SA240-304 304L Dish Elliptical Head Elliptical Dished Head End Cap
We are a professional manufacturer of SA240-304 304L Dish Elliptical Head Elliptical Dished Head End Cap in China.
What is a Elliptical Head?
An elliptical head, also known as a 2:1 elliptical head or ellipsoidal head, is a common type of pressure vessel head characterized by its elliptical or football-like shape, offering strong structural integrity and smooth stress transitions.
The 2:1 ratio means the major axis (diameter) is twice the minor axis (depth), making them stronger and more efficient compared to other head types.
Elliptical tank head is fabricated to have a certain shape instead of a particular dish radius or knuckle radius. The dish radius is approximately 90% of the diameter and the knuckle radius is approximately 17% of the diameter. 2:1 elliptical flanged and dished heads are ASME compliant.
SA240-304 304L Elliptical Head
SA240 304 Stainless steel is the most common stainless steel material in Hot rolled or Cold rolled typies.SA240 304L stainless steel plate is very similar with SA240 304 stainless steel plate,but contains less Carbon (Max.0.03%) in chemical composition.So SA240 304L stainless steel plate minimum the risk of chrome carbide precipitation and corrosion around the welding.
| SA240 304 SA240 304L | Chemical composition: Heat Analysis Max% | |||||||||
| Standard | Grade | C | Mn | P | S | Si | Cr | Ni | N | |
| ASME SA240/240M | 304 | 0.07 | 2.00 | 0.045 | 0.030 | 0.75 | 17.5-19.5 | 8.0-10.5 | 0.10 | |
| ASME SA240/240M | 304L | 0.03 | 2.00 | 0.045 | 0.030 | 0.75 | 17.5-19.5 | 8.0-12.0 | 0.10 | |
| Mechanical Properties: | UNS Designation | Yield strength | Tensile strength | Hardness max. | ||||||
| Mpa Min. | Mpa | Brinell HBW | ||||||||
| ASME SA240/240M | 304 | UNS S30400 | 205 | 515 | 201 | |||||
| ASME SA240/240M | 304L | UNS S30403 | 170 | 485 | 201 | |||||
din-28013-elliptical-heads
This standard specifies dimensions and technical delivery conditions for one-piece ellipsoidal dished ends (‘ends’, for short). It applies to ellipsoidal dished ends with or without weld that have an outside diameter, da, of up to 4000 mm and a wall thickness, s, of up to 50 mm. It covers ends of dimensions satisfying the following conditions:
r1 = 0.8 da
r2 = 0.154 da
h1 ≥ 3 s’)
h2 = 0.255 da – 0.635 s
Materials for Elliptical Heads
Carbon Steel – ASTM A516 Gr. 70, SA 516 Gr. 70
Stainless Steel – ASTM A240 304, 316, 321, 904L
Nickel Alloys – Inconel 625, Inconel 718, Hastelloy C22
Duplex & Super Duplex Stainless Steel – UNS S31803,UNS S32750 SAF 2205, 2507
Aluminum, Titanium & Other Special Alloys
Standards Compliance:
Meets DIN 28013, EN, ASTM, and ASME specifications for pressure vessel components.
Applications of Elliptical Heads
Pressure Vessels & Boilers – Used in high-pressure industrial applications.
Heat Exchangers & Reactors – Provides durability and efficiency.
Storage Tanks & Gas Cylinders – Ideal for liquid and gas containment.
Petrochemical & Oil & Gas Industry – Suitable for extreme environments.
