| Customization: | Available |
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| After-sales Service: | Supplied |
| Warranty: | 30 Years |
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| Material Grade: | S31803 | Standard: | ASTM A790 |
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| NDT: | ET, UT, HT , PT | Size: | 1/2"~48" |
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super duplex seamless pipe,welded steel pipe |
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Duplex Steel Seamless Pipe ASTM A790 S31803 Chemical plant Application
What is S31803 Duplex pipe?
S31803 is a high-strength and corrosion-resistant alloy steel composed of iron, chromium, nickel and some other alloying elements. Due to its duplex structure, S31803 has excellent mechanical properties and corrosion resistance, making it an ideal material for a wide range of applications in petroleum, chemical, many marine equipment and other fields. At the same time, S31803 stainless steel also has high stress corrosion resistance, can be used in some special environmental applications.
Technical Content Knowledge Introduction.
1. Chemical composition: S31803 is composed of iron, chromium, nickel, manganese, silicon and some other alloying elements. The higher content of chromium has the effect of increasing the corrosion resistance of the material; the content of nickel increases the strength and toughness of the material.
2. Structural characteristics: the structure of S31803 consists of two phases, austenite and ferrite, in the appropriate cold or high-temperature annealing treatment, you can obtain the appropriate organization and properties. Its structural characteristics determine the S31803 has excellent properties such as corrosion resistance and stress corrosion resistance.
3. Physical properties: S31803 has high strength and hardness, and its properties can be adjusted through precise control of cold treatment and heat treatment processes. At the same time, S31803 also has good plasticity and toughness, which makes it a kind of stainless steel material with good machinability.
4. Corrosion resistance: S31803 has good corrosion resistance, can resist the erosion of a variety of acids, alkalis and salts and other corrosive media at a certain temperature and concentration conditions. At the same time, S31803 resistance to stress corrosion cracking is significantly better than ordinary austenitic stainless steel.
Analysis of production smelting process of S31803
1. Raw material preparation: the first task in the production of S31803 is to prepare suitable raw materials, including iron, chromium, nickel and other alloying elements. The quality of raw materials directly affects the performance of the final product.
2. Smelting process: The smelting process of S31803 usually adopts electric arc furnace smelting and vacuum treatment technology to ensure that the impurities and non-metallic substances in the raw materials can be effectively removed, and meanwhile, the temperature and atmosphere in the smelting process are well controlled.
3. Refining treatment: In the smelting process, refining treatment is also needed to further improve the quality and performance of S31803. Common refining treatment includes vacuum degassing, argon gas blowing, etc. 4.
4. Overheat treatment: After completing the refining treatment, it is necessary to carry out overheat treatment to adjust the organization and properties of S31803. Overheat treatment can be realized by controlling the heating temperature and holding time.
In summary, S31803 has excellent performance and a wide range of applications. For people who know S31803, it is very important to master its comprehensive information introduction, detailed technical content knowledge introduction and production and smelting process analysis. Such knowledge will help to understand and apply S31803, and further promote its development and application in the industrial field.
Chemical Composition of ASTM A790 S31803
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 2205 (UNS S31803) | Min Max | - 0.030 | - 2.00 | - 1.00 | - 0.030 | - 0.020 | 21.0 - 23.0 | 2.5 - 3.5 | 4.5 - 6.5 | 0.08 - 0.20 |
Physical Properties OASTM A790 S31803
| Grade | Density (kg/m3) |
Elastic Modulus(GPa) |
Mean Co-eff of Thermal Expansion (μm/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat 0-100°C( J/kg.K) |
Electrical Resistivity (nΩ.m) |
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| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| UNS S31803 / 2205 | 782 | 190 | 13.7 | 14.2 | - | 19 | - | 418 | 850 |
Duplex Stainless Steel Pipe Application:
Chemical processing, Transport and Storage.
Oil and gas exploration and offshore rigs.
Oil and gas refining.
Marine environments.
Pollution control equipment.
Pulp and paper manufacturing
Chemical process Plant
Some of the quality tests carried out by us includes:
| Corrosion Test | Conducted only when specially requested by the client |
| Chemical Analysis | Test done as per required quality standards |
| Destructive / Mechanical Testing | Tensile | Hardness | Flattening | Flare | Flange |
| Reverse-bend and Re. flat tests | Carried out in full compliance with relevant standards & ASTM A-450 and A-530 norms, which ensures trouble-free expansion, welding & use at customers end |
| Eddy Current Testing | Done to detect homogeneities in subsurface by using Digital Flaw-mark Testing System |
| Hydrostatic Testing | 100% Hydrostatic Testing carried out according to ASTM-A 450 norms for checking tube leakage, and biggest pressure we can support 20Mpa/7s . |
| Air Under Pressure Test | To check any evidence of air leakage |
| Visual Inspection | After passivation, every single length of tubes & pipes is subjected to thorough visual inspection by trained staff for detecting surface flaws & other imperfections |
Supplementary Testing : Apart from the above mentioned tests, we also carry out on the manufactured products supplementary testing. The tests conducted under this include:
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