Details of the characteristics, production, and application of 06Cr18Ni11Nb stainless steel seamless pipe

06Cr18Ni11Nb stainless steel seamless pipe, as a high-performance metal material, plays a vital role in the modern industrial field. Its unique material properties and wide range of applications make it an indispensable and important material in many high-end manufacturing fields.

06Cr18Ni11Nb stainless steel seamless pipe Details of 06Cr18Ni11Nb stainless steel pipe

The products of 06Cr18Ni11Nb stainless steel seamless pipe shall comply with the requirements of TSG D7002 pressure piping component type test rules.

The outer diameter of the 06Cr18Ni11Nb stainless steel seamless pipe is 18mm~1620mm, and the wall thickness is 1.0mm~800mm.

The chemical composition of 06Cr18Ni11Nb stainless steel seamless pipe: carbon: ≤0.08, silicon: ≤1.00, manganese: ≤2.00, phosphorus: ≤0.035, sulfur: ≤0.030, chromium: 17.00~19.00, nickel: 9.00~12.00, niobium: ≥10*%C ≤1.00

Material characteristics of 06Cr18Ni11Nb stainless steel seamless pipe

06Cr18Ni11Nb stainless steel is a kind of austenitic stainless steel. Its chemical composition contains a high proportion of chromium (Cr) and nickel (Ni) elements, and a small amount of niobium (Nb) elements are added. This unique alloy ratio gives 06Cr18Ni11Nb stainless steel excellent corrosion resistance, heat resistance, and good mechanical properties. Specifically, the high chromium content (17.00%~19.00%) enables it to maintain structural integrity in a variety of corrosive environments. Chromium can form a dense chromium oxide protective film on the surface of the steel, effectively preventing the intrusion of oxygen and other corrosive media, which is a key factor in the corrosion resistance of stainless steel. The nickel content is 9.00%~12.00%. Nickel can stabilize the austenite structure, improve the toughness, ductility, and corrosion resistance of steel, and enable the steel to maintain good performance in low temperature environments. In addition, the addition of nickel significantly improves the toughness and high temperature oxidation resistance of the material. The addition of niobium (≥10*%C ≤1.00%) effectively inhibits the precipitation of carbides and further enhances the material's resistance to intergranular corrosion. Niobium combines with carbon to form carbides, preventing the precipitation of chromium carbides at the grain boundaries, thereby improving the steel's resistance to intergranular corrosion. Silicon (Si) content ≤1.00%, manganese (Mn) content ≤2.00%, mainly used for deoxidation and proper improvement of steel strength. Carbon (C) content ≤0.08%, low carbon content helps improve the corrosion resistance and welding performance of steel.

The production process of 06Cr18Ni11Nb seamless stainless steel pipe

The production process of 06Cr18Ni11Nb seamless steel pipe involves multiple complex links, mainly including raw material preparation, smelting and pouring, hot rolling or cold drawing, heat treatment, and surface treatment.

In terms of raw materials, high-quality scrap steel, alloy elements, and recycled materials must be selected to ensure the stability and purity of the chemical composition. During the smelting process, the uniformity and quality of the molten steel are ensured by precisely controlling the furnace temperature and chemical composition. In the hot rolling or cold drawing forming stage, appropriate process parameters are selected according to the product specification requirements to obtain ideal dimensional accuracy and surface quality.

The heat treatment process includes solution treatment and stabilization treatment. Solution treatment is usually heated in the temperature range of 1000~1100℃, and then rapidly cooled (generally by water cooling). The purpose is to fully dissolve the alloy elements in the austenite structure, eliminate cold work hardening, and improve the corrosion resistance and toughness of the steel. The stabilization treatment temperature is around 850~930℃, and the time is generally 2~6 hours, followed by air cooling, mainly to prevent intergranular corrosion, by fully combining niobium elements with carbon to avoid the formation of chromium carbides at the grain boundaries.

Finally, through surface treatment processes such as pickling and passivation, the corrosion resistance and aesthetics of the steel pipe are further improved. During the production process, various tests and controls are also required for the pipes to ensure that their quality and performance meet the standard requirements.

Application fields of 06Cr18Ni11Nb seamless stainless steel pipe

Thanks to its excellent material properties, 06Cr18Ni11Nb seamless steel pipe is widely used in many high-end manufacturing fields.

- Petrochemical industry: As a pipeline material for conveying corrosive media (such as acid, alkali, salt, etc.), it effectively ensures production safety. It can resist the erosion of various corrosive media and ensure the long-term stable operation of equipment. It is also used in high-temperature and high-pressure pipelines in the oil refining process, as well as storage containers for some petrochemical products. It can resist the erosion of corrosive components in oil and its products while withstanding high temperature environments.

- Power industry: 06Cr18Ni11Nb steel pipes are often used to manufacture key components such as boilers and heat exchangers, and withstand high temperature and high pressure environments without deformation or leakage. For example, the superheater tubes and reheater tubes of the boiler, these tubes need to withstand the scouring of high-temperature steam and high pressure during the operation of the boiler. The high strength and heat resistance of 06Cr18Ni11Nb steel can ensure its normal operation.

- Food processing, medical equipment field: 06Cr18Ni11Nb steel pipe also shows an irreplaceable and important role. It is used in pharmaceutical and food processing equipment, such as fermentation tanks, cooking pots, storage tanks, and conveying systems.

In summary, 06Cr18Ni11Nb stainless steel seamless pipe has become an indispensable and important material for the modern industry with its unique material properties, wide application fields, significant performance advantages, and good market prospects. Facing the future, continuous technological innovation, the practice of environmental protection concepts and the precise grasp of market demand will be the key to promoting the high-quality development of the 06Cr18Ni11Nb steel pipe industry. We have reason to believe that in the near future, 06Cr18Ni11Nb steel pipe will shine in more fields and contribute more to the progress of human society.

