Classification of thin walled pipes of thin walled pipes, specifications of thin walled steel pipes

Seamless steel pipes are divided into two types: hot-rolled and cold-rolled (dialed) seamless steel pipes.

Hot-rolled seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.

In addition to general steel pipes, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes and other steel pipes, cold-rolled seamless steel pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless steel thin-walled steel pipes, and special-shaped steel pipes. The outer diameter of the hot-rolled seamless pipe is generally greater than 32mm, the wall thickness, the diameter of the cold-rolled seamless steel pipe can be up to 6mm, the wall thickness can be reached, the outer diameter of the thin-walled pipe can be up to 5mm, the wall thickness is less than, and the cold-rolled has higher dimensional accuracy than hot-rolled. Seamless tubes for furnaces, heat exchangers and pipes in petroleum refineries.

It is commonly used to make high-quality carbon steel), alloy steel (12CrMo, 15CrMo), heat-resistant steel (12Cr2Mo, 15Cr5Mo), and stainless steel (1Cr18Ni Cr18Ni9Ti). In addition to the chemical composition and various mechanical properties of the steel pipe, it is also necessary to ensure the water pressure, flattening, flaring and other tests, as well as surface quality and non-destructive testing. The steel pipes are delivered in a heat-treated condition.

Stainless steel pipes: with a variety of stainless steel hot-rolled, cold-rolled stainless steel pipes, widely used in petroleum, chemical equipment pipelines and stainless steel structural parts for various purposes, in addition to ensuring the chemical composition and mechanical properties, all steel pipes used to withstand fluid pressure should be guaranteed to be qualified in hydraulic pressure. All kinds of special steel pipes should be guaranteed according to the regulations.

The ratio of the outer diameter of the steel pipe to the wall thickness is greater than 20 is called a thin-walled steel pipe. Thin-walled steel pipesThin-walled steel pipes are made by cold drawing. Among them, carbon steel, low-alloy steel and alloy steel thin-walled pipes are suitable for general structures and mechanical structural parts; Thin-walled fluid steel pipes are used to transport general fluids; Stainless steel thin-walled pipes are used in heat-resistant containers, transportation pipelines and mechanical structural parts in chemical, petroleum, light industry, food, machinery and instrumentation and other industries.

The specifications of thin-walled steel pipes range from 4 minutes to 4 inches, and the specific specifications are as follows:

Outer diameter 21mm wall thickness.

Outer diameter 26mm wall thickness.

Inch. Outer diameter 32mm wall thickness.

2 inch outer diameter 21mm wall thickness.

5 inch outer diameter 21mm wall thickness.

Inch outer diameter 60mm wall thickness.

5 inch outer diameter 76mm wall thickness.

Inch outer diameter 89mm wall thickness.

Inch outer diameter 114mm wall thickness.

Thin-walled stainless steel pipe celery companion uses:The thin-walled stainless steel surface is as bright as a mirror, silver shining, especially suitable for kitchen and bathroom water pipes when the old house is renovated, there is no need to knock on the wall to remove the old water pipe, just put the thin-walled stainless steel water pipe on the surface of the wall, not only beautiful and luxurious, but also use the water pipe as a shower curtain rod and towel rack.

The high strength of thin-walled stainless steel water pipes greatly reduces the possibility of water leakage affected by external forces, significantly reduces the leakage rate of water, and enables water resources to be effectively protected and utilized.

Explanation of the tube wall [tube well].

The wall of the well is made of steel pipes.

Word decomposition Explanation of pipe pipe ǎ Instrument for blowing: Wind instrument. Orchestra.

Round, elongated, hollow thing : pipes. Pipeline.

Guan Jian (humility, shallow bureaucratic insight). Tube peeping and measuring the mu (looking at the sky from the bamboo pipe, measuring the sea water with a scoop, metaphorically narrow vision, short-sightedness). Not seeing the big picture.

Trachea. Blood vessels. Needle.

A two-pronged approach. Shape Explanation of the wall Tong Chai wall ì Wall: four walls.

Poster. Mural. Wall.

Tapestry. Closet. Wall.

Impregnable. Refers to the superficial layer inside certain objects: the stomach wall.

Intestinal. Steep cliffs: cliffs.

Standing on the wall. The walls of the barracks: the ramparts.

Fortified Clear. Watching from the sidelines (sitting and watching the success or failure of both sides, not helping either side).

