Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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What is Head?
Head can also be called bearing end cap, is used to close the top of the apparatus four, so that the inside and outside of the quality isolation components. According to the different appearance of the surface layer, the head can be divided into convex, who-type, flat-plate computer type and combination type.
Plate computer type and combination type, in which convex head can be divided into hemispherical type, Oval type, disk type and so on. Heads include the main types currently on the market and are used in aerospace, national defense, petrochemical and chemical industries.
Benefits of Stainless Steel Ellipsoidal Heads:
Strength and Durability: Stainless steel ellipsoidal heads offer high strength and durability, providing reliable end closures for pressure vessels and tanks.
Uniform Stress Distribution: The ellipsoidal shape of the heads helps in distributing stress more uniformly compared to other head shapes, reducing the risk of localized stress concentrations.
Reduced Thickness Requirements: Ellipsoidal heads require less material thickness compared to other head shapes while maintaining structural integrity, helping to reduce weight and material costs.
Aesthetic Appeal: Ellipsoidal heads have a smooth and elegant shape, which can enhance the overall appearance of the pressure vessel or tank.
Efficient Fluid Flow: The smooth curvature of ellipsoidal heads promotes efficient fluid flow within the vessel or tank, reducing turbulence and pressure drop.
Easy to Fabricate: Ellipsoidal heads are relatively easy to fabricate and weld, making them a cost-effective choice for many applications.
Common types of stainless steel heads used in pressure vessels, tanks, and other industrial equipment:
Description: Ellipsoidal heads are characterized by their elliptical shape, with a depth that is approximately half the diameter of the head.
Description: Torispherical heads have a dish radius that is typically 6% of the diameter of the head, followed by a knuckle radius. They have a flatter profile compared to ellipsoidal heads.
Description: Hemispherical heads have a half-sphere shape with a depth equal to the radius of the head.
Description: Spherical heads have a full sphere shape.
Description: Flat heads have a flat, or nearly flat, profile with minimal curvature.
Description: Conical heads have a conical shape, tapering to a point.
Chemical Composition of ASME SA240 SS321
| Type | Grade | ASTM A240 Chemical Composition | ||||||||
| ASTM(A240M) | Others(JIS) | C | Si | Mn | P | S | Ni | Cr | Others | |
| Austenitic Steels | ||||||||||
| 321 | SUS321 | ≤0.08 | ≤0.75 | ≤2.00 | ≤0.045 | ≤0.030 | 9.0-12.0 | 17.0-19.0 | N≤0.10 | |
Mechanical properties of ASME SA240 SS321
| Type | Mechanical Properties for Stainless Steel Plates, Stainless Steel Sheet | |||||||
| ASTM(A240M) | Others(JIS) | Tensile Properties | Hardness | |||||
| Yield Strength (Mpa) | Tensile Strength (Mpa) | Elongation (%) | HBW | HRBW | ||||
| Austenitic Steels | ||||||||
| 321 | SUS321 | ≥205 | ≥515 | ≥40 | ≤217 | ≤95 | ||
Physical Properties of ASME SA240 SS321
| 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 |
Equivalent of ASME SA240 321
| JIS G4304 | ASTM | UNS | KS | EN10095 | AS | CNS |
| SUS321 | 321 | S32100 | STS321 | 1.4541 | 321 | 321 |
Applications
