Relevant production process of pressure vessel made of austenitic stainless steel as raw material
Pressure vessels and components made of austenitic stainless steel must comply with the corresponding process specifications during production. This ensures that the quality of the final product is high and stable. Let’s take a look at the specific contents of the specifications below.
First, it should be noted that mass production must be carried out according to the template, and the scribing should be carried out on a clean wooden board or platform. When the material is cut, austenitic stainless steel raw materials must be moved to a dedicated site for ion cutting or mechanical cutting. If the plasma cutting or open hole stainless steel plate is used, if it is to be welded after cutting, the oxide at the cut edge will be removed and the corresponding metallic luster will be fully revealed. When the mechanical cutting method is used, the machine tool must be cleaned before cutting, which can prevent the stainless steel plate from being scratched by foreign matter, and it is prohibited to directly cut the blank material on the stainless steel file.
There must be no cracks, indentations and tears on the edges and edges of stainless steel plates. Cut stainless steel materials should be neatly stacked on the bottom frame to facilitate lifting together with the bottom frame. Stainless steel plates must be filled with soft materials such as rubber and wood to prevent damage to the surface of the stainless steel plate.
If the raw material is stainless steel round bar or stainless steel pipe, you can use lathes, saw blades or grinders to cut the material. If you need to weld, you need to remove the grinding wheel debris and burrs.
When stainless steel rolling is performed, the surface of the rolling machine or the stainless steel surface is covered with a material containing no iron ions.
When machining such as drilling or turning, the coolant is usually a water-based emulsion.
Parts of stainless steel materials need to use liquid degreasers that do not contain chlorine to remove oil and other impurities before they can be hot processed or heat treated. The combustion gas in the furnace of the heating or heat treatment process must be neutral or slightly oxidizing. After hot working or heat treatment, the components on the metal surface cannot be removed. The sulphur content of the heating fuel oil is less than 0.3%. Coal fire coke heating is prohibited.
When the stainless steel head is thermoformed, it is necessary to strictly control the temperature and the starting temperature and the end temperature of the furnace in accordance with the relevant processing specifications and the requirements of the stamping process, and make appropriate records. It is not allowed to heat the furnace with the carbon steel head. The tools, laminations, etc. used for thermoforming should be cleaned and there must be no contamination such as steel shavings and scales.
After the hot-worked stainless steel head, elbow, metal and other components, as long as the requirements of anti-corrosion intergranular, in the hot processing according to the relevant regulations to do solid solution or stabilization treatment. The heat treatment process and the heat treatment time, ie, the temperature profile, are used after solidification or stabilization treatment. After the heat treatment, an intergranular corrosion test is also performed.
When the housing is assembled, temporary contact with the surface of the housing with the use of niobium, pad or the like and the selection of materials suitable for the stainless steel material.
Stainless steel pressure vessels should not be strongly assembled. Tools that could cause iron ion contamination should not be used in the assembly process. The opening of the container must also be plasma or mechanically cut.
Stainless steel pressure vessels in the welding process evaluation before welding and the first welding of steel, the first use of welding materials and welding methods, the need for standard assessment of the welding process.
Before austenitic stainless steel workpieces are pickled and passivated, they must do process tests and formulate suitable recipes and operating procedures. Samples should be sampled and tested regularly for pickling and passivation, and the concentration should be corrected in time.
The surface of the stainless steel plate after pickling can not have obvious etching liquid traces, can not have non-uniform color pattern, the weld and the hot processing surface can not have oxidation color, and after the pickling is completed, it should be rinsed with water. No residual acid solution. The surface of the passivated stainless steel plate is also rinsed with clean water and wiped dry.
After the austenitic stainless steel pressure vessel is manufactured, it is necessary to make a corresponding pressure test according to the provisions of the design drawings. After the sample acceptance, the entire production process can be completed.
Source: China Pressure Vessels Manufacturer – www.secmachinery.com
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