Flanged and Dished Polished Heads

Flanged and Dished Polished Heads

Professional dished head producer in China. Quality and service are the first goal. More than 1000 tons dished heads were transported to clients since exploring export business in 2014 per year on average.
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Description
Technical Parameters

Introduction

 

 

The polishing grade of the flanged and dished polished heads supplied by Dalian Dingjin is an important indicator to measure its surface quality. Different applications have different requirements for the polishing grade. When choosing a polished dished heads, it is necessary to determine the appropriate polishing grade based on the specific application requirements and industry standards. At the same time, the correct polishing and maintenance methods are essential to maintain the surface quality of the end cap and extend its service life.

 

asme head

 

Parameter

 

 

Type

Hemispherical Head

Manufacture Standard

As per ASME Ⅷ-1,2023 UG79, &UG81

Inner Diameter

900mm

Min Thk. A/F

20mm

Straight Flange

50mm

Cutting Method

Plasma Cutting

Forming Method

Cold Forming

Heat Treatment

Not Required

Material Designation

316L

Material Standard

As per ASME II-A,2023

Surface Treatment

Polishing

NDT Method & Acceptance Creteria

Not Required

 

Polishing Method

 

 

Mechanical polishing:

The surface of the elliptical head is polished by mechanical force and abrasives to achieve a certain degree of smoothness. Mechanical polishing can be further divided into different levels such as rough polishing, semi-finishing polishing and fine polishing.

Electrolytic polishing:

The surface of the torispherical head is polished by electrochemical reaction to obtain a very smooth surface, which is suitable for occasions with high precision requirements.

Chemical polishing:

The surface of the hemispherical head is corroded by chemical reagents to make it smooth. Chemical polishing is suitable for heads with complex shapes.

 

conical head 5

 

Category

 

 

Polishing grades of flanged and dished head are usually divided according to surface roughness (Ra value). Common polishing grades include as below:

Grade

Description

Features

2B

Cold-rolled

bright surface

The surface is smooth and shiny, suitable for general use

No. 4

One-way

brushed surface

There are obvious brush marks, good corrosion resistance, suitable for occasions with high decorative requirements

No. 8

Mirror polished surface

The surface is very smooth and reflects light like a mirror, suitable for occasions with high cleanliness requirements

Ra value

Surface roughness

The smaller the value, the smoother the surface

 

Choosing the right polishing grade depends on the following factors:

Use environment:

Different use environments have different requirements for the corrosion resistance and cleanliness of the head.

Aesthetic requirements:

For some occasions with high decorative requirements, you may need to choose a mirror-polished head.

Cost considerations:

The higher the polishing grade, the higher the cost.

 

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