decarburization can be minimized by controlling the heating and cooling process and using protective atmospheres. 5. Laminations: Laminations are layers or sheets of non-metallic material that are trapped between the layers of steel during the manufacturing process. They can cause weak spots in the billet and can lead to failure under stress. Laminations can be detected through non-destructive testing methods and should be removed or repaired. 6. Pitting: Pitting is a localized corrosion phenomenon that appears as small pits or cavities on the surface of the billet. It can occur due to exposure to corrosive environments or improper storage conditions. Pitting can reduce the lifespan of the billet and should be treated to prevent further corrosion. It is important to note that these surface defects can vary in severity and impact the quality and performance of the steel billet. Regular inspection, testing, and quality control measures are necessary to identify and address these defects to ensure the integrity of the steel billet and the final products made from it.

Q: What are the different surface treatments for steel billets?: There are several different surface treatments that can be applied to steel billets to enhance their performance and protect them from corrosion. One common surface treatment is hot-dip galvanizing, where the steel billets are dipped into a bath of molten zinc. This creates a protective coating of zinc on the surface of the billets, which acts as a barrier against moisture and other corrosive elements. Another option is electroplating, where a thin layer of metal, such as chromium or nickel, is deposited onto the surface of the steel billets using an electric current. This not only provides corrosion resistance but can also improve the appearance of the billets. A third surface treatment method is painting or powder coating. This involves applying a layer of paint or dry powder onto the surface of the billets. The paint or powder forms a protective barrier that prevents moisture and other corrosive substances from reaching the steel. Additionally, shot blasting or sandblasting can be used as a surface treatment for steel billets. This involves propelling abrasive particles at high speeds onto the surface of the billets to remove any impurities or scale, leaving a clean and smooth finish. Lastly, there are also chemical treatments available for steel billets. One example is phosphating, where the steel is immersed in a phosphoric acid solution, resulting in the formation of a protective phosphate coating on the surface. This coating improves corrosion resistance and promotes paint adhesion. Overall, the choice of surface treatment for steel billets depends on the specific requirements of the application and the desired level of protection against corrosion and other environmental factors.

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