ASTM A240 321 Stainless Steel 2:1 Ellipsoidal Head / Dish End For Pressure Vessel
Ellipsoidal head is also called elliptical head or elliptical dish end. The shape of this ellipsoidal head is more economical, because the height of the head is just a fraction of the diameter. The elliptical dish end radius varies between the major and minor axis usually with the ratio is 2:1. The elliptical tank head is the economical solution for medium pressure tanks due to the reduced metal thickness requirement.
ASTM A240 / ASME SA240 Standard Specifification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
| Material | ASTM A240 SS321 (UNS S32100) |
| Dimension | According to your drawings, or we supply the draws |
| Application | Oil and water tank cover and head |
| Inspection | Chemical composition; UT , MT; mechanical property; dimension check |
| Technology | 1.Cold & hot forming;
2. Hot pressed hemispheres and cold formed segmental hemispheres; |
| Connection | Welding |
| Standard | ASTM, ASME, DIN, JIS, ISO, BS, API, EN |
| QC Doc. | Chemical composition report; mechanical properties report; UT test report; heat treatment report; dimensions check report. |
| Forging processing | Ingot---forging---heat treatment---rough machining---UT.MT---Q+T---inspection---finishing machining---UT.MT---Packing |
| Heat treatment | Normalized / Annealed / Quenched / Tempered |
Elliptical Heads Details
D0 = Outer diameter
Di = Inner diameter
SF = Stepped-edge height
DH = Dish height
THi = Total height innen
KR = Dish radius
CR = Wall thickness
Stainless Steel 321 Equivalent Grades
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS |
| BS | En | No | Name |
| 321 | S32100 | 321S31 | 58B, 58C | 1.4541 | X6CrNiTi18-10 | 2337 | SUS 321 |
Stainless Steel 321 Chemical Compositions
| Grade | | C | Mn | Si | P | S | Cr | Mo | Ni | N | Other |
| 321 | min.
max | -
0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0
19.0 | - | 9.0
12.0 | 0.10 | Ti×5(C+N)
0.70 |
Stainless Steel 321 Mechanical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50 mm) min | Hardness |
| Rockwell B (HR B) max | Brinell (HB) max |
| 321 | 515 | 205 | 40 | 95 | 217 |
Stainless Steel 321 Physical Properties
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100 °C (J/kg.K) | Electrical Resistivity (nΩ.m) |
| 0-100 °C | 0-315 °C | 0-538 °C | at 100 °C | at 500 °C |
| 321 | 8027 | 193 | 16.6 | 17.2 | 18.6 | 16.1 | 22.2 | 500 | 720 |
Production Procedure
Materials purchased - Physical and chemical tests - Production - Hot forging and forming - Heat treatment - Inspection - Fine finishing - Finished product inspection - Marking - Finished product inspection - Marking - Packing and typing - Shipping.
Applications
Petroleum, electronics, chemicals, pharmaceuticals, light textiles, food, machinery, construction, nuclear power, aerospace, military industry
Pressure vessel Dished heads, Boilers Ends caps, ellipsoidal dished end, Heat exchanger Elliptical head, Crown radius of Ellipsoidal head
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ASTM A240 321 Stainless Steel 2:1 Ellipsoidal Head / Dish End For Pressure Vessel Images
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