How to classify pipes? What are the classifications of steel pipe materials?

Pipe. Pipes are the materials used to make pipe fittings. Different pipe fittings should use different pipes, and the quality of pipes directly determines the quality of pipe fittings.

This kind of pipe is mostly used in construction projects, power plants, chemical plants, etc., including GB5310, which is used for high-pressure boilers: GB T8163, seamless steel pipes for transporting fluids: GB3087, and seamless steel pipes for low-pressure boilers

GB T9948, seamless steel pipe for petroleum cracking: GB T14976, stainless steel seamless steel pipe for fluid transportation, common materials are alloy (15CrMo, 12Cr1MoV) carbon steel (10) stainless steel).

Including: PPR pipe, PVC pipe, UPVC pipe, copper pipe, steel pipe, fiber pipe, composite pipe, galvanized pipe, hose, reducer, water pipe.

Classification of pipes.

1. Classified according to production methods.

1) Seamless pipe - hot-rolled pipe, cold-rolled pipe, cold-drawn pipe, extruded pipe, pipe jacking (2) Welded pipe (a) according to the process - arc welded pipe, resistance welded pipe (high frequency, low frequency), gas welded pipe, furnace welded pipe (b) according to the weld - longitudinal welded pipe, spiral welded pipe.

2. Classification according to the shape of the section.

1) Simple cross-section steel pipe - round steel pipe, square steel pipe, oval steel pipe, triangular steel pipe, hexagonal steel pipe, diamond-shaped steel pipe, octagonal steel pipe, semi-circular steel circle, other (2) complex cross-section steel pipe - unequal hexagonal steel pipe, five-petal plum blossom-shaped steel pipe, double-convex steel pipe, double concave steel pipe, melon seed-shaped steel pipe, conical steel pipe, corrugated steel pipe, case steel pipe, and others.

3. Classification according to wall thickness - thin-walled steel pipes, thick-walled steel pipes.

4. Classification by use - steel pipes for pipelines, steel pipes for thermal equipment, steel pipes for machinery industry, steel pipes for petroleum and geological drilling, container steel pipes, steel pipes for chemical industry, steel pipes for special purposes, and others.

Wanguan Guanghui plastic products **** hope to help you.

Material: stainless steel, zinc steel, aluminum alloy, plastic.

Steel pipes can be divided into carbon pipes, alloy pipes, stainless steel pipes, etc. according to the material of pipe making (i.e. steel type).

Carbon pipes can be divided into ordinary carbon steel pipes and high-quality carbon structural pipes.

Alloy pipes can be divided into: low-alloy pipes, alloy structural pipes, high-alloy pipes, and high-strength pipes. Bearing tubes, heat-resistant and acid-resistant stainless tubes, precision alloy (such as Kovar) tubes and high-temperature alloy tubes.

Steel pipes are seamlessly divided into:

Seamless steel pipe. Ordinary carbon steel (10 steel, 20 steel, 45 steel, etc.) and alloy steel (16Mn, 12CrMo, 15CrMo) stainless steel, etc.

Seamed steel pipe (spiral seam and straight seam, common materials are: Q235A, B, C,

Steel pipes can be divided into multiple classifications according to their use, and the following are several common classifications:

1.Structural pipes: used in building structures, bridges, supports and other fields. Common structural pipes include square pipes, round pipes, rectangular pipes, etc.

2.Fluid transport pipes: piping systems used to transport liquids, gases or solid particles, including water pipes, oil pipes, natural gas pipes, etc.

3.Oil casing: used as a pipe for the well bore in oil and gas exploitation, with the characteristics of high pressure resistance and corrosion resistance.

4.Chemical pipelines: The dust of the transportation pipelines used in the chemical process is slow, and it needs to have the properties of corrosion resistance and high temperature resistance.

5.Boiler tubes: used to make large drafts of boilers, heat exchangers and other equipment, to withstand high temperature and high pressure.

6.Structural hollow tubes: common applications include tower cranes, cable trays and other fields, which have the characteristics of light weight and high strength.

