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What is the processing allowance of seamless steel pipes

Date:2024-05-13View:49Tags:EN10219-1,rural water,Steel Pipe Flange

In order to understand how many millimeters are usually left to process seamless steel pipes, we must first understand the size tolerance range of the product itself. The size tolerance of a product refers to the allowable range of variation in the actual size of the product. (Explanation: Due to factors such as equipment, environment, technology, materials, etc., we are unable to generate consistent product dimensions. The size of any product is a relative value, not an absolute value. It is an allowable and controllable range of size values.) The purpose of tolerance setting is to ensure that changes in product dimensions are within this range, in order to meet the requirements of exchange or coordination between products.

Seamless steel pipes have very different dimensional tolerances and are used for different purposes, different production methods, and different production equipment. The professional level of technical personnel also directly affects product tolerances. Similarly, we would like to remind you that when retaining processing allowances, you should fully understand the production performance of the product and ensure its dimensional tolerance range. Analyze specific issues in detail to determine how to handle allowances. Based on our own experience, let's briefly discuss the reserved dimensions for seamless steel pipe treatment between different production methods.


For precise seamless steel pipes, it can be ensured that the general tolerances for inner diameter and outer diameter are plus or minus 0.1mm, and special tolerances can be plus or minus 0.025mm. It is recommended to retain a machining allowance of 0.2mm or more for grinding treatment. You can retain the processing allowance yourself based on the actual tolerance data after communicating and coordinating with the manufacturer.


2. Seamless steel pipes for ordinary hot coils. The national standard GB/T 8162-2018 produced by our factory is mainly used in the fields of mechanical structure and part processing. The outer diameter has upper tolerance and the inner diameter has lower tolerance. For example, a seamless steel pipe with an outer diameter of 133mm and an inner diameter of 83mm has an outer diameter of up to 133.5mm and an inner diameter of 82.5mm. Suggest a unilateral machining allowance of 0.7mm or more for rotational processing. The processing allowance for ordinary hot rolling seamless steel pipes is relatively large. This is because in the production process of ordinary hot-rolled seamless steel pipes, there is a tolerance between the outer diameter and inner diameter. The scope is extensive. In order to ensure that the processed steel pipes can meet the needs of mechanical structures and parts processing plants, a large amount of processing allowance is required to compensate for tolerances. You can retain the processing allowance yourself after communicating and coordinating with the factory based on the actual tolerance data.


3. It is recommended to fully communicate and coordinate with the manufacturer. Comprehensively consider various factors and analyze specific issues to determine the most suitable handling allowance. The retention of processing allowances for seamless steel pipes is a complex issue that requires consideration of many factors. To ensure the quality and accuracy of steel pipes, it is recommended to have complete communication and coordination with the manufacturer during the production process to determine the most suitable processing allowance. Based on actual tolerance data and production conditions, a reasonable processing allowance was selected to ensure that there will be no problems in the future processing.