GB 8183-87 Seamless Nichrome Tubes
This standard (GB 8183-87) sets out the requirements for seamless nichrome tubes, which are made from nickel, chromium and iron alloys. The standard applies to tubes for general use with a maximum wall thickness of 6 mm and an outer diameter of up to and including 40 mm.
This standard covers a variety of properties and parameters for seamless nichrome tubes, including but not limited to mechanical properties, chemical composition, dimensional accuracy, surface quality, and mechanical tests. The tubes must meet a minimum tensile strength, yield strength, and hardness. The tubes must also conform to the chemical composition requirements given in the standard.
Mechanical testing of the nichrome tubes must be carried out according to the standard to ensure they meet the required specifications. This includes tensile strength tests, yield strength tests, hardness tests, and bend tests. The tubes must also be checked for surface defects and dimensions, and these must meet the requirements set out in the standard.
Chemical composition requirements should also be met. The alloy must be composed of at least 70% nickel, 14-16% chromium, and 4-7% iron. Other trace elements may also be present and any such material must meet the required limits. Additionally, the amount of oxygen and nitrogen present must also be limited to the specified amounts.
Finally, dimensional accuracy requirements must be met. The tolerances for outer diameter, wall thickness, and length must meet the requirements given in the standard. Additionally, surface finish requirements must be met in order to meet the standard.
Seamless nichrome tubes that meet the requirements of this standard are suitable for a wide range of applications. These include plumbing, heating and cooling, and electrical resistance applications. The tubes are also suitable for use in other industries where they can be used to construct frames and other structures.
In conclusion, seamless nichrome tubes must meet all the requirements of this standard (GB 8183-87) in order to be used for general purpose applications. The tubes must meet the requirements for chemical composition, mechanical, and dimensional properties as well as surface finish requirements. These tubes are versatile and can be used in a variety of industries for a variety of applications.
