Head profile · CHA

Conical heads, bottoms and transitions (CHA)

Conical profiles to your apex angle, knuckle radius and straight flange, with or without a flanged edge for welding.

Profile and application

A conical head is defined by the drawing rather than a single fixed profile. The apex angle, large and small diameters, knuckle radius, straight flange and edge preparation all affect the forming route. We review those details together before quoting.

Outside diameter: Ø300–1500 mm
Wall thickness: 2–16 mm
Reference form: GB/T 25198 · customer drawing
Typical use: Hoppers, conical bottoms, separators and silos

Conical heads can be supplied as a standalone bottom or as a transition between two cylinder diameters. Where a knuckle is specified, include its radius and the tangent points. Where the cone is segmented, the number and orientation of seams must be agreed before manufacturing.

CHA cross-section. Final height, straight flange and edge form follow the approved drawing.

Specification at a glance

Code	Profile	Reference form	Outside diameter	Wall thickness	Typical use
CHA	Conical head or transition (CHA)	GB/T 25198 · customer drawing	Ø300–1500 mm	2–16 mm	Hoppers, conical bottoms, separators and silos

The published diameter is the equipment range, not a record that every size has already run. A new diameter or profile starts with a tooling check and, where required, a dimensioned first article for approval. See the full head-type comparison.

Common applications

Hoppers and silos

Conical discharge sections for bulk solids and process equipment.

Separators

Transitions and bottoms in separation, settling and collection vessels.

Process vessels

Conical ends where drainage or a controlled transition is required.

Materials and finishes

Family	Grades	Typical use
Carbon steel	Q235B, Q345B, SA-36, SA-414G (Q345R on request)	Storage tanks, receivers, general fabrication
Stainless steel	201, 304/2B, 304/BA, 30408 (304L and 316L on request)	Solar and hot-water cylinders, food, pharma, chemical
Aluminium	5083-O and other 5xxx grades	LNG vehicle cylinders, Dewar flasks, cryogenic service
Finishes	2B, BA, pickled, polished — necking zone Ra ≤ 0.4 µm	Where appearance or cleanliness matters

Grades outside the listed families can be reviewed on request. The material certificate supplied with the batch is tied to the heat number.

What to send for a quotation

Finished drawing, size list or sample photograph
Outside diameter, overall height and straight flange
Material grade and required surface finish
Openings, necks, bosses or lifting features with positions
Quantity, inspection requirement and delivery port

If some dimensions are still open, send the application and current sketch. We will list what has to be fixed before a price or tooling decision can be made.

Documentation and inspection

Dimensional report with the agreed measured features
Material certificate tied to the heat number
Radiographic, ultrasonic or magnetic particle testing on request
Third-party inspection welcomed for the agreed scope

Send the RFQ

Questions buyers ask first

What dimensions define a conical head?

Provide the apex angle or half-angle, large and small diameters, height, knuckle radius, straight flange length and edge preparation. The drawing should also show any seam orientation or opening locations.

Can you make a cone between two different diameters?

Yes. A conical transition can connect two cylinder sizes to drawing. Confirm both diameters, the overall height, the included angle and whether the ends are straight flanges, butt-weld edges or another joint form.

Is a conical section always one piece?

Not necessarily. The forming route depends on size, thickness and geometry. If a seam is required, its location and orientation will be agreed on the approved drawing before the part is made.

Can openings be included?

Yes. Nozzles, bosses, sight ports and other openings can be positioned to drawing. Send the opening schedule with the cone drawing so the forming and welding sequence can be included in the quotation.

Compare other head profiles

2:1 elliptical head (EHA)

The standard vessel profile with crown height D/4. Pressed in carbon steel, stainless steel and aluminium.

Torispherical dished head (THA)

Crown and knuckle radii to your drawing, from thin stainless end caps to heavier low-pressure tank heads.

Hemispherical head (HHA)

Half-sphere profile with crown height D/2 for high-pressure, LNG and cryogenic equipment.

Flat head or tank bottom (FHA)

Flat plates with a formed straight flange for welding, including openings and edge preparation to drawing.

Request a quote

Send the cone drawing with both diameters, apex angle, knuckle radius and edge details.

Open the RFQ form [email protected]

Quotes usually go out within one working day. Drawings stay confidential.