S31040 stainless steel pipe, as a high-performance special steel, has demonstrated its unique value and broad application prospects in multiple industrial fields. S31040 stainless steel pipe S31040 stainless steel seamless pipe details

The common implementation standards of S31040 stainless steel seamless pipe are: Standard: ASTM A312, ASTM A790, ASMESA213, ASMESA249, ASMESA789,

The production methods of S31040 stainless steel seamless pipe are: cold-rolled seamless steel pipe, cold-drawn seamless steel pipe, heat treatment + rinse delivery.

The chemical composition of S31040 stainless steel seamless pipe%: Nickel: 19.00~22.00, chromium: 24.00~26.00, molybdenum: ≤0.75, silicon ≤1.00, manganese: ≤2.00, carbon: ≤0.08, sulfur: ≤0.030 Phosphorus: ≤0.045, Niobium: ≥10*C≤1.10

First, the basic characteristics of S31040 stainless steel

S31040 stainless steel is a kind of austenitic stainless steel. Its chemical composition contains 24%-26% chromium (Cr), about 19%-22% nickel (Ni), and a certain amount of molybdenum (Mo) and nitrogen (N). This unique alloy ratio gives S31040 stainless steel excellent corrosion resistance, high temperature strength, and good mechanical properties.

1. Corrosion resistance: The high chromium content makes S31040 stainless steel show excellent corrosion resistance in a variety of corrosive media, especially in oxidizing environments, such as oxygenated water and steam at high temperatures. In addition, the addition of molybdenum further improves its corrosion resistance in reducing media.

2. High temperature strength: S31040 stainless steel can still maintain high strength and toughness at high temperatures, which makes it an ideal material for high temperature environments. Its yield strength and tensile strength change little at high temperatures, ensuring the stability and reliability of the material.

Second, the manufacturing process of the S31040 seamless stainless steel pipe

The manufacturing process of S31040 seamless stainless steel pipe involves multiple links, including raw material preparation, smelting, hot rolling, cold rolling, heat treatment, testing, etc. Each step needs to be strictly controlled to ensure the quality of the final product.

1. Raw material preparation: Select high-quality S31040 stainless steel billets as raw materials to ensure the uniformity of chemical composition and microstructure.

2. Smelting and casting: Use advanced smelting technology, such as electric furnace smelting or vacuum induction melting, to remove impurities and improve the purity and uniformity of the alloy. The cooling rate needs to be controlled during casting to avoid cracks and defects.

3. Hot rolling and cold rolling: Hot rolling is rolling the billet heated to a high temperature through a rolling mill to form a preliminary tube shape. Cold rolling is carried out at a lower temperature, and the dimensional accuracy and surface quality of the steel pipe is improved through multiple rolling and stretching.

4. Heat treatment: S31040 seamless stainless steel pipes need to be subjected to solution treatment and stabilization treatment during the manufacturing process to improve their corrosion resistance and high temperature strength. Solution treatment is to heat the steel pipe to a certain temperature so that the alloy elements are fully dissolved in the matrix, and then quickly cooled; stabilization treatment is carried out after solution treatment. Through heating and heat preservation, the carbon element in the steel pipe is combined with the chromium element to form a stable carbide to prevent intergranular corrosion.

5. Testing and inspection: After manufacturing, the S31040 seamless stainless steel pipe needs to be strictly tested, including chemical composition analysis, mechanical property testing, non-destructive testing (such as ultrasonic testing, X-ray testing) and water pressure testing, etc., to ensure that it meets relevant standards and customer requirements.

Third, the application field of S31040 seamless stainless steel pipe

With its excellent performance, the S31040 seamless stainless steel pipe has been widely used in many fields.

1. Petrochemical: In the petrochemical industry, S31040 seamless stainless steel pipe is used to transport high temperature, high-pressure, and corrosive media, such as high temperature steam, sulfur-containing oils, and chemicals. Its corrosion resistance, high temperature strength, and good welding performance make it the preferred material in this field.

2. Power industry: In the power industry, S31040 seamless stainless steel pipe is used to manufacture key components such as superheaters, reheaters, and steam pipes of supercritical and ultra-supercritical boilers. Its excellent high temperature strength and anti-oxidation properties ensure the safe operation of the boiler.

3. Food processing: Due to its good hygienic properties and corrosion resistance, S31040 stainless steel is also widely used in the food processing industry. It is used to manufacture food processing equipment, conveying pipelines and storage containers, etc., to ensure the hygiene and safety of food.

4. Papermaking and printing and dyeing: In the papermaking printing and dyeing industries, S31040 seamless stainless steel pipe is used to transport high temperature and high-concentration corrosive media, such as cooking liquid, bleaching liquid, and dyeing liquid. Its excellent corrosion resistance ensures the long-term stable operation of the equipment.

5. Environmental protection and water treatment: In the environmental protection and water treatment industries, S31040 stainless steel seamless pipes are used to manufacture seawater desalination equipment, wastewater treatment equipment, desulfurization and denitrification equipment, etc. Its good corrosion resistance, high temperature strength, and weldability make it an important material in this field.

In summary, as a high-performance special steel, S31040 stainless steel seamless pipes have shown their unique value and broad application prospects in multiple industrial fields. With the continuous development of the global economy and the continuous advancement of industrial technology, its market demand will continue to grow and the market prospects are broad. Therefore, relevant practitioners should pay close attention to market dynamics and technological development trends, and continuously improve product quality and technical level to meet market demand and customer requirements.