The production process of large-diameter thick-walled seamless steel pipes can be divided into three basic methods, cold drawing, cold rolling and hot rolling. According to the use, it is divided into structural seamless steel pipe; seamless steel pipes for transportation; seamless steel tubes for boilers; high-pressure seamless steel pipes for boilers; high-pressure seamless steel pipes for fertilizer equipment; seamless steel pipe for geological brick exploration; seamless steel pipe for oil brick exploration, seamless steel pipe for oil cracking; seamless steel pipes for ships; cold-drawn cold-rolled precision seamless steel pipes; Various alloy tubes. Let's take a look at the classification and structure of large-diameter thick-walled seamless steel pipes.

According to the use, the root hall is divided into seamless steel pipes for structures; seamless steel pipes for transportation; seamless steel tubes for boilers; high-pressure seamless steel pipes for boilers; high-pressure seamless steel pipes for fertilizer equipment; seamless steel pipe for geological brick exploration; seamless steel pipe for oil brick exploration, seamless steel pipe for oil cracking; seamless steel pipes for ships; cold-drawn cold-rolled precision seamless steel pipes; Various alloy tubes. Seamless steel pipes are characterized by outer diameter, wall thickness, and wall thickness.

Seamless steel pipes are mainly used for machining, coal mining, hydraulic steel and other purposes. Hot-rolled thick-walled lead-free seam steel pipes, cold-rolled thick-walled seamless steel pipes, cold-drawn thick-walled seamless steel pipes, extruded thick-walled seamless steel pipes and pipe jacking, seamless stainless steel pipes for structure are seamless steel pipes for general structure and mechanical structure, which are widely used in corrosion-resistant pipes and structural parts of hot-rolled and cold-drawn seamless steel pipes made of stainless steel in chemical, petroleum, textile, medical, food, machinery and other industries.

Special-shaped seamless steel pipe is a general term for seamless steel pipes with cross-sectional shapes other than round pipes. According to the different shapes and sizes of steel pipes, they can be divided into special-shaped seamless steel pipes with equal wall thickness, special-shaped seamless steel pipes with unequal wall thickness and special-shaped seamless steel pipes with variable diameter. Special-shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts.

Compared with round pipes, special-shaped pipes generally have greater moment of inertia and cross-sectional modulus, and greater bending and torsion resistance, which can greatly reduce the weight of the structure and save steel. The general production process of seamless steel pipes can be divided into cold drawing and hot rolling. The production process of cold-rolled seamless steel pipes is generally more complex than that of hot-rolled.

The tube blank is rolled with three rolls, extruded and then subjected to a sizing test. If there are no reactive cracks on the surface, the round tube is cut into a blank of about one meter with a cutting machine.

If there are a lot of bubbles, the quality of the steel pipe is not up to the response standard. Cold-rolled seamless steel pipes are shorter in appearance than hot-rolled seamless steel pipes. The wall thickness of cold-rolled seamless steel pipe is generally smaller than that of hot-rolled seamless steel pipe, but the surface looks brighter than thick-walled seamless steel pipe, and there is not much roughness and burrs in the diameter.

The delivery status of hot-rolled seamless steel pipe is generally hot-rolled, and it is delivered after heat treatment. The hot-rolled seamless steel pipe should be strictly selected by the staff after the quality inspection, and the surface should be oiled after the quality inspection, and then the cold drawing test should be carried out for many times, and the perforation test should be carried out after the hot-rolled treatment. If the diameter of the piercing is too large, it should be straightened and corrected.

After straightening, it is transported by conveyor to the flaw detector for flaw detection experiment, and finally labeled and put into the warehouse.

Commonly used thick-walled seamless steel pipe implementation standards: Thick-walled seamless steel and rock pipe are classified by material The material of steel pipe is 10 It is called ordinary steel pipe and alloy steel pipe. The production and manufacturing process of thick-walled seamless steel pipe production can be divided into four basic ways: cold drawing, cold rolling, hot rolling, and hot expansion, and the material of the steel pipe is 10 called ordinary steel pipes, which are divided into seamless steel pipes for structures according to their uses; steel pipe without shed seam for transportation; seamless steel tubes for boilers; high-pressure seamless steel pipes for boilers; high-pressure seamless steel pipes for fertilizer equipment; Seamless steel pipes for geological brick exploration; seamless steel pipe for petroleum brick exploration; seamless steel pipes for petroleum cracking; seamless steel pipes for ships; cold-drawn cold-rolled precision seamless steel pipes; Various alloy tubes.

The expression method of seamless steel pipe is outer diameter, wall thickness, and thick-walled seamless steel pipe is mainly used for mechanical sailing, coal mining, hydraulic steel, and other purposes.

Seamless steel pipes are divided into hot-rolled and hot-expanded.

Hot-rolled seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.

There are three classifications in total, the first is PVC pipes, the second is corrugated steel pipes, and the third is plastic pipes.