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pipe technical requirements and methods manufacturing

Tube technical requirements and methods of manufacturing

Appointment and the chemical composition of steel

Steel pipe, steel fabrication with 10,20,35,45, and chemical composition should be consistent with the provisions of GB / T 699. Acceptance of steel pipe by the melting of components.

When the requirements of the demand side for the analysis of the products, should be specified in the contract. You must complete endurance chemical composition of steel to comply with the provisions of GB / T 222.

Accordance with the requirements of the demand side, supply and demand sides of consultation available to other brands of high quality structural carbon steel, alloy structural steel, and steel pipes.

Methods of manufacture

Steel smelting method chosen by the manufacturer.

It should be round tube be consistent with the provisions of YB / T 5222.

Rolled in the manufacture of cold drawn steel pipes or cold. Are selected only one way to manufacture and steel pipe should be identified in the contract.

High quality steel pipes and tubes, high quality steel

GB/T699-1999 and GB/T3077-1999 standard grades behind the letter "A" which, to the heart of high quality, on the contrary of high quality steel in general.

High quality steel in the next part or all of the superior quality of steel:

Composition and content of a narrow range;

(B), to reduce the harmful elements (such as sulfur, copper and phosphorus) content;

C to ensure high purity (non-metallic inclusion content less);

D, to ensure high mechanical and technological properties.

⑥ and vertical and horizontal

And longitudinal standard means parallel to the direction of the formation (ie, along the direction of treatment) who said; perpendicular to the horizontal direction to form (the direction of the machining of steel central tube).

Do influence the experience of energy, and a sample of the longitudinal fracture surface perpendicular to the direction of machining. He said that in an occasional break in the samples in parallel with the direction of treatment, linear fracture, and fracture-called accidental.

(2) the form of steel pipe, size, where

① nominal size and actual size

A Size: The size specified in the nominal scale, users and producers want to get the ideal size, as specified in the contract demand.

(B), the actual size: the actual size of the production process, and the size is often greater than or less than the nominal size. This is greater than or less than the nominal size of the phenomenon called the deviation.

② deviation and tolerance

He said the size requirements that are often greater than or less than the nominal size, and therefore the standard set forth in the actual size and nominal size of the difference in the production process, due to the actual size of the difficult access to the public: the deviation. The difference is positive is called a positive deviation, the difference is negative is called a negative deviation.

B tolerance: the standard set forth in the positive and negative deviation from the absolute values is called tolerance, also called "zone of tolerance."

The direction of deviation, this is a "positive" or "negative", tolerance is non-directional, and therefore, the so-called deviation is called "tolerance" or "negative tolerance".

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