7.Stainless steel pipes: used in occasions that require high corrosion resistance, such as food processing, chemical industry, medical equipment, etc.

8.Square tube: Widely used in construction, furniture manufacturing, vehicle manufacturing and other fields, easy to connect and install.

It is necessary to select the appropriate steel pipe classification and specification according to the specific project needs and usage scenarios.

Hot-dip galvanized pipe, in order to improve the corrosion resistance of steel pipes, galvanized general steel pipes. Galvanized steel pipes are divided into hot-dip galvanizing and electro-galvanizing, hot-dip galvanizing has a thick galvanized layer, low electro-galvanizing cost, and the surface is not very smooth.

Nominal rotten swimming closed wall thickness: mm5；

Coefficient: c028。

The mechanical properties of steel are an important indicator to ensure the end-use performance (mechanical properties) of steel, which depends on the chemical composition of the steel and the heat treatment regime. In the steel pipe standard, according to different use requirements, the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness indexes, as well as the high and low temperature properties required by users are specified. Grade of galvanized pipe steel:

q215a；q215b；q235a；q235b。

Test pressure value MPa: 3MPa; 5MPa.

Galvanized steel pipes are divided into cold galvanized pipes and hot-dip galvanized pipes, the former has been banned, and the latter has been advocated by the state to be usable.

1. Grinding uniformity of galvanized layer: the steel pipe sample shall not turn red when continuously impregnated in copper sulfate solution for 5 times (copper plating color).

2. Surface quality: The surface of the galvanized steel pipe should have a complete galvanized layer, and there should be no black spots and bubbles that have not been plated, and small rough surfaces and local zinc tumors are allowed.

3. Weight of galvanized layer: According to the requirements of the buyer, the galvanized steel pipe can be used to determine the weight of the zinc layer, and its average value should not be less than 500g square meters, of which any sample shall not be less than 480g square meters.

Cold galvanized galvanized pipe: cold galvanized is electrogalvanized, the amount of galvanization is very small, only 10-50g m2, and its corrosion resistance is much different from that of hot-dip galvanized pipe. In order to ensure the quality, most of the regular galvanized pipe manufacturers do not use electrogalvanizing (cold plating).

The pipes used for water supply are mainly cast iron locust and pipes. The outdoor is mainly used for sand molded cast iron pipes, and the indoor is used for galvanized cast iron pipes, which can be divided into cold (electro) galvanizing and hot-dip galvanizing. China has stipulated that from June 1, 2000, Taoming Jingtai sand mold casting pipe fittings and cold-dip galvanized cast iron pipes, gradually restrict the use of hot-dip cast iron pipes, and promote the use of aluminum-plastic composite pipes, plastic pipes, etc.

The third category is plastic pipes, such as PP-R (cross-linked polypropylene high-density mesh engineering plastics

1. Classified according to production methods.

1) Seamless pipes - hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, pipe jacking.

2) Welded pipes. a) According to the process - arc welded pipe, resistance welded pipe (high frequency, low frequency), gas welded pipe, furnace welded pipe.

b) According to the weld - straight seam welded pipe, spiral welded pipe.

2. Classification according to the shape of the section.

1) Simple cross-section steel pipes - round steel pipes, square steel pipes, oval steel pipes, triangular steel pipes, hexagonal steel pipes, diamond-shaped steel pipes, octagonal steel pipes, semi-circular steel circles, and others.

2) Complex cross-section steel pipes - unequal hexagonal steel pipes, five-petal plum blossom shaped steel pipes, double-convex steel pipes, double-concave steel pipes, melon-shaped steel pipes, conical steel pipes, corrugated steel pipes, case steel pipes, and others.

3. Classification according to wall thickness - thin-walled steel pipes, thick-walled steel pipes.

4. Classification according to use - steel pipes for pipelines, steel pipes for thermal equipment, steel pipes for machinery industry, steel pipes for petroleum and geological drilling, container steel pipes, steel pipes for chemical industry, and steel pipes for special purposes.