GB/T3087-2022 is the national standard for seamless steel pipes for low and medium-pressure boilers. For low and medium-pressure boiler steel pipes of the specification “133*5″, according to this standard, there is the following relevant information: Scope of application: GB/T3087-2022 standard applies to the manufacture of high-quality carbon structural steel seamless steel pipes for low and medium pressure boilers. If steel pipes of the specification “133*5″ are used in the field of low and medium-pressure boilers, they must meet the requirements of this standard. Seamless steel pipes for other pipelines can also refer to this standard.
First, technical requirements for 133*5 low and medium pressure boiler steel pipes:
1. Chemical composition: The chemical composition of steel should comply with relevant regulations. Generally speaking, the steel pipe material grades under this standard are mainly 10, 20, etc.
2. Mechanical properties: Mechanical properties including tensile strength, yield strength, elongation, and other indicators must meet the standard requirements to ensure that the steel pipe can withstand the corresponding loads and stresses during use.
3. Process performance: For example, there are corresponding requirements for process performance such as cold bending test, which is to ensure the reliability of steel pipes during processing and use.
Second, the size, shape, and allowable deviation of 133*5 low and medium-pressure boiler steel pipes:
1. Size: “133″ means that the outer diameter of the steel pipe is 133 mm, and “5″ means that the wall thickness of the steel pipe is 5 mm. The standard has clear regulations and allowable deviations for the outer diameter, wall thickness, and other dimensions of the steel pipe.
2. Appearance: The shape of the steel pipe should be regular, and there should be no obvious defects such as bending, twisting, deformation, etc., to ensure the installation and use of the steel pipe.
3. Inspection rules: The standard stipulates the inspection rules for steel pipes, including factory inspection, type inspection, etc. Inspection items include chemical composition analysis, mechanical properties testing, size and shape inspection, surface quality inspection, etc., to ensure that the quality of the steel pipe meets the standard requirements.
Packaging, marking, and quality certificate: The packaging of the steel pipe should be able to protect the steel pipe from damage during transportation and storage. The marking should clearly and accurately indicate the specifications, materials, manufacturers, and other information of the steel pipe. The quality certificate should contain the chemical composition, mechanical properties, inspection results, and other contents of the steel pipe.
Post time: May-27-2025