Green environmental protection under the theme of stainless steel pump valve shine general valve carbon steel forging technical conditions
Stainless steel pump with corrosion resistance, lightweight, long service life and other excellent characteristics.
In recent years, stainless steel pump in shipbuilding, rail vehicles and other transportation industry has been widely used, with the development of machinery manufacturing industry, stainless steel pump will have a broader application prospect.
Throughout the 2013 hardware stainless steel pump market situation, experts found that the market of stainless steel pump whether in product quality or market share has been greatly improved, forecast in 2023 will reach 3 billion yuan, which is exciting news for the enterprise and the country.
With the rapid increase of the market, the stainless steel pipeline pump industry is faced with new technical innovation.
Each enterprise is also competing to launch their own mace, constantly improve their research and development team, research related to the latest production technology, in order to improve the competitiveness of enterprises in the market.
In recent years, the technical level of Chinese pump products has improved greatly. Through the introduction, renovation, digestion and innovation, the new generation of Chinese pump products has reached the level of the late 80′s and early 90′s of the international market, especially the matching products of certain important technology equipment have reached or approached the advanced level of similar international products.
With the unceasing development of our country, the unceasing improvement of national income.
Products made of stainless steel materials because of their long service life, not easy to rust, green environmental protection and other advantages have slowly entered the industrial application, stainless steel pipeline pump is one of the best.
Especially in recent years for the food industry countries put forward higher requirements, stainless steel materials because of safety and health, gradually onto the stage of history, for mandatory requirements, stainless steel submersible pump as the first stainless steel pump products began to shine in food products.
It is not difficult to see that the use of stainless steel pipeline pump pump products are leading the pump industry continues to move forward, and this driven by the raw material market, the emergence of new stainless steel materials.
Stainless steel itself because of its corrosion resistance, high temperature resistance, wear resistance and other characteristics, in our country the key development of energy, petrochemical, electric power, mining and other fields will play its role more actively.
Today, stainless steel pump involved in the field of increasing, which in the water industry, building and structure industry, environmental protection industry, industrial facilities in the demand will also rise year by year.
From the consumption situation, at present, China’s apparent consumption has reached a high level in the world close to 1/4 of the global total consumption, per capita stainless steel consumption reached 3.4KG, jumping to the forefront of developing countries.
However, the growth rate of consumption gradually slowed down, from the ultra-fast development stage with an average annual growth rate of more than 30% to the current steady development stage with a growth rate of 6.43%.
In the water industry, water pollution in the process of storage and transportation has been paid more and more attention.
A lot of practice has proved that stainless steel is water preparation, storage, transportation, purification, regeneration, desalination and other water industry is the best material.
Its advantages are: corrosion resistance, earthquake resistance, water saving, sanitation (no rust and copper green), light weight (reduced by 1/3), easy maintenance, long life (can be used for 40 years), low life cycle cost (LCC), is a recyclable green material.
According to reports, at present, Japan Tokyo area pipeline stainless steel has reached 76%, pipe leakage rate from the original 14.7% reduced to the current 7.5%.
Stainless steel water storage tanks remain intact after a massive earthquake hit Osaka, Japan.
Recently, Japan developed the bellows joint, which reduced the construction cost of stainless steel pipeline by 20%, the total cost by 3%, and the maintenance cost by 3/4.
Stainless steel industry driven by the stainless steel pump, has a good market development prospects, not only civil stainless steel pump, or industrial field demand of stainless steel industrial pump.
By adding green stainless steel materials, stainless steel pump can become the vanguard in the pump industry and contribute to the development of stainless steel pump industry.
Technical conditions for carbon steel forgings of general valve (two) Each furnace heat treatment forgings should be a tensile test, if the same furnace heat treatment forgings include more than two rolling furnace numbers, each rolling furnace number should be tensile test. If the forgings are too small, it is impossible to make small test blocks for tensile test on the forgings or to take all the test blocks parallel to the main deformation direction, and it is impossible to set up a set of upper forging test blocks, then 1% of the batch or 10 pieces (take a small value) can be extracted for hardness test. The pressure test shall be carried out after the NDT and shall be carried out piece by piece. The forging unit shall be responsible for the quality of the test forgings.
Connection: general valve carbon steel forgings technical conditions (I)
Method of test
Tensile test
Each heat treatment forgings shall be subjected to a tensile test. If the forgings with the same heat treatment include more than two rolling furnace numbers, each rolling furnace number shall be subjected to a tensile test.
Under the condition of intersample heat treatment, the temperature error is within 14℃ of soil, and there are high and high recording devices, the rolling furnace number is unified, and only one tensile test is needed.
The tensile test method shall be carried out according to the provisions of GB/T 228.
If the forgings are too small, it is impossible to make small test blocks for tensile test on the forgings or to take all the test blocks parallel to the main deformation direction, and it is impossible to set up a set of upper forging test blocks, then 1% of the batch or 10 pieces (take the minimum value) can be extracted for hardness test.
Hardness test
Forgings hardness test method according to GB/T 231.1.
Impact test
Forgings impact test method according to GB/T 229.
Non destructive testing
The ultrasonic testing and magnetic particle testing methods of forgings shall be carried out in accordance with the provisions of GB/T4730.
Pressure test
The pressure test method of pressure forgings shall be carried out according to GB/T 13927.
Pressure forgings should be tested after machining to ensure that there is no leakage.
Rule of inspection
The inspection items and number of forgings for each grade are specified in Table 5.
Table 5 Forging inspection items
If the mechanical properties test results do not conform to the provisions of Table 4, the heat treatment shall be re-treated according to the provisions of 3. 3, and the sample block shall be made according to the provisions of 3.5, and the test shall be conducted according to the provisions of 5.1. However, the number of re-heat treatment shall not exceed two times.
The pressure test shall be carried out after the NDT and shall be carried out piece by piece. The forging unit shall be responsible for the quality of the test forgings.
Order requirement
The order table or inquiry list shall include the following contents:
a} product forging drawing, which has the table and roughness, tolerance, material grade number and other requirements;
b) Supplier’s forging process and forging drawing (approved by Demander if necessary);
c) Heat treatment and other requirements can be negotiated by both parties.
d) Acceptance requirements and contents to be supplemented.
The Demander shall notify the forging unit within the time stipulated in the contract if it finds waste in the process of product analysis or machining. If there is no provision, it shall not exceed 30 days.
The forgings that are proposed to be scrapped shall be kept for 30 days from the date of sending the test report, during which the forging unit may request reexamination.
Mark and quality certificate
After the forgings pass the inspection, the qualification mark should be attached. The content of the mark includes:
a) Factory brochure or factory label,
b) Material code;
C} heat treatment code;
d) Manufacturing mouth period;
e) Inspector mark.
For forgings with small weight and difficult marks, marks can be used instead, but the marks should be located in a position that does not affect the use of forgings.
The forgings shall be delivered with a quality guarantee certifying that the quality of the forgings meets the requirements of this standard.
Post time: Nov-17-2022
