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Q345C seamless steel pipe is an important engineering material, it is widely used in various fields such as petroleum, chemical industry, electricity, construction, etc., so its quality is crucial to the safety and reliability of the project. The quality control of Q345C seamless steel pipe is a systematic project involving multiple links and factors. The following will discuss the quality control of raw materials, production process optimization, quality testing, and inspection.
Industrial performance of Q345C seamless steel pipe
1. Implementation standards of Q345C seamless steel pipe: GB/T8162 seamless steel pipe for structure, GB/T8163 seamless steel pipe for conveying fluid. In addition to GB/T8162 seamless steel pipe for structure, GB/T8163 should meet the requirements of pressure pipeline type test rules.
2. Chemical composition of Q345C seamless steel pipe: carbon: 0.12~0.18, silicon 0.20~0.50, manganese: 1.2~1.7, chromium: ≤0.30, vanadium: ≤0.15, niobium: ≤0.07, nickel: ≤0.50, phosphorus: not more than 0.025, sulfur not more than 0.015.
3. Mechanical properties of Q345C seamless steel pipe: tensile strength 490~670MPa, yield strength: wall thickness less than or equal to 16mm not less than 345MPa, wall thickness 16mm~40mm not less than 335MPa, wall thickness greater than 40mm not less than 352MPa, elongation after fracture: longitudinal not less than 21, transverse not less than 19, low temperature 0℃: longitudinal not less than 40, transverse not less than 27. Heat treatment system: 880℃~940℃ normalizing.
4. Production process of Q345C seamless steel pipe: cold drawing, hot rolling, hot expansion.
5. Delivery status of Q345C seamless steel pipe: hot rolling, heat treatment.
6. The product outer diameter of the Q345C seamless steel pipe is 21.3mm~762mm and the wall thickness is 3mm~140mm. The usual length of the Q345C seamless steel pipe is 4000 mm~12000 mm. After negotiation between the supply and demand parties and indicated in the contract, steel pipes with a length greater than 12000mm can be delivered; steel pipes with a length shorter than 4000mm but not shorter than 3000mm can also be delivered, and the quantity should not exceed 5% of the total quantity of steel pipes delivered in this batch.
First, raw material quality control of Q345C seamless steel pipe
The quality of raw materials directly determines the quality of Q345C seamless steel pipe, so the quality control of raw materials is the basic link in the entire quality control process. First of all, we should select high-quality raw material suppliers, and strictly test and control the chemical composition, mechanical properties, and other aspects of the raw materials to ensure that the quality of the raw materials meets the standard requirements. At the same time, during the storage and transportation of raw materials, effective measures should be taken to prevent the materials from being corroded, damaged, or mixed with impurities, etc., which affect the quality.
Second, the production process optimization of Q345C seamless steel pipe
The production process is one of the key factors that determine the quality of the Q345C seamless steel pipe. In the production process, advanced process technology and equipment should be used to improve production efficiency and product quality. At the same time, the process parameters such as temperature, pressure, and time in the production process should be strictly controlled to ensure that the produced steel pipe has good dimensional accuracy, surface quality, and mechanical properties. In addition, new production processes and technologies should be actively explored to continuously improve product quality and production efficiency.
Third, quality inspection and testing of Q345C seamless steel pipe
Quality inspection and testing is the last line of defense to ensure the quality of the Q345C seamless steel pipe. In the production process, each process should be strictly inspected and recorded to detect and solve quality problems in a timely manner. At the same time, before the finished product leaves the factory, the steel pipe should be subjected to a comprehensive quality inspection, including dimensional accuracy, surface quality, mechanical properties, and other aspects of the inspection, to ensure that the steel pipe leaving the factory meets the standard requirements. In addition, the production equipment and processes should be evaluated and improved regularly to continuously improve the quality of products and the stability of production.
In summary, the quality control of Q345C seamless steel pipe is a systematic project, which requires comprehensive control and management from the aspects of raw material quality control, production process optimization, quality testing, and inspection. Only by continuously improving the quality of products and the stability of production can we meet the needs of the market and the requirements of customers and win the trust and reputation of the market.
Threeway Steel is known as a professional supplier engaged in manufacturing and distributing a wide range of steel pipe, and our headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
